JPH0226627Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a nut tightening tool that receives a nut from a delivery unit and tightens the nut onto a predetermined bolt.

(Prior Art) Conventionally, as this type of nut tightening tool, there is one described in, for example, Japanese Patent Application No. 102105/1985 filed by the present applicant. This device forms part of an automatic assembly unit for automobile tires, and includes a nut take-out unit that takes out nuts from a magazine that stores a large number of tire fixing nuts in an array, and a delivery unit that delivers nuts from this take-out unit. The nut is supplied by the unit to the nut fastener, which tightens the nut onto the hub bolt of the wheel hub on which the tire is mounted.

To explain more specifically with reference to FIG. 3, reference numeral 1 denotes a nut transfer socket attached to the frame 2 and located at the nut transfer position (position shown in the figure);
The nut passing socket 1 has a portion 4a with a regular hexagonal cross section into which a nut 3 can be inserted and held, and a portion 4b with a circular cross section.
It has a nut holding hole 4 (transfer side nut holding hole) consisting of. The frame 2 is configured to move together with the nut transfer socket 1 between a position where the nut transfer socket 1 receives a nut 3 from a nut take-out unit (not shown) and the nut transfer position. A cylinder (for example, an air cylinder), which is not shown, is supported integrally with the cylinder. 6 is a nut runner socket having a substantially cylindrical shape. This nut runner socket 6 is rotatably supported around an axis by a holding plate 7 and a guide bush 8 as supporting means, and has a regular hexagonal cross section into which a nut 3 can be inserted and held on the tip surface of one end. Nut holding holes 9 (receiving side nut holding holes) are provided concentrically. 10 is a nut runner which is connected to an electric motor (not shown) and serves as a rotational drive means for rotating the nut runner socket 6;
a is a drive shaft of the nut runner 10 that can rotate in forward and reverse directions. This drive shaft 10a is connected to a shaft hole 11 provided in the tip surface 6a of the other end of the nut runner socket 6.
The nut runner socket 6 is fitted into the nut runner socket 6 and rotated around its axis. A compression coil spring 12 is interposed between the nut runner 10 and the other end surface 6a of the nut runner socket 6, and biases the nut runner socket 6 toward one end thereof. the nut runner socket 6;
The guide bush 8, nut runner 10, and compression coil spring 12 are integrally supported by the holding plate 7, and are driven together with the supporting plate 7 by a moving means such as an air cylinder (not shown), so that the nut holding hole 9 is connected to the nut in the nut passing socket 1. Nut delivery position (third
position shown), and a nut screwing position (not shown) where the nut 3 is screwed into the hub bolt (not shown),
It is designed to move back and forth between the two. Reference numeral 14 denotes a nut pusher which is provided concentrically with the nut holding hole 4 of the nut transfer socket 1 and can enter and exit from the circular cross-section portion 4b side of the nut holding hole 4. and,
This nut pusher 14 is driven by the cylinder supported by the frame 2, and when the nut runner socket 6 stops at the nut delivery position, it enters the nut holding hole 4, pushes the nut 3 out of the nut holding hole 4, and then tightens the nut. It is designed to be pushed into the nut holding hole 9 of the runner socket 6. These nut passing sockets 1, frame 2,
The cylinder and the nut pusher 14 constitute a delivery unit.

When the empty nut runner socket 6 with the nut 3 screwed into the bolt at the nut screwing position (not shown) returns to the nut delivery position and stops,
The nut pusher 14 is driven to enter the nut holding hole 4 of the nut transfer socket 1 and push out the nut 3. At this time, the nut runner socket 6 is driven by the nut runner 10 and rotates at a low speed. Therefore, the nut 3 pushed out from the nut holding hole 4 is pressed against the entrance of the nut holding hole 9 of the nut runner socket 6, and as the nut runner socket 6 rotates, the cross-sectional phase of the nut 3 and the nut holding are adjusted. When the phase of the hole 9 matches, the nut is inserted into the nut holding hole 9.

(Problem to be Solved by the Invention) However, in the case of such a conventional nut tightener, the nut 3 has a cross-sectional phase, in other words, the nut holding hole 4 of the nut passing socket 1 has a cross-sectional phase. There is no means for matching the cross-sectional phases of the nut holding hole 9 of the runner socket 6 and stopping the nut runner socket 6 while pressing the nut 3 against the entrance of the nut holding hole 9 of the nut runner socket 6. is rotated at a low speed, and the nut 3 is fitted into the nut holding hole 9 only when the phase of the cross section of the nut 3 and the phase of the cross section of the nut holding hole 9 match. Therefore, if the rotational speed of the nut runner socket 6 is too high or the pushing force of the nut 3 by the nut pusher 14 is too weak, it will be difficult for the nut 3 to fit into the nut holding hole 9, and these rotational speeds and pushing force It is difficult to adjust the nut 3, and it takes time until the cross-sectional phases of the nut 3 and the nut holding hole 9 match and the nut 3 is inserted, resulting in poor work efficiency. Furthermore, since the nut 3 is pressed against the rotating nut runner socket 6, there is a problem that the nut runner socket 6 and the nut 3 are easily scratched.

