JPS58211822A - Thread cutting attachment of machine tool - Google Patents

Abstract

PURPOSE:To prevent vibration caused by a shock, in which a stopper piece hits a positioing limit part at resetting time of a turning cam, by resetting a movable holder through pull down motion of a handle and the turning cam automatically to a cutting start position. CONSTITUTION:A cam part (a), pressure receiving cam part (b) and recessed parts of a brake cam part (c), cut up positioning part (d), escape turn promoting part (e), escape turn deceleration part (f), etc. are formed to a turning cam 9. And successively to the above parts, a turning cam resetting sloped cam part (g) and an escape resetting part (h), which can automatically turn an auxiliary resetting upper subpawl 16 in parallel to the cam part (g), are provided, while a resetting sloped cam part (i) only use for the subpawl 16 is parallel to the recessed parts (e), (f) is formed in a staircase shape from the resetting part (h) partially successively to the cam part (g). In this way, interlocking to the resetting of a movable holder 2 by a resetting depressive handle 6 fixed to the holder 2, the turning cam is automatically reset to a cutting start position and thread cutting work can be repeatedly performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an attachment for accurately and smoothly inserting and removing a cutting tool into and out of a workpiece during thread cutting using a lathe. This invention relates to an improved type of rotary cutting edge attachment for machine tools.

First, the problems with conventional inventions are as follows: First, the impact of the rotary cam hitting the stopper during return often causes small rotational vibrations, and the pressing rod of the drive holder securely enters the pressure receiving part of the rotary cam. The second problem is that the movable holder can be returned by rotating the brake lever together with the return lever by pressing down on the push-down handle that is pivoted to the movable holder, disengaging the brake piece from the rotation cam, and rotating the movable holder. Because of the mechanism that returns the rotating cam and movable holder using a cam return spring, a push-up spring and a tilting piece are attached to the push-down handle, and the number of parts such as the return lever is large, making manufacturing and adjustment difficult. There were drawbacks such as. Thirdly, as mentioned above, the push-down handle is used to push down the movable holder and at the same time push the brake lever open, which requires a lot of effort, causing physical overwork to the worker during continuous work. There was a drawback.

Therefore, in this invention, the push-down handle for return is fixed to the movable holder, and the movable holder is returned by simply pulling down the handle, and the rotary cam is automatically operated to return to the cutting start position accordingly. Therefore, it is possible to reliably prevent the rotational vibration that often occurs due to the impact that hits the return positioning stopper when the rotation cam returns, and furthermore, the return lever,
The push-up spring attached to the push-down handle, the tilting piece, the return spring of the rotating cam, etc. were removed, and the shape of the rotating cam was improved instead, and the composite action of the main pawl and sub-type attached to the brake rod. By simplifying the mechanism that enables automatic return of the rotary cam, the number of parts is reduced and the manufacturing process is simplified.As a result, adjustment of each part is easy, and the reliability of operation is increased, resulting in stability during cutting. The present invention provides a thread cutting attachment in which the labor required for return work is reduced and physical fatigue is significantly alleviated.

An embodiment of the present invention will be described below with reference to the drawings. A cutting tool (1) is attached to a movable holder (2), and the movable holder (
2) is rotatably attached to the support body (4) around the support shaft (3) at one end, and is pivoted with a close contact spring (5) interposed therebetween, and the movable holder (2) at the other end. There is a push-down handle for return (6
) is fixed to the support body (4), and a rotary cam (9) having a rotary lever (7) and an operating rod (8) and a stop ring θ1 for limiting the return position of the cam are attached to the support shaft (l). ), and the press rod (2) of the movable holder (2), which can be pressed against the outer periphery of the rotary cam (9), and the support shaft (4) are fixed by the support shaft θ field. Brake rod that stops and rotates 0
and insert a pulling spring α◆ between this and the movable holder (2), and the operating rod (8) contacts the stopper (S) of the lathe to rotationally drive the rotating cam (9). In the thread cutting attachment that can cut straight or tapered threads, the brake rod (6) has a main pawl (T) at the tip of the brake rod (6) that also serves for braking the rotary cam (9), positioning the rotary cam (9), and returning the rotary cam (9). is fixed, and a bearing 0η is provided on the axis αη of the sub mold (IQ) and the main jaw QJ at an eccentric position from the center line of the tip of the main jaw (c), and the axis a”tr is rotatably overlapped with the main jaw α. Attach the sub-type tension spring Qe to the arm of this shaft aη, and the sub-type l7if!r1 stopper asu to the brake rod (2), and also install the cheater screw tracing cam part (
a), the pressure receiving cam part (b) and the braking cam part (Q) for the main pawl Qe, as well as the raised positioning part (2), the escape rotation promotion part (e), the escape rotation reduction part (f), etc. forming a section;
Continuing with this, there is an inclined cam part (g) for returning the rotary cam, and a relief part (h) that allows free rotation of the sub-type aQ for auxiliary return, which is parallel to this, and the concave part (@ ) l (f
) is formed by forming a returning inclined cam part (1) exclusively for the sub-type a1S in parallel with the returning inclined cam part (g) in a step-like manner.

