JPH0739072B2 - Automatic supply device for grinding material in desktop automatic centering machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an automatic grind material supply device for a tabletop automatic centering machine for centering and chamfering lenses and the like.

(Prior Art and Problems to be Solved by the Invention) Conventional automatic centering machines for lenses and the like are variously configured, but high-precision ones are often large in size because each member is enlarged to reduce distortion. It has a problem that a large installation space is required.

In addition, when downsized, the adaptability of various grinding work becomes poor,
It had the drawback that it was specialized and automation became difficult.

In view of the above problems, the present invention provides a desk-top type automatic centering machine capable of highly precise grinding and automatic processing while reducing the size of the apparatus, and in this desk-top type automatic centering machine, automatic supply of a material to be ground is performed. It is an object of the present invention to provide a device that enables the above.

(Example) First, a desk-top type automatic centering machine applied to the device of the present invention will be described with reference to FIGS. 5 to 10.

A support shaft 2 horizontally installed on a hinge member protruding from the rear end of the base 1.
Is provided with a rear end of the feed table 3 located on the base 1 so as to be swingable in the circumferential direction (arrow A) and slidable in the axial direction (arrow B). The workpiece clamping device 4 is configured in the front end cutout portion.

The workpiece clamping device 4 has a work shaft 5 and a clamp shaft 6 which are coaxially opposed to each other and rotatably pivoted between the holders 7 and 8 which are fixed to the ends of the shafts 5 and 6, respectively. The abrasive material a is clamped. The work shaft 5 is axially installed via a work spindle 9 in a state where it is prevented from sliding in the axial direction, and is pivotally connected to a cam shaft 11 via a gear group 10. The mechanism 12 becomes detachable.

The clamp shaft 6 is rotatably provided via a clamp spindle 14, and the rear end of the clamp shaft 6 is attached to the clamp spindle.
A piston of a clamp cylinder 15 provided at the rear end of 14 is connected in the axial direction, and a fluid pressure such as air or oil is applied to the clamp cylinder 15 via a pressure adjusting valve 16 so that the clamp shaft 6 can be advanced. In addition, the clamp handle 21 makes it possible to move back and forth.

Further, the clamp shaft 6 is rotatably connected to the cam shaft 11 via a gear group 17, the gear group 17 has the same rotation ratio as the gear group 10, and the work shaft 5 and the clamp shaft 6 are at a constant speed. Both of the gear groups 10 and 17 are configured to rotate, and each of the gear groups 10 and 17 is a camshaft of the work shaft 5 and the clamp shaft 6 by a recombining mechanism (not shown) of the gear group 17 formed at the inner end of the gear switching handle 18. It is configured so that the rotation ratio with respect to 11 can be changed.

The cam member 20 of the transverse feed mechanism 19 can be attached to and detached from the outer end of the cam shaft 11.

The cam member 20 of the lateral feed mechanism 19 is a roller arm 22 in which a lateral feed cam 20a formed in the axial direction is projected from the support shaft 2.
A roller provided at the end is abutted to press the feed base 3 in the direction of arrow c. The roller arm 22 slides along an arm guide 35 fixed to the feed base and the feed base 3 is supported. The coil spring 23 provided on the shaft 2 always elastically urges in the direction opposite to the arrow c and slides laterally along the lateral feed cam 20a. In addition, the roller arm 22
Is connected to the support shaft 2 in the axial direction via a rod of the left chamfering micrometer 24, and the axial relative position of the roller arm 22 with respect to the support shaft 2 can be finely adjusted.

A notch cam 20b formed in the radial direction of the cam member 20 is pivotally mounted in a vertically slidable manner on a bracket 25 fixed to a side end of the base 1, and is fixed by a notch cam handle 26. It abuts on a roller 26a pivotally mounted on the upper end of the sliding rod 26, swings the feed base 3 in the direction of arrow A about the support shaft 2, and separates the copying cam 13 from the roller 27a of the cutting amount determining mechanism 12. The roller 27a is a base 1
A sliding rod 27 which is slidable in the vertical direction via a diameter-determining micrometer 29 with respect to a bracket 28 fixed to the side end of the slider 28 and is fixed by a diameter-determining handle 30.
It is pivotally attached to the upper end of.

Reference numeral 31 is a right chamfering micrometer interposed between the support shaft 2 and the hinge member, and the support shaft 2 can be moved relative to the base 1 in the axial direction.

