JP3455417B2 - Tapping device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tapping device, and more particularly, to a tapping device that facilitates switching of a tap rotation direction.

[0002]

2. Description of the Related Art A motor for tapping with a frame having an electromagnet at the bottom (a motor having a tap attached through a universal joint chuck (hereinafter referred to as a chuck))
There is known a tapping device capable of performing tapping (screwing) with the frame being fixed to a workpiece by the electromagnet.

FIG. 9 is a diagram showing a conventional tapping device. The frame 2 is fixed on the electromagnet 1,
A plate 3 is slidably fixed to the frame 2. A motor 5 is supported by a clamp 4 provided near the lower end of the plate 3, and a chuck 6 is attached to the tip of the motor 5. A tap 6a is attached to the chuck 6. The plate 3 is set to be slidable in the feed direction and the return direction of the tap 6a.

A handle 8 for rotating a shaft 7 connected to the plate 3 is fixed to the frame 2 via a gear mechanism (not shown). The rotation of the handle 8 is transmitted to the plate 3 by the gear mechanism, and the plate 3 moves up and down with respect to the frame 2.

The motor 5 is provided with a switch 9, and by switching the switch 9, the rotation direction of the motor 5 is switched. The on / off switch of the electromagnet 1 is generally provided on the frame 2. Power for this tapping device is supplied through a cord 10 with a plug.

In the tapping work by this type of tapping device, first, the electromagnet 1 is set on the workpiece and positioned, and the electromagnet 1 is energized to adsorb the electromagnet to the workpiece and tapping is performed. Secure the device. Then, the motor 5 is energized to perform tapping work on the workpiece. The handle 8 is used to lower the motor 5
It is done by manual operation.

[0007]

In the tapping device, when the fed tap is returned, the motor 5 has to be rotated in the reverse direction. In the tapping device described above, the rotation direction of the motor 5 can be changed by switching the switch 9 provided on the motor 5. However, in this tapping device, while operating the handle 8 of the main body (frame) 2 with one hand, Since the switch 9 must be operated with the other hand, there is a problem that the operation becomes complicated.

In order to eliminate the complexity of the operation, it is possible to automatically reverse the rotation of the motor. For example, a structure in which a clutch is provided inside the motor 5 and the clutch is switched depending on the direction of the force acting on the tap to switch the rotation direction of the tap can be considered. However, the motor 5
If a clutch is provided inside the motor, the structure of the motor 5 becomes complicated and the cost increases. Therefore, there is a problem in that the motor cannot be made versatile by being used in other electric tools that do not require such a clutch, such as a punching machine.

Further, a limit switch is arranged in accordance with a preset depth of the tap hole, and when the limit switch detects that the tap has been delivered by a predetermined amount, the motor is reversely rotated to return the tap. A structure in which the direction is rotated is also conceivable. However, the limit switch must be set every time the depth of the tapping hole in the workpiece changes, and if you want to return the tap before machining to the planned depth, you can manually change the tap rotation direction. It had to be changed, and there was a problem that the complexity was not solved.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a tapping device capable of switching the rotation direction of a tap at any position during tapping operation by a simple operation. .

[0011]

SUMMARY OF THE INVENTION To solve the above problems and to achieve the object, the present invention provides a motor for rotating a tap, a frame for supporting the motor so that the motor can move up and down, and a gear for moving the motor up and down. A device and a tapping device having a handle for driving the gear device,
A pinion shaft for transmitting the rotation of the handle to the gear device, and one of a meshing clutch fixed to the handle and provided slidably in the axial direction and the circumferential direction with respect to the pinion shaft. , The other of the dog clutches fixed to the pinion shaft and one of the dog clutches displaced to the first axial position when the handle is rotated in the feed direction of the tap, When one of the dog clutches is rotated in the return direction of the tap, one of the dog clutches is moved to the second axial direction.
A cam switch that displaces to a position and a toggle switch that is provided corresponding to one of the meshing clutches and that rotates the motor forward in the first position and reversely rotates the motor in the second position; fixed to one of the clutch have, includes a switch ring having an annular groove in a circumferential direction, the toggle with the displacement of the switch ring
It is characterized in that the operating lever of the toggle switch and the annular groove of the switch ring are engaged so that the switch can be switched.

