JPH04372345A - Bench type drill pointing machine - Google Patents

Abstract

PURPOSE:To perform the correct positioning of a drill into a set position or a grinding position with simple operation in a drill pointing machine for feeding a turntable horizontally and a grinding wheel vertically. CONSTITUTION:A frame 2 is provided with a moving body 4 in the horizontally movable state. A turntable 5 provided with a chuck and a chuck wrench 8 is installed on the moving body 4, and the turntable 5 is rotated by a table driving motor 10. A grinding wheel driving motor 32 is installed on an elevated body 31 to rotate a grinding wheel 34. The frame 2 is also provided with a moving control member 24 so as to dispose the turntable 5 into a grinding position or a set position. A base plate 35 is provided with a positioning member 37 for positioning the blade tip of a drill blade 6 in the set position of the turntable 5. There is further provided a switch for stopping the table driving motor 10 in the set position and starting it in the grinding position. A correcting member 28 is slid interlockingly with the chuck wrench 8 so as to automatically correct the set position of the turntable 5.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill grinder for grinding the tip of a worn drill blade, and more particularly to a tabletop drill grinder.

0002

[Prior Art] Conventionally, as this type of tabletop drill grinding machine, for example, Japanese Patent Publication No. 64-1273 and Japanese Utility Model Publication No. 5
A technique disclosed in Japanese Patent No. 3-47275 is known. A conventional drill grinder is configured such that a drill blade is gripped by a chuck on a turntable, a grindstone is rotated and sent horizontally and vertically, and the tip of the drill blade is ground by the grindstone. When setting the drill blade, press the power button to energize the solenoid, push the stopper close to the grindstone to position the tip of the drill blade, then press the activation button to demagnetize the solenoid and retract the stopper from the grindstone. After that, the grinding wheel is driven to start grinding.

0003

[Problems to be Solved by the Invention] However, since the conventional drill grinding machine is configured to set the drill bit by moving the stopper, it is necessary to excite and demagnetize not only the solenoid that drives the stopper but also the solenoid that drives the stopper. In order to do this, it is necessary to provide two buttons, and to increase the vertical stroke of the grindstone to avoid interference between the grindstone and the stopper, which not only complicates the setting mechanism but also makes operation difficult, and when setting the drill blade. However, there was a problem in that it was easy to cause erroneous operations, such as forgetting to move the stopper to the normal position and inserting the drill bit too far. SUMMARY OF THE INVENTION An object of the present invention is to provide a tabletop drill grinding machine that can accurately position a drill at a setting position and a grinding position by simple operations.

0004

[Means for Solving the Problems] In order to solve the above-mentioned problems, the tabletop drill grinding machine of the present invention includes a movable body provided on the frame so as to be movable horizontally, and a movable body that rotates around a vertical axis on the movable body. A turntable that can be supported, a table drive motor that rotates the turntable, a chuck that holds the drill blade vertically on the turntable, a grindstone that grinds the tip of the drill blade on the underside of the chuck, and a grindstone that A grindstone drive motor that rotates, a horizontal feed mechanism that sends the drill blade horizontally as the turntable rotates, a vertical feed mechanism that sends the grindstone vertically as the turntable rotates, and a turntable that moves the turntable to one operating position. a movable operating member disposed in a grinding position and a set position in the other operating position;
It consists of a positioning member that positions the tip of the drill blade at the set position, and a switch means that stops the table drive motor at the set position and starts it at the grinding position. Further, the tabletop drill grinding machine of the present invention is provided with a correction member that corrects the set position of the turntable in conjunction with the chuck.

