JPH0464829B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tabletop automatic centering machine for centering and chamfering lenses and the like.

Conventional automatic centering machines for lenses, etc. come in various configurations, but high-precision ones have problems such as requiring a large amount of installation space because each component is large to reduce distortion. It was hot.

Furthermore, miniaturization has the disadvantage that it becomes less adaptable to various grinding operations, becomes specialized, and becomes difficult to automate.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a tabletop automatic centering machine that is capable of miniaturizing the device and capable of high-precision grinding and automatic processing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the tabletop automatic centering machine of the present invention will be described below with reference to the drawings.

A support shaft 2 horizontally installed on a hinge member protruding from the rear end of the base 1 has a rear end of a feed base 3 located on the base 1 that can freely swing in the circumferential direction (arrow A) and in the axial direction ( A grinding material holding device 4 is configured in a notch at the front end of the feed table 3 so as to be slidable in the direction of arrow B).

The workpiece holding device 4 has a workpiece shaft 5 and a clamp shaft 6 rotatably pivoted to face each other on the same axis, and is mounted between holders 7 and 8 fixedly opposed to each other at the ends of both shafts 5 and 6, respectively. It comes to grip the abrasive material a.

The work shaft 5 is installed via a work spindle 9 in such a manner that sliding in the axial direction is prevented, and is rotatably connected to a cam shaft 11 via a gear group 10, and has a depth of cut determined at its outer end. The outer diameter determining copying cam 13 of the mechanism 12 is detachable and replaceable.

The clamp shaft 6 is rotatably installed via a clamp spindle 14, and the rear end of the clamp shaft 6 is axially connected to a piston of a clamp cylinder 15 provided at the rear end of the clamp spindle 14. Fluid pressure such as air or oil is applied to the cylinder 15 via the pressure regulating valve 16 to move the clamp shaft 6 forward, and the clamp handle 2
1 allows advance and retreat.

Further, the clamp shaft 6 is rotatably connected to the camshaft 11 through a gear group 17, and the gear group 17 has the same rotation ratio as the gear group 10, and the work shaft 5
The clamp shaft 6 is configured to rotate at a constant speed, and both gear groups 10 and 17 are connected to the work shaft 5 by a recombination mechanism (not shown) for the gear group 17, which is configured at the inner end of the gear switching handle 18. The rotation ratio of the clamp shaft 6 to the cam shaft 11 can be changed.

A cam member 20 of the lateral feed mechanism 19 is detachably attached to the outer end of the camshaft 11.

The cam member 20 of the transverse feed mechanism 19 has a transverse feed cam 20a formed in the axial direction, which contacts a tip roller 22b provided at the end of a roller arm 22 protruding from the spindle 2, and moves the feed base 3 in the direction of arrow C. The arm guide 22a slides along an arm guide 35 fixed to the feed table, and the feed table 3 is pressed by a coil spring 23 provided on the support shaft 2.
is always elastically biased in the opposite direction to arrow C,
It is configured to slide in the lateral direction along the lateral feed cam 20a.

Further, the roller arm 22 is connected to the support shaft 2 in the axial direction via a rod of a left chamfering micrometer 24, so that the relative position of the roller arm 22 in the axial direction with respect to the support shaft 2 can be finely adjusted. I can do it.

The notch cam 20b formed in the radial direction of the cam member 20 is attached to a bracket 2 fixed to the side end of the base 1.
The roller 2 is pivotally mounted on the upper end of a sliding rod 26 which is pivotally mounted to be slidable in the vertical direction with respect to the roller 26 and fixedly supported by the screwing of the bolt 25a from below.
6a, the feed table 3 swings in the direction of arrow A about the support shaft 2, and causes the copying cam 13 to come into contact with and separate from the roller 27a of the depth of cut determining mechanism 12, and the roller 27a is connected to the base. A sliding rod 27 is pivotally attached to the upper end of the slide rod 27, which is slidable vertically via a radiating micrometer 29 with respect to a bracket 28 fixed to the side end of the radiating rod 1. be established.

Reference numeral 31 denotes a right chamfer 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.