In the drawings, (1) is a tool post attachment part, (2) is a cutting tool escape amount adjusting device that adjusts the degree of rotation of the movable holder (2), and the direction of the arrow is the direction of rotation or movement of each member.

The embodiment of the attachment according to the present invention is constructed as described above, and is used by attaching the attachment part (4) to the tool post (not shown) on the carriage of the lathe with bolts. It is. When cutting a straight thread, first place the stopper (S) at the top position of the thread on the lathe bed, and when cutting a tapered thread, set the stopper (S) at the beginning of cutting. The operating rod (8) of the rotary lever (7) is set and used so that it comes into contact with and stops at the cut-up position or cutting start position of the screw, and the rotary cam (9) can be rotated. It is.

Next, to explain the straight thread cutting shown in Fig. 4 (A) as an example of use, the attachment is attached to the tool rest that feeds the screw in the direction of the arrow parallel to the workpiece (W), and the attachment is attached to the movable holder (2) of the attachment. The cutting depth of the cutting tool (1) is made using the handle of the lathe used, and the cutting tool (1) starts thread cutting.

The cutting tool (1) continues thread cutting until it reaches the cut-up position, and the stopper (S) installed in advance at the cut-up position
When the operating rod (8) of the attachment comes into contact and stops advancing, the center of the stopped operating rod (8) and the center of the rotating cam (9) of the attachment that continues cutting are continuously connected. Since the angle will change, the rotating cam (
9) begins to rotate in the direction shown by the arrow, and as shown in the figure, the fourth
As the attachment progresses from the state shown in figure (a), the fourth
The guard rotating cam (9) is rotating so as to reach the state shown in Figure (b). When the main claw is α, the cut-up positioning portion (
d), the cut-up positioning portion (
, L) is pushed up by the protruding part of the movable holder (2), and at the same time the locking is released and released, the pressing rod of the movable holder (2) @
is the receiving pressure input part (
b) Separate from the free part (rotate back to the ladle and cut up the thread).
The process ends as shown in figure (b). In addition, Fig. 4) is a side view of the movable holder (2) that has rotated in the direction of the arrow about the support shaft (3) of the movable holder (2) and the integrated cutting tool (1) that has been fully raised. This is an abbreviation.

The rotation of the rotation cam (9) due to inertia in the direction of the arrow due to the retreat of the pressing rod (2) causes the main pawl (G) to hit the relief rotation reduction part (f) as shown in Fig. 6. This is slowing down.

Next, to explain taper thread cutting, when cutting a tapered thread, first, in order to determine the cutting length dimension, the stop portion θ6 of the stop ring θ0 and the locking piece (7) of the rotating lever (7) are engaged with each other. The position is set by screwing the stop 3JIQO to the support shaft αυ, and the pulling spring Q41 is moved until the locking piece (7) of the rotary lever (7) hits the set stop QO of the stop ring OQ. The main pawl 00 of the braking rod α field due to the tensile force becomes a pressing force against the rotating cam (9), and the pressing force rotates the rotating cam (9), and the above-mentioned pulling spring (D
The tensile force i also presses the pressing rod (6) against the tapered threaded cam portion (a).

At this time, during cutting, the pressing rod (2) is rotated by the rotating cam (
9) The tapered thread tracing cam part (-), since the action of pushing it in the same direction as the rotation direction for taper cutting changes to a rotational action, the rotational cam by the stopper (S) is used for this rotational action. (9) In addition to the rotation, it has the property of generating acceleration force, resulting in an extremely irregular rotation state, so the brake cam part (0) is attached to the main part of the brake lever (to) to the extent that this acceleration force is removed. Claw α
This irregular rotation is completely prevented by pressing and controlling Q with a pulling spring Q4, and thread cutting is performed so that the pressing rod @ slides faithfully against the tapered thread tracing cam part (&). It is something. And the operating rod (8) is a stopper (
S) from the beginning of cutting and stops moving, and as the thread cutting attachment progresses, the rotating cam (9)
rotates in the direction of the arrow, so the tapered thread tracing cam part (
The pressing rod α frame that presses against the cam follows the arc surface of the cam, so the cutting tool (1) accurately cuts a tapered thread into the workpiece (b), and the cutting of the tapered thread is the same as for the straight thread described above. Operation ends thread cutting.