[0005]

[Operation] According to the drill grinding machine of the present invention, the turntable is placed in the set position and the grinding position by one movable operating member, so the operating mechanism is easily constructed and its handling is extremely easy. There is no risk of erroneous operation. When the turntable is placed in the set position, the table drive motor is automatically stopped by the switch means;
The tip of the drill blade is positioned by a positioning member. In this state, when the turntable is placed in the grinding position, the table drive motor is automatically started by the switch means, and as the turntable rotates, the turntable is moved horizontally by the horizontal feed mechanism. , the grindstone is moved vertically by the vertical feed mechanism to grind the tip of the drill blade. Furthermore, since the set position of the turntable is corrected by a correction member that is linked to the chuck, it can be applied to a wide range of drill diameters, from small diameters to large diameters, regardless of the diameter of the drill.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to the drawings. As shown in FIG. 1, a pair of left and right frames 2 are attached to a housing 1 of a drill grinder, and a movable body 4 is supported between each frame 2 via a guide rod 3 so as to be horizontally movable. A turntable 5 is installed on the movable body 4 so as to be rotatable around a vertical axis, and a chuck 7 and a chuck driver 8 for vertically gripping a drill blade 6 are disposed in the center thereof, and is provided with a gear 9. A table drive motor 10 for rotationally driving the turntable 5 via a gear 9 is installed on the lower surface of the moving body 4. A first switch 11 as a switch means for starting and stopping the table drive motor 10 is attached to one end of the moving body 4.
An operating piece 20 for turning the switch 11 on and off is attached to the frame 2.

A horizontal feed cam 12 is carved on the bottom surface of the turntable 5 along a gentle elliptical curve, and has a maximum radius portion 13 and a minimum radius portion 14 at four positions approximately 90 degrees apart. are provided alternately, and a recess 15 is formed in the middle of these toward the center of the turntable 5. A notch 19 is provided on the outside of the recess 15 so as to open to the outer peripheral surface of the turntable 5. A vertical feed cam 16 is formed on the outer periphery of the turntable 5, and has a peak portion 17 and a valley portion 1 at two positions approximately 180 degrees apart.
8 are provided adjacent to each other, and the radius gradually decreases as it progresses from one peak 17 to the other trough 18.

The horizontal feed cam 1 is mounted on one frame 2.
A cam follower 21 that engages with the drill bit 2 is pivotally supported, and the cam follower 21 and the horizontal feed cam 12 constitute a horizontal feed mechanism that feeds the drill blade 6 in the horizontal direction as the turntable 5 rotates. The frame 2 is provided with a protrusion 22 that is engaged with the notch 19, and this protrusion 22 and the notch 19
It is configured such that the turntable 5 can be stopped at a predetermined rotational position. A manual moving operation member 24 equipped with a lever 23 is rotatably and slidably supported by a screw mechanism 25 on the frame 2 . Movement operation member 2
4, a tension rod 26 is inserted through the spring 27,
Its tip is hooked to the lower surface of the moving body 4. A correction member 28 is joined to the lower surface of the turntable 5 so as to be slidable in the radial direction, and its inner end is engaged with the chuck driver 8, and its outer end is protruded into the recess 15 of the horizontal feed cam 12. The degree of protrusion of the horizontal feed cam 12 into the recess 15 changes depending on the rotation angle of the turntable 8, and thereby the set position of the turntable 5 changes.

A rod 30 is erected below the chuck 7, and an elevating body 31 is attached to the rod 30 by a spring 3.
It is supported so as to be able to rise and fall while being biased upward by 9,
A grindstone drive motor 32 is installed on the elevating body 31. A grindstone 34 for grinding the cutting edge of the drill blade 6 is directly connected to the output shaft 33 of the grindstone drive motor 32 so as to rotate around a horizontal axis. A second switch 29 for starting and stopping the grindstone drive motor 32 is attached to the end of the movable body 4 opposite to the first switch 11. As shown in FIGS. 1 and 4, a base plate 35 is horizontally fixed to the upper end of the rod 30, and the base plate 35 has an opening 36 through which the upper part of the grindstone 34 is inserted. A positioning member 37 having a planar triangular shape is fixed within the opening 36, and can regulate the vertical position of the drill blade 6, as well as the axial center position and rotational position in a horizontal plane. A smooth plate 38 is fixed to the upper surface of the elevating body 31.

