JP2010099780A - Electrically-powered holding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrically-powered holding device capable of dispensing with air piping from a vacuum generator and reducing air consumption and contributing to reduction of power consumption. <P>SOLUTION: A workpiece is sucked and held by making the inside of a suction pad 23 vacuum so that air is exhausted from a ventilation hole 19c of the other end section while a screw member 21 is rotated at a designated direction by rotatably driving an electric motor 31 and by sucking the air in the suction pad 23. Suction of the workpiece is released by braking the vacuum condition in such a way that the compressed air is supplied to the suction pad via the ventilation hole at one end section by compressing the air flowed from the ventilation hole at the other end section while the screw member is reversely rotated from the direction by rotatably driving the electric motor in a reverse direction from the direction. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention is mounted, for example, on a workpiece transfer device such as a molded product take-out machine or a parts feeder, and adsorbs or grips the workpiece when taking the molded product or part of the workpiece into a predetermined position. The present invention relates to an electric holding device.

  For example, in a molded product take-out machine mounted on a resin molding machine, a vacuum suction system in which a plurality of suction pads connected to a vacuum generator (negative pressure generator) are attached to a chuck that is controlled to move in at least a two-dimensional direction. A device is provided. The vacuum suction device holds the workpiece by vacuum suction by bringing a suction pad into contact with the workpiece in a vacuum generation state. In addition to the vacuum suction device, a pneumatic gripping device is known that grips a workpiece by reciprocally swinging a gripping finger provided on a chuck by a pneumatic operating member such as an air cylinder.

  However, in the vacuum suction device and the pneumatic gripping device described above, it is necessary to pipe the vacuum generation device such as an air compressor and the suction pad with a pipe or the like. It takes time and labor to install the air piping, and the assembly workability of the work transfer device is poor. Especially in a factory where multiple work transfer devices are installed, it is necessary to connect one vacuum generator and multiple work transfer devices to the air piping. And have the problem of taking time.

Moreover, in the vacuum generator, when a certain degree of vacuum is reached, the drive of the air compressor is interrupted to reduce power consumption by the air compressor. However, there is a problem that the airtightness cannot be effectively reduced because the air-tightness is insufficient due to insufficient vacuum tightness.
JP-A

The problem to be solved is that air piping from the vacuum generator is required, and the assembly workability of the work transfer device is poor. In addition, the operating time of the vacuum generator is long and the power consumption cannot be reduced.

According to a first aspect of the present invention, there is provided a cylinder member having a hollow portion therein and having a vent hole at one end and the other end, and a screw rotatably supported in the hollow portion of the cylinder member. A member, a suction pad attached to one end of the cylinder member, and having a through hole communicating with the vent hole at the one end at the center; and the screw member connected in the forward and reverse directions. It consists of an electric motor that rotates selectively, and rotates the electric motor to rotate the screw member in a predetermined direction to suck air in the suction pad and exhaust it from the vent hole at the other end. The vacuum is formed and the work is adsorbed and held, while the electric motor is rotated in the opposite direction to rotate the screw member in the opposite direction to compress the air flowing from the vent hole at the other end. And vacuum break Te whereas by feeding into the suction pad through the vent end and cancels the suction of the work.

Claim 2 has a hollow part inside, a cylinder member provided with a vent hole at one end part and the other end part, a screw member rotatably supported in the hollow part of the cylinder member, A rotor magnet fixed to the outer periphery of the screw member in the cylinder member and having different magnetic poles arranged alternately in the circumferential direction and rotating integrally with the screw member, and opposed to the rotor magnet on the outer periphery of the cylinder member. And a suction pad that is attached to one end of the cylinder member and has a through-hole that communicates with the vent hole at the one end at the center. By rotating the member in a predetermined direction, the air in the suction pad is sucked and exhausted from the vent hole at the other end, thereby forming a vacuum in the suction pad and sucking and holding the work On the other hand, an electric current in the opposite direction to the above is applied to the stator coil to rotate the screw member in the opposite direction to compress the air flowing in from the vent hole at the other end, and through the vent hole at the one end. By supplying into the suction pad, the inside of the suction pad is broken in vacuum and the suction of the workpiece is released.

