JP2722138B2 - Compression device in packaging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in the technical field of packing equipment, and more particularly to a compression device in a packing machine.

[0002]

2. Description of the Related Art Packaging machines for handling articles to be packaged such as newspapers are:
A compression device is provided for compacting the packages stacked in a free state.

[0003] In this compression apparatus, usually, a compression conveyor or a compression flat plate is driven up and down by a lifting mechanism such as a cylinder to compress an object to be packed from a free stacking height to a height suitable for a packaging process. I have.

[0004]

However, the compression device using a lifting mechanism such as a cylinder has a simple structure and can hold down the packaged object with a constant force, but the packaged product has a predetermined compression height. To know if
For example, even if an attempt is made to speed up the compression work by detecting the compression force of the compression conveyor and confirming the completion of compression, the lifting mechanism, such as a cylinder, requires a slight change in the lowering speed and lowering height of the compression conveyor. There was a problem that could not be detected.

According to the present invention, in view of such conventional circumstances, the compression force can be set to a desired strength, and the completion of compression can be accurately detected when the compression force reaches a set value. An object of the present invention is to provide a compression device in a packaging machine.

[0006]

SUMMARY OF THE INVENTION A compression device in a packaging machine according to the present invention is characterized in that a plurality of packages are compressed from a free height to a packaging height by a compression conveyor comprising an upper conveyor and a lower conveyor. In the packaging machine, a compression device is provided on the upper conveyor, and the compression device is mainly composed of a rotating machine such as a servomotor connected to an elevating mechanism of the upper conveyor, and a servo amplifier and the like connected to the rotating machine. A controller, a current limit detector connected to the main controller, a compression force adjuster connected to the main controller, the compression force of which can be adjusted by setting a current limit value, and a rotating machine. A central processing unit for processing the position signal of the upper conveyor into a current limit command signal and processing the current limit value detection signal by the current limit detector into a speed command signal. It is.

[0007]

The upper conveyor descends at a predetermined speed until the object to be packaged approaches the packaging height from the free height.

Thereafter, when the upper conveyor reaches the packaging height, the compressive force in this case is detected as an electric signal, and this electric signal is processed by the central processing unit, and the rotating machine is stopped, so that the article to be packaged is The completion of the compression is immediately confirmed.

[0009]

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

In a compression apparatus 1 shown in FIG. 1, a plurality of packages W to be packed are formed by a compression conveyor 4 composed of an upper conveyor 2 and a lower conveyor 3 of a packaging machine (not shown).
To compress from the free height H to the packaging height L
This is provided on the upper conveyor 2.

That is, the compression device 1 includes a servomotor or the like connected to the lifting mechanism 5 of the upper conveyor 2, a rotating machine 6,
A main controller 7 such as a servo amplifier connected to the rotating machine 6
A current limit detector K connected to the main controller 7,
A compression force adjuster R, which is connected to the main controller 7 and whose compression force can be adjusted by setting a current limit value, and a position signal A of the upper conveyor 2 by the rotating machine 6 is processed into a current limit command signal B. And a central processing unit 8 for processing the current limit value detection signal C by the current limit detector K into the speed command signal D. The upper conveyor 2
Endless belt 2b is attached to pulley 2a (drive side is the front side)
And is held by the lifting beam 9 via a frame (not shown).

The lower conveyor 3 includes a pair of pulleys 3a.
An endless belt 3b is stretched over the front (drive side) and fixed on the floor via a frame (not shown),
The article to be packaged W is compressed by the lower conveyor 3 and the upper conveyor 2, and is sent to the next process (packing process) in the compressed state.

The elevating mechanism 5 performs a compression process on the article to be packaged W by moving the upper conveyor 2 up and down with respect to the lower conveyor 3, and the elevating mechanism 5 is connected to both ends of the elevating beam 9. A pair of transmission means 10 and 11, an intermediate shaft 12 connected to the input side (lower side) of each of the elevation transmission means 10 and 11, and an input side transmission means 13 connected to the intermediate shaft 12. And a beam guide 14. The elevating transmission means 10 has an endless belt 10b wound around a pair of pulleys 10a, and the elevating transmission means 11 has an endless belt 11b wound around a pair of pulleys 11a. The input-side transmission means 13 includes a sheave 12 a provided on the intermediate shaft 12, a sheave 6 a of the rotating machine 6, and a belt 15 wrapped around both.

