JPS6327937Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a setting device for presetting the thread length according to the pipe diameter in a thread cutting machine that cuts a tapered thread at the end of a pipe. Regarding.

(Prior art) As shown in FIG. 8, a taper thread cutting machine has a fixed plate 2 having a thread cutting chaser 1 that can move forward and backward in the radial direction, and is superimposed on this fixed plate 2. The die head 3 consisting of a rotatable rotating plate (not shown) for
This is done by cutting into the pipe 5 with the cutting edge of the chaser 1, which gradually retreats outward in the radial direction while being fed backward from the front end side of the pipe 5, which rotates in one direction as shown by.

In this case, the rotating plate of the die head 3 is
The rotational force of is transmitted through the chaser 1 and is strongly biased in the direction of arrow 4.

An arm 6 provided on one side of the rotating plate is in pressure contact with the upper part of a driven member 7 that can be raised and lowered. A roller 8, which is pivotally supported at the lower end of the driven member 7, is in pressure contact with an inclined surface 11 of a tapered piece 9 whose upper surface is downwardly downward (downwardly to the left in FIG. 7).

The position of the tapered piece 9 can be adjusted in the front-rear direction (left-right direction in FIG. 7) along a guide rail 13 fixed to the bed 12.

A setting shaft 14 whose base is pivotally attached to the taper piece 9 in a manner that prevents it from coming off is attached to the movable base 1 which is movable in the front and back direction.
5, and the setting shaft 14 is biased in the direction of arrow 18 by the elasticity of a compression spring 17 provided between a nut 16 screwed in the middle thereof and a movable base 15.

The horizontal portion of the L-shaped arm member 19, the base of which is fixed to the upper portion of the nut 16, is inserted through the opening of the engagement piece 21 erected on the upper portion of the tapered piece 9, and then
The end portion is pressed against the lower end of the driven member 7 by the elastic force of the spring 17 .

The movable table 15 has a display board 2 that displays the pipe diameter.
The base of the pipe 2 is fixed, and the thread length of the pipe is set by aligning a base line 23 engraved on the circumferential surface of the setting shaft 14 with a suitable position on the display plate 22.

Now, when thread cutting is started with the driven member 7 set at the position shown in FIG.
By moving in the direction of arrow 18, the driven member 7 also moves in the same direction, causing the rotary plate of the die head 3 to rotate in the direction of arrow 4, thereby gradually increasing the thread diameter of the pipe.

When the roller 8 of the driven member 7 comes off the taper piece 11, the chaser 1 separates from the pipe 5,
Thread cutting is completed.

Therefore, the length of the thread formed in the pipe 5 is expressed by the horizontal distance L that the roller 8 travels down the inclined surface 11.

Since the thread length of the pipe 5 varies depending on the pipe diameter, the thread length is set by moving the taper piece 9 back and forth accordingly.

In the above-mentioned conventional screw length setting device, the knob 24 at the end of the setting shaft 14 is rotated in a required direction to move the nut 16 forward and backward relative to the taper piece 9, but the pipe diameter Since there are various types of knobs ranging from relatively small to large, it takes too much time to rotate the knob 24 by the required amount each time, resulting in a disadvantage that workability is reduced.

(Purpose of the invention) The purpose of the invention is to connect the front end of a setting shaft whose base is fixed to a tapered piece and is biased backward to the circumferential surface of a setting cam having a plurality of different circumferential distances.
It is an object of the present invention to provide a thread length setting device for a taper thread cutter, which allows the thread length of a pipe to be easily set by selectively applying pressure and adjusting the position of a taper piece.

(Example) The present invention will be described below based on an example shown in FIGS. 1 to 6.

In FIG. 3, a chuck 28 that moves forward and backward in the radial direction by the rotation of a nut 27 is provided at the front part of a drive part 26 provided in the middle of the bed 25, and is held by this chuck 28. Pipe 29 is rotating in the direction of arrow 31.

A movable table 33 is supported by a pair of guide rods 32 fixed in parallel on both sides of the bed 25 so as to be movable back and forth. This movable base 33 is moved by rotating a handle 34 provided on the left side of the movable base 33.

The die head 35, which has the same axis as the pipe 29, is
It consists of a fixed plate 36 that does not rotate around an axis, and a setting plate 37 and a rotating plate 38 that are overlapped with the fixed plate 36 and are rotatable relative to the fixed plate 36.

The fixed plate 36 is provided with a plurality of thread cutting chasers (not shown) whose cutting edges face toward the center and can move forward and backward in the radial direction. By rotating the setting plate 37 to a desired position, the inner end of the chaser is set at a predetermined radial position depending on the pipe diameter. When the rotating plate 38 is rotated in the direction of the arrow 31 as will be described later, it causes the chaser to move outward from the initial setting position.

The arm 35a protruding from the right side of the fixed plate 36 is
The die head 35 is pivotally connected to a support shaft 39 fixed to the movable table 33, and the die head 35 can be rotated to an upper non-working position about the support shaft 39.