A third aspect of the present invention provides a cylinder member having a hollow portion therein and provided with a vent hole at one end and the other end, a screw member rotatably supported in the hollow portion of the cylinder member, An electric motor that is connected to the screw member and selectively rotates the screw member in forward and reverse directions, and is provided on one end side of the cylinder member and supports a piston slidable in the axial direction inside. An operating member provided with an operating shaft on the piston, a pair of gripping members supported swingably on the front end side of the operating member, and having a gripping portion on the front end side and an operating portion on the rear end side; The pair of gripping members is composed of an elastic member that urges the gripping part in either the direction toward or away from the gripping part. The electric motor is driven to rotate and the screw member is rotated in a predetermined direction to pass the other end. From the pores A pair of gripping members are swung in a direction in which each gripping part approaches each other by a working shaft that moves by moving the piston by sliding the piston by supplying compressed air into the working member and gripping the workpiece. It is characterized by.

Claim 6 has a hollow part inside, a cylinder member provided with a ventilation hole in one end and the other end, a screw member rotatably supported in the hollow part of the cylinder member, A rotor magnet fixed to the outer periphery of the screw member in the cylinder member and having different magnetic poles arranged alternately in the circumferential direction and rotating integrally with the screw member, and opposed to the rotor magnet on the outer periphery of the cylinder member. A stator coil provided on one end side of the cylinder member, and an operating member that supports a piston that is slidable in the axial direction and has an operating shaft provided on the piston. A pair of gripping members supported swingably on the front end side and having a gripping portion on the front end side and an operating portion on the rear end side, and the pair of gripping members in the direction in which the gripping portion approaches and apart from each other An elastic member urging in either direction, applying current to the stator coil to rotate the screw member in a predetermined direction and flowing the compressed air flowing through the vent hole at the other end into the working member. The workpiece is gripped by swinging the pair of gripping members in directions in which the gripping portions approach each other by an operating shaft that is moved to slide the piston.

  The present invention eliminates the need for air piping from the vacuum generator, and can efficiently assemble the workpiece transfer device. Moreover, the air consumption of the whole molding factory can be reduced and it can contribute to reduction of power consumption.

In the present invention, the electric motor is driven to rotate, the screw member is rotated in a predetermined direction, the air in the suction pad is sucked and exhausted from the vent hole at the other end, thereby forming the vacuum in the suction pad to form the workpiece. While adsorbing and holding, the electric motor is driven to rotate in the opposite direction to rotate the screw member in the opposite direction to compress the air flowing in from the other end of the vent hole, and the one end of the vent hole The best mode is to release the suction of the workpiece by breaking the vacuum by supplying it into the suction pad through the.

The present invention will be described below with reference to the drawings showing embodiments.
As shown in FIG. 1, the electric holding device of the present invention is mounted on a resin molding machine (not shown) and takes out a molded product as a molded workpiece from a mold and opens it to a predetermined opening position. It is attached to a chuck 3 of a molded product take-out machine 1 as an apparatus. The molded product take-out machine 1 is known, for example, a running body 7 supported so as to reciprocate in the longitudinal direction on a running frame 5 extending in a direction orthogonal to the central axis of the resin molding machine, and the running body 7. The front and rear traveling body 11 supported so as to reciprocate in the front and rear frame 9 attached so as to extend in a direction coinciding with the central axis, and the front and rear traveling body 11 have an axis in the vertical direction, The upper and lower unit 13 is provided so as to move up and down with a predetermined vertical stroke, and a chuck 3 for holding a molded product is attached to the lower part. The chuck 3 is three-dimensionally moved between a mold position in the resin molding machine and an open position outside the resin molding machine in accordance with the movement of the traveling body 7, the front and rear traveling body 11, and the vertical unit 13.

  The chuck plate 15 of the chuck 3 is provided with a reversing means for rotating the holding surface of the chuck plate 15 between the vertical position and the horizontal position as necessary with respect to the lower part of the upper and lower unit 13 (the figure shows a reversing means. The example is not shown.) A plurality of electric suction devices 17 constituting the electric holding device according to the present invention are attached to the chuck plate 15.

