JPH0551407B2 - - Google Patents

Description

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

<Prior art> In a processing device that automatically taps a hole in a workpiece to tap a screw, this device is used as a device to check for tap slippage when the tap has poor bite or is broken. For example, as shown in FIG. 4, a tap holder 42 is attached to the tip of a spindle 41 rotatably supported on a gearing head 40.
is engaged with the spindle 41 in the rotational direction and relatively displaceable in the axial direction during tap slip, and a support plate 44 is attached to the spindle 41 so as to be relatively rotatable while restraining movement in the axial direction, and the tip of the spindle 41 and the tap holder 42 The tap slip confirmation plate 4 is interposed between the tap holder 42 and the rear end and pressed toward the rear end of the tap holder 42 by a spring 47.
5 is pivotally supported on the support plate 44 by a shaft 46 so as to be displaceable in the axial direction of the spindle 41, and a block 49 is slidable on a guide shaft 48 fixed to a fixed surface 51 with an axis parallel to the spindle 41. The block 49 and the support plate 44 are always engaged with each other, and the block 49 is provided with a tap slip confirmation limit switch 50 that comes into contact with the back surface of the tap slip confirmation plate 45. The spindle 2 moves forward by a master screw that is
and the tap slip confirmation limit 50 on the block 49 are moved forward in synchronization, and despite the advance of the spindle 41 that occurs when the tap 43 slips, the tap holder 43 stops and the tap slip confirmation plate 45 moves backward to cause the tap slip. This was confirmed by operating the confirmation limit switch 50.

<Problems to be Solved by the Invention> According to the conventional device described above, a complicated mechanism is required to synchronize the tap slip confirmation limit switch 50 with the forward movement of the spindle 41.
Furthermore, there is a risk that the wiring of the tap slip confirmation limit switch 50, which moves forward and backward, may be disconnected.

<Means for Solving the Problems> In order to solve the above-mentioned conventional problems, the present invention provides a machining head with a gearing head that is rotatably indexable, a drill spindle rotatably supported on the gearing head, and a tap. A tap spindle is supported by a master screw so that it can move forward and backward in the axial direction while rotating, and a tap holder is provided at the tip of the tap spindle to engage with the tap spindle in the rotational direction and to be relatively displaceable in the axial direction when the tap slips. A tap slip that supports a mounting member on the tap spindle so as to be relatively rotatable, and is disposed on the mounting member between the tip of the tap spindle and the rear end of the tap holder and is displaced by relative displacement between the tap spindle and the tap holder. A confirmation plate is pivoted, one end of the tap slip confirmation plate is bent so as to be parallel to the axis of the tap spindle, and a tap is placed on this bent portion in the dimensional width from the start point of the tap to the completion of machining. A tap-slip confirmation limit switch, which is operated via the dog by displacement of the tap-slip confirmation plate, is fixed to the machining head via a bracket at a position corresponding to the dog. This is what I did.

<Function> According to the present invention, the bent portion of the tap-slip checking plate contacts the tap-slip checking limit switch disposed on the fixed side from the tap-biting start point to the completion of machining, so that the tap-slip checking plate at the time of tap-slip The tap slip confirmation limit is activated by the displacement of the tap slip.

<Examples> Examples of the present invention will be described below with reference to FIGS. 1 to 3. In FIG. 1, 10 is a machining head, and 11 is a drive shaft supported by the machining head 10, which can move forward and backward in the axial direction and rotate for indexing. Reference numeral 12 denotes a gearing head fixed to the drive shaft 11. This gigantic head 12
A pair of spindles 13 and 14 are rotatably supported on 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 1
3 is a spindle for drilling with a drill 15 attached to its tip, and the other spindle 1
4 moves forward and backward as it rotates in the axial direction by the lead of the master screw 18, and a tap holder 16 with a tap 17 attached to its tip engages in the rotational direction and is relatively movable in the axial direction. This is a spindle for tapping a screw.

The coupling structure between the spindle 14 and the tap holder 16 is as shown in FIG. A movable shaft 30, which is integral with the movable shaft 30, is fitted so as to be slidable in the axial direction. Then, 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, and between the inside of the sleeve 31 and the end of the movable shaft 30. This configuration includes a spring 35 that presses the tap holder 16 in the forward direction.