According to this feature, when the handle is rotated in the feed direction of the tap, that is, in the direction in which the tap is fed into the workpiece, one of the dog clutches is displaced to the first position and the operation lever of the toggle switch is switched. Ring of rings
Engages with the groove , and the toggle switch follows the switch ring that is displaced with one of the dog clutches,
It is switched to rotate the motor in the forward direction, that is, in the tapping direction of the tap. On the other hand, when the handle is rotated in the return direction of the tap, one of the dog clutches is displaced to the second position and the motor is rotated in the reverse direction, that is, the direction opposite to the thread cutting. That is, if the handle is rotated in the feed direction of the tap, the tap attached to the motor rotates in the thread cutting direction, and if the handle is rotated in the return direction of the tap, the tap attached to the motor rotates in the direction opposite to the thread cutting. In this way, the rotation direction of the tap follows the operating direction of the handle and is automatically switched.

[0013]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 2 is a side view showing the configuration of the tapping device according to the present invention, and the same reference numerals as those in FIG. 9 denote the same parts. In the figure, a switch box 12 holding a toggle switch 11 is attached to the surface of the frame 2. The operation lever of the toggle switch 11 is exposed to the outside from the switch box 12, and the contact portion, the wiring terminal portion, and the like are housed inside the switch box 12. The toggle switch 1
The operation lever 1 is engaged with a later-described ring member (switch ring) provided slidably in the longitudinal direction of the shaft (pinion shaft) 7 rotated by a handle 8. .

The toggle switch 11 is a switch means for determining the rotation direction of the motor 5, and is switched in conjunction with a switch ring which slides in the longitudinal direction of the shaft 7 following the operation of the handle 8.

FIG. 1 is a sectional view of a main part of a tapping device for explaining a feed mechanism for moving the motor 5 up and down. A guide rail engaging with the plate 3 is partially broken to show the periphery of the pinion shaft 7. It is the figure shown in detail. In the same figure, the guide rails 13 fixed to the dovetail groove of the frame 2 are provided on the plate 3 “Available”
It has a guide surface 14 for guiding (not shown).

Behind the guide rail 13 (the plate 3
A pinion shaft (hereinafter, simply referred to as “shaft”) 7 arranged so as to penetrate the frame 2 is provided on the opposite side). The shaft 7 has a pipe shape and is rotatably supported by bushes 15 and 16 press-fitted into the frame 2. A pinion 17 is arranged at an intermediate position between the bushes 15 and 16, and the pinion 17 has a pin 18
It is fixed to the shaft 7 by. A spacer 19 is provided between the pinion 17 and the bush 16.

A first clutch ring 20 is provided at the end of the shaft 7, and the first clutch ring 20 has a pin 2
It is fixed to the shaft 7 by 1. The second clutch ring 22 paired with the first clutch ring 20 is provided slidably with respect to the shaft 7 in the longitudinal direction and the circumferential direction of the shaft 7. The second clutch ring 22 is fitted in the boss 23, and the boss 23 is fitted in the switch ring 24. The handle bar 8 a of the handle 8 is screwed into the boss 23.

The second clutch ring 22, the boss 23,
The switch ring 24 is fixed to each other by a pin 25 to form an integrated assembly (switch ring assembly). That is, this switch ring assembly is slidable with respect to the shaft 7 via the second clutch ring 22. A compression coil spring 26 is arranged between the switch ring 24 and the bush 16, and the first clutch ring 2
The switch ring 24, that is, the switch ring assembly is urged in the direction in which the 0 and the second clutch ring 22 are engaged with each other. A washer 31 is provided on the end surface of the compression coil spring 26. A ring 27 is fixed to the outer circumference of the switch ring 24 with a screw 28, and a scale plate 29 serving as a guide for knowing the feed amount of the tap is attached to the outer circumference thereof.

