JP4421865B2 - Workpiece seating confirmation device - Google Patents

Description

  The present invention relates to a workpiece seating confirmation device that detects that a workpiece is properly mounted on a gripping device used in a machine tool such as a lathe or a machining center.

Conventionally, in a gripping device such as a finger chuck for pressing a workpiece in a machine tool such as a lathe or a machining center against a seating surface, for example, a gripping device such as a finger chuck, a seating confirmation device for detecting whether or not the workpiece is seated on the seating surface is provided. There is something provided.
For example, as shown in Japanese Utility Model Laid-Open No. 7-24536, the valve rod is pushed in when the workpiece is seated, the pressure switch is operated by communicating the flow path for sending the compressed air, and the seating confirmation is performed. When the workpiece is not seated, the valve stem protrudes with the force of the spring, the flow path is closed, the output signal of the pressure switch is cut off, and the separation of the workpiece from the seating surface is confirmed.

Further, the present applicant has conventionally used a seating confirmation device as shown in FIG.
In FIG. 7, a base 103 is slidably provided on a main body 101 having an inlet 108 for sending a fluid such as compressed air and an outlet 109 for discharging the sent fluid. An O-ring 115 for sealing the fluid is provided on a sliding surface 122 on which the base 103 and the main body 101 slide.
The base 103 includes a seating surface 104 on which the workpiece W is seated, and a valve body 105 that is engaged with the slide member 121 urged by a spring A107 is incorporated therein.
The base 103 is urged toward the seating surface side by the spring B106 together with the valve body 105 and the slide member 121, and is lifted.
The valve body 105 and the slide member 121 are slidably engaged, and the valve body 105 is urged toward the body by a spring A107 provided between the valve body 105 and the base.
One end of the valve body 105 is formed so as to be insertable into an outlet 109 provided in the main body 101 and a discharge passage 113 provided in the body 102, and a seal member 120 is provided.
A fluid pipe (not shown) is disposed at the tip of the outlet 109 and is connected to a pressure detector.

When the workpiece W is seated, the seating surface 104 is pressed downward in the figure, the base 103 is pushed down against the force of the spring B, and the tip of the valve body 105 is inserted into the outlet 109, and the seal member 120 The outlet 109 is closed by pressure contact. When the fluid flow is blocked by closing the outlet 109, the pressure drop of the fluid is detected by the pressure detector, and the seating of the workpiece W is confirmed.
When the workpiece W is removed after the processing is completed, the valve body 105 is lifted upward together with the base 103 by the force of the spring B106, the outlet 109 is opened, and the fluid sent from the inlet 108 is discharged from the outlet 109, and the pressure The fluid is sent to the detector to detect the pressure, and the separation of the workpiece W from the seating surface is confirmed.

Further, in the confirmation of the seating of the workpiece W, the amount by which the seating surface 104 is pushed down due to the seating of the workpiece W slightly increases or decreases due to a manufacturing dimensional error or inclination of the workpiece W. For this reason, a seating detection range of about 4 to 6 mm is provided to reliably detect seating.
In the above configuration, since the valve body 105 slidably engaged with the slide member 121 is urged by the spring A106 and incorporated into the base 103, the base 103 is pushed down by the seating of the workpiece W. Then, the valve body 105 is lowered together with the slide member 121 against the spring B107 to block the outflow port 109, and when the base 103 is further pushed down, the valve body 105 is then slid with the outflow port 109 being blocked. 121 and the valve body 105 slide so that the base 103 is lowered against the spring A106.
Japanese Utility Model Publication No. 7-24536

For processing work that is performed by gripping the workpiece W using a gripping device such as a chuck used in a machine tool, a plurality of types of workpieces W having different outer diameters and shapes to be gripped are exchanged and processed. Is done.
At that time, in the conventional seating confirmation device as described above, it is necessary to move the mounting position of the seating confirmation device every time the workpiece W is exchanged in accordance with the size and shape of the outer diameter of the workpiece W.
Alternatively, in order to perform seating confirmation with a single seating confirmation device using a conventional seating confirmation device, the size of the seating surface 104 on which the workpiece W is seated is determined. Although it is necessary to increase the size, if the seating surface 104 is enlarged, the pressing force on the seating surface 104 due to the seating of the workpiece W is not always applied to the same position. The sliding surface 122 acts as an offset load on the seating surface 104, and the seating surface 104 is inclined.
Therefore, the base 103 slides while inclining and abutting against the sliding surface 122 between the base 103 and the main body 101, resulting in a large frictional resistance, which causes wear and malfunction. Further, the O-ring 115 provided between the base 103 and the main body 101 also acts as an offset load, lowering the sealing performance, causing fluid leakage, making it difficult to detect the seating of the workpiece.