  As shown in FIGS. 2 and 3, the cylinder member 19 of each electric adsorption device 17 is provided on the holding surface side of the chuck plate 15, and the screw 21 is disposed in the inner cylindrical hollow portion of the inner cylindrical hollow portion. It is airtight and is rotatably supported. The closing plate on the tip side of the cylinder member 19 is provided with a plurality of vent holes 19a and a pad mounting portion 19b. The pad mounting portion 19b is formed of an elastic material such as silicon rubber, and has a cylindrical mounting cylindrical portion 23a at the base end portion and a suction portion 23b inclined in the radial direction and the distal end side at the distal end side. A suction pad 23 is attached.

A through hole 23c is formed at the center of the suction portion 23b of the suction pad 23 and communicates with the cylinder member 19 through the vent hole 19a. The mounting cylindrical portion 23a is inserted into the tip end portion of the cylinder member 19 while being elastically deformed, and is attached in an airtight manner.

  A vent hole 19c communicating with the hollow cylindrical portion is formed at the rear portion of the cylinder member 19. Further, the closing plate 25 on the rear end side of the cylinder member 19 has a shape larger than the outer shape of the cylinder member 19, and a shaft hole 25 a is formed at the center to project the shaft of the screw 21. Further, on the outer peripheral side of the closing plate 25, an attachment hole 25b through which the fixing screw 27 is inserted when the electric suction device 17 is attached to the chuck plate 15 is formed. The chuck plate 15 is formed with a through hole 15a through which the shaft of the screw 21 is inserted and a screw hole 15b into which a nut portion 29 to which the fixing screw 27 is screwed is inserted.

  On the back side of the chuck plate 15, electric motors 31 are arranged corresponding to the respective electric suction devices 17. The rotating shaft of each electric motor 31 is connected to the shaft of the screw 21 by a coupling 33 in the through hole 15a. Further, a nut portion 29 inserted into the nut hole 15b is fixed to the case of each electric motor 31. The nut portion 29 has an outer diameter larger than the inner diameter of the mounting hole 25c.

  Next, the adsorption action of the molded product 35 as a workpiece by the electric adsorption device 17 configured as described above will be described.

  First, the operation of taking out the molded product 35 by the molded product take-out machine 1 will be described. When a mold opening signal is output from the resin molding machine to the molded product take-out machine 1 with the chuck 3 moved to the standby position, the upper and lower units 13 Is moved downward to move the chuck 3 to the position of the molded product 35 held in the mold, and then the front and rear traveling bodies 11 are moved forward to make the chuck 3 face the molded product 35 in a relative state. The electric suction device 17 is driven to suck and the molded product 35 is sucked and held on the suction pad 23. Next, the front and rear traveling bodies 11 are moved rearward to extract the molded product 35 from the mold, and then the upper and lower units 13 are driven up to move the chuck 3 to the standby position. Drive to move the chuck 3 to the open position. Next, in the above state, the front and rear traveling bodies 11 and the upper and lower units 13 are driven as necessary to move the chuck 3 to a predetermined position of the open position, and then the electric suction device 17 is driven to suck and suck. The holding of the molded product 35 by the pad 23 is released. After the above operation, the traveling body 7, the front and rear traveling body 11 and the vertical unit 13 are driven in the opposite direction to move the chuck 3 to the standby position and wait.

Next, the adsorption action and adsorption release action of the molded product 35 by the electric suction device 17 will be described. As shown in FIG. 4, when the suction pad 23 is opposed to the molded product 35 held in the mold, The motor 31 is driven to rotate, the screw 21 is rotated in the direction of the solid arrow shown in FIG. 4, and the air in the suction portion 23b is exhausted from the vent hole 19c on the rear end side by the pumping action of the screw 21. A negative pressure (vacuum) is formed inside to hold the molded product 35 by suction. In addition, at the time of adsorbing and holding the molded product 35, the rotation drive of the electric motor 31 is continued to maintain the negative pressure state.

On the other hand, in order to release the adsorption hold of the molded product 35, as shown in FIG. 5, the electric motor 31 is driven to rotate in the direction opposite to the above and the screw 21 is rotated in the direction of the broken line arrow shown in FIG. The air flowing in from the air holes 19c is compressed and injected from the air holes 19a and the through-holes 23c into the suction portion 23b to break the negative pressure, and the suction state of the molded product 35 by the suction portion 23c is forcibly released.

