JPH1128678A - Insert tool for screw insert - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insert tool for screw insert which can insert the screw insert easily even when only a mandrel can be exchanged and the insert depth of the screw insert is changed slightly, and requires no correct control of the reversing time of a motor. SOLUTION: A mandrel 20 which moves forward or backward in accordance with CW, and CCW, rotations of a motor 3 is separated from a clutch member 12 and attached so that it can be adjusted in position axially to the clutch member 12. On the both ends of the mandrel 20, grooves to grasp tongue of the screw insert are provided, and male screws 20a and 20b which are necessary for the insert of the screw insert are installed. A spring 13 is provided to energize the tip of the mandrel 20 to about without screw fitting with a guide female screw 23a of a prewinder 23 when an insert tool 1 is not operating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw insert insertion tool for inserting a screw insert into a female screw made of a soft material.

[0002]

2. Description of the Related Art In general, a screw insert is formed by winding a diamond-shaped wire rod into a coil shape as shown in FIG. 8 and forming a linear portion (tang) 38 at one end. Used for strengthening screws and repairing screw holes. To insert the screw insert 37 into the female screw, use an insertion tool as shown in JP-A-4-201182 and JP-A-6-320440, hook the tongue at the tip of the screw insert on the mandrel, The screw insert is screwed into the female screw while rotating with the mandrel.

That is, in a conventional screw insert insertion tool, as shown in FIG. 6, the rotation of a motor 100 is transmitted to a spline shaft 101 via an adapter 111, and a head 102 and a clutch which are spline-fitted to the spline shaft 101. 1
The rotation is transmitted to the mandrel 104 via 03, and this rotates. Since the tip of the mandrel 104 is screwed into the guide screw 106 of the prewinder 105, the mandrel 104 moves forward while rotating. The mandrel 104 enters the screw insert 37 (not shown in FIG. 6) set in the supply port 108, the tip of the mandrel 104 sandwiches the tongue 38, and advances while rotating the screw insert 37 together. The screw insert 37 and the mandrel 104 are inserted into the female screw W1 of the work W while being guided by the tip guide screw 107. Screw insert 3
The insertion depth of 7 is regulated by the collar 109. The rotation of the motor 100 is controlled manually or by a timer or the like. After insertion, the rotation is reversed and the mandrel 104 is removed from the work W.

The conventional mandrel 104 is connected to the head 102 via a clutch 103 as shown in FIG.
Is composed. Therefore, there are the following problems.

[0005] 1. The tip of the mandrel 104 is provided with a groove for catching the tongue 38 of the screw insert 37, through which rotation is transmitted to the screw insert 37,
A large torque is required because the groove is inserted into the female screw W1 of the work W, which often causes the groove to be worn or chipped, and the mandrel unit 110 is replaced every time, which is uneconomical. 2. The mandrel 104 includes the clutch 103 and the head 10
2 and a unit, and the mandrel 104 is screwed into the prewinder 105 to maintain a fixed positional relationship with the insertion tool.
The total length of the mandrel 104 cannot be adjusted. Therefore, in order to minutely change the insertion depth of the screw insert 27, it is necessary to increase the number of collars having a stopper function or to slightly cut the collars, which requires time and effort. 3. After the screw insert 37 is inserted, the motor 100
Is reversed and the mandrel 104 is extracted,
If the motor 100 rotates too much, the mandrel 104 continues to rotate with the head 102 abutting against the adapter 111, bites into the female screw of the prewinder 105 and is locked, and the motor 100 cannot be driven next.

[0006]

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to make it possible to replace only a mandrel and to easily change the insertion depth of a screw insert even slightly. Another object of the present invention is to provide a screw insert insertion tool which does not require precise control of the reverse rotation time of the motor.

[0007]

In order to achieve this object, a screw insert insertion tool according to the present invention is a screw insert insertion tool for inserting a screw insert having a tongue at one end into a female screw of a work. a) a sleeve, (b) a spline shaft rotatably supported by the sleeve, and (c) a spline fit with the spline shaft;
A head provided on one end of the sleeve and movable in the axial direction with respect to the spline shaft; (d) a first clutch half provided in the head and fixed to the head; A clutch comprising a first clutch half and a second clutch half movably provided; (e) a motor for driving the spline shaft, the head and the clutch to rotate forward and backward; and (f) a screw. It has a supply port for the insert, a female guide screw for guiding the mandrel and a female guide screw for guiding the screw insert formed with the supply port interposed, and is attached to one end of the sleeve so as to be movable in the axial direction. A pre-winder, (g) a first male screw that can be screwed with the guide female screw and that can be screwed into the screw insert and pass through the distal end guide female screw; A mandrel having a second male screw removably screwed into the sleeve, and advancing or retreating in the axial direction of the sleeve in accordance with the forward / reverse rotation of the motor; and (h) a mandrel in the axial direction of the prewinder. Mandrel fine adjustment means for finely adjusting the position of the mandrel; and (i) provided between the head and the other end of the sleeve, wherein the first male screw of the mandrel is provided with the guide female screw of the prewinder. A spring that makes the distal end abut on the end opposite to the supply port of the guide female screw in a non-operating state that has come off to the sleeve side, and the tongue of the screw insert engages both ends of the mandrel. The first male screw and the second male screw have the same shape and size. The mandrel fine-adjustment means includes a shaft protruding from the second clutch half toward the prewinder, a second male screw of the mandrel screwed with the shaft, and a screw of the shaft screwed onto the male screw. And a lock nut abutting on the free end.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. 1 and 2 are sectional views showing an insertion tool for a screw insert according to the present invention.
FIG. 2 shows a state immediately before the screw insert is inserted into the female screw of the work, and FIG. 2 shows a state after the insertion.

