JPH0131392Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a locking device for a tap breakage prevention mechanism in a tapping drilling machine.

In a tapping drilling machine that uses a tap to perform screw tapping, if the tap blade becomes worn or the diameter of the pilot hole is small, the torsional stress generated in the tap becomes large, and if it exceeds a certain value, the tap will stop working. will break. Conventionally, the mechanism for preventing tap breakage in tapping drilling machines has generally been the first one.
As shown in the figure, the driven gear part is a friction clutch type, and elastic loads such as compression coil springs are adjusted to change the transmission torque of the clutch. If the transmission torque exceeds a predetermined value during tapping, slipping occurs, and the tap or main shaft There is a device that stops the rotation of the For example, in the figure, when tapping an M4 screw, the set height of the compression coil spring is adjusted to _H1 , and when tapping an M5 screw, the spring compression amount is adjusted to _H2 , thereby changing the transmitted torque. In this case, if the machine has the ability to tap screws from M4 to M16, for example, taps larger than M10 have a large breakage torque and will hardly break, so the adjustment range is set to M4 to M8. If you are using a tapping or drilling machine that can also perform drilling operations, the above device must be locked, otherwise the cutting torque will be large and the clutch will become stuck when tapping or drilling relatively large diameter screws such as M10 to M16. There is a problem that slipping occurs in the parts, making it impossible to perform the specified processing. For this reason, it was necessary to tighten the pressure nut in order to increase the clutch pressure load, that is, the spring load, which not only significantly worsened work efficiency, but also caused problems such as the tightening force being inconsistent depending on the operator. I had a problem.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to ensure the fixation of this type of tap breakage prevention mechanism, and to significantly improve the operability.

The present invention focuses on the fact that the tap breakage prevention mechanism is locked when the gear wheel and the clutch member are connected with a connecting member (pin), and the device is activated when they are separated.
The relationship between the deck wheel, clutch member, and connecting member has been devised.

A specific example of the present invention will be explained with reference to FIGS. 2 and 3.

A sleeve 4 having a male thread 2 on the outer diameter portion of the upper end and a spline hole 3 on the inner diameter portion of the other end is supported on the head 1 by a bearing 5. The sleeve 4
A clutch member 7 is fixed to the outer diameter portion via a key 6 or the like. Bearing 8 on clutch member 7
The inner ring of the bearing 8 is fitted, and the outer ring of the bearing 8 is fitted with a V-belt 9 for transmitting power from an electric motor (not shown).
A gear wheel 10, which is engaged with, is supported as shown.

The contact surface A between the clutch member 7 and the stepped wheel 10 is formed by a compression coil spring 12 that is displaced by tightening a pressing nut 11 that engages with the male screw 2 of the sleeve 4.
are pressed together. A main shaft 13 having a spline shaft is fitted into the spline hole 3 of the sleeve 4, and the main shaft 13 is held by a support cylinder 14 having a roughened outer part, and the support cylinder 14 is supported by the head 1. . There is a chuck 16 at the tip of the main shaft 13.
A machining tool such as a tap 15 is fixed thereto.

A pin 18 is disposed in a hole 17 drilled in the tray wheel 10, and a spring 19 presses the pin 18 downward.
A member 20 is fixed above the pin 18, and this member 20 is loosely fitted into a groove 21 cut in the upper surface of the stepped wheel 10. Part 2
A handle 22 that can be pulled upward by hand is fixed to the handle 0, and a pin 18 is also fixed as shown in the figure.

A hole 23 is provided on the top surface of the stepped wheel 10 into which a fixing pin can be inserted when the pin 18 is lifted upward and rotated.
has been deleted. The clutch member 7 is also provided with one or more holes 24 into which the pin 18 can be inserted.

The functions and functions of the above configuration will be described in detail.