32 is a grindstone drive motor installed inside the base 1,
A disk-shaped grindstone 33, in which diamond powder or the like axially attached to the shaft end is fixedly formed on a peripheral grindstone, is located below the facing portion of the work shaft 5 and the clamp shaft 6 in parallel with the both shafts, and has a flat circumference. Part grinding surface 33a and left chamfering grindstone 33b inclined inward
And a right chamfering grindstone 33c.

Reference numeral 34 designates a work drive motor installed inside the base 1, and the work drive motor 34 is rotationally connected to the cam shaft 11 via a drive transmission mechanism 35 provided on the support shaft 2. Is.

In the desk-top type automatic centering machine having the above configuration, the work material 5 is clamped between the holders 7 and 8 provided at the ends of the work shaft 5 and the clamp shaft 6, and the grindstone driving motor 32 and the work driving motor 34 are turned on. By doing so, grinding of the outer periphery of the material a to be ground and double-sided machining are automatically performed. The operation and effect thereof will be described below.

First, when sandwiching the workpiece a between the holders 7 and 8, the clamp handle 21 is swung in the direction of arrow D.

Due to this swinging action, the piston of the clamp cylinder 15 retracts, and at the same time the clamp shaft 6 and the holder 8 retract, and since both holders 7 and 8 open, the material a to be ground is sandwiched between the holders again. Clamp handle
21 is oscillated in the direction opposite to the arrow D, and then high pressure air applied to the pressure regulating valve 16 is conducted to apply a constant pressure to the clamp cylinder 15 to clamp the workpiece a at a predetermined pressure.

At the end of the work shaft 5, a copying cam 13 having the same diameter as the outer diameter of the material to be ground a or the same shape as the deformed shape is attached in advance, and fine adjustment in the radial direction is performed by a diameter determining micrometer 29.

Further, the sliding amount of the workpiece a in the axial direction by the feed cam 20a is the left chamfering micrometer 24 and the right chamfering micrometer 31.
Can be modified by.

FIG. 12 is a graph showing the relationship between the displacement of the workpiece a with respect to the grindstone 33 and each feed cam when the rotation ratio of the work shaft 5 and the cam shaft 11 is adjusted to 3: 1. The cam shaft 11 rotates once. By doing so, the entire grinding process is completed.

(I) When the cam shaft 11 starts to rotate, the roller 26a is disengaged from the protruding portion of the cutting cam 20b, the feed base 3 moves down the work shaft 5 with the support shaft 2 as a fulcrum, and the workpiece a rotates. The grinding wheel 33 is abutted to start grinding.

(II) At this time, the lateral feed cam 20a is at the interruption position, and therefore the material to be ground a drops to the peripheral grindstone 33a of the grindstone 33.

This lowering limit is determined by the abutment of the outer diameter determining copying cam 13 of the cutting amount determining mechanism 12 mounted on the work shaft 5 and the roller 27a, and is ground by the rotation of the copying cam 23 accompanying the rotation of the work shaft 5. The material a is the copying cam 13 against the peripheral grindstone 33a.
The outer periphery having the same shape is ground.

(III) Next, when the cam member 20 rotates about one third, the roller arm 22 is pressed along the lateral feed cam 20a, so that the feed base 3 moves in the direction of arrow C. Due to this movement, the material to be ground a sandwiched between the clamps 7 and 8 is the grindstone 33.
The right corner portion is ground with respect to the right chamfering grindstone 33c, and this grinding amount is performed by rotationally adjusting the right chamfering micrometer 31.

(IV) When the cam member 20 rotates about two thirds, the feed table 3 is pushed back by the elasticity of the coil spring 23 along the lateral feed cam 20a.

Due to this movement, the workpiece a is left chamfering wheel 33b of the grinding wheel 33.
On the other hand, the left corner is ground, and this grinding amount is performed by rotationally adjusting the left chamfering micrometer 24.

(V) When the cam member 20 makes one round, the protruding portion of the cutting cam 20b comes into contact with the roller 26a again, and the feed table 3 is lifted upward, so that the workpiece a is separated from the grindstone 33.

At the same time, the work drive motor 34
Is turned off, the rotations of the work shaft 5 and the clamp shaft 6 are stopped, and the clamp handle 21 is tilted as described above to remove the product that has been ground.

Next, with reference to FIGS. 1 to 4, a description will be given of a structure in which the automatic grinding material supply mechanism 40 of the present invention is added to the tabletop automatic centering machine.

