JPH02298471A - Automatic driver device - Google Patents

Abstract

PURPOSE:To hold surely and stably without causing hanging and inversion even in case of various lengths under the neck of a screw by making a screw guide hole and the screw interposing part of a jaw coaxial and in an approached positional relation and forming the screw interposing part of the jaw in a conical shape. CONSTITUTION:When a screw A is fed by a compressed air from a hose A, it is fitted into a conical hole by passing through a screw guide hole 32 from a hose connection pipe 4 and locked on a conical hole face with a head part. In this case, a stabilized screw feeding can be done without its moving by the movement of the device main body and the flow of the compressed air because of the hose connection pipe 4 being inserted and fixed to a nose 3. And yet a conical hole 61 is located on a straight line with the screw guide hole 32 and the mutual positions are approached much, and so the screw A is dropped smoothly into the conical hole 61 with its axial part first without being hung on the way together with the guide action by the conical hole 61 and interposed from the right and left. In this case, the under-neck of the screw A is projected to the free space at the lower face side of the jaw 6.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an automatic driver device.

[Conventional technology and its technical issues]

As a labor-saving means for tightening screws, there is an automatic driver device as disclosed in Japanese Utility Model Publication No. 60-12707, for example.

In this prior art, a pair of jaws for opening and closing the axial front of the guide hole are pivotally mounted on both sides of a nose in which a guide hole for guiding the driver to the driver pit 1 is vertically provided. As a screw supply mechanism, a hose connection fitting is fixed to the nose in an inclined manner, and a screw guide tube is connected to the hose connection fitting via a spherical seat so as to be tiltable, and the screw guide tube is connected to the lower end of the guide hole of the nose. They were placed in a cross-like position so that when the pin I was lowered, the guide tubes were swung in a direction approaching the vertical direction.

However, in this prior art, the screw holding portion of the jaw and the screw guide tube are not provided on the same axis, and are composed of a combination of an inclined portion and a vertical portion.

In other words, the screw descended diagonally through the hose connection fitting and the screw guide tube, fell through the opening of the screw guide tube into the vertical screw holder, and was held with the lower neck (shaft) first. .

Therefore, with this prior art, it is not possible to respond well to changes in the length of the screw under the neck, and when the length of the screw under the head is long, the screw gets caught in the jaw, and when the length under the head is short, the screw falls over in the jaw. There was a problem that could easily occur. In order to avoid this, the shape and dimensions of the jaw must be optimally manufactured depending on the length under the neck, and the screw holding part of the jaw has a fairly long tubular cross section, so even if the shape and dimensions are appropriate, the surface roughness may occur. If it is rough, the screw will easily get caught in the middle, so
There was a problem with this method, which required a high degree of accuracy and was extremely time-consuming and costly.

The present invention was devised to solve the above-mentioned problems, and its purpose is to provide an automatic screwdriver with a relatively simple structure that can always tighten screws stably regardless of the length of the screw head. The goal is to provide equipment.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a nose in which a guide hole for a suction pipe into which a driver hit is slidably and rotatably inserted is provided vertically, and a screw guide hole is provided obliquely at a position displaced from the guide hole; A base plate that is placed at the bottom of the base plate and can swing freely around a horizontal axis attached to the nose, a pair of jaws that can be opened and closed around a vertical axis that is placed on the second part of the base plate and fixed to the base plate 1, and The configuration includes a spring that biases the base plate so that the formed conical split hole is normally located coaxially with the screw guide hole of the nose.

[For production]

The screw is fed by compressed air through the hose and into the screw guide hole. At this time, the base plate and the jaws are tilted about the horizontal axis by the spring, and the conical hole formed by the pair of jaws is aligned coaxially with the screw guide hole -L and is located in the closest position. Therefore, the screw passes through the screw guide hole and is directly inserted into the conical split hole.

Since the lower side of the jaw is a free space, it can be held in an appropriate state without any problems, regardless of whether the length under the neck is long or short.

Next, when the suction pipe descends, the jaw and base plate are pushed down against the spring force, and the suction pipe and the split hole are coaxially aligned. In this state, the screw is suctioned by the negative pressure applied to the suction pipe, and is engaged with the lever bits 1 to 1. When the Triba Pit 1~ is lowered, the jaws open left and right around the vertical axis, and the screw is screwed into the workpiece.