As shown in FIGS. 1 and 2, reference numeral 1 denotes an insertion tool.
It has a sleeve 2, a mandrel 20, a pre-winder 23, a motor 3 for rotating and driving the mandrel 20, and the like.

A spline shaft 5 is rotatably supported in the sleeve 2. A female spline 6 is provided on the inner periphery of the spline shaft 5, and a male spline 9 provided on the outer periphery of the head 8 is spline-fitted. The head 8 rotates together with the spline shaft 5 and can move in the axial direction. It has become. The head 8 has a first clutch half 1
0 is integrally attached by a pin 14 or the like, and a second clutch half 11, which is paired with the second clutch half 11, is slidably provided with respect to the head 8.
The concave portion 11a of the second clutch half 11 is always meshed with the convex portion 10a of the first clutch half 10 by the spring 16 interposed between the first clutch half 10 and the second clutch half 11. The two clutch halves 10 and 11 constitute a clutch member 12 (FIGS. 1 and 2). The tip of the second clutch half 11 is a shaft 15, on which a mandrel 20 is attached. A first male screw 20a and a second male screw 20b are screwed on both ends of the mandrel 20, and the second male screw 20b is screwed into the shaft 15 in FIGS. Thus, the mandrel 20 is fixed to the shaft 15. By loosening the lock nut 21, the mandrel 20 can freely adjust the amount of movement into and out of the shaft 15.

A first male screw 20a and a second male screw 20b
Are identical to each other, and each male screw 20a, 20
As shown in FIG. 3, each male screw 2
A central groove 30 having the same inclination as the lead angles 0a and 20b is formed. Both sides of the central groove 30 are vertical surfaces 31 and 3
It is 2. The vertical surface 31 is cut off obliquely and is connected to an inclined surface 33, and the vertical surface 32 is connected to a conical inclined surface 34 formed in a part thereof.

Since a large torque is required for hooking the tongue 38 into the groove 30 and screwing the screw insert 37 into the female screw W1 while rotating the screw insert 37, the groove 30 is worn or worn. If there is a groove 30 at only one end of the mandrel, it loses its function as a mandrel and becomes unusable.

On the other hand, as in the present invention, the same groove 30 and the same male screw 20a, 20b are provided at both ends of the mandrel 20.
When one of the grooves 30 is chipped or worn, the lock nut 21 is removed, the first male screw 20a is screwed into the shaft 15, and the groove 30 on the second male screw 20b side is tangled. Can be hooked. In other words, one mandrel can be used for two, and there is an advantage that the life of the mandrel 20 can be doubled and the mandrel 20 can be used efficiently.

In front of the sleeve 2, a pre-winder 2
3 is provided slidably in the axial direction within the range of the gap S as shown in FIG. Reference numeral 25 denotes a screw pin screwed into the sleeve 2, which fits into a groove 26 formed in the prewinder 23 in its axial direction, so that the prewinder 23 does not rotate. A nut 27 is provided so that the prewinder 23 does not come off the sleeve 2.
The pre-winder 23 has a first female screw (guide screw) 23a for guiding the mandrel 20 across the supply port 24 of the screw insert 37, and a second female screw for guiding the screw insert 37 attached to the mandrel 20. A screw (tip guide screw) 23b is provided.

Reference numeral 13 denotes a spring which is interposed between the head 8 and the adapter 4 at the rear end of the sleeve 2.
In the direction of arrow A. Before the screw insert 37 is inserted, that is, in the initial state, the clutch 12 is at the position indicated by the two-dot chain line, and the tip of the mandrel 20 is moved by the spring 13 to the end of the guide screw 23a of the pre-winder 23 (the supply port 24).
And the opposite end).