A groove 30 is formed on the outer circumference of the switch ring 24 in the circumferential direction of the switch ring 24.
The tip of the operation lever of the toggle switch 11 built in the switch box 12 is engaged with 0. This engagement state will be described later with reference to FIGS.

The order of assembling the feeding mechanism will be described. First, the shaft 21 and the first clutch ring 2 are fixed by the pin 21.
0 and united. Next, the second clutch ring 22, the boss 23, and the switch ring 24 are fixed to each other with a pin 25 to form a switch ring assembly. Ring 27
Is fixed to the outer circumference of the switch ring 24 with a screw 28. However, the fixed position of the ring is finally adjusted.

The switch ring assembly is mounted on the shaft 7, and the compression coil spring 26 and the washer 31 are mounted on the shaft 7. Subsequently, the shaft 7 is attached to the bush 1.
Insert in 5,16. At this time, the spacer 19 and the pinion 17 are also mounted on the shaft 7. Finally, pin 18
The pinion 17 is fixed to the shaft 7 by and the cap 32 is fitted into the frame 2.

Next, the engagement state of the toggle switch 11 and the switch ring 24 will be described. FIG. 3 is an enlarged cross-sectional view of an essential part showing an engaged state of the toggle switch 11 and the switch ring 24, and FIG. 4 is a cross-sectional view at the X position of FIG. In both figures, the toggle switch 11 is fixed to the upper surface of the switch box 12 by a bolt portion 11a of the toggle switch 11 and nuts 11b and 11c. The operation lever 11d of the toggle switch 11 has its tip fitted in the groove 30 of the switch ring 24,
The switch ring 24 swings following the displacement of the switch ring 24 in the arrow A direction. By swinging the operation lever 11d, the contact of the switch is switched according to the swing position. The toggle switch 11 is electrically connected so that the motor 5 rotates normally when the operation lever 11d is tilted to one side, and reversely rotates when the operation lever 11d is tilted to the other side, and the motor 5 is stopped at its neutral position.

In operation, first, the tap 6a is aligned with the pilot hole, and a power switch (not shown) for fixing the electromagnet 1 to the workpiece is turned on. The power switch is preferably provided on the frame 2, but is not particularly limited. After the power is turned on, the handle 8 is rotated in a predetermined direction (feed direction) for feeding the tap into the workpiece. The rotation is transmitted from the second clutch ring 22 to the first clutch ring 20, and the shaft 7 rotates. As a result, the pinion 17 rotates and a rack (not shown), which is one of the gear units fixed to the plate 3 engaged with the pinion 17, is driven, and the plate 3 is displaced toward the workpiece. . That is, the motor 5 is displaced and the tap is fed into the prepared hole of the workpiece. When the handle 8 is rotated in the feed direction, the motor 5 is rotated in the threading direction by tapping (forward rotation) in conjunction with the rotation of the handle 8.

On the other hand, when the handle 8 is rotated in the direction for removing the tap from the workpiece (return direction), the pinion 1
The plate 3 is displaced in the return direction by the rotation of 7. At this time, the motor 5 is rotated (reversely rotated) in the direction opposite to the threading by tapping in association with the rotation of the handle 8.
The rotation of the motor 5 is automatically stopped in the middle of switching from the normal rotation to the reverse rotation or from the reverse rotation to the normal rotation. The rotation of the handle 8 and the rotation of the motor 5 are linked to each other by the first clutch ring 20 and the second clutch ring 22.
This will be achieved by meshing with, but the details will be described later.