In the present embodiment, the molded product can be sucked and held by forming a negative pressure in the suction portion 23b of the suction pad 23 without connecting the air pipe from the vacuum generator to the molded product take-out machine 1. It is possible to assemble the unloader 1 in an efficient manner. In addition, air consumption and power consumption for generating negative pressure can be reduced as compared with the conventional case using a negative pressure generator.

  Example 2 is an electric suction device in which an electric motor is integrated with a cylindrical housing that supports a screw. As shown in FIG. 6, a screw 55 is provided in a cylindrical housing 53 of the electric suction device 51. Is rotatably supported, and a cylindrical rotor 57 is fixed to the outer periphery of the screw 55 so as to rotate integrally with the screw 55. Further, on the outer peripheral surface of the cylindrical rotor 57, a rotor magnet 59 arranged so that magnetic poles are different in the circumferential direction is inserted and fixed.

A minute gap is provided between the inner peripheral surface of the cylindrical housing 53 and the outer peripheral surface of the rotor magnet 59. Further, vent holes 53 a and 53 b are formed in the cylindrical rotor 57 in the front closing plate and the rear portion of the cylindrical housing 53. Further, a mounting portion 53c for the suction pad 61 is provided at the front portion of the cylindrical housing 53, and the suction pad 61 is attached to the mounting portion 53c so that the through hole 61a communicates with the vent hole 53a.

A stator coil 63 is mounted on the outer peripheral surface of the cylindrical housing 53, and the rotor magnet 59 constitutes an electric motor.

The electric suction device 51 is attached to the chuck 3 of the molded product take-out machine 1 in the same manner as in the first embodiment, and is used for the purpose of sucking and holding the molded product 35. The same as in the first embodiment. About the member, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

When the molded product 35 is attracted, a current is applied to the stator coil 63 to generate a magnetic field to generate a magnetic attractive force or a magnetic repulsive force with the rotor magnet 59, thereby causing the cylindrical rotor 57, and thus the screw. 55 is rotated in the direction of the solid line arrow shown in FIG. Thus, the air in the suction portion 23b of the suction pad 23 is sucked by the pump action of the screw 55 and exhausted from the vent hole 53b to form a negative pressure in the suction pad 61, and the molded product 35 is sucked and held.

On the other hand, in order to release the adsorption of the molded product 35, a current in the opposite direction to the above is applied to the stator coil 63 to rotate the cylindrical rotor 57 and thus the screw 55 in the direction of the broken line arrow shown in FIG. As a result, air is introduced from the vent hole 53b by the pumping action reverse to that described above by the screw 55, compressed, and injected into the suction pad 61, whereby the negative pressure is broken and the suction of the molded product 35 is forcibly released. .

In the above description, the permanent magnet type is used as the electric motor for rotating the cylindrical rotor 57 and therefore the screw 55 in the forward and reverse directions. However, any conventional electric motor structure such as an electromagnet type may be used.

  The third embodiment relates to an electric gripping device as an electric holding device that grips a molded product using the vacuum (negative pressure) generating mechanism shown in the first and second embodiments. FIG. 8 showing the electric gripping device shows an example in which the vacuum generation mechanism shown in the first embodiment is used, but the same applies to the case where the vacuum generation mechanism shown in the second embodiment is used. In the third embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 8, an operating member 63 is attached to the cylinder member 19 of the electric gripping device 61. The actuating member 63 includes an actuating cylinder 65 having a hollow portion therein, a piston 67 supported so as to be slidable in the axial direction within the actuating cylinder 65, and connected to the piston 67 to be outside the actuating cylinder 65. And a cam 71 having a truncated cone shape or a triangular shape.

  A pair of opposing gripping levers 75 as gripping members are supported on the mounting plate 73 fixed to the operating cylinder 65 so as to be swingable about a shaft 75a. A pair of opposing gripping levers 75 includes a gripping portion 75b that grips the molded product 35 on the distal end side and a cam surface 75c that serves as an operating portion on which the cam 71 slides. The pair of opposing gripping levers 75 are always urged in a direction in which the gripping portions 75b are always separated from each other by the elastic member 77 such as a compression spring mounted on the distal end side from the shaft 75a, so that the cam surfaces 75c are close to each other. The

Next, the gripping action and the grip releasing action of the molded product 35 by the electric gripping device 61 will be described.
As shown in FIG. 9, when gripping the molded product 35, the electric motor 31 is driven to rotate, the screw 21 is rotated in the direction of the solid line arrow shown in the figure, and the air sucked from the vent hole 19 c is compressed to form the vent hole. It is supplied into the actuating member 63 through 19a, and the piston 67 is slid in the direction of the solid arrow shown in the figure. As a result, the pair of gripping levers 75 swings in the direction in which the gripping portions 75b come close to each other against the elastic force of the elastic member 77 in accordance with the sliding contact of the cam 71 with the cam surface 75c. The product 35 is gripped.

  On the other hand, in order to release the gripping of the molded product 35, the electric motor 31 is driven to rotate in the opposite direction to the above, and the screw 21 is rotated in the direction of the broken arrow shown in the figure to And the piston 67 is slid in the direction of the broken arrow shown in the figure. As a result, as the cam 71 slides on the cam surface 75 c, the pair of grip levers 75 are swung in a direction in which the grip portions 75 b are separated from each other by the elastic force of the elastic member 77 to release the grip of the molded product 35.

  In the first to third embodiments, the electric holding device is provided in the molded product take-out machine, and the description has been made based on the example in which the molded product as the workpiece is sucked or held and held. However, the electric holding device according to the present invention is attached. The workpiece transfer device may be a parts feeder that holds various components and supplies them to a processing machine, or a sheet supply device that holds various sheets (films) and supplies them to a processing machine or the like.

  In the third embodiment, the cam is slidably contacted with the cam surface to swing the pair of gripping levers. However, the operating portion and the operating shaft of the pair of gripping levers are connected by a link, and the pair of gripping is performed. The structure which rocks a lever may be sufficient.

1 is an overall perspective view of a molded product take-out machine on which an electric suction device as an electric holding device of the present invention is mounted. It is a disassembled perspective view of the electric attraction apparatus attached to the chuck | zipper board. It is a center longitudinal cross-sectional view of an electric attraction apparatus. It is explanatory drawing which shows the adsorption | suction state of the molded article by an electric adsorption apparatus. It is explanatory drawing which shows the molded article adsorption | suction cancellation | release state by an electric adsorption apparatus. It is a center longitudinal cross-sectional view which shows the electric adsorption apparatus as an electrically-driven holding | maintenance apparatus which concerns on Example 2. FIG. It is explanatory drawing which shows the effect | action of the electric adsorption apparatus which concerns on Example 2. FIG. It is a partially broken central longitudinal sectional view showing an electric gripping device as an electric holding device according to a third embodiment. It is explanatory drawing which shows the effect | action of the electric gripping apparatus which concerns on Example 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold take-out machine 3 as workpiece transfer device Chuck 5 Traveling frame 7 Traveling body 9 Front / rear frame 11 Front / rear traveling body 13 Vertical unit 15 Chuck plate 15a Through hole 15b Screw hole 17 Electric adsorption device 19 as electric holding device Cylinder member 19a Vent hole 19b Pad mounting part 19c Vent hole 21 Screw 23 Suction pad 23a Mounting cylindrical part 23b Suction part 23c Through hole 25 Closure plate 25a Shaft hole 25b Mounting hole 27 Fixing screw 29 Nut part 31 Electric motor 33 Coupling 35 Molding as workpiece It is explanatory drawing which shows the effect | action of goods.

