JPH0649373Y2 - Plate thickness detection mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] In the present invention, a plate is sandwiched between a fixed first roller and a movable second roller, and the amount of movement of the second roller in the plate thickness direction is controlled. A mechanism for converting the amount of rotation and detecting this with a rotary encoder makes it possible to accurately and easily automatically measure the plate thickness, and to make the plate thickness detection mechanism easy for adjustment work.

[Industrial application field]

The present invention relates to a plate thickness detecting mechanism, and more particularly to a mechanism for detecting a plate thickness using a rotary encoder.

INDUSTRIAL APPLICABILITY The present invention can be used as a plate thickness detecting means in the case of selectively processing a sheet metal having various thicknesses by a sheet metal punching machine or the like.

[Conventional technology]

For example, in the case of pressing a sheet metal, the sheet metal of the material is unwound and conveyed to the press portion. However, if two sheets of material are fed due to unsuccessful unwinding or the sheet thickness is uneven, it may cause product defects or failure. Therefore, it is necessary to detect the plate thickness of the sheet metal before processing.

Therefore, as a means for detecting the plate thickness, conventionally, the plate thickness is measured by using a caliper or the like, or the plate thickness of the metal plate is measured by a magnetic sensor or the like.

[Problems to be solved by the invention]

Thus, the conventional plate thickness detecting means using a caliper or the like can accurately measure the plate thickness at the measurement point. However, in order to check defective products in which the plate thickness changes irregularly, continuous plate thickness measurement is required over the entire surface of the plate, which is difficult with the above means. Further, this means is inefficient because it is manually measured, and there is a problem that it cannot be applied to mechanization and automation of the manufacturing process.

Further, the plate thickness detection means using the magnetic sensor can automate the plate thickness measurement, but on the other hand, there is a problem that the sensor adjustment work is difficult and time-consuming.

The present invention has been made in view of such a point, and provides a plate thickness detection mechanism in which the plate thickness detection means can be easily adjusted, accurate and efficient measurement can be performed, and measurement can be automated. With the goal.

[Means for solving problems]

In order to achieve the above object, the plate thickness detecting mechanism of the present invention is, as shown in FIG. 1, a rotatable first roller 13 fixed at a position in contact with a lower surface 12 of a plate 11, and the first roller 13 A second rotatable roller 14 that moves up and down in a direction directly above the first roller 13 to sandwich the plate 11 between the second roller 14 and the second roller 14;
A conversion unit 15 for converting the up-and-down movement of the device into a rotary motion and a rotary encoder 16 for detecting the amount of rotation in the conversion unit 15 are provided.

The rotary encoder described above refers to one that converts the input rotation amount into a code such as a pulse and performs display.

[Action]

The plate thickness detecting mechanism of the present invention comprises a rotatable first roller 13 and a first roller 13 which are fixed at a position in contact with the lower surface 12 of the plate 11.
Plate 11 by means of a rotatable second roller 14 which moves up and down in the direction directly above the plate 11 and clamps the plate 11 with the first roller 13.
Since the amount of movement of the sheet in the thickness direction is measured, the sheet thickness can be accurately detected.

By using the conversion unit 15 that changes the vertical movement of the second roller 14 into a rotational motion and the rotary encoder 16 that detects the amount of rotation in the conversion unit 15, it is possible to easily adjust and accurately detect the plate thickness, and Automation is possible.

In addition, since the two rollers that sandwich the plate 11 are configured to be rotatable, the plate thickness can be efficiently measured while the plate 11 is being conveyed, and further, the continuous plate thickness can be measured over the entire surface of the plate 11. It is possible to easily check for defective plate thickness and the like.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory view showing the constitution of one embodiment of the present invention,
In the figure, 11 is a plate, 12 is a lower surface, 13 is a first roller, and 14 is a second roller.
Roller, 15 conversion unit, 16 rotary encoder, 17
Is a cylinder, 18 is a working plate, 19a, 10b are belts, 20a, 20b, 2
0c is a pulley.

In the present embodiment, it was carried out as a plate thickness detecting mechanism in a punching press working apparatus for sheet metal.