This idea was developed with a focus on these problems, and by stopping the rotation of the nut runner socket in advance with the nut holding holes on the delivery side and the receiving side aligned in phase, The purpose is to improve work efficiency by making nut delivery easy, reliable, and quick, and to eliminate scratches on nut runner sockets and nuts.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a nut passing socket having a passing side nut holding hole with a regular polygonal cross section, and a nut held in the nut passing socket on the passing side. A nut tightening tool in which a nut is delivered by a delivery unit having a nut pusher pushed out in the axial direction from a nut holding hole, the nut having a same cross section as the delivery side nut holding hole at the shaft center so as to fit and hold the nut. A nut runner socket having a side nut holding hole, a support means for rotatably supporting the nut runner socket around the central axis of the receiving side nut holding hole, a rotation driving means for rotating the nut runner socket, and a support means. and a moving means for moving the passing nut holding hole and the receiving side nut holding hole so that they coaxially oppose each other, the nut tightening tool having a cross section of the receiving side nut holding hole on the outer periphery of the nut runner socket. A receiver having a plurality of engaging parts having the same number as the number of angles and provided at equal intervals and a ratchet supported by the supporting means so as to engage with the engaging parts, and facing concentrically with the passing nut holding hole. The nut runner socket can be locked to the support means via the racket at a rotational position where the corner in the cross-sectional shape of the side nut holding hole matches the rotational phase of the corner in the cross-sectional shape of the transfer side nut holding hole. A locking means is provided.

(Function) In the present invention, the supporting means is moved by the moving means so that the passing side nut holding hole and the receiving side nut holding hole are concentrically opposed, and in this state, the nut runner socket is moved by the rotational driving means. The locking means is rotationally driven and has a plurality of engaging portions provided on the nut runner socket and a ratchet supported by the supporting means to engage with the engaging portions, so that the nut holding hole on the transfer side and the receiving portion are connected to each other. The nut runner socket is locked to the support means at a rotational position where the rotational phase of the corner in cross section with the side nut holding hole matches each other.

Therefore, before the nut is transferred from the transfer unit to the runner socket, the rotation of the nut runner socket is stopped at a predetermined rotational position, and in this state, the nut is pushed out from the nut holding hole on the transfer side by the nut pusher. Then, the nut is not pressed against the end face of the nut runner socket, but is easily and reliably inserted into the receiving nut holding hole and held. As a result, the working efficiency of nut transfer is greatly improved, and the nut runner socket and the nut are less likely to be scratched.

(Example) This invention will be explained below based on the drawings.

Figures 1 and 2 are diagrams showing an embodiment of this invention. First, the configuration will be explained. The same parts as those in the conventional system will be given the same reference numerals, and the explanation thereof will be omitted, and only the different parts will be explained. In the figure, reference numeral 16 denotes a nut runner socket, and on the outer circumferential surface of the other end, six axially serrated cross-sections, the number of which is the same as the number of cross-sectional angles of the nut holding hole 9, are arranged in the axial direction. Projections 17 (engaging portions) are provided at equal intervals from each other. 18 is an axis parallel to the nut runner socket 16 which is fixed to the holding plate 7 in the vicinity of the nut runner socket 16. A ratchet 19 is rotatably attached to one end of the shaft 18, and its distal end pawl 19a is in contact with the outer peripheral surface of the nut runner socket 16 and can be engaged with the protrusion 17. In FIG. 2, 20 projects from the retaining plate 7 adjacent to the shaft 18, so that when the ratchet 19 attempts to rotate in the clockwise direction in FIG.
This is a stopper that comes into contact with this to prevent rotation in the same direction. When the ratchet 19 engages one of the protrusions 17 and comes into contact with the stopper 20 to prevent the nut runner socket 16 from rotating in the counterclockwise direction (in FIG. 2), the nut runner socket 16 is adapted to take a rotational direction position where the phase of the cross section of the nut holding hole 9, which has a regular hexagonal cross section, matches the phase of the cross section of the regular hexagonal cross section portion 4a of the nut holding hole 4 of the nut transfer socket 1. That is, the shaft 18, the ratchet 19, and the stopper 20, together with the protrusion 17, are in a state in which the rotational phases of the corners of the cross-sectional shapes of the nut holding hole 4 on the transfer side and the nut holding hole 9 on the receiving side match, that is, on the transfer side. A locking means 21 is configured to lock the nut runner socket 16 to the holding plate 7 at a rotational position where the nut 3 from the nut holding hole 4 can be fitted and held in the nut holding hole 9 on the receiving side.