The operations of the rotary cam (9), the pressing rod (8), the main pawl Q0, and the sub-die ae after thread cutting is completed are also the same as those of the straight thread cutting described above.

Thus, it is conventional to return the attachment to the starting position after each thread cutting and repeat thread cutting. In this case, in order to advance the cutting tool (1) that has been retreated from the workpiece (b) to the cutting position after thread cutting, the movable holder (2) is returned to its original position by pushing down the handle (6) of the movable holder (2). At the same time, the rotating cam (9) is activated by pressing the inclined cam part (g) for returning the rotating cam of the main pawl 0 and the sub-claw OQ and the cam part (1) for returning the secondary pawl only by the pulling spring a4. This automatically restores the pie (1) and returns it to the cutting position.

Note that cutting into the cutting tool is done using the turret feed handle of the lathe used.

As mentioned above, when the sub-type θ is used, when rotating the rotary cam (9) for thread cutting, the rotary cam (9) operates rotatably only in that direction as shown in Figure 6 (→), and the rotary cam (9) It is a mechanism that does not impede the rotational movement of the rotational cam (9), and also causes the return movement of the rotational cam (9).
The concave portions such as the escape rotation reduction portion (f) allow the sub-type 0Q to slide on the sub-type return inclined cam portion (1) provided in parallel with the concave portion, as shown in FIG. 6(c). As shown in , the main pawl DI can also pass together with the sub mold aQ and return to the cut-up positioning part (d) without falling into the recessed part.

As explained above, the present invention provides a contact spring (5) on the support shaft (3) in order to bring the moving surfaces of the support body (4) and the movable holder (2) into close contact with each other, and also includes a pulling spring α→ The tension force causes the pressing rod (2) and the main pawl αQ to be opposed to each other and pressed against the rotating cam (9).

Due to the above action, the support (4) and the movable holder (2) to which the cutting tool (1) is attached are in a fixed state, and the support (4) and the movable holder (2) caused by the cutting movement to cut the thread It is possible to completely prevent the loosening action of the cutting tool and the deflection of the cutting tool caused by the attachment, making it possible to prevent repeated cutting of pies.
(1) Thread cutting is always carried out reliably at a predetermined cutting-up position due to the regulating action of the main pawl αQ and the cutting-up positioning portion (d), and the cutting can be done quickly and in a timely manner. Furthermore, since the cutting tool maintains stability during cutting, it has the remarkable effect of eliminating any damage to the cutting edge, and has the great advantage of being able to maintain the state of the cutting tool's cutting edge for a long time.

In addition, by changing the position of the stopper θQ that limits the rotation angle of the rotating cam (9), it has a mechanism that allows you to easily switch from straight thread cutting to tapered thread cutting, which requires a separate taper attachment as in the past. We are working to improve the sophistication and rationalization of our equipment.

As explained above, the present invention has versatility, and in cutting, it is possible to perform powerful cutting at a high cutting speed using a carbide cutting tool, and it is also possible to perform precise thread cutting.
Not only has machining accuracy and efficiency been significantly improved, but threads can be cut more reliably, and the automatic return of the rotary cam with this modification has the great effect of eliminating mental and physical fatigue.

