JPH0212565Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a plate number detection device used in a plate loader or the like.

When a plate material loader uses a vacuum pad to adsorb and lift plates, the plates are separated one by one by a floater using a magnet and then adsorbed by the vacuum pad. In some cases, a plurality of the above-mentioned plates are suctioned and lifted as one body.
Therefore, the plate loader is equipped with a device that detects whether two or more plates are being lifted together in close contact with each other.The detection device includes a coil that generates a magnetic field above and below the plates. There is a known device that detects the number of plates by inserting a coil into the plate and detecting the degree of change in the state of the magnetic field generated by the coil depending on the thickness of the plate. However, in devices that utilize this change in magnetic field, when the type of plate material to be handled changes or the material changes (for example, the alloy ratio differs in the case of iron alloy plates), the degree of change in the magnetic field changes accordingly, making it difficult to accurately measure the changes in the magnetic field. Detection of the number of plate materials (detection of the thickness of the held plate materials) may not be performed.

This invention provides a board number detection device that can always accurately detect the thickness of the board and the number of boards even when conditions change, such as changes in the material of the board handled as described above. It is.

Hereinafter, embodiments will be described based on the drawings.

FIG. 1 is a schematic front view of a plate loader 2 equipped with a plate number detection device 1 of this invention, and the plate loader 2 includes a moving frame 4 that moves along a rail 3,
It consists of a lifting frame 6 for a vacuum pad 5 vertically disposed below the movable frame 4 and a magnetic floater 7, and the movable frame 4 moves onto one of the carts 8 and the plate material W is separated by the magnetic floater 7. After that, the uppermost plate W is sucked and lifted by the vacuum pad 5, and the plate number detection device 1 of this invention is applied to the lifted plate W by the cylinder device 9.
is advanced, and the edge of the plate material W is sandwiched between a pair of rollers 11 and 12, which will be described later.

Next, the plate number detection device 1 will be explained in detail in FIG. A lifting frame 14 that freely communicates with each other, and the pair of rollers 11, 1 having an upper roller fixed to the lifting frame 14.
2 and a distance sensor 15 that moves up and down in conjunction with the roller 12 on the non-fixed side.
4 is vertically slidably connected via a linear bearing 17 inserted into a guide bar 16 fixed to the support frame 13, and is normally maintained at an intermediate height by compression springs 18 and 19 interposed above and below the guide bar 16. It is designed to be elastically held in this position.
21 is the roller 11 fixed to the lifting frame 14 as described above.
22 is the lifting frame 14.
The swing frame is made to be able to swing freely around a support shaft 23, and has the roller 12 pivotably supported at its tip.
A compression spring 24 is interposed on the upper surface of the swing frame 22 and acts against the lifting frame 14 so that the roller 12 comes into contact with the fixed roller 11 with an appropriate pressure. . A small-diameter roller 25 is pivotally supported at the other end of the swing frame 22, and the roller 25 is brought into rolling contact with an elevating body 27 as described below.

That is, the elevating body 27 has plate-like bodies 27b and 27c protruding from above and below a linear bearing 27a that is slidably guided by a guide bar 28 that is erected and fixed to the elevating frame 14. 27b is rolled into contact with the small diameter roller 25, and the guide bar 2
The lifting body 27 is biased downward by a weak compression spring 29 interposed in the lower plate 27c. A known distance sensor 1 that detects and displays the gap distance on a display device (not shown)
5 is installed. 31 is a pin for preventing rotation of the elevating body 27, and 32 is a connection cord for the sensor 15.

Therefore, in the plate number detection device 1 of the above example, when the support frame 13 is advanced by the advancing/retreating device such as the cylinder device 9, the pair of rollers 1 is activated as follows.
The end of the plate material W is inserted between 1 and 12, and its thickness is measured.