The main controller 7 is connected to a compression force regulator R (see FIG. 2). The compression force adjuster R is for setting the compression force applied to the packaged item W to an appropriate strength. For example, at least one variable resistor is applied, and a current limiter corresponding to a desired compression force is applied. The value is adjustable. In other words, when the upper conveyor 2 pushes the article W down to a predetermined packaging height L (for example, 300 mm or less), a current limit value flowing through the rotating machine 6 is set and the lowering operation of the upper conveyor 2 is stopped. It was done as such.

That is, when the elevating mechanism 5 is driven by the start command signal of the main controller 7, the elevating operation of the upper conveyor 2 is fed back to the central processing unit 8 as the position signal A by the rotating machine 6, and this position signal A , A current limit command signal B of the central processing unit 8 is input to the main controller 7. Thereafter, the current limit value set by the compression force regulator R is changed to the main controller 7.
Is detected by the current limit detector K, the current limit value detection signal C is processed by the central processing unit 8, and is input to the rotating machine 6 through the main controller 7 as the speed command signal D. The upper conveyor 2 is stopped.

Next, the operation of the above embodiment will be described.

In the central processing unit 8, an output operation of a current limit command signal B based on the position signal A and an output operation of a speed command signal D based on the current limit value detection signal C are stored in advance.

First, when a start command signal of the main controller 7 is input to the rotating machine 6, the rotating operation of the rotating machine 6 is controlled by the lifting mechanism 5
Is converted to a lowering operation of the upper conveyor 2 via At this time, since the rotating machine 6 does not receive the current control command signal B, the upper conveyor 2 descends at a predetermined speed without stopping even if a large starting current flows through the rotating machine 6. When the upper conveyor 2 comes into contact with the package W and descends to a position near the position where the package W is compressed to the packaging height L, the position signal A is processed by the central processing unit 8 and the current limit command signal B
Is input to the main controller 7.

Thereafter, when the lowering operation of the upper conveyor 2 is continued and the current value flowing through the rotating machine 6 increases as the package W is compressed, the current value is reduced by the compression force regulator R.
, The current limit value detection signal C detected by the current limit detector K of the main controller 7 is processed by the central processing unit 8, and the speed command signal D
Is input to the main controller 7, the rotating machine 6 stops, and the completion of the compression operation of the upper conveyor 2 is confirmed.

[0020]

The compression device in the packaging machine of the present invention is
The upper conveyor of the packaging machine for compressing the articles to be packaged is connected to the rotating machine via the elevating mechanism, and the central processing unit is linked to the rotating machine and the main controller connected to the rotating machine. Since the completion of the compression of the package can be accurately and promptly detected by the current limit value detection signal, the speed of the compression operation can be increased.

The compressive force applied to the packaged object can be set to a proper value by adjusting the current limit value with the compressive force adjuster of the main controller, so that the equipment reliability can be improved. There are excellent advantages.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a compression device.

FIG. 2 is a circuit diagram illustrating a control operation of the compression device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Upper conveyor 3 Lower conveyor 4 Compression conveyor 5 Lifting mechanism 6 Rotary machine 7 Main controller 8 Central processing unit A Position signal B Current limit command signal C Current limit value detection signal D Speed command signal K Current limit detector H Free height L Packaging height W Packaged material

Claims (1)

(57) [Claims] 1. A packaging machine in which a large number of articles to be packed are compressed from a free height to a packaging height by a compression conveyor composed of an upper conveyor and a lower conveyor, wherein a compression device is provided on the upper conveyor. The compression device includes a rotating machine such as a servo motor connected to an elevating mechanism of an upper conveyor, a main controller such as a servo amplifier connected to the rotating machine, and a current limiting device connected to the main controller. A detector, a compression force regulator connected to the main controller and capable of adjusting the compression force by setting a current limit value, and processing the position signal of the upper conveyor by the rotating machine into a current limit command signal. And a central processing unit for processing a current limit value detection signal by a current limit detector into a speed command signal.