In addition, the mechanism is simple and trouble-free, and it can be operated by simply pushing down on the handle, so no skill is required. be.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 partially shows a side view of the notch, FIG. 2 partially shows a top view of the notch, and FIG. 3 partially shows a bottom view of the notch, and FIG. Figures 4 (B) and (C) are explanatory diagrams schematically showing the movement mechanism in different usage examples, respectively.
Figure 5 (1') is a plan view of the main parts of the rotating cam and the brake lever, etc.
Figure 5 (B) is a front view with a partial cutout showing the braking rod and sub mold attached state, Figure 5 (C) is a perspective view with a partial cutout of the main part of the rotating cam, and Figure 6 (I). ), (b), and (c) are partially cutaway plan views showing the operational relationship between the main parts of the rotary cam, the main pawl, and the sub-die. Lee cutting tool 2. Movable holder 3. Support shaft 4. Support body 4. Turret mounting part 5. Close contact spring 6. Push down handle for return 7. Rotating lever 7. Locking piece 8
・・Operating rod 9・・Rotating cam 10・・Stopping ring 10・
- Stopping part 11... Support shaft 12... Pressing part 13... Brake rod 13... Support shaft 14... Draw spring 15... Main pawl 16... Sub-mold 17... M 17... Bearing 18
...Sub-type tension spring 19...Sub-type 815 stopper 2
0...Bite escape amount 13 section device M..., V workpiece s...
Stopper a--Tapered thread tracing cam part b--Pressure cam part b--Releasing part C--Brake cam part d--Cut-up positioning part e--Escape rotation promotion part f--Escape rotation reduction part g-・Inclination cam part for return h...Sub mold escape part 1...Inclination cam part for return exclusively for sub-claws Figure 1 Figure 3 Figure 6 (c) Procedural amendment (voluntary) 17J 1 display 1988 special Patent Application No. 95074 2 Name of the invention
Attachment for machine tool thread cutting 3 Relationship with the case of the person making the amendment Patent applicant 4° “8” Ent.1 change number ぢ473゜6, Detailed description of the invention increased by the amendment Particulars (correction) Name of the invention Attachment 2 for machine thread cutting, Claims A cutting tool (1) is attached to a movable holder (2), and the movable holder (2) has a supporting body (4) centered around a support shaft (3) at one end.
) is rotatably supported by a contact spring (5), and a push-down handle (6) for return is attached to the movable holder (2) at the other end, and the support body (4 ) has a rotating lever (7
) and a locking piece (7), a rotary cam (9) having an operating rod (8), and a stop ring 0Q forming a stop portion a1 for limiting the return position of the cam are fixed by the support shaft θυ, and further rotated. A press rod (6) of the movable holder (2) that can be pressed against the outer circumference of the movable cam (9) and a brake that is rotatably supported by a support shaft (to) on the support body (4). Install the rod,
A pulling spring A4 is inserted between this and the movable holder (2), and the operating rod (8) contacts the stopper (El) of the lathe to rotationally drive the rotary cam (9) to rotate the strut screw. , or a thread cutting attachment that enables tapered thread cutting, the brake rod (2) has a rotary cam (9
) is fixed, and is rotated eccentrically from the center line of the tip of the main pawl tta by receiving a bearing d on the axis ση of the sub-type aQ and the main pawl OQ. It is attached to the main claw αG so that it can move freely, and the sub-type tension spring is attached to the arm of this axis αη, and the sub-type adjustment stopper 01 is attached to the braking rod α arm, and the rotating cam (9 ) has a tapered thread tracing cam part (IL) and a pressure receiving cam part (b).
In addition to the braking cam part (c) for the main pawl Qf9, the cut-up positioning part (Q. Escaping rotation promotion! is <e>, the escape rotation reduction part (f)
Continuing with this, there is a tilted cam part (g) for return of the rotary cam + an escape return part (g) that allows free rotation of the upper sub-type QQ for auxiliary return parallel to this. ) Continuously with the recessed portions (e) and (f), the sub-type αQ-dedicated returning inclined cam part (1) is partially continuous with the returning inclined cam part (1c), and the sub-type escape part is connected. Return part (formed in a step-like shape from the beginning,
In conjunction with the return of the movable holder (2) by the return push-down handle (6) fixed to the movable holder (2), the rotary cam automatically returns accurately to the cutting start position and thread cutting is repeatedly performed. A thread cutting attachment for machine tools featuring: 3. Detailed Description of the Invention The present invention is an attachment for accurately and smoothly inserting and removing a cutting tool into and out of a workpiece during thread cutting using a lathe. This invention relates to an improved type of rotary cutting edge attachment for machines. First, the problems with conventional inventions are as follows. First, when the rotating cam returns, the impact of the locking piece of the rotating cam hitting the stop portion often causes small rotational vibrations, causing the pressing rod of the movable holder to rotate. There is a drawback that it is difficult to reliably enter the pressure receiving part of the movable cam.Secondly, the movable holder must be returned by pressing down on the push-down handle that is pivoted to the movable holder, and at the same time, the brake lever must be pressed together with the return lever. For the mechanism in which the rotation cam is rotated, the stopping piece is separated from the rotation cam, and the rotation cam is returned by the rotation cam return spring, a push-up spring, a tilting piece, etc. are attached to the push-down handle. There were drawbacks such as a large number