The feed base 41 of the automatic feed mechanism 40 for grinding material is tiltably pivoted via a hinge mechanism 4a with a bracket 42 fixed to the front end of the feed base 3, and is interposed between the lower end of the bracket 3a and the feed base 41. The tilting air cylinder 42 is configured to be angularly displaced in the arrow E direction.

Reference numeral 43 denotes a grinding material accommodating wall that is erected on the upper surface of the supply table 41, and an adjustment wall 44 having an L-shaped cross section is erected parallel to the accommodating wall to accommodate a channel-shaped grinding material accommodating material. In addition to forming the groove 45, a bearing 46 projecting from the rear end of the accommodation groove 45 is slidably mounted with a push shaft 47 having a push end 47a at the tip, and is elastic in the direction of arrow F by a coil spring 48. It is made by energizing. Reference numeral 49 is a guide groove extending from the inner end of the grinding material accommodating groove 45 to the end of the work shaft 5 and having a groove width wider than the thickness of the grinding material a.
A notch 50 through which the holders 7 and 8 are inserted is formed, and a stopper 49a is fixedly provided at the groove end.

Further, an extruding member 51 that advances and retracts in the groove is inserted into the guide groove 49, and the extruding member 51 is provided on the supply base 41 so as to be orthogonal to the work shaft 5 and the piston rod end of the supply air cylinder 52. The air cylinder 52 expands and contracts to reciprocate in the guide groove 49. Reference numeral 53 is a detaching air nozzle opened toward the holder 7.

54 is a cutter that is attached to the grindstone 33 instead of the grindstone 33. The cutter 54 is provided with cutter members 56, 56 ... At equal intervals in the circumferential direction with respect to a cutter blade mounting board 55.
56 has a peripheral cutting blade 57 and a chamfering cutting blade 58, respectively, which can be moved and adjusted in the left-right direction and the radial direction,
It is configured to adjust the cutting amount with respect to the material to be ground a.

The automatic grinding material supply device in the lens double-sided automatic centering machine configured as described above is configured by stacking a large number of grinding materials a preliminarily cut into a rectangular plate shape into the accommodation groove 45 of the supply base 41 in a coil. The push shaft 47 is retracted against the elasticity of the spring 48,
Between the pushing edge 47a and the edge of the guide groove 49. After setting, automatic operation is started.

First, when the supply air cylinder 52 extends, the push-out member 51 fixed to the end of the piston rod pushes forward the first work material a located in the guide groove 49 and moves forward,
One piece of the material to be ground a is moved to the position of the stopper 49a at the end and fed into the notch 50.

At the same time, the tilting air cylinder 42 expands, the feeding table 41 tilts around the hinge mechanism, and at the same time, the guide groove 49 integrated with the feeding table 41 is also displaced, and the notch 50 part has the work shaft 5 and the clamp shaft 6. It comes to be located between the holders 7 and 8.

In the above state, the clamp shaft 6 advances due to the extension of the grinding material holding mechanism 4, holds the grinding material a between the holders 7 and 8, and then the tilting air cylinder 42 contracts so that the guide grooves 49 form the both shafts. Move away from 5,6.

Next, when the work driving motor 34 rotates, the cutter 54, which is rotating at a high speed, is elastically pressed in the direction of the material a to be ground, and the peripheral surface cutting blade 57 and the chamfering cutting blade 58 of the cutter member 56 move the material to be ground a. Although the peripheral surface cutting and the double-sided cutting are performed at the same time, the cutter 54 has an outer diameter determining copying cam provided on the work shaft 5.
Since it comes into contact with 13 and the depth of cut is regulated, when the work shaft 5 makes one revolution, the material to be ground a will have an outer diameter determining copy cam 13
It is cut into the same shape as, and simultaneously double-sided.

When the work shaft 5 goes around once, the work drive motor 34 stops,
At the same time when the workpiece clamping mechanism 4 contracts and both holders 7 and 8 open, air is instantaneously ejected from the air nozzle 53,
The work to be ground a is blown away and separated.

Further, at the same time when the supply table 41 is returned to the original position by the tilting air cylinder 42, the supply air cylinder 52 is extended, the pushing member 51 slides back in the guide groove 49, and is retracted to the accommodation groove 45 in the last retracted position. The next workpiece to be ground a is pushed out by the elasticity of the coil spring 48, and is set in the next ground state.