Further, in order to reduce the unbalanced load on the seating surface 104, the outer diameter of the base 103 is increased and the main body 101 and the sliding surface 122 of the base 103 are arranged further outward to support the seating surface 104. When the base 103 is stabilized and the inclination is eliminated, the outer diameter of the O-ring 115 that seals the fluid provided on the sliding surface 122 is increased similarly to the outer diameter of the base 103, and the outer diameter of the O-ring 115 is increased. In this case, the clearance due to the dimensional tolerance becomes larger in proportion to the above, and therefore, there is a problem that fluid leakage is likely to occur.
Further, in the above-described configuration, the spring A107 that biases the valve body 105 acts to push down the slide member 121 together with the valve body 105 in FIG. In addition, a pressing force is applied by the spring A107, and a larger force is required for the spring force of the spring B106.

  Therefore, in view of the above-described problems, the present invention provides a seating confirmation device that detects that a workpiece has been properly mounted on a gripping device used in a machine tool, and a plurality of processes having different outer diameter sizes and shapes. To provide a seating confirmation device that can be used to check the seating of multiple workpieces with different outer diameters and shapes by fixing them in one place without changing the mounting position. And

A main body formed in a substantially rectangular parallelepiped shape and having a fluid flow path; a base that protrudes upward from the main body and is slidable in the vertical direction; In a workpiece seating confirmation apparatus comprising a pressure detector for confirming the seating of a workpiece by detecting the pressure of the workpiece, the workpiece seating confirmation device is provided above the base and has a seating surface on which the workpiece is seated. A receiving member that presses the base downward when the workpiece is seated, an urging means that is provided on the main body and urges the receiving member upward, and has a pin hole provided at one end of the receiving member. A work piece is provided with a bracket portion that engages with one end of the main body, a fulcrum pin that is inserted into the pin hole of the bracket portion, supports the one end of the main body, and rotatably connects the receiving member and the main body. When seated on the surface, the receiving member moves down the base. And turning on or off the pressure of the fluid pushed, the pressure detector confirms the seating of the workpiece by detecting the pressure of the fluid.

According to the present invention, the workpiece is received by the receiving member formed in the shape of a rod, and one end of the workpiece is rotatably supported, so that the workpiece can be seated at any position within the longitudinal direction of the receiving member. It is possible to confirm the seating without changing the position of the base.
Therefore, the seating can be confirmed without changing the position of the seating confirmation device in order to confirm the seating of the workpieces having different outer diameters and shapes.
In addition, although fluid piping for supplying and discharging a fluid for seating confirmation is arranged on the body, it is not necessary to provide a plurality of pipings, and seating confirmation can be performed with a fluid piping having a simple configuration.
In addition, since the mounting position of the seating confirmation device is not changed, the weight balance of the rotating gripping device as a whole is constant, and it is possible to perform precise processing by suppressing the vibration of the device during high-speed rotation of the gripping device. Become.
Further, in the configuration of the present invention, the size of the base can be reduced even if the seating detection range is widened by enlarging the receiving member. Therefore, the apparatus can be reduced in size and weight, and the centrifugal force acting during rotation can be realized. The power can be reduced.

Embodiments that are the best mode of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall cross-sectional view of a workpiece seating confirmation apparatus in an embodiment of the present invention, and FIG. 2 is an overall plan view of the workpiece seating confirmation apparatus in an embodiment of the present invention.
In FIG. 1, a body 31 to which the seating confirmation device of the present invention is attached has a supply channel 32 for supplying a fluid supplied from a supply source (not shown) and a discharge channel for guiding the supplied fluid to a discharge port (not shown). 33 is provided, an outlet 28 is provided at a connection portion of the discharge flow path 33, and a pressure detector (not shown) is provided between the discharge flow path 33 and the discharge port.
The main body 1 of the seating confirmation device attached to the body 31 is formed in a substantially rectangular parallelepiped shape, a fluid chamber 34 is provided therein, the supply flow path 32 and the discharge flow path 33 are connected, and a bolt 36 is used. It is fixed to the body 31.
A fulcrum pin support portion 10 formed in a convex shape is provided at the right end of the main body 1 in the figure, and a fulcrum pin support hole 12 is opened to the fulcrum pin support portion 10.
Above the main body 1 is provided a rod-shaped receiving member 2 that is pressed downward by the workpiece 30 when the workpiece 30 is seated, and the upper surface of the receiving member 2 is a seating surface on which the workpiece 30 abuts when seated. 7 is provided.
The receiving member 2 is formed in a substantially rectangular parallelepiped like the main body 1, and includes a bracket portion 8 that engages with a fulcrum pin support portion 10 formed in a convex shape of the main body 1 at the right end in the figure, The part 8 is formed in a reverse concave shape on both sides of the fulcrum pin support part 10 of the main body 1, and a fulcrum pin hole 9 is opened.

