JPS63191707A - Packer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus for wrapping an object in a wound form using a stretched film made of various materials.

<Prior Art> As a measure to prevent cargo from collapsing during pallet transportation, there has been conventionally known a method of wrapping an object with a stretched film of polyethylene, polypropylene, or the like.

This packaging method generally involves wrapping the packaged item placed on a rotatable turntable with a film drawn from a roll of film placed adjacent to it. It is desirable that the film to be wound be in a sufficiently stretched state so that the amount of film can be as small as possible. The first step as a means to bring about this state is to incorporate a brake into the storage shaft of the film set in roll form, and with the brake applied to the film, the film is wrapped around the item to be packaged. Measures were taken to stretch the However, when using this method, if you try to stretch the film with too strong a force, it will immediately hit the packaged object, causing the tube part to deform during wrapping, or even cause the film to stretch in the width direction. phenomenon(
If the film cannot be stretched to a state where it has sufficient strength due to neck-down, etc., and the object to be wrapped is an angular object, the stretching force of the film is equal to the corner angle of the object. The amount of stretching reaches a maximum at 50%, which poses problems such as not only not being able to give a uniform amount of stretching to the film, but also causing the film to be cut. Therefore, a technique has been proposed in which the film is stretched in advance and then packaged, an example of which is the technique shown in Japanese Patent Publication No. 40682/1982. Instead of stretching the film at the time it is wrapped around the packaged item, two rollers are placed adjacent to the unwinding device where the rolled film is installed, and the two rollers are used to stretch the film. Although the problem of the above-mentioned first step method has been solved by the technique of pre-stretching,
However, there are some points that need improvement. That is, this special public service 1986-406
In the technique of Publication No. 82, since the two rollers are mechanically connected, the operation when trying to change the rotational speed of these two rollers is complicated, and furthermore, the rotation speed of the two rollers is not continuous. 17 cannot be obtained, the structure of the device itself is complicated, and failures are common.

<Problems to be Solved by the Invention> The present invention solves the problems still remaining in the technique disclosed in Japanese Patent Publication No. 59-40682, has a simple structure, has few failures, and has a film that can be stretched in any desired manner. The purpose of this invention is to provide a packaging device that can reduce packaging costs.

<Means for solving the problems> The above object of the present invention can be achieved by adopting the following means. That is, in an apparatus for wrapping an object to be packaged, which is arranged at a short distance from the roll-shaped stretchable film, in a roll-like manner, the roll-shaped film is arranged so as to be rotatable. a primary roll spaced adjacent to the unwinding shaft; a secondary roll spaced adjacent to the same primary roll; the secondary roll is connected to the motor via a second tension brake; A first tension brake is connected to the roll, and the braking forces of the first and second tension brakes are adjusted respectively so that the minimum torque value required to rotate the primary roll is the minimum torque value required to rotate the secondary roll. The torque value is set to be greater than the torque value, and the film pulled out from the roll-shaped film is passed from the primary roll to the secondary roll, and the pulled out film is wound from the tip to the above-mentioned object to be packaged. This is a packaging device that

In the device of the present invention, there are no restrictions on the way the film is applied to the primary roll and the secondary roll, and these rolls may rotate in the same direction or in opposite directions. etc. may be determined as appropriate depending on the positional relationship between the roll film and the turntable, etc., and guide rolls may be placed at key points as necessary to maintain the correct tension of the film.

<Function> In the apparatus of the present invention, as shown in FIG. 1, one end of the film a held in a roll is pulled out, and the film a In response to the movement of the turntable 5, the turntable 5 and the like are rotated to reach the part in front of the turntable 5 where the packaged object C is placed. The film a is then wrapped around the object C by rotating the object C and other members relative to each other. That is, in FIG. 1, film JL, primary roll (1).

The secondary roll (2) is fixed in this position and the turntable b is rotated, or the packaged object C is left stationary on the fixed table body. Either by rotating the next roll (2) around it. The present invention will be described in detail below using the former turntable b as an example. In Figure 1, the secondary roll (2) is connected to a motor (3) via a second tension brake (4), and this second tension brake (4) is of the type that incorporates an electromagnetic clutch. The electromagnetic clutch is engaged only when a torque exceeding a certain value (T) is applied to the secondary roll (2) through the film a, that is, the rotational force of the motor is applied to the secondary roll (2). ) is conveyed to the secondary roll (2)
If the torque value is less than 72, the electromagnetic clutch is in the disengaged state and the secondary roll (2
) shall not rotate. A first tension brake (5) is built into the primary roll (1), and the brake is released only when a torque of a certain value (referred to as T+) is applied to the primary roll (1) through the film a. The primary roll (1) is assumed to be rotatable. In the apparatus of the present invention having such a configuration, one end of the film a is pulled out and attached to the object to be packaged C by an appropriate means, and then the turntable b is rotated to sequentially wrap and package the film a. drive the motor (3), and
The values of I and T2 are set so that T+>Tz.

The drive of the motor (3) is transmitted to the second tension brake (4) through the required transmission mechanism, but the drive of the secondary roll (2
), the electromagnetic clutch built into the second tension brake (4) is idle and the secondary roll (2) does not rotate at all while no torque is applied or only a torque of less than 12 is applied to the second tension brake (4). In this case, the primary roll (1) does not rotate at all (the first tensile brake is in operation), and therefore, the film a is not unwound. Next, turntable b is rotated to apply tension to film a, which applies rotational torque to the primary roll (1) and secondary roll (2), and when the torque exceeds the Tz value, the secondary roll (2) The rotation starts, but while the torque is less than the TI value, the primary roll (1) cannot rotate yet, so the unwinding of the film a does not occur and the state in which the film a is stretched continues for a while, and as a result, the primary roll (1) 1) also becomes large, and when it exceeds T, the primary roll (1) and the secondary roll (
2) start rotating together, and each roll has a set value TljT
! The film continues to rotate at a speed regulated by the frictional resistance between the film a and each roll.