The adapter 4 is attached to the motor shaft of the motor 3 and is screwed to the spline shaft 5. For this reason, when the motor 3 is rotationally driven, the mandrel 20 is rotated via the spline shaft 5, the female spline 6, the male spline 9, the head 8, the clutch member 12, and the shaft 15.
Rotates. When the mandrel 20 rotates, the male screw 20a
Is inserted in the insertion direction (arrow A) while being guided by the guide screw 23a.
(Direction), and grasps the screw insert 37 as described later, and is inserted into the female screw W1 integrally therewith.
The pre-winder 23 has a collar 28 (2 in FIGS. 1 and 2).
), And has a stopper function for stopping the head 8 by pressing it. The number of the collars 28 can be adjusted by changing the number of the collars 28 according to the length or the insertion depth of the screw insert 37, and the finer insertion depth can be adjusted by loosening the lock nut 21 as described above.
This can be done by making the 0 slightly move in and out of the axis 15. Here, the shaft 1 of the second clutch half 11
5, The second male screw 20b of the mandrel 20 and the lock nut 21 constitute a mandrel fine adjustment means.

FIGS. 4 and 5 show a state in which the screw insert 37 is attached to the mandrel 20. FIG. The tongue 38 of the screw insert 37 fits into the groove 30 and the mandrel 2
When 0 rotates in the direction of arrow B, the tongue 38
Is pushed in the direction of arrow C (FIG. 4) by the vertical surface 32 in the direction of arrow D (FIG. 4), whereby the screw insert 37 rotates with the mandrel 20 in the same direction about 35 as the center of rotation. When the mandrel 20 is rotated in the direction opposite to the arrow B in a state where the screw insert 37 is completely inserted into the female screw W1, the inclined surface 33 and the conical inclined surface 34 slide on the tongue 38, so that only the mandrel 20 is rotated. It is extracted while rotating.

Next, the operation of the present invention will be described. First, the screw insert 37 is set in the supply port 24. At this time, the tongue 38 is set so as to face the tip guide screw 23b, the center of the mandrel 20 is made to coincide with the center of the female screw W1, and the prewinder 23 is placed near the female screw W1 (0.1 to 0.2 mm). Position.

The motor 3 is rotated forward, and the mandrel 20 is rotated forward. Since the spring 13 pushes the head 8 in the insertion direction (the direction of arrow A) (FIG. 1), the male screw 20a is guided by the guide screw 23a by the forward rotation of the mandrel 20, and moves while rotating in the direction of arrow A. . The male screw 20a of the mandrel 20 is the guide screw 23
a, and further through the screw insert 37,
The tongue 38 is sandwiched between the grooves 30 at the tip of the mandrel 20. Thus, the screw insert 37 rotates with the mandrel 20 while rotating the pre-winder 23.
Is inserted into the female screw W1 while being guided by this. At this time,
Since the prewinder 23 has a play of the gap S in the insertion direction, until the screw insert 37 bites into the female screw W1,
The deviation of the screw phase can be absorbed. The screw insert 37 is inserted into the female screw W1 together with the mandrel 20.

The tip of the head 8 hits the collar 28,
Although the first clutch half 10 cannot move forward, the second clutch half 11 moves forward, and finally, the chamfered portion formed on the outer edge of the concave portion 11a of the second clutch half 11 on the positive rotation torque transmitting side is changed to the first clutch half. 10 convex parts 1
0a slips, and the second clutch half 11 comes off the first clutch half 10. This allows the screw insert 37
Is inserted at a predetermined depth. This clutch 1
The rotation of the mandrel 20 is stopped by the disengagement of 2.

Here, the motor 3 is rotated in the reverse direction. At this time, since the force is applied to the second clutch half 11 toward the first clutch half 10 by the spring 16, the concave portion 11 a immediately engages with the convex portion 10 a and the clutch 12 is engaged immediately after the reverse rotation. As a result, the mandrel 20 reverses, the tongue 38 comes off from the groove 30, and only the mandrel 20 rises while reversely rotating and comes out of the work W. The mandrel 20 continues to rotate in the reverse direction, passes through the tip guide screw 23b and the guide screw 23a, and then idles.

When the mandrel 20 continues to rotate in the reverse direction and the male screw 20a comes off from the guide screw 23a, the mandrel 20 is moved by the spring 13 to the arrow A as described above.
Therefore, the tip of the mandrel 20 is rotated by abutting the end of the guide screw 23a of the prewinder 23 on the head 8 side. Therefore, unlike the conventional case, the male screw 20a does not bite into the guide screw 23a and is locked, so that the insertion of the next screw insert 37 is not hindered.

Next, the screw insert. If there is a variation in the length of the 37 or a variation in the depth of the female screw W1, it is necessary to finely adjust the insertion depth. In this case, the lock nut 21 is loosened, the protrusion amount of the mandrel 20 with respect to the shaft 15 is finely adjusted by an amount corresponding to the fine adjustment of the insertion depth, and the lock nut 21 may be tightened again.