The rotational drive mechanism of the spindles 13 and 14 is as follows. A rotary shaft 19 is concentrically provided within the drive shaft 11 and is rotated forward and backward by a motor (not shown), and a gear shaft 36 spline-coupled to the rotary shaft 19 is supported on the gearing head 12. One spindle 13 for drilling is connected to the gear shaft 3
6 through an intermediate gear, and rotation is constantly transmitted. The tapping spindle 14 is spline connected to a gear shaft 38 which is supported on the gearing head 12, and this gear shaft 38 is connected to the small gear 20a of the intermediate shaft 20 which is supported on the gearing head 12.
It meshes with the The intermediate shaft 20 has an intermediate gear 20b.
are spline-coupled, and by shifting the intermediate gear 20b in the axial direction, the intermediate gear 20b can mesh with or disengage from the gear shaft 36. Reference numeral 21 denotes a shift lever of the intermediate gear 20, which is fixed to a forward and backward shaft 22 which is supported on the gearing head 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 forward and backward shaft 22 is moved forward by a cam (not shown), and the intermediate gear 20
is disengaged from the gear shaft 36, and the spindle 14
This is to cut off rotational transmission.

Next, the main configuration of the present invention will be explained. A mounting member 37 is supported on the spindle 14 while allowing relative rotation. The spindle 14 is attached to this mounting member 37.
A tap slip confirmation plate 24 interposed between the tip of the tap holder 16 and the rear end of the tap holder 16 is pivotally supported by a shaft 25 so as to be movable in the front and back direction, and a spring 26 is inserted between the tap slip confirmation plate 24 and the mounting member 37. The tap-slip confirmation plate 24 is interposed therebetween and is normally pressed into a position that is properly orthogonal 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.
A dog 29 having a surface parallel to the axis of the spindle 14 is attached to the shaft with a dimension width from the tapping start point to the completion of machining.

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

In FIG. 1, reference numeral 23 denotes an operating shaft, which passes through the axes of the rotary shaft 19 and the gear shaft 36 so as to be able to slide in the axial direction, and its front end is connected to the mounting member 37, and its rear end is machined. This corresponds to a limit switch provided at the rear of the head 10 that confirms the engagement of the tap and the completion of tap machining.

Since the present invention has the above-described structure, the tapping spindle 14 is positioned at the processing position where the hole was drilled by the drill 15 in the previous process by indexing rotation of the gearing head 12, as shown in FIG. . Next, when the gearing head 12 is advanced together with the drive shaft 11, the tap slip confirmation plate 2
The dog 29 attached to 4 corresponds to the tap slip confirmation limit switch 28.

Furthermore, when the gearing head 12 is rotated and indexed, the forward/backward shaft 22 is disengaged from a cam (not shown) and moved backward by a spring force, and the intermediate gear 20 is engaged with the gear shaft 36 by the shift lever 21, and the intermediate gear 20 is engaged with the gear shaft 36. On the other hand, rotation in the tapping direction is transmitted. As a result, the spindle 14 is rotated and moved forward by the lead of the master screw 18. As the spindle 14 moves forward, the tap slip confirmation plate 24 is pushed by the tip of the spindle 14 and moves forward together with the mounting member 37. on the other hand,
The tap 17 bites into the hole to be tapped to perform the tapping process. At this point, if the tap 17 does not bite well or is broken, the forward movement of the tap 17 stops and only rotation occurs. This prevents the sleeve 31 from continuing forward movement of the spindle 14.
This is absorbed by displacing the movable shaft 30 relatively to the target. At this time, the tap-slip confirmation plate 24 is displaced about 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 tap slip confirmation plate corresponding to this bent portion is Since the limit switch for checking tap slip is fixed to the fixed side of the machining head via a bracket at the corresponding position until machining is completed, it is not necessary to use a complicated mechanism to move the limit switch for checking tap slip in synchronization with the forward movement of the spindle, as in the past. The tap slip confirmation limit switch does not move despite the rotational indexing of the gearing head, so there is no risk of wires connected to the tap slip confirmation limit switch being disconnected.

[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 the main part 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 an explanatory diagram of the conventional device. It is. 14...Spindle, 16...Tap holder,
18... Master screw, 24... Plate for tap slip confirmation, 25... Shaft, 27... Bracket, 28... Limit switch for tap slip confirmation, 37... Mounting member.

Claims (1)

[Claims] 1. A gearing head is provided in the machining head so as to be rotatably indexable, a drill spindle is rotatably supported on the gearing head, and a tap spindle is supported by a master screw so as to be movable in the axial direction while being rotated. A tap holder is provided at the tip of the tap holder to be engaged with the tap spindle in the rotational direction and to be relatively displaceable in the axial direction when the tap is slipped.A mounting member is supported on the tap spindle so as to be relatively rotatable, and the tip of the tap spindle is attached to the mounting member. A tap slip confirmation plate which is interposed between the tap spindle and the rear end of the tap holder and is displaced by relative displacement between the tap spindle and the tap holder is pivotally supported, and one end of the tap slip confirmation plate is parallel to the axis of the tap spindle. Attach a dog to this bent part, which has a surface parallel to the axis of the tap spindle with a dimension width from the tap biting start point to the completion of machining. 1. A tap slip confirmation device, characterized in that a limit switch for tap slip confirmation operated through a bracket is fixed to the machining head at a position corresponding to the dog.