JPS61293714A - Forward-reverse switching mechanism - Google Patents

Abstract

PURPOSE:To form a tool in small size and light weight, by fixing an internal gear and a planet arm (gear holder) to integrally rotate planetary gears and a sun gear while fixing the gear holder to rotate the internal gear and the sun gear in the reverse direction. CONSTITUTION:When a tool is in no-load operation before tapping, rotation of a motor is transmitted as the reverse rotation to a pinion 3 in planetary gears 8. Centering is finished under this condition, and if thrust force is applied to a main unit of the tool, a gear holder 12 becomes unable to rotate, and the tool, reversely rotating the pinion 3 while rotating the planetary gears 8 and a spindle 6 in the forward direction, performs tapping. The tapping is finished, and if the main unit is pulled, the tool, moving the spindle 6 and the gear holder 12 to a point end side of the took reversely rotates the spindle 6, and a tap is extracted. Accordingly, forward-reversing switching power is efficiently transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for switching the rotational direction of a tool, which requires switching the rotational direction depending on the degree of rotation.

It rotates in the reverse direction, and when thrust is applied to the tool body, it rotates in the forward direction.It is equipped with parallel transmission shafts for the tool and reverse rotation, and the power is transmitted by a spur gear fixed to the shaft, and the final stage gears for the forward rotation and reverse rotation sides are activated. It is arranged so that it can idle on the final axis. When the spindle, which rotates integrally with the final shaft and is movable in the axial direction, is moved in the axial direction, one of the gears on the forward rotation side and the reverse rotation side on the final shaft rotates integrally with the final shaft. ing.

Therefore, when there is no load or when the main body is pulled, the final gear on the reverse rotation side rotates in the opposite direction together with the final shaft, and when thrust is applied to the main body, the final gear on the forward rotation side rotates together with the final shaft.

It has a structure that rotates in the normal direction.

Due to the above structure, the transmission shafts are parallel and 1. In addition, since spur gears are placed on both shafts, the width of the tool body becomes larger.
Furthermore, since the transmission shaft and spur gear are required for both forward and reverse directions, there is a drawback that the main body becomes heavy.

Furthermore, the forward rotation side transmission shaft system idles during reverse rotation, and the reverse rotation shaft system idles during forward rotation, and the transmission shaft system that is not necessary for the function of the tool body is operated, resulting in a structure with a lot of waste in the power transmission path. Ta.

[Object of the Invention] The object of the present invention is to - eliminate the above-mentioned drawbacks of the prior art;
The objective is to reduce the size and weight of this type of tool and provide an efficient power transmission 6V home appliance (mechanism).

[Summary of the invention]

In the present invention, if the internal gear and the planetary arm (gear holder) of the planetary gear device are fixed, the planetary gear device becomes the sun gear (pinion).
If the planetary arm (gear holder) is fixed,
Focusing on the fact that the internal gear (spindle) rotates in the opposite direction to the sun gear (pinion), the
Also, the method of fixing the gear holder alone and the relationship between the parts, springs, and auxiliary springs have been devised.

It must have the ability to rotate in the opposite direction to center the pilot hole and the tool body, rotate forward when thrust is applied to the body to start tapping, and rotate in the reverse direction to remove the tap when the body is pulled.

An embodiment of the present invention having the above functions will be described with reference to FIGS. 1, 2, and 3. In the present invention, as shown in FIG. 1, there is a first reduction section consisting of a motor pinion 1 and a gear 2, a pinion 3. Planetary gears (3 pieces)8. A planetary gear unit consisting of a spindle 6° equipped with an internal gear 9, a gear holder 12 supporting a planetary gear 8 by a needle roller 7, etc., fixed to a gear cover 22 by pins 4 and tows 5 for rotation prevention and positioning, and The motor-side dog clutch part consists of a gear holder lock 14 having a claw of the dog clutch and a motor-side wind 18 of the gear holder of the planetary gear unit, and the spindle is prevented from rotating by a groove provided in the spindle 6 as shown in FIG. A distal end bit (19) which is movable only in the axial direction on six axes and is composed of a lock piece 16 having a claw of a dog clutch and a distal end winding 19 of a gear holder of a planetary gear unit.
Hehera Sochikan? ``The floor of the seven hands Rin ε
It is composed of a spring 21 for separating Furuno rC, an auxiliary spring 20, etc.