3 is a cross-sectional view taken along the line AA of FIG. 1 and shows a cross-sectional view of the fulcrum pin portion.
A fulcrum pin 6 penetrating through two holes, a fulcrum pin support hole 12 provided in the fulcrum pin support portion 10 and a fulcrum pin hole 9 provided in the receiving member 2, is provided, and a retaining member 35 is attached, 1, a receiving member 2 is provided so as to be rotatable.
Two contact members 20 that are in contact with the lower main body 1 are screwed and protruded downward at a substantially intermediate portion in the length direction of the receiving member 2, and are attached to a base 22 that protrudes from the main body 1. It is provided so as to contact each of the biasing means 5.
The main body 1 is provided with a base 22 slidably provided with the main body 1, and a sliding surface 39 on which the base 22 and the main body 1 slide is provided with an O-ring 17 that seals fluid. .
The base 22 is provided with a spring A25, and the base 22 is biased upward. A slide member 23 that is urged upward by a spring A25 together with the base 22 is provided inside the base 22, and is provided integrally with the base 22, and slides with the main body 1 along with the base 22. It has been made possible.

A valve body 24 having a valve portion 37 protruding from below the slide member 23 is provided inside the slide member 23 so as to be slidable with the slide member 23 and is urged downward with respect to the base 22 by a spring B26. Has been.
The valve portion 37 is provided by being inserted into an outlet port 28 provided in the body 31, and fluid flows out from the main body 1 through the outlet port 28 through a notch 38 provided in the valve portion 37. Yes.
Further, a seal member 40 is provided on the outer periphery of the valve portion 37. When the valve body 24 is lowered downward and the seal member 40 is pressed against the body 31, the outlet 28 is sealed and the outlet 28 is closed. Is blocked. The urging means 5 provided on the left side of the base 22 in the drawing includes a pressing member 18 slidably provided with the main body 1 and a urging member 19 that urges the pressing member 18 upward. The member 18 is always urged upward by a coil spring provided as the urging member 19, and urges the receiving member 2 upward via the contact member 20.

Further, on the left side in the drawing, which is the other end side of the receiving member 2 with respect to the fulcrum pin mounting side, there is stopper means 4 for locking the receiving member 2 biased upward by the biasing means 5 to a fixed position. Is provided.
A stopper shaft support portion 11 formed in a convex shape is provided at the left end portion of the main body 1 in the figure, and a stopper shaft hole 16 is opened.
4 is a cross-sectional view taken along the line BB in FIG. 1 and shows a cross-sectional view of the stopper means 4 portion.
The left end of the receiving member 2 in the drawing is provided with a stopper receiver 14 formed in a reverse concave shape on both sides of the stopper shaft support portion 11, and a stopper hole 15 having a larger diameter than the stopper shaft hole 16 is opened. Has been.
A stopper shaft 13 is inserted into the stopper shaft hole 16 of the main body 1, and the stopper shaft 13 protruding from the stopper shaft hole 16 engages with a stopper hole 15 provided in the stopper receiver 14 of the receiving member 2. Thus, the receiving member 2 urged upward by the urging means 5 is locked in a fixed position.
The stop position of the receiving member 2 at this time is such that the seating surface 7 is disposed above the seating position of the workpiece.