When screwing is completed and the suction pipe returns to its original position, the jaws close, and the spring force returns the jaws and base plate to the tilted position described above.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 4 show an embodiment of an automatic driver device according to the present invention. 1 is a driver bit driven by a rotational drive source (not shown), 2 is a suction pipe for suctioning and holding screws, and the rear end side is connected to a vacuum generator (not shown) that generates negative pressure. ing. The driver bit 1 is inserted into the suction pipe 2 with an appropriate clearance.

Reference numeral 3 denotes a nose having a vertical guide hole 30 for guiding the suction pipe 2 in a reciprocating manner.

This nose 3 has a block part 3a extending downward at the back, and this block part 3a is a rectangular frame part 3b expanded in the width direction as shown in FIG. An inclined surface 31 is formed.

A screw guide hole 32 is bored in the block portion 3a at an angle perpendicular to the inclined surface 31. This screw guide hole 32
It consists of a stepped hole, and a hose connection pipe 4 is inserted and fixed in the hole on the enlarged side.

A hose H is connected to the hose connection pipe 4, and compressed air is fed through the screw A as a carrier.

5 is a base plate, and the rectangular frame portion 3 of the nose 3
It is arranged so as to penetrate through b, and is able to swing freely around the horizontal axis. Specifically, as shown in FIG. 4, the base plate 5 has parallel parts 5a, 5a and parallel parts 5a, 5a.
and a connecting portion 5b that connects them together. parallel part 5a,
A concentric through hole is drilled at a position biased toward the longitudinal direction of 5a, and a horizontal shaft 7 is fitted into this through hole, and is rotationally integrated with the parallel parts 5a, 5a by a set screw 71. .

Both ends of the horizontal shaft 7 are rotatably supported by bearings 70 on both side frame portions of the rectangular frame portion 3b.

Then, as shown in Fig. 1 and Fig. 4, the parallel part 5a + 5a
A coil spring 9 is mounted around the horizontal axis 7 between the ends of the coil spring 9 and the hole 50 of the connecting part 5b and the rectangular frame part 3b.
The base plate 5 is biased in two directions.

A pair of jaws 6.6 are arranged so as to penetrate the rectangular frame portion 3b, and are attached to the base plate 5 so as to be able to swing freely together with the base plate 5 and to be able to open and close independently. To explain in detail, Joe 6.6 is
It is made into a scissor shape with a length such that the pressure receiving surface is on the plumb side of the suction pipe 2 in the tilted state shown in FIG. It is located. Then, on the opposing surfaces, a conical split hole with a downward concave shape is formed in a region forward of the connecting portion 5b to form a conical hole for holding a screw coaxially with the screw guide hole 32 in the state shown in FIG. 60,01 is formed. The conical split holes 60, 60 are configured such that the maximum hole diameter is larger than the diameter of the suction pipe 2.

In the parallel parts of the base plate corresponding to both sides of the conical split hole 60.60, base parts 52, 52 are bored, which are in constant contact with the lower surface of the jaw 6.6.
A screw hole 53.degree. 53 is provided in the parallel portion rearward of this point, as shown representatively on one side in FIG. The jaw 6.6 has a bearing 11.11 concentrically with the screw hole 53.
is fitted into the bearing 11.11, and the flanged vertical shafts 8, 8 are inserted through the inner ring side of the bearing 11.11, and the tips of the vertical shafts 8, 8 are screwed into the tapped holes 53.53. The jaw 6.6 is rotatable about a vertical axis 8. Then, in order to bias the jaw 6.6 to the closed state,
A tension spring 10 is interposed between the rear ends of the jaws.

[Effect of the embodiment]

The device of the present invention is used with the nose 3 attached to the arm of a robot. When the suction pipe 2 is retracted, the base plate 1 5 is tilted about the horizontal axis 7 by the spring force of the coil spring 9, so that the jaw 6
．． 6 also tilts together, and its upper surface abuts the inclined surface 3]- of the nose 3. Since the tension spring 10 is acting on the jaws 6.6, the opposing surfaces are in close contact with each other, and a conical hole 61 is formed by the conical split holes 60, 60. The conical hole 61 is located coaxially with the screw guide hole 32 as shown in FIG.