FIG. 11 is a diagram showing the no-load operating state (or switch open state) before tapping. When the switch is closed,
The rotation of the motor is decelerated by the first reduction section and transmitted to the pinion 3 of the planetary gear device in reverse rotation. At this time, the spring 21 has a larger pressing load than the auxiliary spring 20, so the spindle 6 is pressed against the tool tip side via the gear holder 12 and the steel ball 13. Therefore, the motor-side dog clutch is in the released state, and the tip-side dog clutch is in the engaged state. Therefore, the spindle 6, which includes the internal gear 9 of the planetary gear device, and the gear holder 12, which is a planetary arm, are fixed via the lock piece 16, and cannot rotate with each other, so that the planetary gear 8 also becomes unable to rotate. As a result, the planetary gear 8, the gear holder 12, the planetary gear device parts of the spindle 6, and the lock piece 16, which are integral with the pinion 3, rotate in the reverse direction. When the centering process is completed and a thrust is applied to the tool body to start tapping, the force is applied through the spindle 6 and the steel ball 13 against the auxiliary spring 20.

The gear holder 12 is pressed against the motor side and moves.

Therefore, the motor-side dog clutch becomes engaged and the gear holder radar 12 cannot rotate.

In addition, since the tip-side dog clutch is pressed toward the tip side by the load of the lock piece 16 or the auxiliary spring 20, it does not move integrally with the spindle 6 in the axial direction and remains in the same position, so the mesh is separated. , the state is released. The binding and rotation of the pinion 3 are transmitted via a planetary gear 8 to a spindle 6 equipped with an internal gear 9. Note that the rotation direction at this time is that the ionion 3 rotates in the opposite direction, and the planetary gear 8 rotates in the opposite direction.
rotates in the forward direction, the spindle 6 rotates in the forward direction, and the reduction ratio of the planetary gear unit is the number of internal gear teeth (Zl)/the number of pinion teeth (Zl).

In the present invention, the gear holder lock 15 and the motor side dog clutch 18 of the gear holder are provided with a certain inclination so that when an overload occurs, the claws are smooth against each other and cut off power transmission. ing. When tapping is completed and the main body is pulled, the load of the auxiliary spring 20 is added, and the spindle 6 and gear holder 12 move together toward the tool tip. At this time, a washer 10 and an Okawa tomewa 11 are used on the spindle 6 so that the spindle 6 and the gear holder 12 move together in the axial direction, and the gearhog 7 radar 12 is positioned.

When moving in the axial direction, the motor-side dog clutch is released and the tip-side dog clutch is brought into mesh. Therefore, the operation of each part is the same as the tap centering process described above, the spindle v6 rotates in the reverse direction, and the tap is removed (#).

〔Effect of the invention〕

According to the present invention, since the rotation of the mold can be transmitted in both forward and reverse rotation directions on the same axis and by the same gear, the tool body can be made smaller and lighter, and the efficiency of power transmission can be increased.

Furthermore, a mating part for the claws of the motor-side dog clutch part is formed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the tapper mechanism according to the present invention, and FIG. 2 is a sectional view taken along the line I--T in FIG. 1. FIG. 3 is a sectional view taken along the line ■-π of FIG. In the figure, 1 is a motor binion and 2 is a gear. 3 is a pinion, 4 is a pin, 5 is a screw, 6 is a spindle, 7 is a needle roller, 8 is a planetary gear, 9 internal teeth M7.
10 pcs washer, 11 is Tomewa Okawa, 12 is gear holder, 13 is steel ball, 14 is gear holder lock, 1
5 is the gear holder lock claw. 16Vi lock piece, 17 is lock piece pawl, 18 is gear holder motor side wind, 19 is gear holder tip side pawl, 20 is auxiliary spring, 21 is Sufu' IJ song 2
2 is a gear cover, and 23 is a spindle groove. Name of patent applicant Hitachi Koki Co., Ltd. Figure 2 - +> 3 indentations

Claims (1)

[Claims] The spindle at the tip of the tool rotates in the opposite direction during no-load operation, rotates forward when thrust is applied to the tool body and begins drilling, tapping, etc., and rotates in the reverse direction when the body is pulled up after the work is completed. The switching mechanism includes a pinion that is a sun gear of a planetary gear device, meshing with the pinion, supporting the planet gear of the planetary gear device by a needle roller, and a meshing clutch on both sides of the support arm of the planet gear. A gear holder having a claw portion formed therein, a spindle having an internal gear inside the gear holder and meshing with the planetary gear, and a chuck for attaching an optical end tool fixed to the tip thereof, and a spindle that is fitted with the spindle and rotates integrally with the spindle. and a lock piece that slides in the axial direction and can be freely engaged with and disengaged from the tool tip side pawl of the gear holder by thrust to the main body, and switches the spindle and the gear holder to either integral rotation or relative rotation; A gear holder lock is fixed to the gear cover on the main body side of the gear holder and engages with a motor-side pawl of the gear holder due to a thrust load to the main body, and is disposed between the spindle and the lock piece. an auxiliary spring that urges the lock piece toward the tool tip side and disengages the gear holder and the lock piece when a thrust load is applied; A forward/reverse switching mechanism comprising a spring configured to bias a gear holder toward a tool tip side and disengage the claw engagement between the gear holder and the gear holder lock when no load is applied.