The state shown in FIG. 2 is for work that does not require a clutch function to prevent tool breakage, such as drilling work or large-diameter screw tapping work, in which the pin 18 connects the clutch member 7 and the deck wheel 10. There is. In this state, in order to activate the function of breaking a tap using a clutch such as a small-diameter tap, lift the member 20 with the handle 22, that is, lift the pin 18 to remove the pin 18 from the clutch member 7, and then rotate the handle 22. If the fixing pin part is inserted into the hole 23 provided on the top surface of the gear wheel 10, the pin 18 will not be inserted into the hole 24 of the clutch member again even if the load of the spring 19 is applied, and the gear wheel 10 will be The clutch mechanism operates without the member 20 moving or falling into the groove 21 even when the centrifugal force is applied when rotated by an electric motor. If you do not want to operate the clutch mechanism again, lift the member 20 using the handle 22, remove the fixing pin from the hole 23, rotate the member 20, align the member 20 with the groove 21, and place it there. is pressed against the A side. When tapping is performed in this state, the clutch is activated and the main shaft 13, that is, the clutch member 7, stops, but the stepped wheel 10 rotates. When the pin 18 of the gear wheel 10 fits into the hole 24 of the clutch member 7, the pin 18 is pressed by the spring 19 and is automatically inserted into the hole 24 of the clutch member 7, thereby locking the clutch mechanism. .

In the embodiment described above, the pin is fixed by rotation, but there are various sliding methods for fixing the pin, and since this can be easily done by a mechanical engineer, a detailed explanation will not be given.

Further, the clutch member may be provided with several more holes, and in this case, since the holes correspond to the pins, the rotation angle becomes smaller, and the operability can be further improved.

According to the present invention, when the clutch member, main shaft, or sleeve is fixed and the gear wheel is rotated at least once, the pin installed on the gear wheel is inserted into the hole in the clutch member, and the gear wheel and the clutch member are connected. The fixing operation of the tap breakage clutch has been significantly improved, and there are no operational problems due to variations in the tightening force of the pressing nut, especially when drilling and tapping are performed alternately.
This is an excellent idea that can significantly improve work efficiency when working with large diameter taps and small diameter taps alternately.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing a clutch part for preventing tap breakage of a conventional tapping drilling machine, Fig. 2 is a longitudinal sectional view showing a locking device of the tap breakage prevention mechanism of the present invention, and Fig. FIG. In the figure, 1 is the head, 2 is a male screw, 3 is a spline hole, 4 is a sleeve, 5 is a bearing, and 6
is the key, 7 is the clutch member, 8 is the bearing, 9
is a V-belt, 10 is a stepped wheel, 11 is a pressing nut, 1
2 is a compression coil spring, 13 is a main shaft, 14 is a support tube, 15 is a tap, 16 is a chuck, 17 is a hole,
18 is a pin, 19 is a spring, 20 is a member, 2
1 is a groove, 22 is a handle, 23 is a hole, and 24 is a hole.

Claims (1)

[Scope of utility model registration request] A clutch member is fixed to a sleeve that has a male thread on the outer diameter part of the upper end and a spline hole connected to the main shaft on the inner diameter part of the other end, and the clutch member has a stepped wheel that is engaged with a V-belt for transmitting power from the electric motor. The contact surface between the clutch member and the stepped wheel has a clutch pressed by a compression coil spring that is displaced by tightening a pressing nut that engages with the male thread of the sleeve, and is fixed to the tip of the main shaft by this clutch. In a tapping drilling machine that has a means for preventing breakage of the tapped taps, a pin is slidably disposed in a hole drilled in the stepped wheel via a resilient force such as a compression coil spring, and a clutch member is provided with a pin attached to the stepped wheel. The lower part of the arranged pin is inserted by the pressing load of the compression coil spring,
One or more holes are drilled through which the clutch function can be fixed by connecting with the deck wheel, and above the pin there is a means for pulling up the pin, and when the pin is pulled up, the pin separates from the clutch member and maintains the separated state. A tap breakage prevention mechanism in a tapping drilling machine which has a means and performs a clutch function.