By repeating the above operation, the material to be ground a is automatically supplied and processed automatically, and the non-grinding material is automatically supplied up to the last set sheet.

As described above, since the apparatus of the present invention is configured to move the work shaft 5 and the clamp shaft 6 holding the material to be ground in the axial direction and the radial direction by the cam mechanism with respect to the grindstone 33 that rotates fixedly, Therefore, the load is reduced, so that the distortion of each part is small and the accuracy is improved.

Further, the cam member 20 constitutes a cutting cam 20b and a lateral feeding cam 20a so as to obtain an approximate movement amount of the feed table 3, and regarding the cutting amount, a copying cam 13 attached to the work shaft 5 and a diameter determining micrometer 29 are used. The lateral feed amount is finely adjusted by the left chamfering micrometer 24 and the right chamfering micrometer 31, which are provided in the axial direction, respectively, so that the product can be ground with extremely high accuracy. It is a thing.

Further, by exchanging the copying cam 13 attached to the work shaft 5, not only the lens having the same shape but also various shapes can be automatically ground.

(Effects of the Invention) The device of the present invention, by being provided in the above-described automatic double-sided centering machine, makes it possible to completely automatically process the set workpiece, and not only can the processing time be shortened,
Efficient machining can be performed with almost no workers required. Therefore, according to the device of the present invention, it is possible to significantly reduce the production cost of the lens to be ground,
The practical effect after the present invention is carried out is extremely large, such that it becomes possible to manufacture a product of stable quality.

[Brief description of drawings]

FIG. 1 is a plan view of an essential part of the present invention, FIG. 2 is a partially cutaway side view of the first illustrated device, FIG. 3 is a front view of a cutter, and FIG.
FIG. 5 is a sectional view taken along line XI-XI in FIG. 3, FIG. 5 is a front view of a tabletop automatic centering machine to which the device of the present invention is applied, FIG. 6 is a left side view, FIG. 7 is a right side view, 8 is a schematic plan view showing the internal mechanism of the feed table, FIG. 9 is a sectional view taken along the line VV in FIG. 5, FIGS. 10a, 10b and 10c are front views of the copying cam, and FIG. 11 is a cam member. FIG. 12 is a graph showing the relationship between the displacement of the material to be ground with respect to the grindstone and the cam. 1-base, 2-support shaft, 3-feed base, 4-grinding material clamping device, 5-work shaft, 6-clamp shaft, 7,8-holder, 11-cam shaft, 12-cutting depth Mechanism, 13 ~ outer diameter deciding copy cam, 15 ~ clamp cylinder, 19 ~ cross feed cam mechanism,
20-cam member, 22-roller arm, 24-left chamfering micrometer, 29-diameter determining micrometer, 31-right chamfering micrometer, 32-grinding wheel drive motor, 33-grinding stone, 34
~ Work drive motor, 40 ~ Automatic grinding material supply device, 41
-Supply table, 42-Tilt air cylinder, 45-Accommodation groove, 47-Push groove, 49-Guide groove, 51-Extrusion member, 52-Supply air cylinder, 53-Air nozzle, a-Material to be ground,

Claims (1)

[Claims] 1. A material to be ground (a), which is openably and closably sandwiched between a work shaft (5) and a clamp shaft (6), which are arranged opposite to a feed table (3) pivotally mounted on a base (1). ) Is the base (1)
In a table-top type automatic centering machine such as a lens that is moved down and away from the outer peripheral surface of a disk-shaped grindstone (33) rotated by a grindstone drive motor (32) provided in the front end of the feed table (3). Supply stand (4
1), a tilting air cylinder (42) provided between the supply table (41) and the feed table (3) and swinging the supply table (41), and the tilting air cylinder (42) with respect to the supply table (41). The work shaft (5) and the clamp shaft (6) are arranged so as to be orthogonal to each other, and the tip of the work shaft (5) and the clamp shaft (6) are interposed by the swing of the supply base (41). Alternatively, the guide groove (49) to be interposed, the accommodating groove (45) which is orthogonal to the rear end portion of the guide groove (49) and communicates with each other, and a large number of materials to be ground accommodated in the accommodating groove (45). A push shaft 47 for elastically biasing (a) toward the guide groove (49) and an extruding member (51) slidably inserted in the guide groove (49) are provided on the work shaft (5). And a supply air cylinder (52) provided so as to move back and forth between the clamp shaft (6) and the clamp shaft (6). The abrasive material automatic feeding device in the winding machine.