In this state, when the screw A is fed by compressed air from the hose H, the screw A is inserted into the conical hole from the hose connection pipe 4 through the screw guide hole 32, and is locked with the head in the conical hole. In this case, since the hose connection pipe 4 is inserted and fixed to the nose 3, it does not move due to the flow of compressed air or movement of the main body of the apparatus, and stable screw supply can be performed. Moreover, since the conical hole 61 is in a straight line with the screw guide hole 32 and the positions are very close to each other, the screw A
The shaft part falls smoothly into the conical hole 6'' without getting caught in the guide action of the conical hole 61, and is gripped from the left and right sides. Furthermore, since the conical hole 61 is coaxial with the screw guide hole 32 and the lower side, that is, the lower surface side of the jaw 6.6, is a fleece base, even if the lower neck of the screw A is long, the lower neck part can be used in the free space. It is held in such a way that it sticks out, so it doesn't get caught in the middle.

When the suction pipe 2 descends in the state shown in FIG. 1, the tip 20 of the suction pipe 2 hits the upper surface of the free end side of the jaw 6.6.
Since the pressing force from the suction pipe 2 is transmitted to the base plate 5 via the base portion 52.52, the jaw 6.6 and the base plate 5 are moved around the horizontal axis 7 so that the bottom surface of the base plate 5 is aligned with the rectangular frame portion 3b. Rotate until it hits the seat frame. The abutment position of the suction pipe 2 is shifted closer to the conical hole according to the movement trajectory of the jaw 6.6, and when the jaw 6.6 becomes horizontal, the suction pipe 2 is coaxial with the conical hole 61. , and the tip 20 is in close contact with the conical wall.

Then, when a negative pressure is applied to the suction pipe 2 by a vacuum device (not shown), the screw A held in the conical portion is sucked upward. Since the driver bit 1 is located concentrically within the suction pipe 2, the driver groove of the screw head automatically meshes with the driver bit 1. This is the situation shown in FIG.

When the suction pipe 2 further descends from this state, the jaws 6.6 are expanded laterally about the vertical axes 8, 8 as shown by imaginary lines in FIG. As a result, the suction pipe 2 passes through the space between the parallel parts 5a, 5a of the base brakes 1 to 5 while being guided by the forcibly opened conical split holes 60.degree. 60, and reaches the surface of the workpiece. By driving the driver bit 1 in this state, the screw A is tightened into the workpiece.

When the tightening work is completed, the suction pipe 2 and driver bit 1 return to their original positions. During this process, the tension spring 10 works to close the jaws 6.6, and the coil spring 9 is restored, so that the base plate 5 and the jaws 6.6 are pushed up and return to the state shown in FIG. 1 again.

〔Effect of the invention〕

According to the automatic driver device of the present invention described above, the screw guide hole and the screw holding part of the jaw are coaxial and in a close positional relationship when supplying screws, and the screw holding part of the jaw has a conical shape. Therefore, even if the length of the screw under the neck varies, it can be held securely and stably without getting caught or falling over, and sometimes tightening is done by the downward force of the suction pipe that causes the suction pipe and screw to tighten. The jaws are moved so that they are coaxial, and then are expanded left and right, making it possible to stably tighten the screw.

In addition, one shape of the jaw is sufficient regardless of the length of the underhead of the screw, and the screw does not get caught even if the surface is rough, so manufacturing is easy and inexpensive.

[Brief explanation of drawings]

FIG. 1 is a vertical side view showing an embodiment of the automatic driver device according to the present invention, FIG. 2 is a vertical side view showing the suction pipe in a lowered state, FIG. 3 is a front view thereof, and FIG.
The figure is a partially cutaway sectional view taken along the line ■-■ in FIG. 2. 1...Dry pit 1-12...Adsorption pipe, 3.
Nose, 4... Hose connection pipe, 5 Base plate, 6, 6... Shimmy, 7... Horizontal axis, 8 Vertical axis,
9...Coil spring, 10...Tension spring, 30...
Guide hole, 32...screw guide hole. Patent applicant: Agent of Diesel Kiki Co., Ltd.
Patent attorney Kuro 1) Hiroshi Yasushi Figure 1 Figure 2 GupaN... \

Claims (1)

[Claims] A nose has a vertical guide hole for a suction pipe into which a driver bit is slidably and rotatably inserted, and a screw guide hole is installed obliquely at a position displaced from the guide hole, and a horizontal screw guide hole is arranged at the bottom of the nose and attached to the nose. A base plate that can swing freely around a shaft, a pair of jaws placed on the base plate that can be opened and closed around a vertical shaft that is fixed to the base plate, and a conical split hole formed in the jaws that normally guides the nose screw. An automatic driver device comprising: a spring that urges the base plate to be positioned coaxially with the hole.