Next, the operation of this embodiment will be described.
FIG. 5 shows a sectional view when a workpiece 29 having a large outer diameter is seated in the present embodiment, and FIG. 6 shows a sectional view when a workpiece 30 having a small outer diameter is seated in the present embodiment.
In a state where the workpiece 29 is not installed on the seating surface 7, the base 22 is urged upward in the drawing by the spring A 25 as shown in FIG. 1 and is locked at a stepped portion provided in the main body 1. Stays.
At this time, the valve body 24 is also urged upward in the drawing together with the base 22 by the spring A 25, and the outflow port 28 is brought into a ventilation state through the notch 38 of the valve portion 37, and the fluid flowing in from the supply flow path 32. Passes through the outlet 28 and flows out into the discharge channel 33.
At this time, the biasing means 5 biases the receiving member 2 upward by a coil spring provided as the biasing member 19, and the receiving member 2 is locked to the stopper shaft 13 and remains at the stop position.
Next, when the workpiece 29 is mounted, the workpiece 29 is seated on the seating surface 7 as shown in FIG. 5, and the receiving member 2 is pushed downward. Then, the receiving member 2 is rotated counterclockwise in the figure around the fulcrum pin 6, and the receiving member 2 is inclined to the lower left in the figure.
Thereby, the contact member 20 screwed into the receiving member 2 pushes the base 22 downward.
When the base 22 is pushed down against the biasing force of the spring A25, the valve body 24 biased downward by the spring B26 with respect to the base 22 is also lowered downward, and a seal provided in the valve portion 37 The member 40 is pressed against the outlet 28, and the outlet 28 is closed to prevent fluid flow.
When the fluid flow is interrupted, the absence of fluid pressure is detected by a pressure detector (not shown), and the seating of the workpiece 29 is confirmed. When the seating of the workpiece 29 is confirmed, the workpiece 29 is processed.

Thereafter, when the workpiece 29 is removed after finishing the processing, the pressing member 18 of the urging means 5 is pushed upward by the spring force of the coil spring which is the urging member 19, and the receiving member 2 is moved upward via the contact member 20. Press to.
The receiving member 2 is rotated in the clockwise direction in the drawing around the fulcrum pin 6, is locked by the stopper shaft 13, and remains in the stop position.
At that time, the downward pressing force by the receiving member 2 acting on the base 22 is released, and the base 22 is lifted upward together with the valve body 24 by the upward biasing force of the spring A25, and the outlet 28 is made to flow upward. The blocked sealing member 40 is separated from the outlet 28, the fluid flows out through the outlet 28, the pressure detector detects the pressure of the fluid, and the separation of the workpiece 29 from the seating surface is confirmed.

FIG. 6 shows a seated state when a workpiece 30 having a smaller outer shape than the workpiece 29 of the above embodiment is used.
As shown in FIG. 6, according to the present invention, it is possible to check the seating of the workpiece by the same operation as described above even when the outer shape of the workpiece is different and the seating position of the workpiece on the receiving member 2 changes. Become.
When the workpiece 30 is mounted, the workpiece 29 is seated on the seating surface 7 and the receiving member 2 is pushed downward. Then, the receiving member 2 is rotated counterclockwise in the figure around the fulcrum pin 6, and the receiving member 2 is inclined to the lower left in the figure.
As a result, the abutting member 20 screwed into the receiving member 2 comes into contact with the base 22 and pushes the receiving member 2 downward.
When the base 22 is pushed down against the biasing force of the spring A25, the valve body 24 biased downward by the spring B26 with respect to the base 22 is also lowered, and the seal member 40 provided in the valve portion 37 is lowered. Is pressed against the outlet 28, closing the outlet 28 and preventing fluid flow.
When the fluid flow is interrupted, a pressure detector (not shown) detects that there is no fluid pressure, and seating of the workpiece 30 is confirmed. When the seating of the workpiece 30 is confirmed, the workpiece 30 is processed.

When the workpiece 30 is removed after the processing is completed, the pressing member 18 of the urging means 5 is pushed upward by the spring force of the coil spring as the urging member 19, and the receiving member 2 is moved upward via the contact member 20. Press.
The receiving member 2 is rotated in the clockwise direction in the drawing around the fulcrum pin 6, is locked by the stopper shaft 13, and remains in the stop position.
At that time, the force that pushes down the base 22 by the receiving member 2 acting on the base 22 is released, and the base 22 is lifted upward together with the valve body 24 by the upward biasing force of the spring A25. The seal member 40 that has blocked the outlet 28 is separated from the outlet 28, the fluid flows out through the outlet 28, the pressure detector detects the pressure of the fluid, and the separation of the workpiece 30 from the seating surface is confirmed. The

