JPS6035529Y2 - Automatic feeding mechanism of rotary drilling tool - Google Patents

Description

[Detailed description of the invention] The present invention is a pipe drilling machine for drilling a hole for connecting a branch pipe in a fluid conduit, for example. Regarding an automatic feeding mechanism for a rotary punching tool for automatic sequential feeding, the objective is to provide a mechanism that is simple in structure and yet can exhibit an appropriate and powerful feeding action.

First, embodiments of the present invention will be described below.

In FIG. 1, 1 is in the same layer as a rotating shaft 8 with a rotary drilling tool 7 attached to its tip, and its sharp tip can come into contact with the conical groove at its free end so that it can rotate relative to it. A feed screw shaft is shown, and a member 2 screwed onto the feed screw shaft 1 is fitted into a fixed cylinder portion 3 so as to be movable in the axial direction of the shaft 1.

The fixed cylindrical portion 3 includes a cylindrical body 3A fixed to the free end of an arm 11 extending from a holding frame 10 that inserts and holds the rotating shaft 8 through a cylindrical body 9, and a cylindrical body 3A that is fixed to the free end of an arm 11 that extends through a cylindrical body 9. It is composed of an adjustment cylinder 3B that is internally fitted and screwed together.

The feed screw shaft 1 is inserted into the adjustment cylinder 3B so as to rotate and move in the axial direction.

Between the fixed cylindrical body 3A of the fixed cylindrical part 3 and the above-mentioned member 2 which is movable with respect to the fixed cylindrical body 3, the outer periphery of the feed screw shaft 1, more specifically, the outer periphery of the extended narrow diameter part 2a of the movable member 2, is fitted. In this state, a coil spring 4 is inserted.

The extended narrow diameter portion 2a secures a sufficient amount of screw engagement with the feed screw shaft 1, and its free end is fitted into the adjustment cylinder 3B to stabilize the posture of the moving member 2 and the feed screw shaft 1. This is what we aim to do.

Reference numeral 5 denotes a set screw screwed into the fixed cylinder body 3A of the fixed cylinder part 3, and its free end is inserted into the concave p2b along the axial direction of the feed screw shaft 1 with respect to the moving member 2. It is engaged.

This engagement restricts the rotation of the movable member 2 with respect to the fixed cylinder 3A.

6 is a rotation operating tool attached to the free end of the feed screw shaft 1.

Next, we will discuss the automatic feeding action that accompanies drilling.

As shown in FIG. 1, with the holding frame 10 fixed via the joint T with respect to the fluid conduit M as an example of the object to be perforated, the operating tool 6 is rotated to advance the feed screw shaft 1, Along with this, the rotating shaft 8 is also advanced to bring the punching tool 7 into contact with the outer circumferential surface of the conduit M, and by further rotating the operating tool 6, the coil spring 4 is contracted and elasticized as shown in FIG. Accumulate feeding force.

Until the drilling tool 7 contacts the conduit M, the set screw 5 is in contact with the inner end of the concave groove 2b of the moving member 2, but after the drilling tool 7 contacts the conduit M, the rotation shaft 8. Since the forward movement of the feed screw shaft 1 is blocked, the moving member 2 moves in the direction (to the right in the drawing) where the inner end of the concave groove 2b separates from the set screw 5 as the feed screw shaft 1 rotates. As a result, force is stored in the coil spring 4.

The movement of the movable member 2 is such that the member 2 moves from the stepped portion 3 of the fixed cylinder 3A.
This is done until it comes into contact with the operating tool 6.
will be stopped from rotating.

Incidentally, by rotating the adjusting cylinder 3B with respect to the fixed cylinder 3A, the elastic feeding force to be accumulated in the coil spring 4 can be finely adjusted in a stepless manner.

Next, when the manual ratchet handle 12, which was previously engaged with the free end of the rotating shaft 8, is rotated back and forth, the rotating shaft 8 and the punching tool 7 rotate in one direction and begin cutting the conduit M. Since an elastic feeding force is constantly acting on the coil spring 4 of the punching tool 7 via the rotating shaft 8 and the feeding screw shaft 1, cutting of the conduit M proceeds without interruption.

Note that the holding frame 10 includes two members 10A that are relatively rotatable;
The IOB is divided into IOBs, and a set screw 13 is used to switch both members 10A and the IOB between a fixed state and a rotatable state.

