JP2019195876A - Seating confirmation device of work-piece - Google Patents

Abstract

To provide a seating confirmation device of a work-piece capable of accurately detecting that a plurality of kinds of work-pieces are seated.SOLUTION: A seating confirmation device of a work-piece includes: a first air passage which connects an air source and a first seating surface; a second air passage which connects the air source and a second seating surface; a first valve which is provided in the first air passage; a second valve which is provided in the second air passage; and a pressure detection section which detects pressure in the first air passage and the second air passage between the air source and the first valve and the second valve, respectively. The first seating surface is provided with a first jet port communicated with the first air passage. The second seating surface is provided with a second jet port communicated with the second air passage. When a first work-piece is seated on the first seating surface, the second valve is closed and the first work-piece closes the first jet port. When the second work-piece is seated on the second seating surface, the first valve is closed and the second work-piece closes the second jet port.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a workpiece seating confirmation apparatus.

  In a production process or the like, machining is performed after detecting that a workpiece as a workpiece is seated at a predetermined position. There is a technique using air supplied from an air source for confirmation of seating of a plurality of types of workpieces (Patent Document 1).

Japanese Utility Model Publication No. 62-42943

  However, for example, when the work is slightly lifted from the seating surface, it is difficult to accurately detect whether or not the work is seated. As a result, the machining accuracy of the workpiece decreases. Accordingly, an object of the present invention is to provide a workpiece seating confirmation apparatus capable of accurately detecting that a plurality of types of workpieces are seated.

  The object is to provide a first air passage connecting the air source and the first seating surface, a second air passage connecting the air source and the second seating surface, and a first air passage provided in the first air passage. A valve, a second valve provided in the second air passage, and a pressure in the first air passage and the second air passage between the air source and the first valve and the second valve are detected. A second jet outlet that is provided with a first jet port that communicates with the first air passage on the first seating surface and that communicates with the second air passage on the second seating surface. When the first work is seated on the first seating surface, the second valve is closed, the first work closes the first jet port, and the second work is seated on the second seating surface. The first valve is closed, and the second workpiece closes the second jet port It can be achieved by seating the verification device.

  It is possible to provide a workpiece seating confirmation device capable of detecting with high accuracy that a plurality of types of workpieces are seated.

FIG. 1 is a schematic view illustrating a seating confirmation device. FIG. 2A and FIG. 2B are cross-sectional views illustrating the valve. FIG. 3 is a schematic view illustrating a seating confirmation device when the workpiece is not seated. FIG. 4A and FIG. 4B are schematic views illustrating a seating confirmation device when a workpiece is seated.

(Embodiment)
Hereinafter, the seating confirmation apparatus 100 of this embodiment is demonstrated with reference to drawings. FIG. 1 is a schematic view illustrating a seating confirmation device 100. As shown in FIG. 1, the seating confirmation device 100 is applied to, for example, a workpiece processing facility, and includes an air source 10, air passages 11, 11a and 11b, an air sensor 12, and valves 14a and 14b.

  The air source 10 supplies air having a pressure higher than atmospheric pressure to the air passage 11, for example. One end of the air passage 11 is connected to the air source 10, and two air passages 11a and 11b branch from the other end. An air sensor 12 is provided in the middle of the air passage 11.

  A valve 14a (first valve) is provided in the middle of the air passage 11a, and a valve 14b (second valve) is provided in the middle of the air passage 11b. When the workpiece is not seated, one end of each of the air passages 11a and 11b is released to the atmosphere.

  The air sensor 12 (pressure detector) is located between the air source 10 and the valves 14a and 14b, and detects the pressure in the air passages 11, 11a and 11b between them. Whether the workpiece is seated or not can be detected by the air sensor 12 detecting the atmospheric pressure. For example, a threshold corresponding to the seating of the workpiece is determined, and if the air pressure detected by the air sensor 12 is equal to or greater than the threshold, the workpiece is seated, and if it is less than the threshold, the workpiece is not seated.