of parts such as levers, making it difficult to manufacture and adjust. Thirdly, as mentioned above, the push-down handle pushes down the movable holder and at the same time pushes the brake lever open, which requires a lot of effort, causing physical overwork to the worker during continuous work. There was a drawback. Therefore, in this invention, the push-down handle for return is fixed to the movable holder, and the movable holder is returned by simply pulling down the handle, and the rotary cam is automatically operated to return to the cutting start position accordingly. Therefore, it is possible to reliably prevent the rotational vibration that often occurs due to the impact of the locking piece hitting the return positioning stop part when the rotating cam returns.In addition, the return lever, the push-up spring attached to the push-down handle, and the tilting piece In addition, the return spring of the rotary cam was removed, and the shape of the rotary cam was modified instead, and the automatic return of the rotary cam was made possible through the combined action of the raw claw and sub-type attached to the brake rod. Simplification reduces the number of parts and makes the manufacturing process easier.
Therefore, the present invention provides a thread cutting attachment that allows adjustment of each part to be simple, increases reliability of action, provides stability during cutting, reduces return work effort, and significantly alleviates physical fatigue. be. An embodiment of the present invention will be described below with reference to the drawings. A cutting tool (1) is attached to a movable holder (2), and the movable holder (
2) is rotatably supported by a support body (4) around a support shaft (3) at one end with a close contact spring (5) interposed therebetween, and a movable holder (2) at the other end. There is a push-down handle for return (6
) is fixed, and the support (4) has a rotating cam (7) and a locking piece (7) 9 with an operating rod (8).
9) and the movable holder (2), in which a stop 10 forming a stop portion aO for limiting the return position of the cam is pivotally supported by a support shaft αη, and the movable holder (2) is capable of being pressed against the outer circumference of the rotary cam (9). ) and the support shaft a3 to the support body (4).
Attach a brake lever (to) that is pivoted and rotated by the lever, and insert a pulling spring A4 between this and the movable holder (2), so that the operating lever (8) comes into contact with the stopper (S) of the lathe. In a thread cutting attachment that enables cutting of straight threads or tapered threads by rotationally driving a rotating cam (9),
As shown in FIG. 5, a main pawl α frame is fixed to the tip of the brake rod (end), which also serves for braking the rotary cam (9), positioning the rotary cam (9), and returning the main pawl αe. A bearing Q7) is provided on the axis Q''I) of the sub-die Q6 and the main claw θe at an eccentric position from the center line of the tip, and the sub-die OQ is mounted on the axis Q7) so as to be rotatably overlapped with the main claw QO. A sub-type tension spring (1119) is installed between the arm 0119 of "t) and the rear end of the brake rod Q3, and a sub-type adjustment stopper 00 is installed on the brake rod 03, and a taper screw is installed on the rotary cam (9). Tracing cam section (
a), the pressure receiving cam part (b) and the braking cam part (c) for the main pawl ←Q, as well as the cut-up positioning part (d), escape rotation promotion part (θ), escape rotation reduction part (f), etc. forming a concave portion;
Continuing with this, there is an inclined cam part (g) for returning the rotary cam, and an escape return part (h) that allows free rotation of the sub-type 0 for auxiliary return, which is parallel to this, and the concave part. (θL(f) The sub-mold escape return part (h
) is formed into a step-like shape. In the drawing, (4) is the turret mounting part, and (a) is the cutting tool escape amount that adjusts the rotation angle of the movable holder (2). This is a JR knot device, and the direction of the arrow is the direction of rotation or movement of each member. The embodiment of the attachment according to the present invention is constructed as described above, and the above-mentioned mounting portion (4) is used to attach the attachment to a tool rest (not shown) on a carriage of a lathe. When cutting a straight thread, first place the stopper (S) at the top position of the thread on the lathe bed, and when cutting a tapered thread, set the stopper (S) at the beginning of cutting. The operating rod (8) of the rotary lever (7) is set and used so that it comes into contact with and stops at the cut-up position or cutting start position of the screw, and the rotary cam (9) can be rotated. It is. Next, an example of its use is shown in Figure 4 (a) for straight thread cutting.
To explain this, an attachment is attached to a tool rest that is threaded in the direction of the arrow in parallel to the workpiece (M), and a cutting tool (1) attached to a movable holder (2) of the attachment is attached.
) The cutting depth is done using the handle of the lathe used.
The cutting tool (1) starts thread cutting. Ba? h(x) continues thread cutting until it reaches the rounded-up position, and the stopper (8) installed in advance at the rounded-up position
When the operating rod (8) of the attachment comes into contact and stops advancing, the center of the stopped operating rod (8) and the center of the rotating cam (9) of the attachment that continues cutting are continuously connected. Since the angle will change, the rotating cam (
9) begins to rotate in the direction shown by the arrow, and as shown in the figure, the fourth
As the attachment progresses from the state shown in figure (a), the fourth
The rotating cam (9) is rotating so as to reach the state shown in FIG. The main claw αQ is pressed against the cut-up positioning part (d) by the pulling spring a4 as the rotating cam (9) rotates
