JPS5828470A - Clamping tool for part automatic 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 tightening of polygonal shapes such as plugs is related to the tightening tool of an automatic part fastening machine for fastening a part having an instep hole to a mating part.

For tightening polygonal parts such as hexagonal socket holes or hexagonal socket plugs, tightening of threaded parts with holes has been done using a tool.However, this tightening is done using a tool that has a similar shape to the hole. There is a bar-shaped hexagonal wrench key or bit that has a cross section. Tightening involves fitting a hexagonal rod-shaped bit into a working hole to achieve rotation, and tightening is performed by fitting a hexagonal rod-shaped bit into a working hole, but the smaller the fitting gap between the bit and the working hole, the better. has been done. On the other hand, if this gap is small, there is a problem that it is difficult to mate at the initial stage of mating, so a certain amount of gap is provided to facilitate mating, especially when tightening a large number of these screwed parts in succession. is normal. For this reason, problems such as the corners of the holes being deformed or missing, or the corners of the bits etc. wearing out quickly occur when tightening the holes.

Additionally, it will automatically tighten when working.

12. A gripper such as a jaw is provided around the bit to hold the screwed part, and the automatically supplied screwed part is gripped directly below the bit.12. The bit descends and engages the threaded part,
Generally, a method is used in which gripping tools such as jaws are pushed apart and tightened onto a mating part. In this case, the part is often screwed in at an angle with respect to the mating part at the initial stage of screwing.

This tendency is especially strong for short items. In addition, if the threaded part cannot be gripped by a gripper such as a jaw because of space constraints, the screwed part may fall out of the bit between the time it leaves the gripper and the time it reaches the mating part, making tightening difficult. There are problems such as making it impossible.

In order to solve this problem, the present invention aims to use a polygonal tightening tool such as a hexagonal hole port or a hexagonal hole plug so that the bit can be easily fitted into the hole and the bit can be securely retained during operation. This embodiment was invented for the purpose of this purpose and will be explained below based on the drawings.

FIG. 1 is a schematic diagram showing an embodiment of a machine for automatically tightening an automatically supplied screwed part (2) to a mating part (ω), and FIG. 2 is an enlarged sectional view of the main part of the rotating shaft of this machine.

To explain the general structure, a support part (6) that can be raised and lowered by a lifting means such as a cylinder along the pace @ is provided, a rotating shaft part is attached to this, and the tightening member of the present invention is attached to the lower end of the rotating shaft part. (17A) and working rod (18A) that make up the tool.
A) is installed.

For this tightening, the tool rotates together with the rotating shaft through a rotary power transmission mechanism such as a gear (1) by a drive motor attached to the support part (6), and tightens the screwed part to the mating part.
It is designed to be tightened. Furthermore, when the configuration of the rotating shaft section is explained in detail based on FIG. 2, (4) is as follows.
It is a rotating main shaft rotatably supported by a support part (6) via a bearing (5). This rotating main shaft (4) is attached to the support part (6) via a pinion (7) fixed to it by a key (2) or the like, and the rotary power transmission mechanism such as a gear (1) meshing with the binion (7). It is configured to be rotated by a drive motor (2). At the lower part of the rotating main shaft (4), a bit mounting shaft αl) is provided with a cushion stroke tS+ and is held by a nut 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 011, and the pin (9) that fits into this key groove is connected to the rotation main shaft (4).
) is fixed. A cylinder part @ is formed at the lower part of the axis of the bit mounting shaft aυ, and a piston [+31] screwed onto the operating rod (18A) is built into the cylinder part so as to be able to move up and down. This piston 03 is always urged upward by a spring I whose end is locked by a nut screwed onto the lower end of the bit mounting shaft Ql+.

A spring 112 is wound between the bolt a9 and the nut αl to constantly bias the bit mounting shaft Qll downward.

Said Natsu? There is a pin on the bottom end of +151) (17A)
has the working rod (18A) built in and is screwed onto it, and a locking nut (061) is fixed to this. A tapered tapered portion (2OA) is formed at the lower end of this action rod (18A).

As shown in Figures 2 and 3, the lower end fitting part of the pin F (17A) that can be fitted to the screwed part ■ has a similar shape to the hole for tightening the screwed part ■, and has dimensions that allow it to fit. At the same time, a plurality of sleeves (21A) of a predetermined length are formed to have elastic deformability in the radial direction. And the tapered part Q9A is tapered inside the lower end of the bit (17A).
) is formed, and the first working rod (18A') is configured to move by a predetermined amount to push and spread the tapered portion (I9A).