Next, the engagement state of the first and second clutch rings 20 and 22 and the movement of the switch ring 24 for achieving the interlocking will be described. FIG. 5 is a development view of the first clutch ring 20. The second clutch ring 2
The development view of No. 2 is the same as that of the first clutch ring 20, and is omitted. As shown in FIG. 5, the first clutch ring 20 has a cam surface formed on a surface facing the second clutch ring 22, that is, a meshing surface. The cam surface has a bottom surface 20a, a first inclined surface 20b, an intermediate surface 20c, a second inclined surface 20d, a top surface 20e, a forward torque transmission surface 20f, and a reverse torque transmission surface 20g.

FIG. 6 shows the first and second clutch rings 2
It is a principal part development view which shows the engagement state of 0 and 22. In the same figure (a), the compression coil spring 26 has the switch ring
In the most compressed state, the second clutch ring 22 is rotated in the arrow F direction (forward direction) by the operation of the handle 8, and the first and second clutch rings 20, 22 are in the forward direction at the first position. The torque transmission surfaces 22f are in contact with each other. From this state, when the handle 8 is further rotated in the same direction, the first clutch ring 20 rotates in the positive direction, the pinion 17 rotates, and the plate 3 urged by the pinion 17 is tapped. Is displaced in the feeding direction of. When the positive direction torque transmission surfaces 20f and 22f are in contact with each other, that is, in the first position, the operation lever 11d of the toggle switch 11 connects the contacts of the switch 11 so as to rotate the motor 5 in the forward direction.

When the handle 8 is operated in order to return the tap, the second clutch ring 22 is rotated in the direction of arrow R (reverse direction), and the forward torque transmitting surfaces 20f, 2 of each other are rotated.
2f is separated, and the edges of the top surfaces 20e and 22e slide on the other second inclined surfaces 22d and 20d, respectively. Then, at the intermediate position, the top surfaces 20e, 22e have the other intermediate surface 22c,
20c respectively (FIG.6 (b)). In this position, the operation lever 11d of the toggle switch 11 is set to the motor 5
The contact of the switch 11 is connected so as to stop the switch.

When the handle 8 is further operated in the return direction, the edges of the top surfaces 20e and 22e slide on the other first inclined surfaces 22b and 20b, respectively. And the top surface 20
e and 22e contact the other bottom surfaces 22a and 20a, respectively (FIG. 6C). In this position, toggle switch 1
The operation lever 11d of No. 1 connects the contacts of the switch 11 so as to rotate the motor 5 in the reverse direction.

When the handle 8 is further operated in the returning direction from the state shown in FIG. 6 (c), the first and second clutch rings 20, 22 come into contact with the reverse torque transmitting surfaces 22g, 20g at the second position. The first clutch ring 20 rotates in the opposite direction to rotate the pinion 17, and the plate 3 biased by the pinion 17 is displaced in the tap returning direction.

When the handle 8 is rotated in this way,
The switch ring 24 is displaced in the longitudinal direction of the shaft 7 while rotating in the circumferential direction of the shaft 7. Then, the toggle switch 11 is switched according to this displacement, the motor 5 is driven so that the tap rotates forward when the handle 8 is rotated in the feed direction, and the tap is performed when the handle 8 is rotated in the return direction. The motor 5 is driven to rotate in reverse. At the intermediate position between the normal rotation and the reverse rotation, the rotation of the motor 5, that is, the rotation of the tap is stopped.

FIG. 7 shows a motor 5 and a toggle switch 1.
It is an enlarged view for demonstrating arrangement of the lead wire for electrical connection between 1 and 1. In the figure, a cabtire cord (at least 6 cores) is provided between the motor 5 and the toggle switch 11.
It is connected at 33. The midway of the cabtire cord 33 is fastened to the handle portion 2a of the frame 2 with the fastener 34, the end portion is fixed to the cover plate 2b of the frame 2 with the receptacle 35, and the extension portion from that is connected to the terminal of the toggle switch 11. It is connected.