), the round-up positioning part (
At the same time, the movable holder (2) is pushed up by the projection of
Due to the backward pulling force of the pulling spring 04, the buri detaches from the pressure-receiving cam part (b) and rotates back to the free part () to cut the thread into the workpiece (2) as shown in Fig. 4 ( The process ends as in the state shown in (b). Also, in Fig. 4), the cutting tool (1) integrated with the movable holder (2) rotates in the direction of the arrow with the support shaft (3) of the movable holder (2) as the fulcrum. )
FIG. 10 schematically shows a side view of the state in which the rounding up has been completed. By the way, as the pressing rod (2) moves back, the rotating cam (9) rotates due to inertia in the direction of the arrow, and is decelerated by applying the main pawl θυ to the escape rotation reduction part (f) as shown in Fig. 6. are doing. Next, to explain taper thread cutting shown in FIG.
The locking position with the locking piece (7) of the locking ring OI is moved to the support shaft θη.
is set depending on the position where the screws are to be screwed, and the braking rod (
2) main pawl (16 and sub-type (II) are the return inclined cam parts (g) and (i) of the rotating cam (9) and the braking cam part (0
), and the pressing force causes the rotating cam (
9), and the tensile force of the pulling spring α→ also presses the pressing rod (2) against the tapered threaded cam portion (a). At this time, during cutting, the pressing rod (2) performs taper cutting against the tapered thread tracing cam portion (a) of the rotary cam (9) due to the combined action of the cutting resistance, resistance, and the tensile force of the pulling spring α◆. The action of pushing and turning in the same direction as the rotation direction changes to the rotation operation, so the above-mentioned stopper (S)
The property of generating acceleration force in addition to the rotation of the rotating cam (9) by
, and it becomes an extremely irregular motion state,
The main pawl a0 of the brake rod α frame is pressed against the brake cam part (Q) by the pulling spring α→ to the extent that this acceleration force is removed, and this irregular rotation is completely prevented, and the pressing rod Thread cutting is performed so that the thread slides faithfully against the tapered thread tracing cam part (&). and operating rod (8)
comes into contact with the stopper (S) from the beginning of cutting and stops its progress, and as the thread cutting attachment progresses, the rotary cam (9) rotates in the direction of the arrow, so the tapered thread tracing cam part (&) The pressing rod @ that presses against the cam follows the arc surface of the cam, so the cutting tool (1) accurately cuts a tapered thread into the workpiece (M), and the tapered thread is cut in the same way as the straight thread described above. end. The operations of the rotary cam (9), the pressing rod (8), and the main pawl 0e after the thread cutting is completed are also the same as those for the straight thread cutting described above. Thus, it is conventional to return the attachment to the starting position after each thread cutting and repeat thread cutting. In this case, after thread cutting, the processed material -(M)-
To advance the cutting tool (1) to the cutting position, the movable holder (2) is returned by pushing down the handle (6) of the movable holder (2), and the The pawl aυ and the sub-type aQ include the rotating cam return inclined cam part (g) and the sub-type dedicated return inclined cam part (1) (in the case of taper thread cutting, the braking cam part (,
)), the rotary cam (9) is automatically restored and the cutting tool (1) is returned to the cutting position. In addition, when the above-mentioned sub-type QQ rotates the rotary cam (9) to raise the thread, it can rotate freely only in the direction of the arrow as shown in Fig. 6 (a), and the screw of the rotary cam (9) It is a mechanism that does not interfere with the rounding up rotation movement, and the escape rotation in the direction of the arrow shown in FIG. , the secondary tension spring (G) returns the secondary adjustment stopper to the scratch a, and the return movement of the rotating cam (9) is caused by a combined action with the main pawl Q0, but at this time, the escape rotation of the cam The concave portions such as the motion promoting portion (e) and the escape rotation reduction portion (f) are formed by a sub-type dedicated return inclined cam portion (1) in which the sub-type aQ is provided in parallel with the portal portion.
is pressed to rotate the rotating cam (9) back, so
As shown in FIG.
can return to. As explained above, the present invention provides a contact spring (5) on the support shaft (3) in order to bring the two tank moving surfaces of the support body (4) and the movable holder (2) into close contact with each other, and also provides a contact spring (5) for the sliding spring ◇→. The pressing rod (2) and the main pawl QFJ are pressed against the rotating cam (9) by the tension force. As a result of the above action, the support (4) and the movable holder (2) to which the pipe (1) is attached are in a fixed state, and the support (4) and the movable holder (2), which are generated by the cutting movement for cutting the thread, are in a fixed state. ) and the vibration of the cutting tool caused by the attachment can be completely prevented and stability can be maintained.