As a means for moving the operating rod (18A) by a predetermined distance, an air hose is provided at the upper end of the rotating main shaft (4) via a rotary joint, and this air hose τ is a means for supplying and discharging compressed air ( (not shown). The air hole (3) of the rotating main shaft (4) that leads to the air hose is connected to the air hole (3) through the relay pipe (8), and is passed through the air hole that runs through the bit mounting shaft (11) along the center line.
It communicates with the cylinder part. The upper part of the relay pipe (8) is press-fitted into the rotating main shaft (41), and the lower part is attached to the bit mounting shaft I.
A reciprocating shaft is inserted into the 11 air holes.

The tightening operation of the automatic fastening machine configured as described above will be described when a tool is used to tighten a screwed part to a mating part.

Use a screw-in parts holder (not shown), such as a jaw, provided around the automatic feeding big-and-place unit (or pick-up) (17A) to pick up the screw-in parts.
(17A) and the support part (6) of the automatic fastening machine.
At the same time as lowering the gear (
11 to rotate, and the rotating main shaft (4) is rotated via the pinion (7) that meshes with the pinion. This rotating main shaft (4)
The bit mounting shaft 11) receives a rotational force from the keyway portion by the pin +91 fixed to the bit mounting shaft fi11, and the pin (17A) and the action rod (18) screwed to the lower part of the bit mounting shaft fi11.
A). These continue to descend while rotating.

When the bit (17A) approaches the tightening hole of the screwed part (Fig. 4), the bit (17A) is inserted and fitted into the tightening hole. At this time, tighten the holes so that they match the corners of the holes.)
If the corners of (17A) do not match, temporarily use the bit (
17A) is prevented from descending, but since it is constantly urged downward by the spring α2, the pitch (17A) is pushed down the moment the corners meet, and the tightening is performed as a zero-order bolt that fits into the hole. Then, compressed air is supplied from the air hose ■ and the screw α3 screwed onto the action rod (18A) is pushed down, so the taper parts (19A) and (20A) engage and the bit (17A) is fitted. The parts are pushed apart and the screwed parts are securely fitted and held. (Fig. 5) When the fitting is completed, the P holder (not shown) automatically releases the screwed part (■) and moves back or clicks. (17A) is automatically pushed and expanded by descending.

Then, the support part (6) is lowered further and the screwed part is tightened to the mating part (2). (Figure 1! 6) When the predetermined tightening reaches a certain value, the drive motor ③ will stop and the tightening operation will be completed. Next, when the compressed air in the cylinder part @ is removed from the air hose field, the operating rod (18A) is pulled up by the spring I, and the fitting part of the bit (17A) is reduced to its original size, resulting in a clearance fit.

After this, the support part 16) is raised to the initial position and the tightening process completes one cycle.

Figure 7 and Figure tIg8 show other embodiments of the present invention.
Similarly to (17A), the screw-in part (■) has a shape and size that can be fitted into the hole, and is provided with multiple slits (21B) of a predetermined length to enable elastic deformation in the radial direction. There is. The taper parts 09B) and (20B) of the bit (17B) and the working rod (18B) are
) is formed with a tapered portion that is thicker at the tip, and is configured to push and expand the lower end fitting portion (17B) when the operating rod (18B) enters.

To explain the operation of this thing, the action rod (18E
) is always pushed downward by a spring (not shown), and when compressed air acts on a piston (not shown) screwed onto the action rod (18B), the action rod (18B) rises and tapers (19B), (20B) engages to push and spread the bit (17B) 0@9, 1st O
Figures 11 and 11 show another embodiment, in which the external shape of the lower end fitting part (17G) is the same as the screw part (17A) and (17B) of the previous embodiment. For tightening, the shape and dimensions are such that it can fit into the hole, and a plurality of slits (21) of a predetermined length are provided to enable elastic deformation in the radial direction.

This is the tapered part of the bit and working rod (19AX20AX19 (for the 20th, instead of this, the slit of (17C)) (21C"l
A slope ■ is formed on both sides of the lower part, and an action rod (18C)
A protrusion Ca11 is provided at the lower end, the protrusion C11l is engaged with the slope CIZ, and the downward movement of the action rod (18c) pushes the lower end fitting part apart. .

To explain the operation of this device, as in the case of the previous embodiment (FIG. 2), the action rod (18
When compressed air acts on the screw [713], the action rod (18G) descends and the protrusion On engages with the slope ■ and clicks. (17G) Push the lower end fitting part apart and screw in the part ■ to fit.

These tightenings explained on the basis of FIGS. 7 to 11 are the pins constituting the tool (17B).

(17G) and action rods Q8B) and (18G) are used in an automatic tightening machine, and the operation when tightening is completely the same as that described for the one using the above-mentioned pins (17A) and action rods (18A). It is a similar operation.

Furthermore, FIG. 12 shows a schematic diagram of the automatic tightening machine of the present invention equipped with a tool looking into the arm of an assembly robot to perform tightening work. Place a box, etc. (not shown) near the robot, fit the bit (17A) in the box to the part to be screwed, grip it, pick it up, and move it to the mating part (not shown) to be screwed. This shows an example in which screwing work is performed while moving.