As shown in FIG. 1, a first roller 13 which is rotatable at a position in contact with the lower surface 12 of the plate 11 whose thickness is to be measured is fixed. An arrow B is formed by the cylinder 17 in the direction directly above the first roller 13.
A rotatable second roller 14 that moves up and down as described above is provided. The up-and-down movement of the second roller 14 is transmitted to the belt 19a passed between the pulley 20a and the pulley 20b in the conversion unit 15 through the operation plate 18 fixed to the roller, and the rotation of the pulley 20b is further transmitted through the belt 19b to the pulley. It is transmitted to 20c as a rotary motion. The rotary encoder 16 is adapted to interlock with the pulley 20c.

The rotary encoder used in the present embodiment is a so-called absolute rotary encoder which, when an arbitrary position is designated as a reference position, displays the rotation amount from this position by the pulse number of an absolute value.

The plate thickness detecting mechanism having such a configuration can actually detect the plate thickness as follows.

Referring to FIG. 1, first, without the plate 11, the second
The cylinder 17 of the roller 14 is extended and lowered to a position in contact with the first roller 13. The absolute value of the pulse of the rotary encoder at this position is designated as "0".
This adjustment work is performed only once at the beginning and is no longer necessary, and the adjustment work itself is simple.

Next, the second roller 14 is raised by the cylinder 17 to the position shown by the solid line, and when the measuring plate 11 is conveyed from the direction of arrow A and reaches the first roller 13, a sensor (not shown) detects this. Then, the second roller 14 is lowered to the position shown by the broken line, and the plate 11 is sandwiched between the first roller 13 and the second roller 14.

The vertical movement of the second roller 14 as described above always rotates the belt 19a through the operating plate 18. When the second roller 14 is lowered from the solid line position to the broken line position, the belt 19a is pushed down, so that the pulley 20c is rotated via the pulleys 20a, 20b and the belt 19b in the direction indicated by each arrow in the conversion unit 15. The rotational movement of the pulley 20c is faithfully transmitted to the rotary encoder as it is. In this way, in the conversion unit 15,
The vertical movement of the second roller 14 is converted into rotational movement.

Therefore, the absolute number of pulses displayed on the rotary encoder 16 at the time when the two rollers sandwich the plate 11 is read. This number of pulses indicates the number of pulses required to move from the "0" position designated in the first adjustment, and therefore the distance moved by the second roller 14 in the thickness direction of the plate 11 is displayed as the rotation amount. is there. Since the number of displayed pulses changes depending on the size of the rotary encoder and pulley used, the moving distance of the second roller 14 per pulse is measured in advance at the time of adjustment, and this is set to the displayed number of pulses. By multiplying, the plate thickness can be calculated accurately and easily. Since this calculation can be automated, it is possible to directly display the plate thickness, or to automatically stop the device or sound an alarm when the plate thickness is different from the preset plate thickness.

In this embodiment, the moving distance per pulse is set to 1/10 mm, but if higher accuracy is required, the moving distance per pulse may be reduced, for example, 1/100 m.
It is also possible to set it to about m or less.

As described above, in the present embodiment, the plate thickness detection mechanism can be easily adjusted for accurate measurement, and since it can be automated, it can be incorporated into an automated sheet metal stamping press working device or the like. Further, this plate thickness detection mechanism can easily detect even if there is a two-sheet feeding of the sheet metal or a sheet thickness defect of the sheet metal itself due to an erroneous operation of a mechanism for feeding the sheet metal or the like, so that high quality product processing can be efficiently performed. It became so.

[Effect of device]

As described above, the plate thickness detection mechanism of the present invention sandwiches the plate between two rollers and detects the amount of movement of the rollers by the rotary encoder, which enables easy and accurate plate thickness measurement. Then, it became possible to automate the measurement.

[Brief description of drawings]

 FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present invention. In the figure, 11 is a plate, 12 is a lower surface, 13 is a first roller, 14 is a second roller, 15 is a conversion unit, 16 is a rotary encoder, 17 is a cylinder, 18 is a working plate, 19a and 10b are belts, 20a, 20b, 20c are pulleys.

Claims (1)

[Scope of utility model registration request] 1. A rotatable first roller (13) fixed at a position in contact with a lower surface (12) of a plate (11), and vertically moving in a direction directly above the first roller (13). A rotatable second roller (14) for sandwiching (11) with the first roller (13); a conversion part (15) for converting vertical movement of the second roller (14) into rotational movement; A plate thickness detection mechanism comprising a rotary encoder (16) for detecting the amount of rotation in the conversion section (15).