As shown in FIGS. 5 to 9, a fixed body 40 is attached to the lower surface of the movable body 4 above the grindstone drive motor 32, and a tilting body 42 is supported by a pin 41 on one side of the fixed body 40. A turntable 5 is provided at the upper end of the tilting body 42.
A cam follower 43 that engages with the vertical feed cam 16 is pivotally supported. A swinging body 45 is connected to the other side of the fixed body 40 by a pin 44, and a rotating body 47 having a downwardly inclined surface 46 is connected to the arm portion thereof by a shaft 48. A support arm 50 is supported at the lower end of the tilting body 42 via a support shaft 49 so as to be rotatable up and down, and the pin 44 is disposed in the middle thereof.
A long hole 51 is formed through which the elongated hole 51 is inserted, and a plurality of engagers 52 that engage with the smooth plate 38 of the elevating body 31 are rotatably supported at the tip by a shaft 53. The vertical feeding cam 16, the cam follower 43, the engaging element 52, and the like constitute a vertical feeding mechanism that feeds the grindstone 34 in the vertical direction as the turntable 5 rotates.

An adjustment rod 55 and a regulation rod 56 are screwed together on the fixed body 40, and the base end of the adjustment rod 55 is connected to an adjustment knob 57 provided on the frame 2, and also to the regulation rod 5.
The base ends of 6 are respectively connected to the regulating knobs 58 of the frame 2. The tip of the adjustment rod 55 is connected to the universal joint 5
The rotating body 47, the adjusting rod 55, and the adjusting knob 57 constitute an adjusting means that adjusts the amount of vertical feed of the grindstone 34. The tip of the regulating rod 56 is in contact with the swinging body 45 . Note that the universal joint 59 can also be omitted.

Next, the operation of the drill grinder constructed as described above will be explained. FIG. 2 shows the state when setting the drill blade 6, in which the movable body 4 and the turntable 5 are arranged at the set position on the movable operation member 24 side, and the first switch 1
The first and second switches 29 are each turned off, and the table drive motor 10 and the grindstone drive motor 32 are stopped. Then, the cam follower 21 is connected to the horizontal feed cam 12.
The protrusion 22 is engaged with the recess 15 of the notch 19 .
These engaged states are held by the springs 27 of the movable operating member 24, and the turntable 5 is stopped at a predetermined rotational position.

In this set position, FIGS. 4 and 6
As shown in the figure, the center of the chuck 7 is located directly above the positioning member 37, so by inserting the drill blade 6 into the chuck 7 and slightly rotating it, you can adjust the vertical position of the cutting edge as well as the axis position in the horizontal plane. and the rotational position are simply and accurately determined by the positioning member 37. In this state, when the chuck turner 8 is operated, the drill bit 6 is gripped by the chuck 7, but at this time, the correction member 28 (see FIG. 1) that contacts the cam follower 21 in the recess 15 moves in conjunction with the chuck 7. Since the turntable 5 is slid inward, the turntable 5 is moved outward by the biasing force of the spring 27. Therefore, the distance between the axis of the drill blade 6 and the positioning member 37 is set to the optimum distance for the diameter of the drill blade to be set, and a drill blade of any diameter can be accurately positioned.

[0014] When the drill blade 6 is set in the chuck 7 in this manner, the moving operation member 24 is then rotated in one direction. Then, as shown in FIG. 3, the moving operation member 24 is retracted by the screw mechanism 25 and the tension rod 26
The turntable 5 is moved to the grinding position via the grinding position, and the engagement between the cam follower 21 and the recess 15 and the engagement between the protrusion 22 and the notch 19 are disengaged. Just before the turntable 5 is placed in the grinding position, both the first switch 11 and the second switch 29 are turned on, and the table drive motor 10 and the grindstone drive motor 32 are started. As the turntable 5 rotates, the turntable 5 is guided by the cam follower 21 according to the shape of the horizontal feed cam 12 and moved in the horizontal direction. Horizontal feed cam 1
2 has a pair of maximum radius portion 13 and minimum radius portion 14, respectively.
Since this is formed, the turntable 5 is reciprocated twice per rotation.