As is clear from the embodiments described above, the tightening tool of the present invention has an operating rod installed inside a cylindrical bit so that it can freely reciprocate up and down by a predetermined amount in the axial direction, and is operated by a spring body. The bit is always biased upward or downward, the bit is elastically deformable in the radial direction, and at least either the bit or the working rod is provided with a retaining portion for both the tapered portion or the sloped portion and the protrusion; The fitting part of the bit is expanded or narrowed by relative movement of the bit and the working rod, and polygonal tightening such as a hexagon socket hole plug or a hexagon socket plug can be used in the hole. It is designed to fit a bit.

With the above configuration, a large fitting gap can be created at the initial stage of fitting, making insertion and fitting easy, and once the tightening work is completed, the fitting part of the bit returns to its original dimensions. Because it is smaller, it does not bite into the fitting hole and can be easily removed. In addition, the tightening is medium and the fitting part is firmly fitted 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 of just providing a slit, a tapered part or a sloped part, and is easy to process. Next, we will describe the features of each example.
In the tightening shown in Fig. 2, the tip of the working rod (18A) does not extend below the pin (17A), so it can be used for tightening screwed parts even when the hole is shallow. In addition, since the tip is tapered, the thickness of the tip of the tip (17A) can be increased, so that it can be strengthened. (17
The taper part (19) of B) can be easily machined from the outside.The one shown in Fig. 9 has a special hole shape for tightening screwed parts.

For example, it can be applied to a circular hole or an asymmetric hole.

As explained above, the tool of the present invention can perform tasks that are impossible with general tools such as wrenches or bits, for example, as explained with reference to FIG. Even when tightening a screwed part in a deep bottom, or when it is impossible to hold the screwed part directly above the mating part with a gripper due to space constraints, the tightening process can be performed with remarkable effects.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an automatic fastening machine in which a tightening tool of the present invention is attached to the lower end of the rotating shaft, and Fig. 2 is a schematic diagram of an automatic fastening machine in which the tightening tool of the present invention is attached to the rotating shaft of Fig. 1. Figure 3 is a bottom view of the tool for tightening in Figure 2, Figures 4 and 5 are tightening diagrams showing the process of fitting the tool into the screwed part, Figure 6 is the part Figures 7 to 11 show the state when the tightening of
The figure shows another embodiment of the tightening tool of the present invention.
Figure 8 shows a sectional view of the tool for tightening, Figure 8 is a bottom view of the tool shown in Figure 7, Figure 9 is a partial sectional view of the tool for tightening, Figure 1O is a bottom view of Figure 9, Figure 1 is a side view of FIG. 9, and FIG. 12 is an overall side view of the automatic tightening machine of the present invention equipped with a tool attached to a robot. (1) is a gear, (21 is a key. (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 the relay pipe, (9) is the bottle, Ql is the nut, α11 is the bit installation axis, az is the spring, and a3 is the piston %
I stands for spring, vessel stands for oak t, and αe stands for lock nut. (17AX17BX17C) is a bit, (18A)
(18 force (18G) is the action rod, (19AX19B)
(20AX20B) is the taper part, (21A) (21 pieces (21) is the slit, ■ is the cylinder part, is the air hole, is the base, is the cylinder. ■ is the drive motor, 211 is the air hose, (to) is Rotary join gauge, 1 is a screwed part, 2 is a mating part, GD is a protrusion, 2 is a slope, 3 is an arm. (SJ is a cushion stroke. Patent applicant Nitto Seiko Co., Ltd. Figure 12)

Claims (1)

[Claims] 1) A working rod that is reciprocally movable by a predetermined amount along the vertical axis direction is placed inside a cylindrical bit, and the outer shape of the lower end fitting portion of the bit is screwed into the part. For tightening, the bit is shaped so that it can fit 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. A tightening tool for an automatic parts fastening machine characterized by being configured to change the external dimensions of a joint. 2) The cylindrical bit has a tapered tapered portion inside the lower end fitting portion that can be held in a tapered tapered portion formed at the lower end of the working rod. The tightening of the parts automatic fastening machine described in section is a tool. 3) The cylindrical bit has a tapered part with a thickened end that can be engaged with a tapered part formed at the lower end of the working rod inside the lower end fitting part. The tightening of the parts automatic fastening machine described in paragraph 1 is a tool. 4) The cylindrical bit can be engaged with a protrusion protruding from the lower end of the working rod at the lower end of the plurality of slits and soots in the lower end fitting part, and the width of the slit gradually increases toward the tip. A tightening tool for an automatic parts fastening machine according to claim 1, characterized in that the tightening tool has an inclined surface that narrows at a lower angle.