JPS593807Y2 - screw tightening machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a screw tightening machine, and more specifically, to the shape of a guide piece that guides a screw.

Conventionally, as shown in FIG. 1, the guide pieces of this type of screw tightening machine include a pair of guide pieces a, a, which are disposed facing each other so as to be openable and closable by a pin b, and are biased and held in the closing direction by a spring C.
A device is known in which when a screw e is pushed in by a driver d, it swings in the direction of opening.

However, with this structure, the pair of guide pieces a, a are simply held swinging in the closing direction by the spring C, so the screw guiding action by the pair of guide pieces a, a is uncertain and the spring force is uneven. Therefore, there is a problem that the screw e cannot advance straight and cannot be accurately tightened at a predetermined screw tightening position.

This is remarkable when the screw is moved horizontally.

The present invention was devised in view of the above circumstances, and its purpose is to provide a screw tightening machine that can advance screws straight.

Embodiments of the present invention will be described below with reference to FIG. 2 and subsequent figures.

The mounting body 1 is provided with a pair of lateral guide rods 2, 2, and a mounting frame 3 is provided at the other end.

First and second movable bodies 4 and 5 are slidably provided on the horizontal guide rods 2 and 2, and a feed screw rod 7 is screwed into the nut member 6 of the first movable body 4, and one end thereof is rotatably connected to the mounting body 1, and a bundle 8 is provided at the other end passing through the mounting frame 3.

A mounting base 9 is fixed to the second moving body 5, and the mounting base 9
is provided with a rotation motor 10 at the end of the air motor, and a rotary tool 11 such as a screwdriver is attached to the rotation shaft of the first moving body 4.
The cylinder 12 is fixedly installed toward the first movable body 4 and the second movable body 5.

A sliding rod 13 is fitted into the mounting base 9 so as to be slidable in the horizontal direction, and a mounting body 14 is fixed to the tip of the sliding rod 13 and is moved and held toward the tip by a spring 15. In addition, a housing 16 is fixed to the mounting body 14.

The housing 16 has a hole 17 through which the rotary tool 11 passes.
and a screw insertion hole 18 which is open and communicated with the longitudinal middle part of the hole 17, and a hose 19 connected to a screw feeder (not shown) is connected to the screw insertion hole 18. A screw collector 20 is attached to the tip of the hole 1.
It is installed in concentric communication with 7.

The screw collector 20 is attached to the tip protrusion 16 of the housing 16.
a, the holder 22 has a hole 21 that is fitted and fixed to the hole 17 and is continuous with the hole 17, and the holder 22 has a mounting groove 23.
are cut radially at 120° intervals, and each mounting groove 2
The leg portions 25 of the guide pieces 24 are inserted into the guide pieces 3 and supported rotatably in the radial direction by pins 26, and the guide portions 27 of each guide piece 24 have a fan-shaped cross section of 120° and an arcuate guide groove 28. A continuous groove 29 is cut into the outer peripheral surface of each guide piece 24, and an annular tightening spring 30 is attached across each groove 29, and each guide piece 24 is rotated inward to tighten it. said hole 2 by each guide groove 28.
1 and a tapered guide hole 31 is formed.

A stopper 32 is fixed to the first movable body 4 and faces the mounting body 14 .

Next, the operation will be explained.

The screw A is fed into the hole 17 from the hose 19 through the screw insertion hole 18, with the threaded portion A' protruding from the guide hole 31 and the head A// interfering with the small diameter portion of the guide hole 31.

On the other hand, the rotary tool 11 is rotationally driven by a rotation motor 10.

When the cylinder 12 is retracted in this state, the second moving body 5 is moved toward the first moving body 4, so the mounting body 14 and the rotary tool housing 16 are also moved in the same direction.