Due to the regulating action of the rotation in d), thread cutting is always performed reliably at the predetermined cutting-up position, and the cutting can be done quickly and instantaneously, which has the remarkable effect of completely eliminating damage to the cutting edge. It has the great advantage of being able to maintain this state for a long time. In addition, by changing the position of the stopper a6 that limits the rotation angle of the rotating cam (9), it has a mechanism that allows you to easily switch from straight thread cutting to tapered thread cutting, which does not require a separate taper attachment like in the past. We are working to improve the sophistication and rationalization of our equipment. As explained above, the present invention has versatility, and in cutting, it is possible to perform powerful cutting at a high cutting speed using a carbide cutting tool, and it is also possible to perform precise thread cutting.
Not only has machining accuracy and efficiency been significantly improved, but the screws can be cut up reliably and the automatic return of the rotary cam has been automated, which has the great effect of eliminating mental and physical fatigue. In addition, the mechanism is simple and trouble-free, and it can be operated by simply pushing down on the handle, so no skill is required. be. 4. Brief description of the drawings The drawings show an embodiment of the present invention, FIG. 1 is a side view of a partially cutout, FIG. 2 is a plan view of a partially cutout, and FIG. 3 is a partially cutout side view. The bottom view of the notch, Figures 4 (a), (b), and (c) are explanatory diagrams schematically showing the movement mechanism in different usage examples, and Figure 5 (a) shows the main parts of the rotating cam and the brake. Plan view of rods, etc.
Figure 5 (B) is a front view with a partial cutout showing the braking rod and subpressure installed state, Figure 5 (C) is a perspective view with a partial cutout of the main part of the rotating cam, and Figure 6 (I). )(B) and (C) are partially cutaway plan views of the main pawl showing the operational relationship between the main part of the rotary cam, the main pawl, and one sub-type. 1..Bite 2..Movable holder 3..Spindle 4..Support 4..Turret mounting part 5..Close spring 6..Push down handle for return 7..Rotating lever 7..Locking Piece 8
・・Operating rod 9・・Rotating cam 10・・Stopping ring 10・・
Stopping part 11...Support shaft 12...Pushing part 13...Brake rod 13...Support shaft 14...Drawing spring 15...Main pawl 16...Sub mold 17...Shaft 17...Bearing 18...
Sub-type tension spring 18...Arm with axis 0η 19...Sub-type adjustment stopper 20...Bite escape amount adjustment device KM...Working material S...Stopper a...Taper thread tracing cam part
b...Pressure cam part b...Free part C...Brake cam part
d... Cut-up positioning part e... Escape rotation promotion part f...
・Escape rotation reduction part g...Returning inclined cam part h...Sub mold escape return part 1...Special return inclined cam part for sub mold Patent Applicant: Masaru Hanano (1 other person) Fig. 2, Fig. 3 Drawing procedure amendment (spontaneous) August 2, 1981 Patent Application No. 95074 2, Title of invention Thread cutting attachment for machine tools 3, Relationship with the person making the amendment Patent applicant “008 Yu1 ..t7730 6. The number of inventions will increase due to the amendment L8. Contents of the amendment (1) Description (correction) Page 1, line 4, 2. The scope of claims will be corrected as shown in the attached sheet. (2) In the 15th line from the top of page 4 of the specification (correction), the phrase "synthetic action" is corrected to "synthetic action." (3) Specification (correction), 10th line from the top of page 5, “
Correct the phrase "spindle support" to "spindle stop." (4) Insert p) next to Figure 6 on page 9, line 1 of the specification (correction). Above (Attachment) 2. Claims ``A cutting tool (1) is attached to a movable holder (2), and the movable holder (2) is centered on a support shaft (3) at one end.
The movable holder (2) at the other end is attached with a push-down handle (6) for return, and the support body ( 4) has a rotating lever (
7) and a locking piece <d, a rotary cam (9) having an operating rod (8), and a stop ring QO forming a stop portion Q6 for limiting the return position of the cam are fixed by a support shaft Ql), and A press rod (2) of the movable holder (2) that can be pressed against the outer circumference of the rotary cam (9) and a brake rod that is rotatably supported by a support shaft member on the support body (4). (to), insert a pulling spring α→ between this and the movable holder (2),
In a thread cutting attachment in which the operating rod (8) abuts against the stopper (S) of the lathe to rotationally drive the rotary cam (9) to cut straight or tapered threads, the braking rod (2) A main claw (T) is fixed to the tip of the rotary cam (9), which functions for braking, positioning of the rotary cam (9), return movement, etc., and a sub-type αQ is attached at an eccentric position from the center line of the tip of the free claw (T). A bearing α force is provided to the shaft aη and the free jaw (G), and the main jaw (G) is overlapped with the shaft Q? ), attach the sub-type tension spring (G) to the arm of this shaft (B), and the sub-type adjustment stopper Q to the brake lever, and also attach the rotating cam (
9) includes a tapered thread tracing cam part (a), a pressure receiving cam part (b), and a braking cam part (0) for the main pawl (to),
Concave parts such as a raised positioning part (d), an escape rotation promotion part (e), an escape rotation reduction part (f), etc. are formed, and a tilted cam part for return of the rotating cam is formed in parallel with this. (Escape return part that enables free rotation of the above subtype a)
Continuously with the sub-types a and parallel to the concave portions (e) and (r).
A dedicated return inclined cam part (1) is partially continuous with the return inclined cam part ω, and is formed in a step-like manner from the sub-mold escape return part (b),
The rotary cam automatically returns accurately to the cutting start position in conjunction with the return of the movable holder (2) by the return push-down handle (6) fixed to the movable holder (2), and thread cutting is repeatedly performed. A thread cutting attachment for machine tools featuring: ”

