JPH05138454A - Method and device for supplying and fastening bolt and nut or the like - Google Patents

Abstract

PURPOSE:To prevent the dislocation of the relative positional relation of a bolt and a nut with a rotary supply rod by fitting a head of a bolt and a nut in a fitting hole of a rotary supply rod, and unifying these parts with the supply rod. CONSTITUTION:Parts such as a bolt and nut 1 or the like are held by a turning arm 24 to be operated by a turning motor 21, and when the turning arm 24 is turned to a predetermined position, the parts are stopped on the axial line of a supply rod 4, and thereafter, the parts are fitted in a fitting hole 5 of the supply rod 4, and the supply rod 4 goes forward for fastening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to supplying and tightening parts such as bolts and nuts, and is intended to automate a commonly used bolt runner or nut runner as an automatic machine. ..

[0002]

2. Description of the Related Art The conventional technique is based on projection welding and is therefore completely different from the target technique.
There is a 6590 gazette "a component supply device such as a welding bolt". In this publication, a case of a projection welding machine, a rotating arm is attached to a rotating shaft that moves up and down,
An open-close type chuck is installed at the tip of the chuck, and when the chuck holds a component, the rotating shaft rotates to move the component on the axis between the upper and lower electrodes, and then the upper electrode descends to move the component. When is pressed down, both the chuck and the rotary shaft are also pressed down, and the component is moved to the vicinity of the counterpart component on the fixed electrode, and the stopper of the rotary shaft hits the stationary member at that location to forcibly stop the lowering of the chuck. When the upper electrode further descends there, the chuck is pushed open by the descending of the component, the component is brought into contact with the counterpart component, and electricity is supplied to complete the welding.

[0003]

However, with the above-mentioned technique, unless the relative positional relationship between the upper electrode and the chuck during the lowering is normally maintained, the smooth lowering of the rotating shaft is hindered. May occur, or the chuck may open slightly while descending, which may result in inaccurate component holding.
Such a phenomenon has a problem that the above-mentioned "relative positional relationship" must be maintained throughout the descent.

[0004]

Means for Solving the Problem and Its Action The present invention was devised to solve the above-mentioned problems, and the invention of claim 1 uses a bolt or nut near the tip of the rotating arm. Hold and stop the bolts or nuts on the axis of the advancing / retracting supply rod by turning the rotating arm.
After that, after inserting a bolt or a nut etc. into the engaging hole of the supply rod, the rotary arm is retracted to the original position, and then the supply rod advances to bring the part to the target position for tightening. It is a method of tightening the supply of bolts or nuts, etc., and operates in the order as described here.

According to the second aspect of the invention, the advance of the supply rod is 2
This is a stepped stroke, and parts are fitted into the supply rod in the first stage, and the parts are made to reach the target location in the second stage for tightening. According to a third aspect of the present invention, in the first aspect, at least the rotating arm and the rotating motor thereof retreat independently of the supply rod, and the retreat causes only the supply rod to reach the target position in a protruding state. , Tighten.

According to a fourth aspect of the present invention, a component holding portion is formed in the vicinity of the tip of a rotary arm driven by a rotary motor, and the rotary arm is rotated so that it is rotated and moved back and forth on the axis of a supply rod. Supply of bolts or nuts, etc., characterized in that the installation position of the supply rod is determined so as to stop the component, and the component is fitted into the engagement hole of the supply rod by the movement of the rotating arm or the supply rod. It is a tightening device, and has the action as in claim 1.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First of all, referring to the embodiments shown in FIGS. 1 and 2, the object parts here are bolts 1, reference numeral 2 is a hexagonal head, and 3 is a shaft. Shows. The rotation advancing / retracting type supply rod 4 has an engagement hole 5 that receives the head 2 at the tip thereof and is opened downward.
It is better to use a dodecagonal type or an 18-sided type rather than a hexagonal type in terms of smooth engagement. A magnet (permanent magnet) 6 is embedded in the inner portion of the engagement hole 5 to prevent the head 2 from falling out of the engagement hole 5 due to the attracting magnetic force.

The supply rod 4 is connected to a rotary motor 7 driven by compressed air, electric current (air hoses, electric wires, etc. are not shown), and a slide piece 8 fixed to the motor 7. Moves back and forth along the guide rail 9. As is clear from FIG. 9, a dovetail groove 10 is formed in the guide rail 9, and the slide piece 8 is fitted therein. The guide rail 9 is welded to the fixed piece 12 attached to the stationary member 11, and is arranged along the advancing / retreating direction of the supply rod 4. An air cylinder 13 is attached to the fixed piece 12, and its piston rod 14 is connected to the rotary motor 7.