Further, the insertion tool 1 of the present invention is incorporated into a robot or the like, and the screw insert 37 is automatically turned into a female screw W1.
When used to insert the motor 3, the driving of the motor 3 can be controlled by a timer.

That is, the timer is turned on, whereby the motor 3 rotates forward and the mandrel 20 rotates forward. As described above, the male screw 20a is guided by the guide screw 23a, passes through the screw insert 37, and the tongue 38 of the screw insert 37 fits into the groove 30 of the mandrel 20. Further, the mandrel 20 and the screw insert 37 are guided by the tip guide screw 23b and inserted into the female screw W1. When the clutch 12 is disengaged, the screw insert 37 is inserted to a predetermined depth, and when the timer is turned off, the motor 3
Rotation stops. Next, when the timer is turned on again, the motor 3 rotates in the reverse direction, the mandrel 20 also rotates in the reverse direction, and the motor 3 comes out of the screw insert 37 inserted into the work W. The mandrel 20 continues to rotate as it is, and the tip guide screw 2
3b, pass through the guide screw 23a, and then idle. When the timer is turned off, the motor 3 stops rotating, and the mandrel 20 also stops reverse rotation. Then, screw insert 3
It is checked whether or not there is a female screw W1 of the work W into which 7 is to be inserted. If not, the operation is terminated. If there is, the above operation is repeated.

[0026]

As described above, according to the screw insert insertion tool of the present invention, the following effects can be obtained. 1. By providing the mandrel function at both ends of the mandrel, one mandrel can be used even if one mandrel becomes unusable due to chipping or abrasion, making it possible to use one mandrel Can be used for two bottles. 2. Since the mandrel can be separated from the clutch member and its length can be finely adjusted, even when finely adjusting the insertion depth of the screw insert, it can be easily performed by finely adjusting the total length of the mandrel. it can. 3. The male screw of the mandrel is configured to come off the guide screw of the pre-winder, and the male screw tip is configured to press against the guide screw, so that the male screw bites into the guide screw and is locked as before. No failure occurs.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an insertion tool of the present invention, showing a state immediately before a screw insert is inserted.

FIG. 2 is a cross-sectional view of a part of the insertion tool, showing a state where the screw insert has been completely inserted.

FIG. 3 is a perspective view showing a shape of a tip of a mandrel.

FIG. 4 is an end view showing a state where a screw insert has entered a groove of a mandrel.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view showing a conventional insertion tool.

FIG. 7 is a partial sectional view showing a conventional mandrel unit.

FIG. 8 is a perspective view of a screw insert.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 insertion tool 2 sleeve 3 motor 5 spline shaft 6 female spline 8 head 9 male spline 12 clutch member 13 spring 15 shaft 16 spring 20 mandrel 20a, 20b male screw 21 lock nut 23 prewinder 23a guide screw 23b tip guide screw 28 collar 30 Groove 31, 32 Vertical surface 37 Screw insert 38 Tongue W Work W1 Female screw

Claims (2)

[Claims] 1. A screw insert insertion tool for inserting a screw insert having a tongue at one end into a female screw of a work, comprising: (a) a sleeve; (b) a spline shaft rotatably supported by the sleeve; (C) a head that is spline-fitted to the spline shaft and is provided at one end of the sleeve and is movable in the axial direction with respect to the spline shaft; and (d) is provided in the head and fixed to the head. (E) a clutch comprising a first clutch half and a second clutch half provided in a disengageable and movable manner with respect to the first clutch half in the axial direction of the head; and (e) the spline shaft, the head and the clutch. A motor for forward and reverse rotation, (f) a screw insert supply port, a guide female screw for guiding the mandrel and a screw insert guide formed between the supply port, A prewinder having a distal end guide internal thread and axially movably attached to one end of the sleeve; and (g) the distal end guide internal thread capable of screwing with the guide internal thread and screwing into the screw insert. And a mandrel having a second male screw removably screwed to the second clutch, and advancing or retreating in the axial direction of the sleeve in accordance with forward and reverse rotation of the motor. (H) a mandrel fine adjustment means for finely adjusting the position of the mandrel in the axial direction of the pre-winder; and (i) provided between the head and the other end of the sleeve; (1) A split in which the male screw is pulled out from the female guide screw of the prewinder to the sleeve side and the leading end abuts on the end of the female guide screw on the side opposite to the supply port. A screw insert, wherein the mandrel has grooves at both ends for engaging the tongues of the screw insert, and wherein the first male screw and the second male screw are formed in the same shape and size. Insertion tool. 2. The method according to claim 2, wherein the mandrel fine adjustment means is configured to
A shaft protruding from a clutch half toward the prewinder, a second male screw of the mandrel screwed to the shaft, and a lock nut screwed to the male screw and abutting on a free end of the shaft. 2. An insertion tool for the screw insert according to 1.