Reference numeral 32 denotes a grindstone driving motor installed inside the base 1, and a disc-shaped grindstone 33 with diamond powder or the like fixed to the peripheral grinding surface fixed to the shaft end is connected to the work shaft 5 and the clamp shaft 6. It is located below and parallel to both axes, and is composed of a flat peripheral abrasive surface 33a and an inwardly inclined left chamfered abrasive surface 33b and right chamfered abrasive surface 33c.

Reference numeral 34 denotes a workpiece drive motor installed inside the base 1, and the workpiece drive motor 34 is rotationally connected to the camshaft 11 via a drive transmission mechanism 35 provided on the support shaft 2. It is.

The tabletop automatic centering machine with the above configuration has a workpiece axis of 5
The material to be ground a is held between the holders 7 and 8 provided at the end of the clamp shaft 6, and by turning on the grindstone drive motor 32 and the workpiece drive motor 34, the outer periphery of the material to be ground a is ground and both surfaces are chamfered. The processing is performed automatically, and its functions and effects will be explained below.

First, when the material to be ground a is to be clamped 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 retreats, and at the same time the clamp shaft 6 and holder 8 retreat.
8 opens, the clamp handle 21 is again swung in the direction opposite to arrow D so as to sandwich the workpiece a between both holders, and then the high pressure air applied to the pressure regulating valve 16 is conducted to the clamp cylinder 15. A constant pressure is applied to the grinding material, and the material to be ground a is held at a predetermined pressure.

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

Further, the amount of axial sliding of the workpiece a by the transverse feed cam 20a can be corrected by the left chamfering micrometer 24 and the right chamfering micrometer 31.

FIG. 8 is a graph showing the relationship between the displacement of the workpiece a 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, and the cam shaft 11 rotates once. By doing so, the entire grinding process is completed.

() When the camshaft 11 starts rotating, the roller 62a comes off from the protruding part of the cutting cam 20b, the work shaft 5 side of the feed table 3 moves down using the support shaft 2 as a fulcrum, and the material to be ground a is rotationally driven. It comes into contact with the grindstone 33 and starts grinding.

() At this time, the lateral feed cam 20a is in the middle position, and the workpiece a is therefore lowered onto the peripheral grinding surface 33a of the grindstone 33.

This lowering limit is determined by the contact between the outer diameter determining copying cam 13 of the depth of cut determining mechanism 12 attached to the work shaft 5 and the roller 27a, Due to the rotation, the material to be ground a is moved toward and away from the peripheral grinding surface 33a along the copying cam 13, and the outer periphery of the same shape is ground.

() Next, when the cam member 20 rotates about one third, the roller arm 2 moves along the transverse feed cam 20a.
2 is pressed, the feed table 3 moves in the direction of arrow C. Due to this movement, the right corner of the workpiece a held between the clamps 7 and 8 is ground against the right chamfering surface 33c of the grindstone 33, and this amount of grinding is for right chamfering. This is done by adjusting the rotation of the micrometer 31.

() When the cam member 20 rotates about two-thirds of a turn, the feed base 3 is pushed back along the transverse feed cam 20a by the elasticity of the coil spring 23.

Due to this movement, the left corner of the material to be ground a is ground against the left chamfering grinding surface 33b of the grindstone 33, and the amount of this grinding is adjusted by rotating the left chamfering micrometer 24. Let's do it.

() When the cam member 20 goes around once, the roller 26a
The protrusion of the cutting cam 20b comes into contact with the
Since the feed table 3 is lifted upward, the material to be ground a is separated from the grindstone 33.

At the same time, the work drive motor 34 is turned off by the limit switch, the rotation of the work shaft 5 and the clamp shaft 6 is stopped, and the finished product can be removed by tilting the clamp handle 21 as described above.

Next, FIGS. 9 to 12 show the table-top automatic centering machine to which an automatic grinding material supply mechanism 40 is added.

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

Further, reference numeral 43 denotes a workpiece storage wall erected on the upper surface of the supply table 41, and an adjustment wall 44 having an L-shaped cross section is installed parallel to the storage wall to accommodate the channel-shaped workpiece. A push shaft 47 having a push end 47a at its tip is slidably inserted into a bearing 46 that forms the groove 45 and protrudes from the rear end of the housing groove 45, and is pushed in the direction of arrow F by a coil spring 48. It is elastically biased.