As shown in FIG. 7, as the turntable 5 rotates, the cam follower 43 of the vertical feed mechanism is displaced by the vertical feed cam 16, the tilting body 42 is tilted, and the support arm 50 is moved approximately horizontally. The engaging element 52 is guided by the inclined surface 46 of the rotating body 47 and is displaced in the vertical direction. Then, the elevating body 31 is moved up and down by the engaging element 52 via the smooth plate 38, and the grindstone 34 is moved up and down together with the grindstone drive motor 32. Since a pair of peaks 17 are formed on the vertical feed cam 16, the grindstone 34 is reciprocated up and down twice for each rotation of the turntable 5. Furthermore, since the peak portion 17 is formed at a position corresponding to the maximum radius portion 13 of the horizontal feed cam 12, when the grindstone 34 is pushed down the most downwardly, the drill blade 6 is closest to the grindstone 34 in the horizontal direction. , with this as the base point, the drill blade 6 and the grindstone 34 each rotate 2 times per rotation of the turntable 5.
As the drill blade 6 is reciprocated, the pair of cutting edge surfaces of the drill blade 6 are ground by the grindstone 34 at a predetermined cutting edge angle.

Therefore, according to the drill grinding machine of this embodiment, the cutting edge of the drill blade 6 is ground by the horizontal feed of the turntable 5 and the vertical feed of the grindstone 34.
The horizontal feed mechanism includes a horizontal feed cam 12 and a cam follower 21.
In addition, the vertical feed mechanism can be easily configured from the vertical feed cam 16, the cam follower 43, the engager 52, etc., and compared to a conventional grinding machine configured to feed only the grindstone in both directions, the feed The number of interlocking parts of the mechanism can be significantly reduced, making it possible to manufacture the entire device at low cost and in a small size.

To adjust the amount of vertical feed of the grindstone 34, the adjustment knob 57 is rotated to rotate the rotating body 47 via the adjustment rod 55, as shown in FIG. By doing this, the angle of the inclined surface 46 of the rotating body 47 is changed, and the engaging element 52
The amount of vertical movement of is adjusted. Therefore, by setting an appropriate angle according to the diameter and clearance angle of the drill bit 6,
It becomes possible to grind the drill blade 6 with an appropriate depth of cut. Further, as shown in FIG. 9, if the regulating knob 58 is rotated to tighten the swinging body 45 with the regulating rod 56, the adjustment rod 55 is restricted from rotating relative to the fixed body 40.
By holding the inclined surface 46 at a set angle, the depth of cut can be maintained at an optimal value.

When the grinding work is completed, the moving operation member 24
is rotated to the opposite side and projected from the frame 2. Then, the spring 27 of the moving operation member 24 acts to urge the moving body 4 toward the set position via the tension rod 26, and when the turntable 5 rotates to the position shown in FIG. The turntable 5 is engaged with the recess 15 to be placed at the set position, and the protrusion 22 is engaged with the notch 19 to hold the turntable 5 at that position. In conjunction with this operation, the first switch 11 and the second switch 29 are turned off, and the table drive motor 10
And the grindstone drive motor 32 is automatically stopped. Therefore, the turntable 5 can be placed in the set position and the grinding position by operating one moving operating member 24, and the operating mechanism can be configured more easily than in the past, which required operating two buttons. It is extremely easy to operate and there is no risk of erroneous operation.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be embodied by appropriately changing the shape and structure of each part without departing from the spirit of the present invention. It is also possible to rotate the chuck around a vertical axis instead of around a horizontal axis, or to attach a lever to the chuck turner so that the chuck can be operated with one finger.

