JPS6244312A - Tap slip confirming device - Google Patents

Abstract

PURPOSE:To enable confirmation through a simple structure while to prevent disconnection of limit switch wiring by providing a tap slip confirming plate folded perpendicularly to be in parallel with the axis of spindle. CONSTITUTION:A sleeve 31 is stopped through a semi-circular key 32 in the shaft hole at the tip of spindle 14 to fit a movable shaft 30 integral with a tap holder 16 slidably in the axial direction and to push in the advancing direction through a spring 35. Then the spindle 14 is indexed through gang head 12 at the machining position bored through a drill 15 and upon advance of a gang head 12, the intermediate gear 20 is geared with the gear shaft 36 through rotary indexing corresponding with a limit switch 28 against a dog 29 thus to advance a screw 18 throuth the spindle 14. Upon insufficient biting of breakdown of a tap, the tap 17 will never advance but only rotate to absorb advance of the spindle 14 through relative displacement of a movable shaft 30 against the sleeve 31. Here, the tap slip confirmation plate 24 is displaced around the shaft 25 to function the limit switch 28.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a slip confirmation device for a tap used in tapping.

<Prior art> In a processing device that automatically taps a hole in a workpiece to tap it, a fourth device is used as a device to check for tap slippage when the tap has poor bite or is broken. As shown in the figure, the gigang head 4
A tap holder 42 is attached to the tip of a spindle 41 which is rotatably supported on the spindle 41 in the rotational direction, and is provided so as to be relatively displaceable in the axial direction when the tap slips. A tap slip confirmation plate 45, which is fixed and relatively rotatable and is interposed between the tip of the spindle 41 and the rear end of the tap holder 42 and pressed toward the rear end of the tap holder 42 by a spring 47, is attached to the support plate. 44 to axis 4
6, the block 49 is pivotally supported so as to be displaceable in the axial direction of the spindle 41, and the block 49 is slidably guided to a guide shaft 48 fixed to the fixed surface 51 with an axis parallel to the spindle 41. The support plate 44 is always engaged with the block 49, and a tap slip confirmation limit switch 50 that comes into contact with the back surface of the tap slip confirmation plate 45 is installed. The advancing spindle 2 and the tap slip confirmation limit 50 on the block 49 are advanced in synchronization, and the tap slip confirmation plate 45 is stopped by stopping the tap holder 43 despite the advance of the spindle 41 that occurs when the tap 43 slips. The tap slip confirmation limit switch 50 is activated to confirm the tap slip at the backward displacement of the tap slip.

<Interset point to be solved by the invention> According to the above-mentioned conventional device, a complicated mechanism is required to synchronize the limit switch 50 for tap slip confirmation with the forward movement of the spindle 41, and the tap slip confirmation limit switch 50 that moves forward and backward is required. There is a risk that the wiring of the limit switch 50 may be disconnected.

In order to solve the above conventional problems, the present invention provides a tap holder at the tip of a spindle that moves forward and backward in the axial direction while being rotated by a master screw. A bracket is supported on the spindle so as to be relatively rotatable in the axial direction when the tap slips, and the bracket is interposed between the tip of the spindle and the rear end of the tap holder. A tap slip confirmation plate that is displaced by the relative displacement of the spindle is pivoted, one end of the tap slip confirmation plate is bent parallel to the axis of the spindle, and the tap slip confirmation plate is operated by the displacement of the tap slip confirmation plate. A limit switch is fixed at a position corresponding to the bent portion of the tap slip confirmation plate and at a position corresponding to the tap engagement space.

Function> In the present invention, the bent portion of the tap slip confirmation plate contacts the tap slip confirmation limit switch disposed on the fixed side from the start point of tap biting until the completion of machining. The tap slip confirmation limit is actuated by the displacement of the tap slip confirmation plate at .

Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 3. In FIG. 1, 10 is a processing head, and 11 is a drive shaft supported by the processing head 10, which can move forward and backward in the axial direction as well as index and rotate. 12 is a gearing head fixed to the drive shaft 11. A pair of spindles 13 and 14 are rotatably supported on the gearing head 12 along axes parallel to the axis of the drive shaft 11, which are divided vertically (or left and right) around the axis of the drive shaft 11. One spindle 13 is a drilling spindle with a drill 15 attached to its tip, and the other spindle 14 moves forward and backward while rotating in the axial direction with the lead of the master screw 18.
A tap holder 16 with a tap 17 attached to its tip engages in the rotational direction, and is a screw tapping spindle provided so as to be relatively movable in the axial direction.

As shown in FIG. 3, the coupling structure between the spindle 14 and the tap holder 16 is as shown in FIG.
The movable shaft 3 integrated with the tap holder 16 is attached to this sleeve 31.
0 is slidably fitted in the axial direction. And sleeve 3
A long groove 33 in the axial direction is formed in the sleeve 31 , and a pin 34 passing through the movable shaft 30 in the diametrical direction is slidably engaged with the long groove 33 . This configuration includes a spring 35 that presses the forward direction.

The rotational drive mechanism of the spindles 13 and 14 is as follows. A rotating shaft 19 that is rotated forward and backward by a circuit motor is provided concentrically within the drive shaft 11, and a gear shaft 36 spline-coupled to this rotating shaft 19 is supported on the gearing head 12. One spindle I3 for hole making is
It meshes with the gear shaft 36 via an intermediate gear, and rotation is constantly transmitted thereto. The tapping spindle 14 is spline-coupled to a gear shaft 38 supported on the gearing head 12, and this gear shaft 38 is an intermediate gear that anastomoses with the gear shaft 36 and shifts in the axial direction to release the mesh. 20
Rotation is transmitted through.

