JPS59142075A - Nut clamping machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nut tightening machine that tightens automatically supplied nuts on hook claws.

Conventionally, as this type of nut tightening machine, those shown in Fig. 6+a+ and Fig. 6(b)c are generally used. This nut tightening machine Il+ has a mechanism that can be raised and lowered.

A rotatable box bit (31) is disposed on this chuck (2) so as to be movable up and down, either integrally with the chuck (2) or independently.
) has a hexagonal hole (5) at the tip, and the hexagonal hole (5)
A guide bin (6) is retractably arranged so as to coincide with the center of the guide bin (6). At the tip of the chuck (2), a pair of chuck claws (19a) (19b) are attached to a box bit (31).
It is held so that it can be opened and closed so as to block the movement path of the.

The chuck jaws (19a) Q9b) have the box bit (narrow matching the precision of 31) +41 holding hole and a connecting hole (aSt) that communicates with the holding hole aSt by raising the height position of the bottom surface. (not shown) is formed. Further, a guide member (not shown) is fixed to the chuck (2), and a guide hole (not shown) having an arcuate longitudinal section is bored in this guide member. This guide hole is configured to communicate with the holding hole through a connecting hole, and is configured such that the nut (4) fed through the guide hole reaches the end of the holding hole.

In the above nut tightening machine, chuck jaws (19aX19b)
When screwing the nut (4) supplied above into the desired two studs, the box bit (31) is lowered, the guide pin (6) passes through the inner hole of the nut (14+), and then the stud At the same time, the box bit (3) spreads out the chisel claws (19a) and (19'b) to cause the nut (+4) to fall along the guide pin (6).

Therefore, when the nut (4) comes into contact with the stud, the nut (4) may be positioned diagonally toward the stud, causing the nut (4) to have a box bit.

(Hexagonal hole (5) of 31 is fitted and empty) 14+ 1
When this rotation is transmitted, the nut (4) engages the stud (24).
1, the nut (4) may not be able to be screwed in to the desired position, resulting in poor tightening.

The present invention aims to eliminate the above-mentioned drawbacks, and embodiments thereof will be described below with reference to the drawings. 1 and 4, a1) is a nut tightening machine fixed to an arm (not shown) of an industrial robot (not shown), and this nut tightening machine 11+ has a chuck (21). This chuck (2) has one rotatable box bit (31), and this box bit (3) and chuck (2)
) can be raised and lowered integrally with the box bit (3) or by the box bit (3) alone. In addition, a hexagonal hole (51) having a shape corresponding to the desired hole (14H) is provided at the tip of the box bit (3), and a retractable guide pin 16) is provided at the center of this hexagonal hole (5). Placed τ duck. This guide bottle 16) protrudes sufficiently beyond the tip of the box bit (3), and its tip is located close to the nut holding hole (71-), which will be described later. A steel ball (8) protruding from the surface of the hole is arranged so as to be retractable, and the nut (4) can be held by the guide pin (6).

The chuck (2) has a pair of guide claws (9a) ψb)
is arranged so that it can be opened and closed freely, and this guide claw (9a) (
The tip of the box bit (9b) is biased by a spring tn+t so as to block the movement path of the box bit (3). Further, this guide pawl (9a) and the opposing guide pawl (9b) are configured to form a tapered hole α11 against which the box bit (3) comes into contact when descending, and a first pin passage hole a communicating with the tapered hole α11. There is. Further, a guide groove O perpendicular to the first pin passage size α2 is cut into this guide claw ψa) (9b).

On the other hand, as shown in Fig. 2, an upper arm part I and a lower arm part 1151 are provided on the back of the chassis (2), and these two guide shafts O61 are fixed in parallel. . This guide shirt) has a sliding block αη that is freely slidable and is always biased upwardly by a support spring aI, and the sliding block αη has a pair of chuck claws (19a) ( 19b) It is arranged so that it can be opened and closed by force. This chuck claw (19a) (19'b)
The tip of the box via 131 is biased by a spring so as to block the moving path of the box via 131, and one of the guide claws (9a) and (9b) is positioned below the guide claws (9a) and (9b). The chuck claw (19a) is connected to the guide claws (9a) (9b) together with the opposing chuck claw (19'b).
) is configured to form a nut holding hole 17) corresponding to the guide groove 03 of the nut holding hole +71).
and the guide groove aJ are configured to form a passage for the nut. Also, chuck claws (19a) (19
b) is configured to form a second pin passage hole whose center coincides with the first pin passage hole 02+ formed by the guide claws (9a) ψb)t. Further, the chuck jaws (19a) (Q9b) have a chamfer on the inner side thereof as the sliding block surface descends.
When the chuck 9b) is lowered, its cam surface comes into contact with the chuck (two lower arm decoys), and the chuck claws Q9a) Q911) are configured to be pushed apart.