  2 (a) and 2 (b) are cross-sectional views illustrating the valve. FIG. 2 (a) illustrates a valve open state, and FIG. 2 (b) illustrates a valve closed state. The valves 14a and 14b have the same configuration. As shown in FIGS. 2A and 2B, the valves 14 a and 14 b have a body 20, a rod 22, a spring 26, and an O-ring 28. The rod 22 is accommodated in the body 20 so as to be slidable between the + Z direction and the −Z direction. The + Z side end of the rod 22 protrudes to the outside of the body 20, and the −Z side end surface contacts the spring 26. The spring 26 is made of stainless steel, for example, and applies a force in the + Z direction to the rod 22.

  Holes 30 are provided in the -Z side walls of the valves 14a and 14b, and holes 34 are provided in the side walls. An annular space is formed between the outer peripheral surface of the rod 22 and the inner wall of the body 20, and the air passage 32 is configured by the annular space.

  As shown in FIG. 2A, when the rod 22 protrudes greatly to the + Z side and is separated from the O-ring 28, the valves 14a and 14b are opened. At this time, the hole 30, the air passage 32 and the hole 34 communicate with each other, and the air supplied from the hole 30 is discharged from the hole 34 through the air passage 32.

  In FIG. 2B, when a workpiece (not shown) pushes the rod 22 to the −Z side and pushes the rod 22 down to a predetermined position, the rod 22 comes into contact with the O-ring 28 and the valves 14a and 14b are closed. Since the rod 22 compresses the O-ring 28, the hole 30 and the air passage 32 do not communicate with each other. Therefore, the air supplied from the hole 30 is not discharged from the hole 34.

  FIG. 3 is a schematic view illustrating the seating confirmation device 100 when the workpiece is not seated, and also shows cross sections of the valves 14a and 14b. As shown in FIG. 3, one end of the air passage 11 a is located on the seating surface 42, and an ejection port 43 (first ejection port) communicating with the air passage 11 a is opened on the seating surface 42. One end of the air passage 11b is located on the seating surface 44, and an ejection port 45 (second ejection port) communicating with the air passage 11b opens on the seating surface 44. The air passages 11 and 11a form an air passage (first air passage) connecting the air source 10 and the seating surface 42, and the air passages 11 and 11b are air passages (first air passages) connecting the air source 10 and the seating surface 44. 2 air passages). As will be described later, the seating surfaces 42 and 44 are surfaces on which the workpiece is seated. Holes 30 and 34 of the valve 14a are connected to the air passage 11a. Holes 30 and 34 of the valve 14b are connected to the air passage 11b.

  When the workpiece does not sit on the seating surfaces 42 and 44, the air passages 11a and 11b communicate with the atmosphere through the jets 43 and 45, and the valves 14a and 14b open. The compressed air from the air source 10 is discharged to the atmosphere through the air passages 11 and 11a and the valve 14a, and is discharged to the atmosphere through the air passages 11 and 11b and the valve 14b. The pressure in the air passage 11 becomes atmospheric pressure, and the air sensor 12 detects that the pressure is below a predetermined pressure (threshold value). Thereby, it can be seen that the workpiece is not seated on the seating surfaces 42 and 44.

  FIG. 4A and FIG. 4B are schematic views illustrating the seating confirmation device 100 when a workpiece is seated. In FIG. 4A, the workpiece 40a (first workpiece) is seated, and in FIG. 4B, another workpiece 40b (second workpiece) is seated. 4A, the work 40a is seated on the seating surface 42, and the work 40b is seated on the seating surface 44, as shown in FIG. 4B. Machining is performed on the workpiece after sitting. The workpieces 40a and 40b have protrusions 41a and 41b that protrude in the −Z direction from the lower surface, respectively.

  As shown in FIG. 4A, when the workpiece 40a is seated on the seating surface 42, the projecting portion 41a of the workpiece 40a pushes the rod 22 of the valve 14b. As a result, the valve 14b is closed. For this reason, the compressed air from the air source 10 is not supplied to the jet outlet 45 opened in the seating surface 44. On the other hand, the rod 22 of the valve 14a is not pressed by the workpiece 40a, and the valve 14a is opened. For this reason, the compressed air in the air passage 11 flows to the ejection port 43 of the seating surface 42 through the air passage 11a and the valve 14a. When the workpiece 40 a is seated on the seating surface 42, the lower surface of the workpiece 40 a closes the ejection port 43.

