JPS6017667B2 - Tightening tool for parts automatic fastening machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical attachment tool for an automatic parts fastening machine for vertically attaching parts having polygonal striped holes, such as hexagon socket head bolts or hexagon socket plugs, to mating parts. be.

A rod-shaped hexagonal tool with a similar cross-section to the vertical mounting hole has been widely used as a vertical mounting tool for screwed parts such as hexagon socket head bolts or hexagon socket plugs that have polygonal mounting holes. There is a spanner or bit.

In this method, a hexagonal bar-shaped bit is fitted in a vertical mounting hole to transmit rotation and perform vertical mounting work, and it is said that the smaller the gap between the bit and the vertical mounting hole, the better. On the other hand, if this gap is small, there is a problem that it is difficult to join them together in the early stages of joining.Especially when installing a large number of these screwed parts vertically in a row, it is necessary to provide a certain amount of clearance to facilitate joining. It is normal that This has caused problems such as the corners of vertical holes for bolts etc. being deformed or missing, and the corners of bits etc. wearing out quickly. Furthermore,
When automatically vertically attaching work, install a gripper such as a jaw that holds the screwed part around the bit, and grip the automatically supplied screwed part directly below the bit, and the bit will descend and hold the screwed part. In Europe and Europe, a method is generally adopted in which gripping tools such as jaws are pushed apart and attached vertically to the mating part.

In this case, the screw is often screwed in at an angle with respect to the mating part at the initial stage of screwing. I have a strong tendency to be short-sighted these days, especially when it comes to things. In addition, if the screwed part cannot be gripped due to the gripping odor due to the gripping odor due to the closeness of the mating part due to space constraints, the screwed part will fall out of the bit between the time it leaves the gripping odor and reaches the mating part, making vertical mounting work impossible. There are problems such as becoming. In order to solve these problems, the present invention provides a method for easily aligning a bit with a polygonal vertical mounting hole such as a hexagon socket head bolt or a hexagon socket plug, and for ensuring that the metal alignment is maintained during operation. This embodiment was invented for this purpose and will be explained below based on the drawings.

Figure 1 shows the automatically supplied screwed part 29 and the mating part 3.
FIG. 2 is a schematic diagram showing an embodiment of a machine for automatically vertically attaching a river, and FIG. 2 shows an enlarged cross-sectional view of a main part of the rotating shaft portion of this machine.

To explain the general structure, a cylinder 25 along a base 24
A support part 6 is provided which can be raised and lowered by a lifting means such as the above, and a rotating shaft part is attached to this support part 6, and a bit 17A and an action bar 18A which constitute the tying tool of the present invention are attached to the lower end of the rotating shaft part. .

This vertical mounting tool is rotated together with the rotating shaft section by a drive motor 26 attached to the support section 6 via a rotary power transmission mechanism such as a gear 1, and rotates the screwed part 29 to the mating part 30'.
It is designed to be vertically attached. Further, the configuration of the rotating shaft section will be described in detail based on FIG. 2. Reference numeral 4 denotes a rotating main shaft rotatably supported by a support section 6 via a bearing 5. The rotating main shaft 4 is rotated by a drive motor 26 attached to the support part 6 via a pinion 7 fixed to the main shaft by a key 2 or the like, and a drive motor 26 attached to the support part 6 via the rotary power transmission mechanism such as a gear 1 meshing with the pinion 7. It is the composition. A bit mounting shaft 11 is held at the lower part of the rotating main shaft 4 by a nut with a cushion stroke S so as to be slidable up and down by a certain amount. A key groove is formed on the upper outer periphery of the bit mounting shaft 11, and a pin 9 that is engaged with the key groove is fixed to the rotating main shaft 4. A cylinder portion 22 is formed at the lower part of the center of the bit mounting shaft 11.
A piston 13 screwed onto a working rod 18A is housed inside the piston 2 so as to be movable up and down. This piston 13 is always urged upward by a spring 14 whose one end is locked to a nut 15 screwed onto the lower end of the bit mount 11. Further, a spring 12 is wound between the nut 15 and the nut 10 to constantly bias the bit support shaft 11 downward. A bit 17A is attached to the lower end of the nut 15 in the action mode 18A.
A lock nut 16 is fixed to the built-in screw. A tapered tapered portion 20A is formed at the lower end of this working head 18A. A bit 17A that can be fitted to the screwed part 29 as shown in FIGS. 2 and 3.
The lower end mating part has a similar shape to the vertical mounting hole of the screwed part 29, has dimensions that allow joining, and has a plurality of slits 21A of a predetermined length formed therein to provide elastic deformability in the radial direction. .

A tapered part 19 is located inside the lower end of the bit 17A.
A is formed, and the working bar 18A is configured to push and spread the tapered portion 19A by moving by a predetermined amount. As a means for moving the action mode 18A by a predetermined distance, an air hose 27 is provided at the upper end of the rotating main shaft 4 via a rotary joint 28.
7 is connected to means (not shown) for supplying and discharging compressed air. The air hole 3 of the rotating main shaft 4 leading to the air hose 27 is connected with a relay pipe 8, and the bit mounting hole 1
1 through an air hole 23 extending along the center line and away from the cylinder portion 22. The upper part of the relay pipe 8 is press-fitted into the rotating main shaft 4, and the lower part is fitted into the air hole 2 of the bit mounting shaft 11.
3 is inserted so that it can be reciprocated. The operation when tightening the screwed component 29 to the mating component 30 using the cotton tightening tool of the automatic fastening machine configured as described above will be described.