[0020]

As described in detail above, according to the invention of claim 1, the drill blade is accurately positioned between the set position and the grinding position by one movable operating member, so that the operating mechanism can be easily operated. It has excellent effects in that it can be configured, is extremely easy to handle, and can avoid erroneous operations.

According to the second aspect of the invention, the set position of the turntable is corrected by the correction member that is linked to the rotation angle of the chuck, so that the positional relationship between the center of the drill blade and the positioning member is adjusted according to the set position of the set drill. This has the effect of correcting the spacing to an appropriate level according to the diameter of the blade.

[Brief explanation of drawings]

FIG. 1 is a front view of a tabletop drill grinding machine showing one embodiment of the present invention.

FIG. 2 is a plan view showing the tabletop drill grinding machine of FIG. 1 when the turntable is placed in a set position.

3 is a plan view of the tabletop drill grinder of FIG. 1 when the turntable is placed in the grinding position; FIG.

FIG. 4 is a cross-sectional view taken along line A-A in FIG. 1 showing the positioning mechanism.

FIG. 5 is a partial bottom view of FIG. 1 showing the vertical feed mechanism.

[Figure 6] B in Figure 2 showing the vertical feed mechanism and positioning mechanism
- It is a sectional view along the B line.

[Figure 7] C in Figure 3 showing the vertical feed mechanism and positioning mechanism
- It is a sectional view along line C.

FIG. 8 is a partial front view of FIG. 1 showing the vertical feed amount adjustment mechanism.

[Fig. 9] Fig. 1 showing another operating state of the vertical feed amount adjustment mechanism
FIG.

[Explanation of symbols]

1. Housing, 2. Frame, 3. Guide rod, 4. Moving object, 5. Turntable, 6. Drill blade, 7. Chuck, 8. Chuck turning, 9. Gear, 10...Table drive motor, 11...First switch, 12...Horizontal feed cam, 13...Maximum radius part, 14
...Minimum radius portion, 15..Concave portion, 16..Vertical feed cam, 17..crest portion, 18..trough portion, 19..notch, 20..
・Operating piece, 21...Cam follower, 22...Protrusion, 23
... Lever, 24.. Movement operation member, 25.. Spiral mechanism, 26.. Tension rod, 27.. Spring, 28.. Correction member, 29.. Second switch, 30.. Rod, 31.
・Elevating body, 32... Grinding wheel drive motor, 33... Output shaft,
34... Grindstone, 35... Base plate, 36... Opening, 37...
Positioning member, 38...Smooth plate, 39...Spring,
40... Fixed body, 41, 44... Pin, 42... Tilting body, 43... Cam follower, 45... Rocking body, 46... Inclined surface, 47... Rotating body, 48, 53... Axis, 49 ... Support shaft, 50 ... Support arm, 51 ... Long hole, 52 ... Engagement element,
55: Adjustment rod, 56: Regulation rod, 57: Adjustment knob, 58: Regulation knob, 59: Universal joint.

Claims (2)

[Claims] 1. A movable body provided on a frame so as to be horizontally movable; a turntable supported on the movable body so as to be rotatable around a vertical axis; a table drive motor for rotationally driving the turntable; and a turntable. A chuck that grips the drill blade vertically on the top, a grindstone that grinds the tip of the drill blade on the bottom of the chuck, a grindstone drive motor that rotates the grindstone, and a grindstone that rotates the drill blade horizontally as the turntable rotates. A horizontal feed mechanism that sends the grindstone to
a moving operating member that positions the turntable in a grinding position at one operating position and a set position at the other operating position; a positioning member that positions the tip of a drill blade at the set position; and a stopper for the table drive motor at the set position. A tabletop drill grinding machine characterized in that it further comprises a switch means that is activated at the grinding position. 2. The desktop drill grinding machine according to claim 1, further comprising a correction member that corrects the set position of the turntable in conjunction with the chuck.