Reference numeral 49 denotes a guide groove extending from the inner end of the ground material storage groove 45 to the end of the workpiece shaft 5, and has a groove width wider than the thickness of the ground material a. A notch 50 is formed into which the holders 7 and 8 are inserted, and a stopper 4 is provided at the end of the groove.
9a is fixedly installed.

Further, an extrusion member 51 that advances and retreats within the groove is inserted into the guide groove 49, and the extrusion member 51 is connected to the piston rod end of a supply air cylinder 52 that is provided to the supply table 41 so as to be orthogonal to the work shaft 5. The air cylinder 52 is fixed in place and reciprocated within the guide groove 49 due to the expansion and contraction action of the air cylinder 52.

53 is a detachment air nozzle that opens toward the holder 7.

Reference numeral 54 denotes a cutter which is pivoted in place of the grindstone 33, and the cutter 54 is attached to a cutter blade mounting plate 55.
Cutter members 56, 56 are arranged at equal intervals in the circumferential direction.
... are arranged, and each cutter member 56 has a circumferential cutting blade 57 and a chamfer cutting blade 58,
The cutter blade mounting plate 55 can be moved and adjusted in the front-rear direction, left-right direction, and radial direction.
It is configured to adjust the cutting amount for the material to be ground a.

The automatic grinding material supply device in the lens double-sided automatic centering machine having the above-mentioned structure stacks a large number of grinding materials a cut in advance into rectangular plate shapes and coils them into the housing groove 45 of the supply table 42. spring 4
The push shaft 47 is moved backward against the elasticity of the push end 47a.
After it is set between the guide groove 49 and the edge of the guide groove 49, automatic operation is started.

First, when the supply air cylinder 52 expands, the extrusion member 51 fixed to the end of its piston rod moves forward while pushing the first workpiece a located in the guide groove 49, and the stopper 49 at the end of the guide groove 49 moves forward.
A piece of material to be ground a is moved to position a and fed into 50 notches.

At the same time, the tilting air cylinder 42 is extended,
At the same time as the supply table 41 is tilted around the hinge mechanism, the guide groove 49 integral with the supply table 41 is also displaced so that the notch 50 is located between the holders 7 and 8 of the work shaft 5 and the clamp shaft 6. Become.

In the above state, the clamp shaft 6 is collected by the extension of the workpiece holding mechanism 4, and the workpiece a is clamped between the holders 7 and 8, and then the tilting air cylinder 20 is contracted and the guide groove 49 is away from both shafts 5 and 6.

Next, when the workpiece drive motor 34 rotates, the cutter 54 rotating at high speed is elastically pressed in the direction of the workpiece a, and the circumferential cutting blade 5 of the cutter member 56
The cutter 54 and the chamfering cutting blade 58 simultaneously perform circumferential cutting and double-sided chamfering of the workpiece a. When the work shaft 5 makes one revolution, the material to be ground a is cut into the same shape as the outer diameter determining copying cam 13.
At the same time, double-sided chamfering is performed.

When the work shaft 5 rotates once, the work drive motor 34
stops, the workpiece holding mechanism 4 contracts and both holders 7 and 8 open, and at the same time air is instantaneously blown out from the air nozzle 53, blowing away the workpiece a that has been processed. be.

In addition, the supply table 41 is provided with a tilting air cylinder 42.
At the same time, the supply air cylinder 52 is extended and the extrusion member 51 slides back along the guide groove 49, and at the most retracted position, the next workpiece a located in the accommodation groove 45 is It is pushed out by the elasticity of the coil spring 48 and set to the next grinding state.

By repeating the above operations, the material to be ground a is automatically fed and processed automatically, and the material to be ground is automatically fed up to the last piece set.

As explained above, the device of the present invention is configured so that the work shaft 5 that clamps the material to be ground and the clamp shaft 6 are moved in the axial and radial directions by the cam mechanism relative to the fixed rotating grindstone 33. As a result, the load on each part is reduced, so there is less distortion in each part, and accuracy is improved.

In addition, according to the present invention, since the device has a mechanism that can simultaneously perform circumferential cutting of a workpiece and chamfering on the left and right sides, it is easy to operate and can also improve grinding accuracy in terms of operation. be.