  Since the valve 14b is closed and the outlet 43 is closed by the work 40a, the pressure in the air passage 11 increases. When the air sensor 12 detects that the pressure in the air passage 11 exceeds the threshold value, the seating of the workpiece 40a is confirmed.

  When the workpiece 40a is slightly lifted from the seating surface 42, the valve 14b is closed, but the air passage 11a communicates with the atmosphere. For this reason, compressed air leaks out from the air passage 11a, and the pressure in the air passage 11 does not rise above the threshold value. By detecting that the pressure in the air passage 11 is lower than the threshold value by the air sensor 12, the work 40a is not in the seating state, that is, the work 40a is slightly lifted from the seating surface 42 (for example, about 10 μm). Can be detected directly. As a result, the accuracy of seating confirmation is improved.

  As shown in FIG. 4B, when the workpiece 40b is seated on the seating surface 44, the protruding portion 41b of the workpiece 40b pushes down the rod 22 of the valve 14a to a predetermined position. As a result, the rod 22 contacts the O-ring 28 and the valve 14a is closed. Moreover, although the valve 14b is kept open, the workpiece 40b comes into contact with the seating surface 44 and closes the ejection port 45. The air sensor 12 detects that the pressure in the air passage 11 is equal to or higher than the threshold value, and seating of the workpiece 40b is confirmed.

  According to this embodiment, when the workpieces 40a and 40b are not seated, the air passages 11, 11a, and 11b communicate with the atmosphere. On the other hand, when the workpiece 40 a is seated on the seating surface 42, the valve 14 b is closed and the workpiece 40 a closes the ejection port 43. When the workpiece 40b is seated on the seating surface 44, the valve 14a is closed and the workpiece 40b closes the ejection port 45. When the workpiece 40a or 40b is thus seated on the seating surface, the pressure in the air passages 11, 11a and 11b increases. Therefore, by detecting the increased pressure by the air sensor 12, it is possible to detect with high accuracy that the workpiece 40a or 40b is seated on the seating surface. As a result, machining in a state where the workpiece is displaced is suppressed, and machining accuracy is improved.

  The valves 14 a and 14 b are provided with an O-ring 28. When the rod 22 presses the O-ring 28, the valves 14a and 14b are closed. This effectively cuts off the air flow and improves the accuracy of seating confirmation.

  For example, the distance between the seating surface 42 and the valve 14b in the Z-axis direction is equal to the length of the protrusion 41a from the lower surface of the workpiece 40a. The distance between the seating surface 44 and the valve 14a in the Z-axis direction is equal to the length of the protrusion 41b from the lower surface of the workpiece 40b. It is preferable to adjust the seating surface and the position of the valve according to the size and shape of the workpiece.

  In addition to the pressure sensor, for example, a pressure switch that is turned on at a pressure equal to or higher than a threshold value and turned off at a pressure lower than the threshold value may be used. This embodiment can also be applied to a process using three or more types of workpieces. The workpiece may be seated on the corresponding seating surface, and the plurality of valves communicated with the jet ports opened in the seating surface other than the seating surface may be closed.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

10 Air source 11, 11 a, 11 b, 32 Air passage 12 Air sensor 14 a, 14 b Valve 20 Body 22 Rod 26 Spring 28 O-ring 30, 34 Hole 40 a, 40 b Work piece 41 a, 41 b Protruding part 42, 44 Seating surface 43, 45 Spout 100 Seating confirmation device

Claims (1)

A first air passage connecting the air source and the first seating surface;
A second air passage connecting the air source and the second seating surface;
A first valve provided in the first air passage;
A second valve provided in the second air passage;
A pressure detector that detects pressure in the first air passage and the second air passage between the air source and the first valve and the second valve;
A first jet port communicating with the first air passage is provided in the first seating surface;
A second jet port communicating with the second air passage is provided in the second seating surface;
When the first work is seated on the first seating surface, the second valve is closed, the first work closes the first jet port,
When the second work is seated on the second seating surface, the first valve is closed and the second work closes the second jetting port.

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