JPS5954828A - Clutch device for motor-driven tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a clutch mechanism that determines the tightening torque of a power tool that can automatically tighten a screw, bolt, or nut.

゛Conventional configuration and one point in between.Conventional power tools have a shut-off type clutch mechanism that tightens screws with a constant torque, and when the screw tightening torque reaches a set value, the clutch mechanism moves away, but the rotation side (
This causes a discrepancy in the height of the rotating blade in the clutch mechanism between the motor side) and the fixed side (Pino I side).

In the conventional Clara Chi mechanism as shown in Section 2-,
If the driving force is not cut off at the highest point of separation (top dead center), the motor suddenly stops at this point, resulting in the state shown in FIG. 3, which has the disadvantage of not being able to self-return.

;A' :: il 5ite large, 7ka, 7.7
1 rere, 9 so chime π on one side of the opposite part: 'Klp
1. To cause a slippage: to cause a fall, force, force, etc.) to stop at top dead center.

The present invention provides a clutch mechanism that completely eliminates this.

The present invention has a structure that has a force/shaft that directly receives the force of the drive source, and a mechanism that fits into this shaft and has a rotational play or a pawl groove that engages with each other in the direction of rotation. A ring cam and a dangerous cam thII part 1! It is fitted into the ring cam and is non-rotatingly coupled with the ring cam via a steel ball... The torque response is 9.
``Lite, Guka'' vs. /%, /□
- It has the unique effect of preventing the rig from stopping at the neutral point when the rig moves against each other.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an outline of a power tool including an embodiment of the present invention, in which A represents the machine of the present invention (clutch portion including n;
is the reducer part, and with the motor C, press the bit 1 of the clutch □ part' A tip i onto the screw.
Interposed in the center hole of reducer part B and motor C ζ:22:'I[
-, [; 工8;h 7. ;) % n'i', ! ＞
9. 33 The motor C is rotated by supplying 2 degrees of gauze.
6 is a switch for changing the rotation direction of the motor C, and 6 is an exterior cover.

, the first implementation □ example is shown. In FIG. 4, '7 is a camshaft, and the ring cam 8 is fitted onto this camshaft. L - Having a rising and falling ball 9 in its groove...The merging 16 is slidably fitted onto the camshaft 7. A bit holder 11 fits into the center hole of the cam ni1+7, and a spring 12 is interposed between it and the cam shaft 7. The bit holder 11 has a pawl receiver 14 that slides in the axial direction but whose rotational direction is regulated by a steel ball 13.
It is designed to engage with a pawl 10a at one end of the 0.

A reset lock 16 is energized between the pawl receiver 14 and the retaining ring 16 near the center of the pin holder 11. A lock spring 19 is enclosed between the camshaft 7 and the camshaft bushing 18 that is fully inserted into the camshaft 7, and the left end surface of the lock cam 17 is inserted into the center hole of the pinot holder 11. A switch rod is inserted into the lock cam 170, which extends to the glue mint switch 3 in FIG.

Reference numeral 21 denotes a clap case that covers the clutch section, and a thrust bearing 22. A torque spring 24 is biased through spring seats 23, 6, 23/1-2. 251. Torque tensioner (no. 1) screwed onto the comb, socket, and s. 2.6 is: 7. with a ring fitted on its left end. , Iratch case: Several pins 27 in the clutch case 21 press the spring I9!!'237 as the nut moves. 28 is a clutch case. 521 (a knob that fits and interposes a knob 29 between it, is fixed to the clutch case 21 with a steel ball 30, and a bushing 31 is press-fitted to the tip; book; 31 is fitted with a retaining ring 32. 33 is the knob 2"
8 is a retaining ring, 34 is a solid ring for each camshaft, and 35 is a steel ball for stopping the bit 1 from being removed. Bit 1
When the screw is pressed against the screw, the claw 14a of the claw holder and the claw 10a of the hammer ring 10 now engage. At this time, the limit switch 3 is activated by the movement of the switch rod 2, and the motor C is rotated.

As shown in FIG. 5, when the screw (orally speaking) reaches a certain l·lux, bit 1. Bit holder 11 and claw holder 1
4 stops, but the motor C continues to rotate, so the pivoting force is transmitted through the reducer section B.
The transmission is transmitted to the shaft 7, which also rotates the ring cam 8, causing the steel ball 9 to climb the cam crest 8a of the ring cam 8, and the merging 10 moves in the direction of arrow a. Push back 14. At this time, 20 steel balls
is moved by the pressure of the lock spring 19 that presses the lock cam 17, and enters the hole of the pawl receiver 14. At this time, the switch 2d returns to its original position and the limit switch 3 is stopped. As shown in FIG. 6, the nozzle ring 10 does not climb the cam ridge 8a and moves in the direction indicated by the arrow. On the other hand, nail receiver 14 nails, Tlj 2
Since it is not possible to return to the original position due to the action of claw 1,
0a.