Moreover, in the apparatus of the present invention, the work shaft 5 and the clamp shaft 6 are
At the same time, with respect to the rotation speed of the camshaft 11, the material to be ground a, which is held under pressure between the work shaft 5 and the clamp shaft 6, is moved horizontally and radially relative to the grinding wheel 33. By adopting a configuration that regulates the timing, it is possible to control the grinding process of simultaneously machining peripheral surface cutting and left and right chamfering on the material to be ground a.

In addition, the cam member 20 includes a cutting cam 20b and a lateral feed cam 20a to obtain the approximate amount of movement of the feed table 3, and a copying cam 13 attached to the work shaft 5 and a radiating micrometer 29 are used to determine the amount of cutting. The left chamfering micrometer 24 provided in the axial direction is used to finely adjust the horizontal feed amount.
Since fine adjustments are made using the micrometer 31 for right chamfering, the product can be ground with extremely high precision.

Further, according to the apparatus of the present invention, by replacing the copying cam 13 attached to the work shaft 5, it is possible to automatically grind not only lenses of the same shape but also lenses of various shapes.

Furthermore, by installing the device of the present invention in an automatic double-sided centering machine, it becomes possible to completely automatically process the set material to be ground, which not only shortens the processing time but also requires almost no operator. It is.

Therefore, according to the apparatus of the present invention, the production cost of lenses, etc. to be ground can be significantly reduced, and products with stable quality can be manufactured. The effect is extremely large.

[Brief explanation of the drawing]

The drawings show an embodiment of the table-top automatic centering machine of the present invention, in which Fig. 1 is a front view, Fig. 2 is a left side view,
Fig. 3 is a right side view, Fig. 4 is a schematic plan view showing the internal mechanism of the feed base, Fig. 5 is a sectional view taken along the - line in Fig. 1, and Fig. 6 A, B, and C are front views of the copying cam. ,
Figure 7 is a perspective view of the cam member, Figure 8 is a graph showing the relationship between the cam and the displacement of the material to be ground relative to the grindstone, and
The figure is a plan view of the main part with the automatic grinding material supply mechanism installed, Figure 10 is a side view with the same part cut away, and Figure 1
1 is a front view of the cutter, and FIG. 12 is a sectional view taken along the line XI-XI in FIG. 11. 1... Base, 2... Support shaft, 3... Feeding table, 4... Workpiece holding device, 5... Work shaft, 6... Clamp shaft,
7, 8... Holder, 11... Camshaft, 12... Cutting amount determining mechanism, 13... External diameter determining copying cam, 15... Clamp cylinder, 19... Traverse feed cam mechanism, 20... Cam member, 22... Roller arm, 24 ...Micrometer for left chamfering, 29...Diametering micrometer,
31... Micrometer for right chamfering, 32... Grinding wheel drive motor, 33... Grinding wheel, 34... Workpiece driving motor, 40... Automatic supply device for ground material, 41... Supply stand, 42... Tilting air cylinder, 45... Accommodating groove , 4
7... Push shaft, 49... Guide groove, 51... Extrusion member, 5
2... Supply air cylinder, 53... Air nozzle,
a... Material to be ground.

Claims (1)