By the way, since the above-mentioned conditions are set such that TI>T2, the secondary roll (2) rotates at a higher speed than the primary roll (1), and the film a increases by the difference in circumferential speed between the two rolls. It is stretched and wrapped around the object C in the stretched state.

<Example> Examples of the present invention will be described in detail below with reference to FIGS. 2 to 4. FIG. 2 is a front view of the embodiment of the present invention, FIG. 3 is a plan view of the same, and FIG. 4 is an enlarged view of the main parts.

As shown in these drawings, a roll of film is placed on a mounting table (7) that is movable up and down along a support (6) that is placed opposite turntable b at a certain distance. Output shaft (8), primary roll (1), secondary roll (2)
A vertically movable arm (9) is also provided on the support column (6) so as to protrude in the direction of the turntable b, and below the tip of the arm (9) is a A rotatable top platen (10) is attached to stabilize the object C. In Figures 2 and 3, (11) is the motor for lifting and lowering the above-mentioned mounting table (7), (12) is the motor for lifting and lowering the arm (9), and (13) is the motor for rotating the turntable 5 times. be. Figure 4 shows the details of the primary roll (1) and secondary roll (2) mounted on the upper part of the mounting table (7). (8) is erected, and the roll-shaped film is placed on the unwinding shaft (8) in a completely freely rotatable state. A primary roll (1) is vertically installed in a state where it is spaced close to the unwinding shaft (8), and the primary roll (1) is rotatably supported by bearings at both upper and lower ends, and furthermore, the upper part of the primary roll (1) is rotatably supported by bearings. The first tension brake (5) is released when torque exceeding a certain value (T1) is applied.
is incorporated. Furthermore, a secondary roll (2) is vertically installed at a short distance from the same roll (1), and is rotatable. A pulley (14) provided at the upper end is connected to a motor (3) via a belt (15) via a Tensilon brake (4). And the second tension brake (4) applies a certain value (T2) to the secondary roll (2).
) A clutch is built in that operates when a torque of 12 or more is applied, and the secondary roll (2) is set so as not to rotate if the torque is less than 12. In this embodiment, a variable speed motor was used as the motor (3).

The function of each member in the above-described embodiment device is as described in the section of the function of the present invention.

Using this example device, it consists of an assembly of a plurality of small boxes placed on a turntable b, and 1200!1llIII
The packaged object C, which is 1000mm square and 1500n+m high, is wrapped in a spiral or cross-spiral shape using a film made of Nippon Petrochemical Co., Ltd.'s Nisseki Storage Film with a thickness of 25μm and a width of 350+am. We also conducted various packaging tests, such as in the form of a headband. Various tests were conducted with the stretching ratio of film a ranging from 50 to 300%. As a result, the setting value Tz of the second tension brake (4) changes the stretching ratio of the film a.
, and the set value T of the first tension brake (5) can be simply operated by electrically controlling the relative magnitude relationship between the set value T and the set value T of the first tension brake (5).
By appropriately changing T2, it was possible to wrap the film a stretched to the desired stretching weight around the packaged object C without causing any cylindrical surface warping or neck-down.

<Effects of the Invention> As described above, according to the apparatus of the present invention, the film a held in a roll is not stretched when it is wrapped around the object to be packaged C, but the film a is stretched in advance on the primary and secondary rolls. When stretching is possible due to the difference in rotational speed, and the primary and secondary rolls are not directly connected, and the torque applied through film a exceeds the release setting value of the tension brake gear built into each roll. Both rolls are configured to rotate for the first time, and their reset values can be changed significantly and freely by electrical control, so the stretching ratio of film a can be changed smoothly, and the structure is simple. This has the effect of reducing failures.

Furthermore, in the device of the present invention, since the rotation of the motor is transmitted to the secondary roll via the second tension brake with a built-in electromagnetic clutch, the motor used may be of a fixed rotation speed type (this will reduce costs accordingly). be.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram for explaining the operation of the device of the present invention;
Figures 3 and 3 are a front view and a plan view of the device according to the embodiment of the present invention,
FIG. 4 is an enlarged explanatory diagram of the main part. In the figure, (1) - Primary roll (2) Secondary roll (3) Motor (4): Second tension brake (5) / First tension brake a Film; Turnte 1 pull C: Packaging object patent Applicant Ryozo Matsumoto (1 other person) Agent Noriharu Ariyoshi Figure 4 Figure 1 Figure 1-. -7, Brake Figure 2 Package

Claims (1)

[Claims] 1. With a stretchable film arranged in a roll,
In an apparatus for wrapping an object placed a short distance away from the film, a primary roll, an identical roll, and the like are installed close to an unwinding shaft on which the rolled film is rotatably placed. a secondary roll spaced adjacent to the roll;
The secondary roll is connected to a motor via a second tension brake, and a first tension brake is connected to the primary roll, and the braking forces of the first and second tension brakes are adjusted respectively. The minimum torque value required to rotate the secondary roll is set to be greater than the minimum torque value required to rotate the secondary roll, and the film pulled out from the rolled film is passed from the primary roll to the secondary roll, and the pulled out film is passed from the primary roll to the secondary roll. A packaging device characterized in that the film is wound around the object to be packaged from the leading end of the film.