A guide cylinder 16 is fixed to the stationary member 11 via a bracket 15, and the supply rod 4 penetrates the interior of the guide cylinder 16 in a proper state. The supply rod 4 can rotate and move back and forth in the guide cylinder 16. It is in a state.
A component supply pipe 18 having a component supply passage 17 has a stationary member 1.
1, which is firmly fixed via a bracket 19 to which a supply hose 20 is connected, which hose extends from a parts feeder (not shown). The air-driven or electrically-driven rotation motor 21 is also fixed to the stationary member 11 via the bracket 22, the rotation arm 24 is connected to the output shaft 23 of the rotation member 21, and the component holding portion 25 is formed near the tip thereof. There are various methods for realizing the component holding portion 25, but here, it is configured by a groove 26 that receives the bolt 1, and a wide portion 27 that receives the head portion 2 and a narrow portion 28 that receives the shaft portion 3 are provided. When the rotating arm 24 that is included is in the return position, the component holding portion 25 causes the component supply pipe 18 to move.
The positional relationship is such that the bolt 1 that is located directly below the component supply pipe 18 can smoothly enter the groove 26. An L-shaped bracket 29 is welded to the tip of the rotating arm 24, and a closing member 32 is attached to a piston rod 31 of an air cylinder 30 fixed thereto.
When the air cylinder 30 moves forward and backward, the narrow portion 2 of the groove 26 is moved.
8 is closed or released. A magnet (permanent magnet) is embedded in the closing member 32 to position the bolt 1 that has entered.

When the rotating arm 24 rotates by a predetermined angle in the direction of the arrow 34 and stops, the relative position between the output shaft 23 and the supply rod 4 is adjusted so that the bolt 1 is located on the axis of the supply rod 4. It is set. The state indicated by the chain double-dashed line in FIG. 1 indicates this axis line coincidence.

The operation sequence of this embodiment will be described. When the bolt 1 is supplied to the place where the closing member 32 closes the narrow portion 28, the bolt 1 is provided with the groove 2 as shown in FIG.
It is accepted within 6 and stops. Next, the rotating arm 24
When the bolt 1 rotates a predetermined angle and stops on the axis of the supply rod 4, the supply rod 4 rotates and makes a very slight first-stage advancing stroke by the air cylinder 13, so that the head 2 of the bolt is engaged. The magnet 6 is fitted in the fitting hole 5 and is held by the magnet 6. After that, after the closing member 32 retracts, the rotating arm 24 retreats toward the original position, the supply rod 4 makes a second-stage stroke, and the bolt 1 becomes a screw hole (not shown) at a target position. It is made to reach and is screwed in there. When this is completed, the supply rod 4 returns to the position shown in FIG. 1 to prepare for the next stroke.

Since the bolt 1 must not rotate together during the transitional period when the head 2 is fitted into the engagement hole 5 of the supply rod, it is desirable to apply a braking force to the bolt 1 in the component holding portion 25. The configuration adopted for that purpose is that shown in FIG. 3, and here, the type in which the pressing pin 35 is butted against the shaft portion 3 is illustrated. The pressing pin 35 includes a small diameter portion 36 and a large diameter portion 37, and is accommodated in the guide hole 38. The tension of the coil spring 39 acts on the large diameter portion 37, and the force is received by the cam piece 40. This cam piece 40 is housed in a cam guide hole 41 opened in the rotating arm 24, and a piston rod 43 of an air cylinder 42 fixed to the side surface of the rotating arm 24 is connected to the cam piece 40. When the cam piece 40 is pushed up by the air cylinder 42, the pressing pin 35 applies a braking force to the shaft portion 3. When the bolt 1 is integrated with the rotating supply rod 4, the bolt 1 is pressed by the pressing pin 35. Overcome the braking force of 35 and rotate together.

FIG. 4 shows another example of the component holder 25, which is of a so-called chuck type. Rotating arm 2
4 is welded to the side surface of the base plate 4 and the pair of jaws 4 is attached thereto.
5, 46 mounted by pivots 47, 48 to the jaws 4
The shaft portion 3 of the bolt is grasped between 7 and 48. A coil spring 49 is arranged between the rear portions of the jaws 47 and 48 so as to apply a braking force to the shaft portion 3 and sandwich it.

Next, referring to FIG. 5 and FIG. 6, the flange 5
To explain the case of the nut 51 having 0, the component supply pipe 52 is installed in a substantially horizontal direction, and the nut 51 is transferred to the rotating arm 24 standing by in the immediate vicinity of the pipe 52. A stepped portion 53 for receiving the flange 50 is formed on the upper surface of the rotating arm 24, and the circular flange 5 is formed.
A circular arc portion 54 is provided to achieve zero positioning.
A magnet (permanent magnet) 55 is embedded in the step portion 53. Since the operation of this embodiment can be easily understood from that of FIGS. 1 and 2, detailed description is omitted.

Next, the embodiment shown in FIGS. 7, 8 and 9 will be described.
By retracting the rotation motor 21 and the rotation motor 21 independently of the supply rod 4, the head of the bolt (not shown here) is fitted into the engagement hole 5 and the rotation arm 24 is operated by the above-described operation. After the evacuation of the supply rod 4, the supply rod 4 is advanced. The same members as those in the previous embodiment are designated by the same reference numerals and detailed description thereof is omitted. Guide tube 1
6 is not fixed to a stationary member as in the previous case, but can be moved back and forth along the supply rod 4. An air cylinder 57 is attached to the rotary motor 7 via a bracket 56, and a piston rod 58 of the air cylinder 57 is attached to the bracket 15.
Is bound to. The bracket 19 is longer than the previous one, and one end thereof is welded to the guide cylinder 16. Rotation motor 2
No. 1 is also not fixed to the stationary member, but the bracket 22 is welded to the guide cylinder 16.