The screwed part 29 is held in the bit 17 by a pick-and-place unit for automatic supply V supply or a screwed part gripping odor (not shown) such as a jaw provided around the bit 17A.
At the same time as the support part 6 of the automatic fastening machine is lowered, the drive motor 26 is driven to transmit rotation to the gear 1, and the rotation main shaft 4 is rotated via the pinion 7 that meshes with the gear 1.

The bit mounting shaft 11 receives rotational force in the key groove portion by the pin 9 fixed to the rotating main shaft 4.
1 and the working rod 18A. These continue to descend while rotating.
The bit 17A approaches the vertical mounting hole of the screwed component 29 (FIG. 4), and the bit ITA is inserted into the tightening hole and tapped.

At this time, if the corner of the vertical mounting hole and the corner of the bit 17A do not match, the bit 17A is temporarily prevented from descending, but since the spring 2 is constantly biasing downward, the corner is The moment they match, the bit 17A is pushed down and fitted into the tightening hole. Next, compressed air is supplied from the air hose 27 to the piston 13 screwed onto the operating rod 18A.
is pushed down, the tapered parts 19A and 20A engage, and the fitting part of the bit 17A is pushed out and the screwed part 2
9 is securely held. (FIG. 5) When the engagement is completed, the gripping tool (not shown) is configured to automatically release the screwed part 29 and move back, or to be automatically pushed out by lowering the bit 17A. Then, the support portion 6 is further lowered to secure the screwed part 29 to the mating part 30. (FIG. 6) When the predetermined vertical mounting torque is reached, the drive motor 26 is stopped and the vertical mounting operation is completed. Next, the compressed air in the cylinder section 22 is transferred to the air hose 27.
When the bit 17A is pulled out, the action member 18A is pulled up by the spring 14, and the iron part of the bit 17A is reduced to its original size to form a gap formation. After this, the support part 6 rises to the first stage of the technique and the tightening process completes one cycle. FIGS. 7 and 8 show other embodiments of the present invention, and the outer shape of the bottom of the bit 178 is a shape that can be fitted into the attachment hole of the screwed part 29, similar to the bit 17A of the above embodiment. A plurality of slits 21B having a predetermined length are provided to enable elastic deformation in the radial direction.

Bit 178 and taper portions 198 and 2 of working rod 18B
0B forms a tapered part with a thicker end opposite to that of the bit 17A, and when the working rod 18B enters, the bit ITB
The foundation was built to push through the lower section. To explain the operation of this device, the working shaft 18B is always pushed downward by a spring (not shown), and when compressed air acts on a piston (not shown) screwed onto the working shaft 18B, the working shaft 18B rises. Tapered part 19B
, 20B engage to push and spread the bit 17B.

FIGS. 9, 10, and 11 show another embodiment, and the outer shape of the lower end iron part of the bit 17C is similar to that of the bits 17A and 17B of the previous embodiment for tightening the screwed part 29. A plurality of slits 21C having a predetermined length and a shape and size that can be fitted into the holes are provided to enable elastic deformation in the radial direction.

Instead of the taper parts 19A, 20A, 19B, 208 of the bit and working rod of the two embodiments, slopes 32 are formed on both sides of the lower part of the slit 21C of the bit 17C, and the working rod is A protrusion 31 is provided at the lower end of 18C, and this protrusion 31 is engaged with the slope 32, so that the lower end of the bit ITC is pushed through by the downward movement of the action member 18C. To explain the operation of this device, similarly to that described in the previous embodiment (FIG. 2), the actuated member 18C is always urged upward by the spring 14, and the piston 1 screwed onto the actuator 18C.
When compressed air acts on the bit 17C, the action bar 18C descends, and the protrusion 31 engages with the slope 32, pushing the lower end of the bit 17C to expand and engage the screwed part 29.

When the bits 17B, 17C and the working rods 16B, 18C constituting the tying tool explained based on FIGS. 7 to 11 are used in an automatic fastening machine, the operation when tightening is as follows: The operation is exactly the same as that described for the one using the action rod 18A.

Furthermore, FIG. 12 shows a schematic diagram of the basis for attaching the automatic fastening machine equipped with the vertical attachment tool of the present invention to the arm 33 of an assembly robot to perform vertical attachment work. etc. (not shown) near the robot, and in the box, hold the bit 17A by ironing it to the screwed part 29, pick it up, and place it in the screwed mating part (
This shows an example in which the screw is moved to a location (not shown) and screwed in.