This configuration is made of the dividing member 10 of the rotating shaft 8.
This is to deviate the holding position for A with respect to the axis of the other divided member 10B and to make holes for the conduit M at two locations, but it goes without saying that this embodiment is not limited to this embodiment. Alternatively, the holding frame 10 may be constructed as a single piece, and the rotating shaft 8 may be held at the center of the holding frame 10.

Alternatively, the fixed cylinder portion 3 may be constructed as an integral body.

Further, reference numeral 14 denotes an operation rod having a magnet 15 attached to its tip and slidably held in the holding frame 10, which controls the conduit M after drilling.
Although the magnet 15 is inserted inside to collect the chips, it may be implemented in a format that does not employ such a configuration.

In summary, the automatic feeding mechanism for a rotary punching tool according to the present invention is a mechanism for automatically feeding the punching tool 7 sequentially as the drilling progresses, and the rotary shaft 8 of the rotary punching tool 7
A member 2 screwed onto the feed screw shaft 1 which contacts or engages with the free end of the feed screw shaft 1 in a relatively rotatable state concentrically with the fixed cylindrical portion 3, The movable member 2 is held movably only in the direction, and the movable member 2 is held between the movable member 2 and the fixed cylinder portion 3 and on the outer periphery of the feed screw shaft 1 as the feed screw shaft 1 is rotated. It is characterized in that it is equipped with a coil spring 4 which is capable of accumulating elastic feeding force by contracting against elasticity by moving in the axial direction.

That is, after the feed screw shaft 1 is rotated forward to bring the drilling tool 7 into contact with the object to be drilled via the rotation shaft 8, the feed screw shaft 1 is rotated continuously (at this time, the forward movement is restricted). ) Since the movable member 2 is moved and the elastic feeding force is accumulated in the coil spring 4, the accumulated elastic biasing force is transferred to the movable member during the drilling action of the punching tool 7 based on the subsequent rotation operation of the rotary shaft 8. 2. The drilling tool 7 can be constantly acted on through the feed screw shaft 1 and the rotating shaft 8.

In other words, the drilling tool 7 can be kept in pressure contact with the object to be drilled at all times, and the progress of cutting by the drilling tool 7 can be ensured.
can be automatically fed by an amount exactly commensurate with the increase in cutting depth, following the progress of cutting.

In other words, even if the amount of rotation of the drilling tool 7 and the force applied in the feed direction are the same, if the object to be drilled has a change in stiffness due to the material, etc., the cutting depth will differ. However, according to the present invention, since the feed is automatic following the cutting progress, when the hardness of the object to be drilled is high, the feed is small, and when it is low, the feed is large, and in any case, the blade of the drilling tool 7 is It is possible to always exert an accurate and powerful feeding action without damaging the object to be drilled, and without causing rotation failure due to abnormal injection into the object to be drilled.

Although the discriminating action for such hardness changes is provided as a function rather than relying on human intervention, the structure may be quite simple as in the above-mentioned configuration.

[Brief explanation of the drawing]

The drawings show an embodiment of the automatic feed mechanism for a rotary drilling tool according to the present invention, in which FIG. 1 is a cross-sectional view in a non-force storage state, and FIG. 2 is a cross-sectional view showing a power storage operating state. 1...Feed screw shaft, 2...Moving member, 3
...Fixed cylinder part, 4 ... Coil spring, 7 ... Rotating punch, End ... Rotating shaft.

Claims (1)

[Scope of utility model registration request] It is a mechanism for automatically feeding the rotary punching tool 7 sequentially as the punching operation progresses, and the rotating shaft 8 of the rotary punching tool 7
A member 2 screwed onto the feed screw shaft 1 which contacts or engages with the free end of the feed screw shaft 1 in a relatively rotatable state is attached to the fixed cylinder portion 3 in the same layer as the shaft of the feed screw shaft 1. The movable member 2 is held movably only in the core direction, and is mounted between the movable member 2 and the fixed cylinder portion 3 and on the outer periphery of the feed screw shaft 1 as the feed screw shaft 1 is rotated. An automatic feeding mechanism for a rotary drilling tool, characterized in that it is equipped with a coil spring 4 which is capable of contracting against elasticity and accumulating an elastic feeding force by moving in the axial direction of the rotary drilling tool.