JPS6245768Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a leveler feeder in which a DC servo motor applies back tension to a coil material loaded in an uncoiler.

Conventionally, a coil line that supplies coil material to a press, shear, etc. has an uncoiler b that sequentially delivers coil material a, and a leveler that flattens the delivered coil material a and supplies it to the press, as shown in Figure 1. c is provided.

Further, a loop d is formed in the coil material a between the uncoiler b and the leveler c so that if there is a difference between the amount of feed from the uncoiler b and the amount supplied by the leveler c, this difference can be absorbed. However, in the conventional leveler feeder, because of the loop d of the coil material a,
Brake timing of uncoiler b is difficult,
The coil material a is often fed out from the uncoiler b more than necessary. For this reason, in the past, the coil line had to be stopped each time, the uncoiler b was reversed, and the coil material a that had been drawn out more than necessary was wound up, resulting in very poor work efficiency.

This invention was made to improve this problem, and provides a leveler feeder device that uses a DC servo motor to apply back tension to the coil material loaded in the uncoiler in accordance with changes in the outer diameter of the coil material. This makes it possible to supply coil material without forming a loop between the uncoiler and the leveler.

Below, this invention will be described in detail with reference to an embodiment shown in FIG. It becomes more. The uncoiler 2 consists of a drum 5 loaded with the coil material 4 to be supplied, and a DC servo motor 6 connected to the drum 5.The DC servo motor 6 is controlled as described later to supply the coil material 4. , so as to provide a back tension corresponding to the outer diameter of the coil material 4. Further, above the drum 5, a presser roll 8 is provided which presses against the outer circumference of the coil material 4. The base end of the presser roll 8 is supported by the tip of a coil opener 9 that is pivoted to the leveler 3 side, and the electric motor 10
The coil material 4 is rotated in the unwinding direction via the endless belt 11, and the unwinding end of the coil material 4 passes through the end bending roll 12 and the side guide roll 13 to the side of the pinch roll 14 of the leveler 3. is being supplied to. The leveler 3 is composed of a plurality of leveler roll groups 14 for straightening the winding curls in the coil material 4, and a feed roller 15 and a measuring roll 16 for feeding the coil material 4 straightened by the leveler roll group 18 to a press (not shown). has been done. Note that 17 is a side guide.

Thus, the coil material 4 loaded on the drum 5 of the uncoiler 2 is constantly given back tension by the DC servo motor 6. This back tension sets an appropriate initial torque in the DC servo motor 6 by controlling the field current according to the conditions of the coil material 4 used.

The relationship between the field current and torque of the DC servo motor 6 is shown in FIG. 4A, and the relationship between the field current and rotational speed is shown in FIG. 4B.

Next, the outer diameter of the coil material 4 loaded onto the drum 5 is detected by a detection means (not shown), and an initial torque corresponding to the outer diameter of the coil material 4 is stored in a control system (not shown). Thereafter, the coil material 4 is straightened by the leveler roll group 18 of the leveler 3, and is fed to a press or the like by the feed roll 15. However, since the necessary amount of the coil material 4 is pulled out from the uncoiler 2 by the feed roll 15,
No loop is formed between the uncoiler 2 and the leveler 3.

On the other hand, the DC servo motor 6 is controlled so that the field current decreases as the outer diameter of the coil material 4 decreases due to the supply of the coil material 4. That is, the torque of the DC servo motor 6 increases in proportion to the field current. (Refer to FIG. 4), the rotation speed becomes slower, so when the outer diameter of the coil material 4 is large, the rotation is slow and the torque becomes large, and as the outer diameter becomes smaller, the rotation becomes faster and the torque becomes smaller.
Therefore, even if the outer diameter of the coil changes, the feeding speed and back tension of the coil material 4 are controlled to be kept constant.

As described in detail above, this invention controls the field current of a DC servo motor so that an optimum back tension is always applied to the coil loaded in the uncoiler depending on the outer diameter of the coil, and Since the material is drawn out by a feed roll provided on the leveler side and supplied to a press, etc., only the required amount can be drawn out from the uncoiler, and there is no need to form a loop between the uncoiler and the leveler. As a result, the coil material is not unnecessarily drawn out when the uncoiler is braked, so there is no need to stop the line each time and wind up excess loops into the coil material 4, and the line can be operated. In addition, since no loops are required, the total length of the coil line can be shortened to approximately 70% or less compared to the conventional loop-formed coil line, resulting in a reduction in installation space.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a conventional leveler feeder, Figure 2
The figure is a plan view of a leveler feeder according to an embodiment of the invention, FIG. 3 is a side view of the same, and FIG. 4 is a diagram showing the relationship between field current and torque. 2 is an uncoiler, 3 is a leveler, 4 is a coil material,
6 is a DC servo motor, 14 is a pinch roll group,
15 is a feed roller, and 18 is a leveler roll group.

Claims (1)

[Scope of utility model registration request] An uncoiler 2 that applies almost constant back tension to the coil material 4 by a DC servo motor 6 whose field current is controlled according to changes in the outer diameter of the coil material 4 supplied to the coil line.
and a leveler 3 comprising a feed roller 15 for drawing out the coil material 4 from the uncoiler 2 and a leveler roll group 18 for straightening the coil material 4 drawn out by the feed roller 15.