As is clear from the embodiments described above, the vertically mounted tool of the present invention has an operating rod provided inside a cylindrical bit so as to be able to reciprocate up and down by a predetermined amount in the axial direction, and also has a spring body that allows it to be moved upwardly or The bit is always urged downward, the bit is made to have elastic deformability in the radial direction, and at least one of the bit or the working rod is provided with an engaging part of both a tapered part or an inclined part and a protrusion, and the bit and The bit is constructed so that the iron joint part of the bit is enlarged or narrowed by the relative movement of the working rods, and the bit is fitted into a polygonal vertical mounting hole such as a hexagon socket head bolt or hexagon socket plug. This is what I did.

With the above configuration, a large competition gap can be created at the initial stage of joining, making insertion and joining easier, and once the tightening work is completed, the lateral joining part of the bit will shrink back to its original dimensions, making it possible to It can be easily removed without getting stuck in the matching hole.

In addition, during competition, the drum parts are tightly fitted together without any gaps, so there is no damage to the screwed parts and there is little wear on the bit. The bit has a simple structure with a slit and a tapered portion or sloped portion, making it easy to process. Next, the features of each embodiment are described as “Second
In the tacking tool shown in the figure, the tip of the working hole 18A is bit 1.
Since it does not protrude below 7A, it can be used even with shallow vertical mounting holes for screwed parts. Further, since the bit 17A has a tapered shape, the thickness of the tip of the bit 17A can be increased, thereby providing strength. Since the bit shown in FIG. 7 has a tapered tip with a thicker tip, the tapered portion 98 of the bit 178 can be easily machined from the outside. The one shown in Figure 9 has a special shaped vertical mounting hole for screwed parts.
For example, it can also be applied to oval or asymmetrical holes. As explained above, the tool of the present invention can perform tasks that are impossible with general tools such as wrenches or bits, such as "grasping a threaded part at the tip of the bit, transporting it, and attaching it vertically," as explained with reference to FIG. Other work in which a screwed part is attached vertically to the bottom of a deep hole.Also, even in cases where it is impossible to hold a screwed part directly above the mating part due to space constraints, it is possible to perform tightening work, and other remarkable effects can be obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an automatic fastening machine in which the vertical attachment tool of the present invention is attached to the lower end of the rotating shaft, and Fig. 2 is a view of the rotating shaft shown in Fig. 1 with the attachment tool of the present invention attached. 3 is a bottom view of the vertical mounting tool in Figure 2, and Figures 4 and 5 are diagrams showing the process of fitting the vertical mounting tool to the screwed part. Figure 6 shows the vertical mounting of the part. Figures at the time of completion ~ Figures 7 to 11
The figure shows another embodiment of the vertical mounting tool of the present invention.
The figure is a sectional view of the tightening tool, Figure 8 is the bottom view of Figure 7, Figure 9 is a partial sectional view of the total installation tool, Figure IQ is the bottom view of Figure 9, and Figure 11 is the bottom view of Figure 9. FIG. 12 is an overall side view of the automatic fastening machine equipped with the vertically installed tool of the present invention attached to a robot. 1 is the gear, 2 is the key L, 3 is the air hole, 4 is the rotating main shaft, 5 is the bearing, 6 is the support part, 7 is the pinion, 8
is a relay pipe, 9 is a pin, 10' is a nut, 11' is a shaft with a bit attached, 12 is a spring, 13 is a piston spring, 1
5 is a nut, 16 is a lock nut, and 7A? 178,I
TC is pit, turtle 8Ao188918C is action rod, 19
A, Turtle 9B, 20A mother 208' Taper part, 21'
21B, 21C are slits, 22 is a cylinder part, 23 is an air hole, 24 is a base ~ 25 is a cylinder, 26 is a commotion motor ~ 27 is an air hose, 28 is a rotary joint, 29 is a screwed part, 3 parts are mating parts, 31 is the projection t 32 is the slope ~ 33 is the arm LS S is the cushion stroke. Figure 1 Figure 4 Figure 5 Figure 6 Figure 2 Figure 3 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12

Claims (1)

[Scope of Claims] 1. A working rod is installed inside a cylindrical bit to be able to reciprocate by a predetermined amount along the vertical axis direction, and the external shape of the lower end fitting portion of the bit is screwed to tighten the parts. The bit has a shape that can be fitted into the hole, and the bit is provided with a plurality of slits of a predetermined length to provide elastic deformability in the radial direction, and the external shape of the fitting part of the bit is changed by relative movement between the bit and the working rod. A tightening tool for an automatic parts fastening machine, characterized by being configured to change dimensions. 2. Claim 1, characterized in that the cylindrical bit has a tapered part on the inside of the lower end fitting part that can be engaged with a tapered part formed at the lower end of the operating rod. Tightening tool for the parts automatic fastening machine listed. 3. The cylindrical bit has a tapered part on the side of the lower end fitting part with a thicker end that can be engaged with a tapered part with a thicker end formed at the lower end of the operating rod. A tightening tool for the automatic parts fastening machine described in item 1. 4. The cylindrical bit can be engaged with the protrusion protruding from the lower end of the operating rod at the lower end of the plurality of slits in the lower end fitting part, and the width of the slit is an inclined surface that gradually narrows toward the tip. Claim 1 characterized in that it has
Tightening tool for automatic parts fastening machine described in section.