Claims (1)

[Claims] A cutting tool (1) is attached to a movable holder (2), and the movable holder (2) is tightly attached to a support (4) around a support shaft (3) at one end. Rotatably supported by a contact spring (5),
The movable holder (2) at the other end has a push-down handle (6) for return.
A rotary cam (9) having a rotary lever (7) and an operating rod (8) is mounted on the support body (4), and a restraint Idol for limiting the return position of the cam is rotatably fixed by a support shaft 01. The press rod (6) of the movable holder (2), which can be pressed against the outer periphery of the rotating cam (9), and the support body (
4) is equipped with a brake lever (2) that is pivoted and rotated by a support shaft 6, and a pulling spring is installed between this and the movable holder (2).
In a thread cutting attachment that enables cutting of straight or tenth threads by inserting the operating rod (8) into contact with the stopper (S) of the lathe and rotationally driving the rotary cam (9), the above-mentioned braking At the tip of the rod (l), a main pawl α is fixed, which also serves as a brake for the rotary cam (9), for positioning the rotary cam (9), and for return movement. A bearing α is provided on the axis α and the main pawl (G) of the sub-type Qf9, and it is rotatably attached to the main pawl Q by the axis α, and a sub-type tension spring (G) is attached to the axis Qη arm of the sub-type Qf9. A sub-type adjustment stopper Q is attached to the braking rod α arm, and the rotary cam (9) has a taper thread tracing cam part (a), a pressure receiving cam part (1)) and a braking cam part for the main pawl QfD. In addition to (0), the cut-up positioning part (in), the escape rotation promotion part (e),
A concave part such as an escape rotation reduction part (f) is formed, and in succession to this, an inclined cam part (g) for returning the rotating cam, and a free rotation of the above-mentioned sub-type α for auxiliary return in parallel with this. Escape section (
Continuing with h), the sub-type OQ exclusive return inclined cam part (1) parallel to the above-mentioned concave parts (e) l (f) is partially continuous with the return inclined cam part (g) in a step-like manner. The rotating cam automatically returns to the cutting start position accurately in conjunction with the return of the movable holder (2) by the return push-down handle (6) fixed to the movable holder (2), and thread cutting is completed. An attachment for thread cutting on machine tools that is characterized by repeated cutting.