Next, the effect will be explained.

The nut transfer socket 1, into which the nut 3 has been previously inserted into the nut holding hole 4 by a nut takeout unit (not shown), is stopped at the nut transfer position by the movement of the frame 2, and the nut runner socket 16 operates the cylinder 30 as a moving means. When the nut is moved to the nut transfer position (the position shown in FIG. 1) and stopped, the nut runner 10 rotates the nut runner socket 16 counterclockwise at a low speed. As a result, the ratchet 19 catches on the radial wall surface 17a of the protrusion 17, as shown in FIG. 2, and attempts to rotate clockwise about the shaft 18. However, stopper 20 is ratchet 1.
9 and prevent rotation in the same direction, the nut runner socket 16, which is engaged with the ratchet 19 via the protrusion 17, is also prevented from rotating and stopped.
Therefore, the nut pusher 14 operates, and the nut 3
Push out from nut holding hole 4. At this time, the nut runner socket 16 stops at a rotational position where its nut holding hole 9 coaxially faces the nut holding hole 4 of the nut transfer socket 1 and the rotational phases of the corners of the regular hexagonal cross section match each other. Therefore, the nut 3 pushed out from the nut holding hole 4 is directly inserted into the nut holding hole 9 of the nut runner socket 16.
will be inserted into. Thereafter, the nut runner socket 16 moves to a nut screwing position (not shown). Nut runner socket 16 in nut screwed position
Rotate clockwise as shown in Fig. 2, and insert the nut 3, which has been fitted and held in the nut holding hole 9, onto the specified bolt.
In other words, when tightening a hub bolt (not shown), the ratchet 19 is not restricted by the stopper 20, so it is pushed by the protrusion 17 and rotates counterclockwise about the shaft 18. It simply slides on the surface without interfering with the rotation of the nut runner socket 16.

(Effect of the invention) As explained above, according to this invention, the locking means changes the phase of the cross section of the nut holding hole on the receiving side of the nut runner socket to the phase of the cross section of the nut holding hole on the passing side of the nut passing socket. In other words, the nut runner socket is locked to the support means at a rotational position where the nut from the delivery unit is fitted into and held in the receiving side nut holding hole. The nut can be easily, reliably, and quickly delivered to the nut holding hole, and the work efficiency is high. In addition, there is no need to rotate the nut runner socket and press the nut against it, as in the past. There is no risk of scratches on the nut runner socket or nut.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the nut fastener according to this invention, with Figure 1 being a front sectional view of the main part thereof, and Figure 2 being a sectional view taken along the - arrow in Figure 1. , FIG. 3 is a front sectional view of the main parts of a conventional nut fastener. 1... Natsuto passing socket, 3... Natsuto, 4
... Nut holding hole (handling side nut holding hole), 7...
...Holding plate (supporting means), 8... Guide bush (supporting means), 9... Nut holding hole (receiving side nut holding hole), 10... Nut runner (rotation drive means), 14... Nut pusher, 16...
Nut runner socket, 17... protrusion (engaging portion), 19... ratchet, 21... locking means,
30...Cylinder (moving means).

Claims (1)

[Scope of utility model registration request] A nut tightening device in which a nut is transferred by a delivery unit having a nut transfer socket having a transfer side nut holding hole with a regular polygonal cross section and a nut pusher that pushes out the nut held in the nut transfer socket in the axial direction from the transfer side nut holding hole. a nut runner socket having a receiving side nut holding hole having the same cross section as the transfer side nut holding hole at the shaft center so as to fit and hold the nut; and a nut runner socket having a receiving side nut holding hole. a support means for rotatably supporting the nut runner socket around a central axis; and a rotation drive means for rotating the nut runner socket.
a moving means for moving the supporting means to make the delivery side nut holding hole and the receiving side nut holding hole face each other concentrically;
In the nut tightening tool, the nut runner socket has a plurality of engaging portions provided at equal intervals on the outer periphery of the nut runner socket in a number equal to the number of cross-sectional angles of the receiving side nut holding hole, and a plurality of engaging portions that are engaged with the engaging portions. a ratchet supported by the supporting means such that a corner in a cross-sectional shape of the receiving-side nut holding hole coaxially opposed to the passing-side nut holding hole rotates a corner in the cross-sectional shape of the passing-side nut holding hole; A nut tightening device characterized in that it is provided with locking means capable of locking the nut runner socket to the support means via the ratchet at a rotational position that matches the phase.