JP3033665B2 - Width warning device for metal strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting and alarming a drop in width of a strip caused by meandering of the strip when slitting or trimming the strip.

[0002]

2. Description of the Related Art When slitting or trimming a metal strip (including a plate or a foil), the metal strip 1 is moved in the direction of an arrow by a roller or the like (not shown) as shown in FIG. The metal strip is cut by cutters 2 provided at both ends in the width direction of the metal strip, and is separated into a metal strip and slitting waste 3 which are to be products. The product is wound up, and the slitting waste is suctioned by a vacuum suction method. It is stored in a duct (not shown) and treated as waste. However, during slitting, the metal strip 1 may sway in the width direction due to meandering or the like. There is no problem while the run-out is small, but when the run-out increases, the metal strip 1 moves left or right as shown in FIG. The end portion of the metal strip may be a product without slitting the portion which is originally trimmed as scrap, that is, up to the width drop portion 12. If this is shipped as it is, it will cause a complaint problem, so it is necessary to establish a reliable width drop detection technology.

As a method of detecting the width drop, there is a method of directly measuring the width of a product by using, for example, a laser outer diameter measuring device. However, this measuring instrument is expensive, and there is a problem that the measurement cannot be performed accurately because the runout of the metal strip directly affects the measuring accuracy.

[0004]

SUMMARY OF THE INVENTION As a result of studying the above problems, the present invention can easily reduce the width drop of a product caused by the deflection of a metal strip due to meandering or the like when slitting or trimming the metal strip. In addition, a device capable of detecting and alarming with high accuracy has been developed.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a metal strip material width drop alarm device which includes a metal strip 1 to be slitted or trimmed and a slitting or trimming metal strip 1. An electric circuit including conductive contacts 4 and 4 respectively contacting trimming debris 3 and 3 generated at both ends in the width direction of the metal strip 1 is provided, and a timer 8 is activated when the electric circuit is opened.
And a buzzer 9 that operates after a predetermined time has elapsed from the start of the operation of the timer 8.

[0006]

According to the width drop alarm device of the present invention, in the process of slitting or trimming, if the moving metal strip 1 does not meander, etc. and the movement is normal, both sides of the metal strip 1 are used. Each of the trimming scraps 3 is generated, so that an electric circuit including the moving metal strip 1, the trimming scraps 3 on both sides thereof, and the contacts 4 contacting the trimming scraps is formed. It detects that it is closed and there is no drop, and no alarm is given by the buzzer 9. On the other hand, when meandering or the like occurs in the metal strip 1, trimming debris 3 on one side of the metal strip 1 disappears, and one contact 4 and the metal strip 1 become non-conductive, and an electric circuit is formed. open. As described above, the timer 8 operates at the same time when the electric circuit is opened, and when the timer 8 measures a predetermined time, the buzzer 9 is operated as a width drop detection. If the predetermined time measured by the timer 8 is set to a short time, the trimming debris 3 may separate from the contact 4 and generate an alarm due to vibration or the like even in a normal state. Good to do.

As described above, since the device of the present invention has a very simple structure, there is no trouble such as failure, and even if the trimming dust 3 and the contact 4 are momentarily brought into a non-contact state due to vibration or the like. Since it does not work, the width drop of the metal strip product is accurately detected and alarmed. As the material of the contact is always rubbed with the trimming waste, it is preferably a conductive and wear-resistant metal material, and the shape of the contact is a rod-like or ring-like shape so that the trimming waste does not come off. Is better. In addition, as a method of treating the waste by pulling the trimming waste by suction, a conventionally used bacium suction system can be applied.
What is necessary is just to pull the trimming waste. Further, the present apparatus can be applied to slitting of metals such as aluminum, copper, and iron, and other conductive materials.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view schematically showing an apparatus for detecting width drop of a metal strip according to one embodiment of the present invention. In the drawing, reference numeral 1 denotes a metal strip, and cutters 2 for cutting are provided at both ends in the width direction of the metal strip, and rollers (not shown) are provided.
For example, both ends of the metal strip moving in the direction of the arrow are cut off. Trimming waste 3 generated by cutting
And two conductive contacts 4 are provided so as to make contact with the amplifier 7, and these contacts 4, 4 communicate with the amplifier 7 via the electric conductor 5 and the electric wire 6, respectively. As described above, the electric circuit including the moving metal strip 1, the contact 4 and the amplifier 7 is closed by the contact between each trimming waste 3 and the corresponding contact 4, and the amplifier 7 is Is provided with a timer 8 and a buzzer 9. The electric conductor 5 is attached to a slitter (not shown) by a bracket 11 via an insulating plate 10. Below the trimming waste 3, a vacuum suction type waste treatment machine 13 is provided to suck the trimming waste 3.

In this device having such a structure, in a normal state (see FIG. 4), two trimming chips 3 cut by the cutter 2 come into contact with the contact 4 as shown in FIGS. There is conduction between the amplifiers 7 via the metal strip 1. On the other hand, when deflection occurs in the metal strip 1 during cutting, a width drop portion 12 is generated as shown in FIG. 5 described above, and the trimming debris 3 is eliminated as shown in FIG. There is no conduction between the amplifiers 7. In the case where conduction is lost, a buzzer is activated and an alarm is issued when a predetermined time set by a timer is exceeded, so that occurrence of a width drop is reliably detected and alarmed.

The above-mentioned contact may be formed by joining an electric conductor 5 to a rod-like contact 4 as shown in FIGS. 6 and 7, or a contact 4 as shown in FIGS. To which an electric conductor 5 is joined. Further, the above-described electric conductor 5 may be provided with both ends.

[0011]

According to the apparatus for alarming a drop in the width of a metal strip according to the present invention, it is possible to accurately detect a drop in the width of a metal strip and issue an alarm with a simple configuration, which is a remarkable industrial advantage. Is played.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an apparatus for detecting a drop in width of a metal strip according to an embodiment of the present invention.

FIG. 2 is a schematic view showing a state where there is conduction of trimming waste according to an embodiment of the present invention.

FIG. 3 is a schematic diagram showing a state where there is no conduction of trimming waste according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a normal trimming state of a metal strip.

FIG. 5 is a perspective view showing a state where a width drop of a metal strip occurs.

FIG. 6 is a plan view showing an example of a contact according to an embodiment of the present invention.

FIG. 7 is a side view of the contact of FIG. 6;

FIG. 8 is a plan view showing another example of the contact according to the embodiment of the present invention.

FIG. 9 is a side view of the contact of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal strip 2 Cutter 3 Trimming waste 4 Contact 5 Electric conductor 6 Electric wire 7 Amplifier 8 Timer 9 Buzzer 10 Insulator 11 Bracket 12 Width drop part 13 Waste treatment machine

Continuation of the front page (56) References JP-A-61-61708 (JP, A) JP-A-5-228723 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23D 33 / 00 B23D 19/06

Claims (1)

(57) [Claims] 1. A metal strip 1 to be slitted or trimmed, and trimming debris 3 generated at both ends in the width direction of the metal strip 1 during slitting or trimming.
An electrical circuit including conductive contacts 4 and 4 that respectively contact the electrical circuit 3; a timer 8 that operates when the electrical circuit is opened; and a buzzer 9 that operates after a predetermined time has elapsed from the start of operation of the timer 8. A width drop alarm device for metal strips, characterized by comprising: