JP2001062617A - Collet chuck device, workpiece machining/holding method by collet chuck device, and polygon mirror machining/ holding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deformation of a workpiece in machining a surface to be machined by pressing and holding a plurality of closable collet chuck claw members fitted into a fitting hole of the workpiece to hold the workpiece, to chuck claws, and controlling the operation of a holding mechanism and an opening/closing drive mechanism. SOLUTION: Each side face 10A of opening/closing claw members 10, 12 or the like of a collet chuck 4 is fitted into a sliding surface 6B of a hollow tip part 6A of a spindle member and moved in A-B directions to open/close. After perpendicularity determining operation is completed, a cylinder driving means is actuated to actuate a piston 8C in a D-direction, and a polygon mirror 1 is fixed to the pressing faces 10D, 12D or the like of collet chuck opening/closing claws by a keep member 46. The collet chuck 4 is moved forward by a slider driving means to move the polygon mirror 1 into a machining position between cutting means. Machining of a surface to be machined is carried out by a rotating means, and after machining is completed, the polygon mirror 1 is released from the opening/closing claws by moving operation in the direction of an arrow mark C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a collet chuck device.

[0002] The present invention also relates to a method for processing and holding an object to be processed using a collet chuck device.

[0003] The present invention further relates to a method of processing and holding a polygon mirror using a collet chuck device.

[0004]

2. Description of the Related Art There is a collet chuck (apparatus) which can be opened and closed as a means / method for fixing and holding the object to be machined at the time of machining the object to be machined.

[0005]

In an image forming apparatus such as a copying machine or a laser beam printer, a polygon mirror is used for laser beam scanning.

As shown in FIG. 10, the polygon mirror 1 has a substantially disk shape, and has a central hole in which a shaft hole 1a for attaching a rotation axis is formed.
b, 1c are formed.

The reflection planes 1b, 1 of the polygon mirror
c is due to the reflection of the laser beam, and its plane roughness accuracy is 0.
Finish to 05μm or more.

The reflecting planes 1b, 1 of the polygon mirror 1
The processing of c is performed by fixing and holding the polygon mirror 1 by the fixing means via the shaft hole and applying a rotating cutter to the reflection planes 1b and 1c. When the fixing means is fixed and held by the collet chuck, the collet chuck is fixed. After inserting the opening / closing claw into the shaft hole 1a, the opening / closing claw of the collet chuck is expanded to perform the centering operation of the polygon mirror.

At the time of fixing operation of the polygon mirror, a large holding force acts on the inner diameter of the shaft hole by the operation of expanding the opening and closing claw of the collet chuck, and the polygon mirror is deformed outward as shown in FIG.

When the reflecting planes 1b and 1c are machined in this state, the polygon mirror is removed from the collet chuck after the machining operation, and as shown in FIG.
As a result, b and 1c are in a recessed state, and as a result, it is difficult to obtain the processing dimensional accuracy of the design value.

[0011]

According to the present invention, a workpiece such as a polygon mirror is held by a collet chuck mechanism so that the workpiece does not deform when the workpiece is machined. An object of the present invention is to propose a collet chuck device, wherein a plurality of collet chuck pawl members which can be opened and closed to hold the processed object by being fitted into mounting holes of the processed object, and to open and close the chuck claws. An opening / closing drive mechanism, a holding mechanism that presses and holds a workpiece attached to the collet chuck claw member against the chuck claw, a unit that controls operation of the opening / closing drive mechanism, and a unit that controls operation of the holding mechanism. The object of the present invention is to solve the above-mentioned problems by proposing a collet chuck device characterized by comprising:

Further, the present invention is characterized in that the opening / closing drive mechanism includes a taper member for driving the collet chuck claw to advance and retreat, and the accuracy of control of the movement amount of the collet chuck opening / closing claw by the taper angle of the taper member is improved. An improved collet chuck device is proposed.

Further, there is proposed an embodiment of a collet chuck device wherein the control means of the opening / closing drive mechanism has a moving means driven by a motor, and the movement is performed by controlling the position of the motor drive means.

Further, one aspect of the present invention is a novel collet chuck mechanism, in which an opening and closing operation of a collet chuck opening and closing claw member is performed by screwing means.

Another aspect of the present invention is a method of processing and holding an object to be processed by a collet chuck device, wherein the opening and closing claw of the collet chuck is inserted into a hole for holding the object to be processed, and then the opening and closing claw of the collet chuck is inserted. Open the centering operation of the holding hole and the collet chuck of the object to be processed, pressurize and hold the object to be processed to the collet chuck while maintaining the centering holding state, and then, The object is achieved by a method of processing and holding an object to be processed by a collet chuck device characterized by performing processing.

Another aspect of the present invention is a method for processing and holding a polygon mirror, wherein an opening / closing claw member of a collet chuck is inserted into a center hole of the polygon mirror, and the diameter of the opening / closing claw is enlarged in the center hole. Performing a centering operation of the polygon mirror and the collet chuck to maintain the centering state and pressurize and hold the polygon mirror to the collet chuck, and then close an opening / closing claw of the collet chuck. The above problem is solved by a mirror processing and holding method.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIGS. 1 to 5 are views for explaining one embodiment of the present invention.

FIG. 1 shows a sectional structure of a collet chuck device according to the present invention.
Reference numeral 6 denotes a main shaft member of the collet chuck 4. The main shaft member 6 has a built-in air cylinder mechanism 8.

8A is a cylinder chamber, 8B is a piston, 8
Reference numerals C and 8D denote piston shafts, and a distal end 6A of the main shaft member 6 has a hollow structure.

Numerals 10, 12, and 14 denote opening / closing pawl members of the collet chuck. Each side surface 10A of the pawl member is fitted into a sliding groove 6B of a hollow distal end portion 6A of the main shaft member.
開 閉 Open / close operation by moving in the B direction.

Reference numerals 16 and 18 denote moving block members of the collet chuck opening / closing claw members 10, 12 and 14, and the front end side thereof is a rear side surface 1 of the opening / closing claw member 10.12.14.
0A and 12A.

Reference numeral 20 denotes an operating member having a conical shape, and the conical operating member 20 is a shaft portion 8 of the piston member 8B.
C, and the free ends of the moving block members 16 and 18 are engaged with the conical tapered surface 20A of the operating member 20.

An operation plate member 22 has one end 22 thereof.
A is fitted into the shaft 8C of the piston 8B and is in contact with the operating member 20.

The other end 22B of the operation plate member 22 is exposed outward from an opening 6C formed in the main shaft member 6.

Numerals 24, 26 and 28 (not shown) are spring members for biasing the moving block members 16 and 18, and are held in receiving holes formed in the main shaft member 6 to press the moving block members. .

The operation of the operating plate member 22 is controlled by a mechanism 30 for driving the opening and closing of the collet chuck opening and closing claw members 10, 12, and 14. The driving mechanism 30 is connected to a servo motor 32 and an output shaft of the servo motor. Coupling 34, ball screw 3 coupled to said coupling 34
6, a ball screw nut 38, bearing members 40 and 42, and the like.

The servo motor 32 has an encoder 4
4 is set.

An end 22 B of the operation plate member 22 is screwed to the ball screw 38.

Reference numeral 46 denotes a holding member for the polygon mirror 1 of the object to be processed. The screw 46A is screwed and fixed to the screw 8D at the tip of the piston shaft 8C.

In the above configuration, the taper angle of the conical portion of the operating member 20 is set to 10 degrees.

The screw pitch of the ball screw 36 is 1 mm.

The encoder 44 of the servo motor 32
Is 1000 pulses / revolution.

Therefore, when the motor 32 operates for one pulse, 1/1000 × tan10 degrees = 0.00017
6 mm, 0. Each collet chuck opening / closing claw member moves by a distance of 000176 mm.

FIG. 3 is a view for explaining the configuration of a main part of a processing device for processing the polygon mirror 1 using the collet chuck device according to the present invention.

In FIG. 3, reference numeral 50 denotes an apparatus base, 5
Reference numerals 2 and 54 denote holding tables for cutting means, and the rotating plates 52A and 52
Attach the cutting tools 52B and 54B to 4A and rotate
To control the rotation.

In this embodiment, the rotating speed of the cutting tool by the rotating means 56 is 6000 rpm, and the cutting tool is a diamond cutting tool.

The bytes 52B, 5 in FIG.
The interval of 4B is set at a distance of 20 mm.

Reference numeral 58 denotes a collet chuck holding means for holding the collet chuck device 4 according to the present invention.
The collet chuck holding means 58 is held on the slider base 58A, and is controlled by a slider driving means 60 such as a motor to move on the slider base 58A in the direction of arrows EF.

Numeral 62 denotes a vertical position determining means, which is shown in FIG.
Is a device for positioning the vertical surfaces of the processing surfaces 1b and 1c of the polygon mirror 1 temporarily fixed to the collet chuck opening / closing claws 10, 12, and 14, and a vertical positioning member movable in the GH direction. 62A and a motor driving means 62B for driving the member 62A forward and backward in the GH direction.

The vertical extension member 62A has a base 5
0 when the collet chuck holding means 58 is at the standby position in the F direction.
The vertical positioning member 62A moves in the G direction to perform vertical positioning of the processing surfaces 1b and 1c of the polygon mirror 1 attached to the collet chuck opening / closing claw with respect to the reference surface 50A.

Next, the working operation of this embodiment will be described with reference to the control block diagram of FIG.

In the working preparation state, the collet chuck holding means 58 is at the preparation position in the direction of arrow F in FIG.

In the collet chuck device 4 in the preparation position, the piston 8B of the cylinder is located to the left in FIG. 1, the ball screw 36 is also in the preparation position, and the operating plate member 22
Is also in the preparation position in the D direction.

The collet chuck opening / closing claw members 10, 12,
Reference numeral 14 is at a position in the direction B in the figure due to the pressing force of the spring members 24, 26, 28.

In this state, the mounting hole of the polygon mirror 1 of the workpiece is inserted into the collet chuck opening / closing claw, and the holding member 46 is tightened.

The mounting hole 1 of the polygon mirror 1
The inner diameter of a is a processing accuracy of 10 mm ± 0.01 mm.

Subsequently, the operation of the collet chuck opening / closing claw by the driving mechanism 30 is controlled. 100 pulses of the number of pulses by the encoder 44 by the servo motor driving means 64
The operation of the motor driving means 64 is stopped by counting the 0 pulse.

As described above, the operating plate member 22 moves in the direction of 0.000176 mmC at the number of 1000 pulses, whereby the collet chuck opening / closing claw member has the minimum value of the hole 1a within the mounting hole 1a of the polygon mirror. 9.9
From 9.95mm, which is smaller than 9mm, the maximum value of the hole 1a
0.1m up to 10.05mm larger than 0.01mm
Move the range of m.

The collet chuck opening / closing claw executes the centering operation of the polygon mirror 1 by this series of operations.

The pulse output of the encoder is set to a prescribed 10
After the 00 pulse count, the current control of the servomotor is switched to the position control.

Thereafter, the collet chuck opening / closing claw is moved by 2 μm in the B direction by controlling the position of the motor.

In this state, the motor driving means 62A of the vertical positioning means 62 is operated to move the vertical positioning member 62A to the G position.
The polygon mirror to be processed 1b, 1c
To perform the vertical operation of the polygon mirror.

After the vertical setting operation by the vertical setting means is completed, the cylinder driving means 66 is operated to move the piston 8
C is actuated in the D direction to press the collet chuck opening / closing claw of the polygon mirror 1 by the pressing member 46.
D, 12D, and 14D (not shown) are fixed.

FIG. 5 shows a state where the polygon mirror 1 is fixedly held by the collet chuck 4 in the above process.

After the polygon mirror is fixed by the cylinder driving means 66, the collet chuck 4 is moved in the direction E of FIG. 3 by the slider driving means 60 to move the polygon mirror to a processing position between the cutting means 52 and 54.

After the slider driving means 60 moves the collet chuck 4 to the processing position, the rotating means 56 performs the processing of the processing surfaces 1b and 1c of the polygon mirror by the processing tools 52B and 54B.

After the machining, the holding of the polygon mirror by the cylinder driving means 66 is released, and the operation of the operating plate member 22 in the direction of arrow C in FIG. Is released, and then the polygon mirror is removed.

Description of Second Embodiment FIG. 8 is an explanatory view of a second embodiment of the collet chuck device according to the present invention.

In the drawing, reference numeral 100 denotes a body portion of the collet chuck, 72 denotes a shaft portion, 74 denotes a cylinder chamber provided in the shaft portion 72, 72A denotes a piston, and 72B denotes a piston 72.
A shaft member attached to A.

The tip of the shaft portion 72 of the collet chuck is formed hollow, and a driving member 76 for opening and closing the opening and closing claws of the collet chuck is fitted into the hollow portion 72C.

The driving member 76 has a disk shape having a through hole 76A through which the shaft member 72B is inserted, and a gear portion 76B which is screwed with the gear 78 is formed on the outer peripheral surface thereof. Is formed with a spiral tooth portion 76C which is screwed with the collet chuck opening / closing claw.

Reference numerals 80 and 82 denote opening / closing claw members of the collet chuck, which are formed of three to four members, and form a groove which engages with a dovetail groove 72D formed on the distal end surface of the hollow portion 72C of the shaft portion 72. I have.

At the rear of the collet chuck opening / closing claws 80, 82, spiral teeth 80A, 82A for screwing with the spiral teeth 76C of the driving member 76 are formed.

Reference numeral 84 denotes a gear member of an operating mechanism for operating the collet chuck opening / closing claw, which is connected to the output shaft of the motor 86.

Reference numeral 88 denotes an encoder.

A polygon mirror processing apparatus using the collet chuck mechanism 90 shown in FIG. 8 uses the apparatus shown in FIG.

FIG. 9 is a control block diagram in the case where the collet chuck mechanism 90 of the second embodiment is mounted on the collet chuck holding means 58 of FIG. 3 to process a polygon mirror.

Next, the operation of this embodiment will be described with reference to FIGS.

The collet chuck 90 of this embodiment shown in FIG. 8 is mounted on the collet chuck holding means 58 of the processing apparatus shown in FIG.

The collet chuck opening / closing claws 80 and 82 are held at the preparation positions in the direction of arrow K, and the polygon mirror of the object to be processed is mounted.

At the preparatory position of the slider 58A in the F direction (FIG. 3), the vertical operation of the polygon mirror to be processed 1b, 1c is performed by the vertical operation means 62, and the motor drive means 92 is driven to drive the gear. Drive member 7 via 84
The collet chuck opening / closing claw members 80, 82, and 84 (not shown) are moved in the J direction of the arrow by rotating the 6 to perform a centering operation.

After the centering operation is completed, the piston 72A is moved in the direction of arrow L by the cylinder driving means 94 to fix the polygon mirror of the workpiece to the collet chuck opening / closing claw.

The polygon mirror is tightened by the holding member 46 shown in FIG.

Thereafter, the slider 58 is moved by the slider driving means 96 to the machining preparation position in the direction of arrow E in FIG.

Thereafter, the cutting operation of the polygon mirror by the cutting tool rotating means 98 is executed.

[0076]

As described above, the present invention relates to a collet chuck device for holding an object to be processed, which is capable of opening and closing to hold the object to be processed by fitting into a mounting hole of the object to be processed. A plurality of collet chuck pawl members, an opening / closing drive mechanism for opening and closing the chuck jaws, a holding mechanism for pressing and holding a workpiece attached to the collet chuck jaw member against the chuck jaws, and an operation of the opening / closing drive mechanism. A collet chuck device comprising a control unit and a control unit for controlling the operation of the holding mechanism can improve the processing accuracy of the processing surface of the workpiece.

In particular, the opening / closing drive mechanism is provided with a taper member for driving the collet chuck pawl forward and backward, so that the moving accuracy of the object to be processed is improved and the processing accuracy is improved as a result. did it.

Further, the control means of the opening / closing drive mechanism has a moving means driven by a motor, and the control means is operated by controlling the position of the motor driving means. Was able to increase accuracy.

Further, as a method of processing and holding an object to be processed by a collet chuck device, the opening and closing claw of the collet chuck is inserted into a holding hole of the object to be processed, and then the opening and closing claw of the collet chuck is opened to hold the object to be processed. The centering operation of the hole and the collet chuck is performed, the object to be processed is pressed and held on the collet chuck while maintaining the centering holding state, and thereafter, the surface of the object to be machined is machined. The centering accuracy was improved by the method of processing and holding the object to be processed by the collet chuck device described above.

Further, in the method of processing and holding a polygon mirror, an opening / closing claw member of a collet chuck is inserted into a hole of the polygon mirror, and the diameter of the opening / closing claw is increased in the hole, so that the polygon mirror and the collet chuck can be closed. A centering operation is performed, the centering state is maintained, the polygon mirror is pressed and held on the collet chuck, and thereafter, the opening and closing claws of the collet chuck are closed. This has contributed to the improvement of processing accuracy and, consequently, the performance of an image forming apparatus equipped with the polygon mirror.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a configuration of a main part of a collet chuck device according to the present invention.

FIG. 2 is a front view of a collet chuck opening / closing claw in a P direction of FIG. 1;

FIG. 3 is an explanatory diagram of a configuration of an apparatus for processing a workpiece using the collet chuck device according to the present invention.

FIG. 4 is a control block diagram.

FIG. 5 is an explanatory diagram of a state where a workpiece is held by a collet chuck device.

FIG. 6 is an explanatory diagram of a holding state during processing of a polygon mirror.

FIG. 7 is an explanatory diagram of a holding state during processing of a polygon mirror.

FIG. 8 is an explanatory diagram of the configuration of the second embodiment.

FIG. 9 is a control block explanatory diagram of the second embodiment.

FIG. 10 is an explanatory diagram of a polygon mirror.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Workpiece (polygon mirror) 4 Collet chuck device 6, 72 Main shaft member of collet chuck 8, 74 Cylinder chamber 10, 12, 14, 80, 82, 84 Collet chuck opening / closing claw 16, 18 Moving member 20 Operating member 22 Operation Plate member 24, 26 Spring member 30 Moving mechanism 32 Servo motor 34 Coupling 36 Ball screw 52, 54 Holding means for processing means 56, 98 Byte rotating means 58 Slider 60, 96 Slider driving means 62 Vertical positioning means 64 Servo motor driving means 66, 94 Cylinder drive means 70, 100 Device control means

Claims (6)

[Claims] 1. A collet chuck device for holding an object to be processed, comprising: a plurality of collet chuck pawl members capable of opening and closing to hold the object to be processed by being fitted into mounting holes of the object to be processed; An opening and closing drive mechanism for opening and closing the chuck jaws, a holding mechanism for pressing and holding an object to be processed attached to the collet chuck jaw member against the chuck jaws, a unit for controlling the operation of the opening and closing drive mechanism, and the holding mechanism Means for controlling the operation of the collet chuck. 2. The collet chuck device according to claim 1, wherein the opening / closing drive mechanism includes a taper member that drives the collet chuck pawl forward and backward. 3. The collet chuck device according to claim 2, wherein the control means of the opening / closing drive mechanism includes a moving means driven by a motor, and the movement is performed by controlling the position of the motor driving means. 4. A collet chuck for inserting a collet chuck opening / closing claw member into a mounting hole of a workpiece and fixing the workpiece by opening the collet chuck opening / closing claw member. A collet chuck device, wherein a screwing means is formed on a joint surface with a driving member for driving the collet chuck opening / closing claw member to open / close. 5. A method for processing and holding an object to be processed by a collet chuck device, wherein the opening and closing claw of the collet chuck is inserted into a hole for holding the object to be processed, and the opening and closing claw of the collet chuck is opened. The centering operation of the holding hole and the collet chuck is performed, the object to be processed is pressed and held on the collet chuck while maintaining the centering holding state, and thereafter, the surface of the object to be processed is machined. A method for processing and holding an object to be processed by a collet chuck device, characterized in that: 6. A method of processing and holding a polygon mirror, comprising: inserting an opening / closing claw member of a collet chuck into a hole of the polygon mirror; expanding the opening / closing claw in the hole; Perform a centering operation, maintain the centering state, press-hold the polygon mirror on the collet chuck, and then
A method for processing and holding a polygon mirror, comprising closing an opening / closing claw of a collet chuck.