The operation of this embodiment will be described. A bolt (not shown) is held in the component holder 25,
When the rotating arm 24 rotates and the bolt becomes coaxial with the supply rod 4, the head of the bolt is fitted into the engagement hole 5 by the very slight upward stroke of the air cylinder 57 in the first step. Next, after the closing member 32 retracts, the rotation arm 2
4 withdraws, the air cylinder 57 performs the second-stage upward stroke, and only the supply rod 4 projects from the guide cylinder 16. In this state, the air cylinder 13 is actuated to move the bolt to the desired position. Is reached and tightened there. When the air cylinder 13 operates, the guide cylinder 16, the rotation motor 21, the rotation arm 24, the component supply pipe 18, and the air cylinder 57 and the like move forward integrally with the supply rod 4 without changing their relative positions. When the tightening of the bolt is completed, the air cylinder 13 makes a contracting stroke and the air cylinder 57 makes an advancing stroke, and as shown in FIG.

Although the component supply pipe 18 is connected to the guide cylinder 16 in this embodiment, the component supply pipe 18 may be stopped and the component supply pipe 18 may be attached to the stationary member 11. That is, at least the rotating arm and the rotating motor can be retracted independently of the supply rod. Also in FIG. 7, means for applying the braking force as shown in FIG. 3 may be installed.

In each of the embodiments described above, a rotary motor whose output shaft rotates is shown. However, as another method, the pivot shaft is fixed to the rotary arm and the arm is attached thereto. An air cylinder may be connected to the arm. Further, the control device for obtaining the operation sequence as in each embodiment can be easily implemented by a combination of a conventionally used electromagnetic air control valve and a control circuit. Also, the supply hose is flexible and has a margin in length so that it can be bent during operation.

[0019]

According to the present invention, the bolt or nut held by the rotating arm is held in the engaging hole of the supply rod, and the supply rod advances while holding the part to perform tightening. The relative position between the feed rod and the feed rod does not change at all, and the position of the parts does not shift when the feed rod advances, and accurate feed and tightening are realized. Since it is a rotating arm type, the movement range of the arm can be set to the inside, and the occupied space can be minimized. By making the stroke of the supply rod two-stage, hold the part on the supply rod in the first step and make the part reach the target position in the second step, simplifying the operation and securely tightening. You can Since the rotating arm and the rotating motor retreat independently of the supply rod, the supply rod can be advanced in a protruding state, and therefore, it is possible to easily supply and tighten the component to a narrow place or the like. ..

[Brief description of drawings]

FIG. 1 is a side view in which a part of the embodiment of the present invention is longitudinally cut.

FIG. 2 is a sectional view taken along line (2)-(2) of FIG.

FIG. 3 is a vertical sectional view showing a mechanism for applying a braking force.

FIG. 4 is a plan view when the component holding unit is in a chuck type.

FIG. 5 is a plan view when the component is a nut.

6 is a sectional view taken along line (6)-(6) of FIG.

FIG. 7 is a side view in which a part is longitudinally cut showing another embodiment.

8 is a sectional view taken along line (8)-(8) of FIG.

FIG. 9 is a sectional view taken along line (9)-(9) in FIGS. 1 and 7.

[Explanation of symbols]

 24 Rotating Arm 1 Bolt 51 Nut 4 Supply Rod 5 Engagement Hole 21 Rotating Motor 25 Component Holding Part

Claims (4)

[Claims] 1. A bolt or nut or the like is held near the tip of a rotating arm, and the rotating arm is turned to stop the bolt or nut or the like on the axis of the advancing / retracting supply rod, and then the supply rod is engaged. After inserting the bolt or nut into the hole, retract the rotating arm to the original position,
Next, a method for tightening the supply of bolts, nuts, etc., characterized in that when the supply rod advances, the parts reach the target location and are tightened. 2. The advance of the supply rod according to claim 1,
A bolt or nut, which has a stepped stroke, in which a component is fitted in the engagement hole of the supply rod in the first stage stroke and is made to reach the target location in the second stage stroke for tightening. Supply tightening method for etc. 3. The method for tightening the supply of bolts or nuts according to claim 1, wherein at least the rotary arm and the rotary motor thereof are retracted independently of the supply rod. 4. A component holding portion is formed in the vicinity of the tip of a rotary arm driven by a rotary motor, and the rotary arm is rotated to stop the component on the axis of a supply rod that rotates and moves back and forth. A supply tightening device for bolts, nuts, etc., characterized in that the installation position of the supply rod is determined and the component is fitted into the engagement hole of the supply rod by the movement of the rotating arm or the supply rod.