When the mounting body 14 comes into contact with the stopper 32, the mounting body 1
4. Since the housing 16 is stopped and only the rotary tool 11 moves, the rotary tool 11 is inserted into the hole 17 of the housing 16.
Hole 2 of the holder 22 is inserted into the guide hole 31 and engaged with the screw head A// to rotate the screw A.

When the rotary tool 11 moves further, the guide piece 24 is expanded outward by the screw head A, and the screw A protrudes from the guide hole 31 and is tightened and fixed at a predetermined screw tightening position.

At this time, since the guide portion 27 of the guide piece 24 has a substantially fan-shaped cross section of 120°, each guide piece 24 is spread out evenly and the center is always constant, so the screw A moves straight without bending. Therefore, the screws are tightened in the correct position.

This is the same even when screw A is advanced in the horizontal direction as shown in the figure.

Further, when the feed screw rod 7 is rotated by the handle 8, the first moving body 4 and the second moving body 5 move laterally along the lateral guide rod 2 as one body.

Therefore, since the entire screw tightening machine can be moved to correct the stroke of the rotary tool 11, it is possible to tighten screws even in far or near positions.

The present invention is as described above, and the guide portion 27 of the guide piece 24
has a fan-shaped cross section and has an arc-shaped guide groove 2 on its inner peripheral surface.
8, the guide grooves 28 of the three guide parts 27 form a substantially annular shape, and the guide hole 31 is continuous with (L21), so that it can be inserted into the guide hole 31 during screw tightening work. Even if the three guide pieces 24 are gradually opened and expanded by the screw A, the screw A is supported by the circular guide hole 31, and the screw A is always guided in a stable state and moves forward. Screw A can be advanced straight, and screw A can be accurately tightened at a predetermined screw tightening position.

In addition, an elastic annular tightening member 30 is provided over the outer circumferential surface of the three guide pieces 24 to tighten and hold each guide piece 24 toward the inner circumference. Since a strong tightening force is applied and screw A can be held straight at all times, screw A can be moved straight forward more reliably.

In addition, since three guide pieces 24 are provided at 120° intervals, the guide holes 31 are connected to the guide portions 27 at 120° intervals.
The screw A can be held without wobbling inside the screw, and the screw A can be advanced straight even more reliably.

In addition, the leg portion 25 of the guide piece 24 is attached to the mounting groove 2 of the holder 22.
3, so the legs 25 do not protrude outside and can be stored inside the holder 22.
Not only can the appearance be made excellent, but also the leg portions 25
does not interfere with other parts.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is a front view showing an embodiment of the present invention, Fig. 3 is a plan view of the III section thereof, Fig. 4 is a sectional view of the housing, and Fig. 5 is a perspective view of the viscometer. Figure, 6th
The figure is a front view, Figure 7 is a sectional view of VII-■11 in Figure 4,
FIG. 8 is a sectional view when it is expanded. 11 is a rotary tool, 16 is a housing, 17 is a hole, 24 is a guide piece, and 3] is a guide hole.

Claims (1)

[Scope of utility model registration request] A holder 22 (having L21) that is continuous with the hole 17 is fixed to the housing 16, which has a hole 17 into which the rotary tool 11 is inserted, and a screw insertion hole 18 into which the screw A is inserted, which is open in the middle of the hole 17. Three mounting grooves 23 are cut in the holder 22 at 120° intervals radially around the hole 21, and each mounting groove 23 has a guide piece 24 consisting of a leg part 25 and a guide part 27. The leg portions 25 are respectively supported on the holder 22 so as to be rotatable in the radial direction by means of pins 26, and the guide portions 27 of the guide pieces 24 have a fan-shaped cross section of 120° and a circular inner peripheral surface. The shape has an arcuate guide groove 28, and the three guide pieces 24
An annular tightening member 30 having elasticity is provided over the outer peripheral surface of the guide groove 2 of each guide portion 27 to tighten and hold it on the inner peripheral side.
A screw tightening machine characterized by forming a guide hole 31 which is substantially annular and continuous with the hole 21.