Claims (8)

A cylinder member having a hollow portion therein and having a vent hole at one end and the other end;
A screw member rotatably supported in the hollow portion of the cylinder member;
A suction pad attached to one end of the cylinder member and having a through hole communicating with the vent hole at the one end at the center;
An electric motor connected to the screw member and selectively rotating the screw member in forward and reverse directions;
The suction motor is rotated and driven to rotate the screw member in a predetermined direction to suck the air in the suction pad and exhaust it from the vent hole on the other end to form a vacuum in the suction pad to suck the work On the other hand, the electric motor is rotationally driven in the opposite direction to rotate the screw member in the opposite direction to compress the air flowing in from the other end portion of the vent hole, thereby forming the one end portion of the vent hole. An electric holding device that breaks the vacuum and releases the workpiece by feeding it into the suction pad. A cylinder member having a hollow portion therein and having a vent hole at one end and the other end;
A screw member rotatably supported in the hollow portion of the cylinder member;
A rotor magnet that is fixed to the outer periphery of the screw member in the cylinder member, and that magnetic poles that are different in the circumferential direction are alternately arranged, and rotates integrally with the screw member;
A stator coil provided opposite to the rotor magnet on the outer periphery of the cylinder member;
A suction pad attached to one end of the cylinder member and having a through hole communicating with the vent hole at the one end at the center;
The current is applied to the stator coil, the screw member is rotated in a predetermined direction, the air in the suction pad is sucked and exhausted from the vent hole at the other end, and the suction pad is vacuum-formed to form the workpiece. While adsorbing and holding, a current in the opposite direction to the above is applied to the stator coil to rotate the screw member in the opposite direction to compress the air flowing in from the vent hole at the other end, thereby passing the one end. An electric holding device that releases the suction of the workpiece by breaking the vacuum inside the suction pad by supplying the suction pad through the pores. A cylinder member having a hollow portion therein and having a vent hole at one end and the other end;
A screw member rotatably supported in the hollow portion of the cylinder member;
An electric motor connected to the screw member and selectively rotating the screw member in forward and reverse directions;
An actuating member provided on one end side of the cylinder member, supporting an internally slidable piston in the axial direction and having an operating shaft provided on the piston;
A pair of gripping members supported pivotably on the distal end side of the operating member, having a gripping portion on the distal end side and an operating portion on the rear end side;
An elastic member that urges the pair of gripping members in either the direction in which the gripping part approaches or moves away from each other;
Actuating to rotate and drive the electric motor to rotate the screw member in a predetermined direction, to flow in the air hole from the other end, supply the compressed air into the working member, and slide the piston to move An electric holding device that grips a workpiece by swinging a pair of gripping members by a shaft in a direction in which the gripping portions approach each other. 4. The cam according to claim 3, wherein the operating shaft is provided with a cam whose outer diameter increases from the distal end toward the base end, and the operating portion is provided with a cam surface on which the cam is slidably contacted. An electric holding device that opens and closes a pair of gripping members as it comes into contact. 4. The electric holding device according to claim 3, wherein the operating shaft of the operating member and the operating portion of the gripping member are connected via a link and open and close the pair of gripping members as the operating shaft moves in the axial direction. A cylinder member having a hollow portion therein and having a vent hole at one end and the other end;
A screw member rotatably supported in the hollow portion of the cylinder member;
A rotor magnet that is fixed to the outer periphery of the screw member in the cylinder member, and that magnetic poles that are different in the circumferential direction are alternately arranged, and rotates integrally with the screw member;
A stator coil provided opposite to the rotor magnet on the outer periphery of the cylinder member;
An actuating member provided on one end side of the cylinder member, supporting an internally slidable piston in the axial direction and having an operating shaft provided on the piston;
A pair of gripping members supported pivotably on the distal end side of the operating member, having a gripping portion on the distal end side and an operating portion on the rear end side;
An elastic member that urges the pair of gripping members in either the direction in which the gripping part approaches or moves away from each other;
And the current is applied to the stator coil, the screw member is rotated in a predetermined direction, the compressed air flowing in from the vent hole at the other end is supplied into the operating member, and the piston is slid to move. An electric holding device that grips a workpiece by swinging a pair of gripping members in a direction in which the gripping portions approach each other by an operating shaft. 7. The cam according to claim 6, wherein the operating shaft is provided with a cam whose outer diameter increases from the distal end toward the base end, and the operating portion is provided with a cam surface on which the cam is slidably contacted. An electric holding device that opens and closes a pair of gripping members as it comes into contact. 7. The electric holding device according to claim 6, wherein the operating shaft of the operating member and the operating portion of the gripping member are connected via a link, and open and close the pair of gripping members as the operating shaft moves in the axial direction.

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