[Scope of Claims] 1. A disk-shaped grindstone 33 is rotatably driven by a grindstone drive motor 32 and is pivotally mounted on a base 1. A grinding object is placed between a work shaft 5 and a clamp shaft 6 which face each other above the grindstone. In a machine for centering and chamfering lenses, etc., which descends toward and away from a grindstone 33 while holding a material a, the work shaft 5 and clamp shaft 6 are adjusted and moved in the axial direction via a micrometer 31 at the rear end of the base 1. A feed table 3 having a U-shaped planar shape whose front end can swing freely in the vertical direction via a support shaft 2 that is pivotably mounted.
Grinding material mechanisms 14 and 15 are rotatably installed at the front end of the clamp shaft 6, respectively.
This allows the clamp shaft to move forward and backward, and both shafts 5 and 6
A gear group 10 is connected to a camshaft 11 which has a means for holding the workpiece a to be ground at a predetermined pressure between its ends, and in which the work shaft 5 and the clamp shaft 6 are each rotatably provided with respect to the feed table 3. , 17 enables the work shaft 5 and clamp shaft 6 to rotate synchronously, and at the same time regulates the rotation speed of the work shaft 5 and clamp shaft 6 relative to the rotation speed of the cam shaft 11. A cam member 20 is fixed to the side end, and the cam member 20 includes a transverse feed cam 20a with a driven surface that changes in the axial direction, and a cut cam 20b with a driven surface that projects from the lower end in the radial direction. The lateral feed cam 20a has a roller 2 at the tip of a roller arm 22 that protrudes from the support shaft 2 through a micrometer 24 in the axial direction of the cam shaft 11 so as to be slidable and adjustable.
2b, and the upper end roller 26a of the sliding rod 26 provided on the base 1 is brought into contact with the cutting cam 20b, so that the work shaft 5 and the clamp shaft are aligned relative to the rotational speed of the cam shaft 11. A copying cam 13 with a predetermined profile that can be attached to and detached from the end of the work shaft 5 is provided so as to control the timing of horizontal and lateral movement and radial swing timing of the workpiece a held between the grinding wheels 33 and the grinding wheel 33. The diameter is determined by contacting the base 1 with a roller 27a attached to the base 1 via a micrometer 29 so that the grindstone 33 can be raised and lowered in the radial direction. The work drive motor 34 mounted in the base 1 is configured to rotate at an appropriate speed via a rotation transmission mechanism via a rotation transmission mechanism, and performs cutting and lateral feeding of the workpiece holding mechanism 4 to the disc-shaped grindstone 33. A tabletop automatic centering tool for centering and chamfering lenses, etc., which is characterized by being able to perform simultaneous operations such as peripheral cutting and left and right chamfering of a material to be ground a. Machine. 3 The disc-shaped grindstone is replaceable, and the disc-shaped cutter member can be attached and removed, and the cutter member can adjust the radial position adjustment mechanism, left-right movement adjustment mechanism, and circumferential position adjustment mechanism constructed between it and the cutter attachment member. The cutter blades are pivotally mounted for fine adjustment through the cutter member, and the cutter blades formed at the tip of the cutter member include at least three types: a flat blade, a left-slanted blade, and a right-slanted blade, and are held and rotated at the clamping end. 3. The tabletop automatic centering machine according to claim 1, wherein the automatic centering machine engages with the outer periphery of the material to be ground, cuts the periphery of the material, and simultaneously performs left and right chamfering. 4 A workpiece to be ground is clamped between a work shaft and a clamp shaft that face each other above the disc-shaped grindstone that is rotatably driven by a grindstone drive motor, and the workpiece is lowered onto and separated from the grindstone. In this machine for centering and chamfering lenses, etc., the work shaft and the clamp shaft are pivoted at the rear end of the base so that they can be adjusted and moved in the axial direction via a micrometer, so that the front end can be moved vertically. Each shaft is rotatably installed on the front end of a feed table whose planar shape is U-shaped so that it can swing freely, and the clamp shaft can be moved forward and backward by a mechanism for holding the material to be ground provided on the clamp shaft. means for clamping and holding the material to be ground between both ends of the shaft at a predetermined pressure; means for raising and lowering the workpiece shaft and the clamp shaft with respect to the base via a copying cam member pivotally attached to the workpiece shaft; A tabletop automatic centering machine characterized by being equipped with an automatic grinding material supply mechanism that automatically feeds a grinding material between both work shaft ends. 5. The automatic supply device for the material to be ground connects the clamp shaft with the cylinder to advance and retreat, and connects the supply table, which is tiltably pivoted to the base via a hinge mechanism parallel to the workpiece axis, to the base. A member constituting a guide groove extending perpendicularly between the two clamping ends from the supply base via a cylinder interposed between the supply bases is swung so that its tip intervenes or interposes between the two clamping ends. , and a housing groove is formed on the supply table to be perpendicular to the rear end of the guide groove, and a push shaft elastically biased in the direction of the guide groove is inserted into the housing groove, and the push shaft is slidable in the guide groove. A movably inserted extrusion member is moved forward and backward by a cylinder provided on a supply table, and a large number of materials to be ground stored in a storage groove are fed one by one between the clamping ends along a guide groove, and the workpiece shaft is 5. The table-top centering machine according to claim 4, wherein the table-top centering machine is configured to be tilted and withdrawn after being clamped between the clamp shaft and the clamp shaft.