Reference numeral 21 designates a shift lever for the intermediate gear 20, which is fixed to a forward/backward shaft 22 supported on the gearing bed 12 so as to be movable forward and backward along an axis parallel to the spindle 14. When the gearing head 12 indexes and rotates and reaches a predetermined angular position, the advance/retreat shaft 22 is moved forward by the cam of the circuit, disengaging the intermediate gear 20 from the gear shaft 36, and disengaging the intermediate gear 20 from the gear shaft 36.
This is to cut off the rotational transmission of No. 4.

Next, the main configuration of the present invention will be explained. Spindle 14
The bracket 37 is supported while allowing relative rotation. A tap slip confirmation plate 24 interposed between the tip of the spindle 14 and the rear end of the tap holder 16 is pivotally supported on this bracket 37 by a shaft 25 so as to be movable in the front and rear direction,
This tap slip confirmation plate 24 and bracket 3
A spring 26 is interposed between the tap slip check plate 24 and the spindle 14 to normally press the tap slip confirmation plate 24 into a position that is properly perpendicular to the axis of the spindle 14. A bent portion 14a is formed at the end of the tap slip confirmation plate 24 in parallel to the axis of the spindle 14, and a dog 29 having a surface parallel to the axis of the spindle 14 is attached to this bent portion H14a. It is being

Further, a tap slip confirmation limit switch 28 is provided on a bracket 27 fixed to the machining head 10 at a position corresponding to the dog 29 from the start point of tap biting to the completion of machining.

In addition, in FIG. 1, 23 is an operating shaft, and the rotating shaft 19
．． It passes through the axis of the gear shaft 36 so as to be able to slide in the axial direction, and its tip is connected to the bracket 37, and its rear end confirms the engagement of the tap provided at the rear of the processing head 10 and the completion of tapping. It is compatible with limit switches.

Since the present invention has the above-described structure, the tapping spindle 14 is positioned by the index rotation of the gearing head 12, as shown in FIG. 1, at the processing position drilled by the drill 15 in the previous step. Next, when the gearing head I2 is moved forward together with the drive shaft 11, the dog 29 attached to the tap slip confirmation plate 24 corresponds to the tap slip confirmation limit switch 28.

Further, the forward/backward shaft 22 is disengaged from the cam of the circuit by the rotational indexing operation of the gearing head I2, and is moved backward by the spring force, and the intermediate gear 20 is engaged with the gear shaft 36 by the shift lever 21, and screwed against the spindle I4. Rotation in the direction is transmitted.

As a result, the spindle 14 rotates while the master screw 1
Move forward with the lead of 8. This spindle I4
With the forward movement, the tap slip confirmation plate 24 is pushed by the tip of the spindle 14 and moves forward together with the bracket 37. On the other hand, the tap 17 bites into the hole to be tapped and performs the tapping process. Here, the forward movement of the tap 17 is stopped due to poor engagement of the tap 17 or the tap is broken, and the tap 17 only rotates. As a result, continued forward movement of the spindle 14 is absorbed by displacing the movable shaft 30 relative to the sleeve 31. At this time, the tap slip confirmation plate 24 is displaced around the shaft 25 as shown in FIG. 2, and the dog 29 operates the tap slip confirmation limit switch 28 to confirm the tap slip. .

<Effects of the Invention> As described above, according to the present invention, one end of the tap slip confirmation plate disposed on the spindle is bent parallel to the axis of the spindle, and the end of the tap slip confirmation plate arranged on the spindle is bent parallel to the bent portion and from the start of tap biting. The limit switch for checking tap slip is fixed to the fixed side of the processing head at the corresponding position until tapping completion, so it is no longer complicated to move the limit switch for checking tap slip in synchronization with the advance of the spindle as in the past. Eliminates the need for a mechanism,
It can be arranged with a simple structure, and there is no risk of disconnection of the wiring connected to the tap slip confirmation limit switch.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the device of the present invention, Fig. 2 is a cross-sectional view of main parts showing the tap slip confirmation state, Fig. 3 is a cross-sectional view showing the coupling structure between the spindle and the tap holder, and Fig. 4 is a cross-sectional view of the conventional device. It is an explanatory diagram. 14...Spindle, 16...Tap holder, 18
..., Master screw, 24...Tap slip confirmation plate, 25...Shaft, 27...Bracket, 28
... Limit switch for tap slip confirmation, 37.
··bracket.

Claims (1)

[Claims] A tap holder is attached to the tip of a spindle that moves forward and backward in the axial direction while being rotated by a master screw, and is engaged with the spindle in the rotational direction, and is provided so that it can be relatively displaced in the axial direction when the tap slips, and the bracket is supported relatively rotatably on the spindle. A tap slip confirmation plate, which is interposed between the tip of the spindle and the rear end of the tap holder and is displaced by relative displacement between the spindle and the tap holder, is pivotally supported on this bracket, and one end of the tap slip confirmation plate is Bend it so that it is parallel to the axis of the spindle, and place a limit switch for tap slip confirmation, which is activated by displacement of the tap slip confirmation plate, at a position corresponding to the bent part of the tap slip confirmation plate and between the taps. A tap slip confirmation device, characterized in that it is fixed at a position corresponding to.