FIG. 8 is a wiring diagram of the motor 5 and the toggle switch 11. In the figure, the connection between the rotor 36 and the stator coil 37 is switched via the contact of the toggle switch 11. During normal rotation, that is, the operating lever 1
When 1d is tilted to the predetermined forward rotation side, the contact c of the toggle switch 11 is connected to the contact a. When the operation lever 11d is displaced to the neutral position,
The contact c is connected to the idle contact d. Further, during reverse rotation, that is, when the operation lever 11d is tilted in the direction opposite to the normal rotation side, the contact c of the toggle switch 11 is connected to the contact b.

As described above, in the present embodiment, the toggle switch 11 is switched by the switch ring 24 that is displaced integrally with the handle 8, but the present invention is not limited to this. In short, it suffices to provide a component that is displaced in the longitudinal direction of the shaft 7 in accordance with the operation of the handle 8 and determine the forward / reverse rotation direction of the motor 5 according to the position of the component. For example, an annular protrusion may be formed around the periphery instead of the groove 30, and the protrusion may be detected by a limit switch or a reed switch. Also,
The connection of the motor 5 is not directly switched by a toggle switch or the like, but a relay may be operated by a toggle switch or the like and the rotation direction of the motor 5 may be switched by opening / closing a contact of the relay.

[0034]

As is apparent from the above description, according to the present invention, the rotating direction of the tap is automatically switched in accordance with the operating direction of the handle. Therefore, the worker
Tapping can be performed easily by simply operating the handle, and the tap can be returned at any position.

[Brief description of drawings]

FIG. 1 is a main-portion cross-sectional view showing a tap feed mechanism portion of a tapping device according to an embodiment of the present invention.

FIG. 2 is an overall view of a tapping device according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a main part of a tapping device showing an engaged state of a toggle switch and a switch ring.

FIG. 4 is a cross-sectional view of the switch ring showing an engaged state of the toggle switch and the switch ring.

FIG. 5 is a development view showing the shape of a cam surface formed on the clutch.

FIG. 6 is a development view showing meshing of clutches.

FIG. 7 is a side view of a main part of the tapping device showing a cord routing state.

FIG. 8 is a connection diagram of a motor and a switch.

FIG. 9 is an overall view of a conventional tapping device.

[Explanation of symbols]

2 ... Frame, 7 ... Pinion shaft, 8 ... Handle, 11 ... Toggle switch, 11d ... Operating lever,
12 ... switch box, 15, 16 ... bush,
20, 21 ... Clutch, 23 ... Boss, 24 ... Switch ring, 26 ... Compression coil spring, 30 ... Annular groove

Claims (3)

(57) [Claims] 1. A tapping device having a motor for rotating a tap, a frame for supporting the motor so as to be able to move up and down, a gear device for moving the motor up and down, and a handle for driving the gear device, wherein rotation of the handle is A pinion shaft for transmitting to one rack, which is a gear device fixed to the frame, and an engagement fixed to the handle and slidably provided in the axial direction and the circumferential direction with respect to the pinion shaft. One of the clutches, the other of the dog clutches fixed to the pinion shaft, and one of the dog clutches displaced to the first axial position when the handle is rotated in the tap feed direction. When the handle is turned in the return direction of the tap, one of the dog clutches is moved in the axial direction. A cam means for displacing the second position, provided in correspondence with one of the dog clutch, wherein in the first position rotated forward the motor, wherein in the second position and the toggle switch to reverse rotation of said motor, It is fixed to one of the above-mentioned mesh clutches and the ring is
A switch ring having a groove, and the switch ring together with one of the dog clutches.
As the lugs are displaced to the first and second positions
Toggle the toggle switch so that it toggles.
Tapping device being characterized in that engaged with the operating lever of the Switches and the annular groove <br/> of the switch ring. 2. The toggle switch is configured to stop the motor when one of the dog clutches is displaced to an intermediate position between the first position and the second position by operating the handle. The tapping device according to claim 1, wherein: Wherein said cam means, tapping device according to claim 1 or 2, characterized in that said meshing one and the other cam formed on mating surfaces of the clutch.