As shown in FIG. 1, on the left side of the movable base 33,
A protrusion 42 having a groove 41 opening upward is formed, and a locking member 44 biased toward the groove 41 by the elasticity of a tension spring 43 is provided at the front of the protrusion 42. is inserted.

By engaging and disengaging the locking member 44 in a recess 46 that opens forward (rightward in FIG. 1) in an arm 45 that protrudes from the left side of the fixing plate 36,
The arm 45 of the die head 35 is attached to and detached from the movable table 33.

The large diameter portion 48 of the driven member 47, which is fitted into the movable base 33 so as to be able to rise and fall, connects the end of the guide screw 49 that is screwed to the movable base 33 with an axial direction drilled in the large diameter portion 48. Rotation is prevented by engaging the groove 48a.

The lid 5 through which the small diameter portion 51 of the driven member 47 is inserted
2 is a compression spring 53 fixed to the back surface of the movable base 33 and provided between the lid 52 and the large diameter portion 48.
The driven member 47 is urged upward by the elasticity.

The upper end of the driven member 47 is pressed by the lower surface of an arm 54 projecting from the left side of the rotating plate 38.

A tapered piece 55 located below the driven member 47 is provided with an inclined surface 55a extending downward from the rear (downward to the left in FIG. 1).
, a roller 5 is mounted on the lower end of the driven member 47.
6 is in pressure contact so that it can move back and forth.

A guide rail 57 on which the tapered piece 55 is placed and facing in the front-rear direction is attached to the bed 25 with screws 58.

As shown in FIG. 2, the upper part of an engagement member 59 having an inwardly directed engagement piece 59a on the lower side is fixed to both sides of the tapered piece 55 by a plurality of pins 61. The engagement piece 59a of the engagement member 59 is inserted into the groove 5 bored in the front and back direction on both sides of the guide rail 57.
By loosely fitting the tapered piece 55 into 7a,
It can move back and forth along the guide rail 57.

The bottom surface of the tapered piece 55 and the top surface of the guide rail 57 are provided with anti-slip finely uneven surfaces 55b and 57b, respectively, which are formed by, for example, providing fine lines in the lateral direction.

A base portion of the setting shaft 62 is inserted into the front end surface of the taper piece 55, and is fixed by a set screw 63 screwed into one side of the taper piece 55.

A vertical portion 64a of a support member 64 having an L-shape in side view is fixed to the front end of the movable base 33 with a bolt 65, and a setting shaft 62 is loosely fitted into the vertical portion 64a.

The taper piece 55 and the setting shaft 62 are connected to the taper piece 5
5 and the support member 64, the elasticity of the compression spring 66 provided around the operating shaft 62
direction).

On the horizontal part 64 of the support member 64, there is an operation part 67.
is fixed.

In FIGS. 4 and 5, an upper cover 71 is fixed by screws 72 to the upper part of a column 69 which is disposed at each corner of the operation section 67 and has its base fixed to a lower cover 68.

As shown in FIG. 4, a wall plate 73 is fixed to the rear part of both covers 68, 71, and an L-shaped wall plate 70 is fixed to the right side and front part, respectively.

The base of a boss 75 is fixed to the upper cover 71 so as to pass through the base. An operating shaft 75 passes through a position eccentric from the axis of the boss 74, and a handle 76 and a setting cam 77 are fixed to the upper and lower parts of the operating shaft 75 by pins 78 and 79, respectively.

The setting cam 77 includes a plurality of side surfaces 77a having different radial distances from the operating shaft 75.

These radial distances increase in accordance with the length of the thread cut on the pipe 29, and on the top surface of the handle 76, the dimension diameter 76a of the pipe corresponding to each side is displayed.

By matching these dimensions and diameters with the arrow 79a of the indicator plate 79 fixed to the upper cover 71, the thread cutting length is set according to the pipe diameter.

In FIG. 6, a compression spring 81 and a ball 82 are embedded in a hole 74a formed in the boss 74 of the upper cover 71.

A ball 76b presses into one of holes 76b drilled in the back surface of the handle 76 corresponding to each diameter 76a, thereby positioning the setting cam 77.

When setting the thread length for the pipe 29, the locking member 44 shown in FIG. 1 is unlocked, the die head 35 is rotated upward around the shaft 39, and
The pressing load on the elevating member 47 is removed.

In this state, by turning the handle 76, the setting cam 77 is set at a position corresponding to the pipe diameter. With this setting, the driven rod 78 moves back and forth as shown by the arrow in FIG.

As the taper piece 55 moves back and forth, the roller 56 of the driven member 47 moves relatively on the inclined surface 55a, and the thread cutting length between the roller 56 and the rear end surface 55c of the taper piece 55 is set.

With the die head set in the working position shown in FIG. 3, operate the handle 34 and rotate the pipe 29 in the direction of the arrow 31 with the die head's chaser in contact with the front end of the pipe 29.
Thread cutting for pipe 29 begins.

The die head 35 is attached by a thread cut into the pipe.
is automatically sent rearward, and the roller 56 of the driven member 47 descends on the inclined surface 55a of the tapered piece 55.