14. The mesh of a is out of alignment. In this state, the transmission of the driving force to the bit 1 is completely cut off.

The seventh chest shows the state in which the steel ball 9 has climbed the cam mountain 8a of the ring cam 8, but the ring cam 8 and the cam l11
1+7 are meshed with each other with some play in the rotational direction, and when the camshaft 7 rotates in the direction of arrow C, the surface 7a of the camshaft 7 and the surface 8b of the ring cam 6 come into contact, exerting force on the steel ball 9. It is moved along the mountain 8a.

At the moment when the steel ball 9 has finished climbing the mountain 8a, the steel ball 9 is now in the trench.
1. The rotational force applied to the ball 9 is released, and the ring cam 8 is swung in the direction of arrow d by the reaction force given by the inertia force. On the other hand, the paulownia ball 9 tries to roll in the direction of the arrow e in the opposite direction to the ring cam 8, and the steel ball 9 cannot be stopped at the top dead center position F.

This prevents the clutch from stopping at the neutral point.

Next, a second example of I/C will be shown. In FIG. 8, reference numeral 36 denotes a spring stretched between the cam shaft 7 and the ring cam 8. When tightening the screw, the spring 36 is pulled so that the faces a and 8b come into contact with each other, and the steel ball 9 is held at the position where the cam ridge 8a is shown by the dashed line. cam mountain 8a
This movement is carried out, but the moment it is exceeded, the elastic force of the spring 36 returns it to its original position, and the steel ball 9 is operated so as to be removed from the top of the cam crest. This prevents the clutch from stopping at the neutral point.

In the conventional example shown in FIGS. 2 and 3, the camshaft 7' has a cam ridge 8'a on its circumferential surface and moves the steel ball 9' in the radial direction. When the steel ball white' reaches the top of the cam ridge 8a, it moves away from the drive source at a point q, which is integrated with the cam ridge 8'a. A state in which the steel ball 9' is caught between the ring 1d! , becomes 1.

For this reason, a neutral point stop occurs.

Effects of the Invention As described above, the conventional camshaft is divided into a ring-shaped cam having cam ridges in the axial direction and a shaft that holds this, and the ring-shaped cam and the shaft are provided with a margin in the direction of rotation. interlocking,
Or, by applying the elastic force of a spring between the two, we can eliminate the need to stop at the neutral point of a torque-responsive clutch that disengages according to the torque when tightening a screw, and reduce the use of unreliable power tools. There is something about it that increases its practical effectiveness.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention, and Fig. 2 is a cross-sectional view showing the torque responsive clutch section of a conventional example, and Fig. 3 is a cross-sectional view taken along・X sectional view, FIG. 4 is a full sectional view of the clutch part A in FIG. 1, FIG. 5 is a sectional view showing when the torque responsive clutch is disengaged, FIG. 6 is a sectional view when torque is cut off, and FIG. 7 FIG. 8 is a partial sectional view showing a neutral point stop position, and FIG. 8 is a partial sectional view of a torque responsive clutch showing a second embodiment. 7...Cam shaft, 8...Ring cam, 9
・・・・・・Steel ball, 1o・・・Hammer ring,
11...Bit holder. -112...Return spring, 14...Claw holder, 16...Reset spring, 17...
...Lock cam, 19...Lock cam, 2o
...Steel ball, 2; ...Clutch case,
24... Torque is 31? I...Spring. =149 Figure 5 Figure 6 Figure 7 Figure 8 8b8 9

Claims (1)

[Claims] (1) A camshaft, a ring cam that is fitted to the camshaft and rotates integrally with the camshaft while regulating the rotational direction, and a steel ball that is fitted to the camshaft and is interposed between the ring cam and the ring cam. The rotatably connected hammer ring and the center hole of the camshaft -
a bit holder for holding an end tool; a slidable pawl holder rotatably coupled to the bit holder;
It is inserted into the center hole of the camshaft and bit holder.
The radially spaced side of the rJ Tsuku cam and the bit holder (a steel ball interposed therein, a lock spring that resets the base of the lock cam, a reset spring that presses one end of the pawl holder, and the cam A return spring tensioned between the shaft and the bit holder, a torque spring 7 that presses the hammer ring against the ring cam, and a Clara that covers the whole (2) A camshaft between the camshaft and the ring, !f cam. and the ring cam move relative to each other in the direction of rotation.