That is, when the support frame 13 is moved forward, the relatively end of the plate material W is guided by the outer circumference of the rollers 11 and 12 and enters between the large diameter rollers 11 and 12, as shown by the chain line in FIG. , a pair of rollers 11,
12 is opened by the thickness d against the spring 24. At this time, the plate material W is sucked and held by the loader 2, so the edge of the plate material sag slightly due to the flexibility of the material itself, and the height position may vary slightly depending on the material material or each measurement. but,
The lifting frame 14 is supported by springs 18 and 19 as described above.
Since it is held elastically by the rollers, it moves up and down slightly following the position of the plate, but the W end of the plate is pinched, and when the W end of the plate enters between the rollers 11 and 12, it is not bent incorrectly. The roller smoothly enters between the rollers 11 and 12 without any friction.

Then, as described above, a pair of rollers 1
1, 12, that is, the swing frame 22 is the thickness d of the plate material W.
If the swing frame 22 is opened by 1, the length from the support shaft 23 to the center of the large diameter roller 12 is not equal to the length from the small diameter roller 25 to the point of contact with the elevating body 27. Since there is a
7 is raised by the amount of rocking of the rocking frame 22, that is, the thickness d, and the distance sensor 15 at the other end is also lifted from the lifting frame 14 by the thickness d (dotted chain line in FIG. 2).
Therefore, the distance sensor 15 detects this lifted distance d in an analog manner and displays the value on a display device (not shown), and the display indicates whether only one plate W or a plurality of plates W have been lifted in close contact with each other. It is to determine whether the In other words, if we are currently handling a plate material with a thickness of 2.0 mm, if the above display device displays a value within the range of approximately 1.5 to 2.5 mm, taking into account variations in plate thickness depending on the measurement location. For example, it is determined that only one plate is being held by the loader 2, and if a value outside the above range, such as 3.5 mm, is displayed, it is determined that two or more plates are being held in close contact with each other. It is.

Note that various known distance sensors can be used as the distance sensor 15, and it is also possible to attach the sensor 15 to one end of the swinging frame 22 in the above example where the small diameter roller 25 is provided. The swinging displacement of the movable frame 22 is converted into vertical displacement via an elevating body 27, and a distance sensor 1 is attached to the elevating body 27.
5, the distance sensor 15 can be accurately lifted and moved in a straight line, and the distance d can be measured more accurately.

As is clear from the above explanation, the plate number detection device according to the invention is provided with a pair of upper and lower rollers that sandwich the plate, and is also provided with a distance sensor that detects the distance between the pair of rollers. It is possible to directly measure the thickness of a board, and it is possible to accurately measure the thickness without being affected by changes in conditions such as differences in the material of the board, and it is possible to accurately detect that multiple boards are being held. can.

Also, of the pair of upper and lower rollers, one roller is fixed and the other roller is mounted on a swing frame and can move up and down, so compared to a type where both the upper and lower rollers move up and down. , the position of the pair of rollers is stabilized at a substantially constant position, and the plate material can be easily and reliably entered between the rollers. Moreover, the lifting frame that supports the rollers is provided on the support frame so that it can be raised and lowered, and this lifting frame is elastically held in a neutral position by a pair of upper and lower springs, so even though one roller is fixed, If the position of the plate is slightly shifted up or down, the pair of rollers can follow the position of the plate and sandwich the plate while moving up and down, and the plate will not be bent when it enters.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of a plate loader equipped with the plate number detection device of this invention, and FIG. 2 is a front view of one embodiment of the plate number detection device. 1... Board material number detection device, 11, 12... Roller, 15... Distance sensor, W... Board material, d...
...Thickness.

Claims (1)

[Scope of Claim for Utility Model Registration] An elevator frame provided on a support frame so as to be movable up and down, a pair of upper and lower springs that elastically hold the elevator frame at an intermediate height position, and a bracket fixed to the elevator frame. A pair of upper and lower rollers sandwiching a plate material, and a pair of upper and lower rollers that sandwich a plate material, and a second roller that is installed on a swing frame that is pivotally supported to be vertically swingable with respect to the elevating frame; a spring that urges the swinging frame to approach the swinging frame; and a distance sensor that detects the distance between the pair of rollers in conjunction with the swinging frame. Device.