In the above embodiment, the stopper member 4 is provided and the upward rotation of the receiving member 2 by the urging member 5 is locked at the position where the stopper member 4 is installed, thereby limiting the rotation range of the receiving member 2. However, in the present invention, it is not always necessary to provide the stopper means 4, and when the workpiece is seated so that the receiving member 2 biased by the biasing means 5 is rotated downward by the workpiece seating. The receiving member 2 only needs to be received.
In the embodiment, the biasing means 5 is provided separately from the base 22, and the spring A25 for biasing the base 22 upward and the coil spring as the biasing means 5 for biasing the receiving member 2 upward are separately provided. Therefore, the urging force of the spring A25 provided on the base can be reduced, and the urging force for rotating the receiving member 2 upward by the coil spring is applied. However, the urging means for the coil spring is not necessarily provided separately. 5 is provided, and only the spring A25 provided on the base 22 is provided as the biasing means 5, and both the base 22 and the receiving member 2 are attached upward by the spring A25 which is one biasing means 5. By energizing, the same action can be given.
In the above embodiment, the shape of the receiving member 2 is a rectangular parallelepiped shape similar to that of the main body 1. However, in the present invention, the receiving member 2 is a rod having a longitudinal direction and is processed within the range of the longitudinal direction. It is sufficient if there is a seating position for the object, and the receiving member 2 obtains the same effect without limiting its shape.
In the above embodiment, the pressure detector is provided between the discharge channel 33 and the discharge port, and the flow of the fluid is blocked by the lowering of the base 22, and the pressure detector detects the fluid in the discharge channel 33. Although the presence of pressure is detected and seating of the workpiece is confirmed, the present invention is not limited to the above-described embodiment, and a pressure detector is provided between the supply flow path 32 and the supply source. As the table 22 descends, the flow of fluid is blocked, and the pressure detector detects that the fluid pressure in the supply flow path 32 is present, so that the seating of the workpiece can be confirmed in the same manner as in the above embodiment. . In the present invention, the pressure detector detects the presence or absence of fluid pressure generated by sliding the base 22 up and down and confirms the seating of the workpiece. Regardless of which side of the discharge is provided, it is possible to confirm the seating of the workpiece by the same action.

In the present invention, since the receiving member 2 formed in the shape of a rod is pivotally engaged with the main body 1 at one end by a fulcrum pin 6, the work piece is seated on any part of the length of the receiving member 2. Similarly, since the receiving member 2 rotates downward about the fulcrum pin 6, the base 22 provided below the receiving member 2 is pressed downward to perform the processing operation in the same manner.
For this reason, a plurality of types of workpieces having different outer shapes are used, and even if the seating position of the workpiece is changed, the workpiece can be moved to any position on the receiving member 2 as long as it is within the long range of the receiving member 2 formed in a rod shape. Even if a person sits down, the seating of the workpiece can be confirmed in the same manner.
Therefore, according to the present invention, even when a workpiece having a different outer shape is used and the seating position of the workpiece is changed, the seating of the workpiece having a different outer shape can be confirmed using the same seating confirmation device.

1 is an overall cross-sectional view of a workpiece seating confirmation apparatus in an embodiment of the present invention. 1 is an overall plan view of a workpiece seating confirmation apparatus in an embodiment of the present invention. AA arrow sectional drawing of FIG. The BB arrow sectional drawing of FIG. The partial cross-sectional enlarged view at the time of the large diameter workpiece in the Example of this invention seated. Partial cross-sectional enlarged view when a small-diameter workpiece in the embodiment of the present invention is seated The whole sectional view of the seating confirmation device of the work in the conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Receiving member 5 Energizing means 6 Support point pin 7 Seating surface 8 Bracket part 9 Support point pin hole 22 Base

Claims (1)

A main body formed in a substantially rectangular parallelepiped shape and having a fluid flow path; a base that protrudes upward from the main body so as to be slidable in the vertical direction; In a workpiece seating confirmation device comprising a pressure detector for confirming the seating of a workpiece by detecting the pressure of the workpiece, the workpiece seating confirmation device is provided above the base and is formed in a rod shape with a seating surface on which the workpiece is seated. A receiving member that presses the base downward when the workpiece is seated, an urging means that is provided on the main body and urges the receiving member upward, and a fulcrum pin hole that is provided at one end of the receiving member. A bracket portion that engages with one end of the main body, and a fulcrum pin that is inserted into the fulcrum pin hole of the bracket portion, supports the one end of the main body and the bracket portion, and rotatably connects the receiving member and the main body. , The workpiece is seated on the seating surface , Receiving member is switching on and off the pressure of the fluid pushes down the base downward, the pressure detector mount check device of the workpiece, characterized in that to check the seating of the workpiece by detecting the pressure of the fluid.

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