While cutting the thread, the driven member 47 descends, and the rotating plate 38 moves in the direction of the arrow 31 with respect to the fixed plate 36.
By gradually rotating in the direction, the chaser gradually moves outward, so that the pipe 29 has a
A tapered thread is formed.

When the roller 56 of the driven member 47 comes off the slope 55a and falls onto the end face 55b of the tapered piece 55, the chaser comes off the pipe 29 and the thread cutting operation is completed.

When the roller 56 of the driven member 55 falls from the inclined surface 55a, a large force acts on the tapered piece 55 to push it forward.

Immediately before the end of thread cutting, the taper piece 55
If it escapes forward, there is a problem that the chaser will come off the threaded part just before the thread cutting is finished, causing damage to the threaded part.

In the above embodiment, the lower surface of the taper piece 55 and the upper surface of the guide rail 57 are provided with anti-slip unevenness 55b, 57a, so that the taper piece 55 is prevented from escaping just before the end of thread cutting, and the taper piece 55 is completely cut. Can perform full thread cutting.

(Effects of the invention) As described above, according to the invention, the threading length of the pipe is set by adjusting the position of the taper piece for rotating the rotary plate of the die head in the front and back direction. In a thread cutting machine, by fixing the base to the taper piece and pressing the setting shaft extending forward against the circumferential surface of a setting cam having a circumferential surface with a radial distance corresponding to the thread cutting length,
When changing the thread cutting length according to the pipe diameter, simply by rotating the setting cam to the position corresponding to the pipe diameter, you can set the taper piece to the desired position and thereby set the thread cutting length. This can be easily done within a short time, and it is possible to improve the work efficiency of thread cutting of pipes with different diameters.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a thread length setting device in a taper thread cutting machine showing an embodiment of the present invention;
The figures are a sectional view taken along the line A-A in Fig. 1, Fig. 3 is a plan view showing an example of a taper thread cutting machine to which the present invention is applied, Fig. 4 is a plan view of the operating section, and Fig. 5 is a plan view showing an example of a taper thread cutting machine to which the present invention is applied. , FIG. 6 is a sectional view taken along line C-C in FIG. 4, FIG. 7 is a side view showing an example of a conventional screw length setting device, and FIG. 8 is a sectional view taken along line C-C in FIG. FIG. 2 is a front view of the die head and the driven member portion. 1...Cheeser, 2...Fixing plate, 3...Die head, 4...Arrow, 5...Pipe, 6...Arm, 7
... Driven member, 8 ... Roller, 9 ... Taper piece,
11... Inclined surface, 12... Bed, 13... Guide rail, 14... Setting axis, 15... Movable base, 1
6...Natsuto, 17...Spring, 18...Arrow, 1
9... Arm member, 21... Engaging piece, 22... Display plate, 23... Base line, 24... Knob, 25... Bed, 26... Drive section, 27... Nut, 28...
...Chick, 29...Pipe, 31...Arrow, 3
2... Guide shaft, 33... Movable base, 34... Handle, 35... Die head, 36... Fixed plate, 3
7... Setting plate, 38... Rotating plate, 39... Support shaft,
41...Groove, 42...Protrusion, 43...Spring, 44
... Locking member, 45 ... Arm, 46 ... Recess, 47
...Followed member, 48...Large diameter portion, 49...Guide screw, 51...Small diameter portion, 52...Lid, 53...Compression spring, 54...Arm, 55...Taper piece, 56...
...roller, 57...guide rail, 58...screw, 59...engaging member, 60...arrow, 61...
Pin, 62... Setting axis, 63... Set screw, 64
... Support member, 65 ... Bolt, 66 ... Compression spring, 67 ... Operation section, 68 ... Lower cover, 69
...Strut, 71...Top cover, 72...Screw,
73, 74... Wall plate, 75... Boss, 76... Handle, 77... Setting cam, 78, 79... Pin, 81... Compression spring, 82... Ball.

Claims (1)

[Claims for Utility Model Registration] (1) The inner end of the chaser, which is provided on the fixed plate of the die head that is supported by a movable base that can move forward and backward toward the front end of the pipe that rotates in one direction, and which can move forward and backward in the radial direction. The cutting edge of the die head, which rotates in accordance with the feed of the movable base, is attached to the inclined surface of the tapered piece whose upper surface is downward downward and whose position can be adjusted in the front and rear directions along the guide rail, through a driven member that can be raised and lowered. In a taper thread cutting machine that cuts a tapered thread into a pipe by cutting into the peripheral surface of the pipe while retracting it from the center by rotating the rotating plate, the base is fixed to the taper piece and the thread is moved forward. A screw length setting device for a taper thread cutting machine, characterized in that an end of an extending setting shaft is pressed into contact with a setting cam having a plurality of different circumferential distances, which is fixed to the movable base. (2) Utility model registration claim No. (1) characterized in that the bottom surface of the tapered piece and the support surface of the guide rail on which the surface slides are provided with fine irregularities for anti-slip purposes. Thread length setting device for the taper thread cutting machine described in 2.