A hose joint is attached to the chuck 2) so as to communicate with the passage t of the nut (4), and the nut (4) supplied through a hose (not shown) is connected to the nut holding hole. (7).

Place the above-mentioned nut tightener 1 in Fig. 5 1al (bl
(When the chuck (2) is placed at the predetermined position t as shown in cl, the nut (4)
) is supplied with the nut holding hole 1211#. Thereafter, when the box bit 13+ descends, it passes through the inner hole of the guide bin (61) +41 and further descends. When the box bit (3) comes into contact with the tapered hole +I11 of the guide claws (9a) (9b), the guide claws (9a) (9b) are pushed open. When the box bit (3) descends one step further, the support springs off. The chuck jaw (
19a) (Nano) 141C on (19'b) contacts and stops its descent. Therefore, the clutch (not shown)
works, and the box bit (3) rotates. Therefore, the hexagonal hole (51 of the box bit) 131 and the nut (41) are securely fitted, and the nut (4) is held in the index pit (3) and moves.In this state, the box bit; When it descends, the pock and spit (3) push the support spring (i-marked pressure force by 1) and push down the chuck jaws (19a) (19b) by t via the nut (41). Therefore, the sliding pro. The lower arm α of the chuck (2) moves downward along the guide shaft 01, and the chuck claw (
19aX19b), and the chuck claw (1
9a) Push open (19b). Therefore, 131 t is detached from the chuck claw Q9a) (19b) in a securely held state, and abuts on the desired stud in a normal state. The box bit; 3) is then rotated to ensure that the nut (4) is screwed into place.

As explained above, the present invention is configured such that the chuck jaws holding the nut are pushed open after the box pin nut is securely held, so that the nut can reach the desired stud position in its normal posture. There are advantages such as the fact that the studs are screwed into each other in close contact with each other, so that the studs do not tilt diagonally and bite, allowing for reliable fastening. Furthermore, the present invention is configured so that the chuck jaws are opened and closed only by the movement of the index pit after holding the chuck from the index pit, so there is no need for a drive device to forcibly open and close the chuck jaws. It has advantages such as being able to provide an inexpensive nano-tightening machine.

Furthermore, the present invention also provides a passage-robbing mechanism for a nut, a ripping pawl, a guide pawl, and a
Moreover, since the interval between the passages changes for each operation, there is no chance of the t-nuts getting jammed in the passages, which is an advantage.

[Brief explanation of the drawing]

Fig. 1 is a front view of the main parts of the present invention, Fig. 2 is a rear view of the main parts of the invention, Fig. 3 is a side view of the main parts of the invention, and Fig. 4 is A-A in Fig. 3. Sectional view along the line, Fig. 5 1al lb)
(01 is an explanatory diagram of the operation of the present invention, Fig. 6 1al tl)
1 is an explanatory diagram of the operation of a conventional nut tightening machine. Il+ Nut tightener, (2) Chuck, (
3) Box bit, (4; nut, (5)
Hexagonal hole, (6: Guide bin, (7)
(8) Steel ball, (9a) (
9b) Guide claw, cl spring, 1ull
Tapered hole, Q2 1st bottle passing hole, a) Guide groove, Round upper arm, f151 Lower arm,
tI61 Guide shaft, αη Sliding block, aa Support spring, (19aX19b) f
Y 9 Claw, ■Finger, ■Second bottle passing hole,
Hose joint, @ stud, ω retaining hole, Patent applicant: Nitto Seiko Co., Ltd. Figure 1? Figure 2 Figure 3 Figure 4 Figure 6 (α)

Claims (1)

[Claims] 1) Box bit +3 movably inside the chuck (2)
1, and this box bit (310sthtg) with a chuck claw (19a) (1
9b), and then place the claws (19a) (19b)
A nut tightening machine characterized in that a chuck (2) is movably attached to the chuck (2). 2) Inside the box bit (2)
31, and the chuck claw (19a) can be opened and closed freely so as to block the movement path of this box (19a) (131).
19'b) and this chi'ry claw (19a) (1
While the chuck (2) is movably attached to the chuck (2), the guide claws (9a) and (9b) are openable and closable so as to block the movement path of the box bit (3). A nut tightening machine characterized in that a passage for the nut is formed by the guide claws (9a, 9b), the guide claws (9a), (19b), and the guide claws (19a, 19b).