JP2584378Y2 - Bolt and nut assembly device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt and nut screwing device for screwing a bolt to a nut with a constant allowance.

[0002]

2. Description of the Related Art Conventionally, a bolt and nut assembling apparatus shown in FIG. 9 has been practically used. That is, the air tool 81 is fixed to an appropriate place and connected to a power supply via the foot switch 82,
A socket 83 is provided at the tip. When screwing the nut N and the bolt V together, the nut N is temporarily assembled in advance to the bolt V (two or three threads are screwed), and then the nut N is fitted into the socket 83.

[0003] Thereafter, the foot switch 82 is turned on to activate the air tool 81 and rotate the socket 83, thereby screwing the nut N forward. Then, when the screw is appropriately advanced, the foot-operated switch 82 is turned off to stop the air tool 81, and the member in which the bolt V and the nut N are screwed is pulled out of the socket 83, and the next screwing operation is performed. To start.

[0004] As shown in FIG. 10, such a member previously screwed with the bolt V and the nut N is screwed to a bracket 84 provided on the vehicle body to serve as a stopper bolt for the clutch pedal 85. Used or Figure 11
As shown in, the steering member 86 is screwed,
Used as a stopper bolt for steering angle.

[0005]

However, as described above, conventionally, prior to setting the nut N in the socket 83 of the air tool 81, the nut N must be temporarily assembled to the bolt V in advance. Therefore, the need for manual work is not only disadvantageous in terms of cost, but also has a natural limitation in work speed. Further, since the screwing allowance of the nut N differs depending on the on-time of the foot switch 82, the variation in the allowance of the bolt V relative to the nut N occurs for each product. Therefore, FIGS.
As shown in the above example, when the bolt V is used as a stopper bolt or the like, the protrusion of the bolt V must be adjusted again.

The present invention has been made in view of such a conventional problem, and a bolt-and-nut assembling apparatus capable of screwing the bolt to the nut with a uniform allowance without requiring any manual operation. The purpose is to provide.

[0007]

According to the present invention, there is provided a bolt transfer path for transferring a bolt and sequentially dropping from a path end, and provided below the bolt transfer path. A nut transfer path for sequentially transferring nuts, a positioning member provided at a path end of the nut supply path, a set position for positioning the supplied nut, and a retractable position for retracting while leaving the nut, and a slidable positioning member; Located between the path end of the positioning member and the bolt supply path,
A screw device that receives the bolt dropped from the end of the path in a passable state and screws the bolt to the nut positioned by the nut positioning member, and a bolt screwed to the nut by the screw device. Means for detecting that a rise has occurred, relay means for stopping the screwing device in response to the detection operation of the rise detection means, and response to the detection operation of the rise detection means. And driving means for driving the positioning member to the retracted position and then to the set position.

[0008]

In the above construction, the nut transferred on the nut transfer path is positioned at the end of the path by the positioning member located at the set position. On the other hand, the bolt is transferred on the bolt transfer path and falls from the end of the path. The bolt dropped from the end of this path is received by the screwing device and screwed into the nut positioned on the positioning member. Thus, when the bolt projects from the nut and reaches a predetermined margin, the predetermined margin is detected by the margin detection means.

Then, in response, the relay means and the driving means are operated, and in the relay means, the screwing device is stopped. Therefore, the bolt is screwed into the nut in a state where the allowance is predetermined. Further, since the driving means drives the positioning member to the retracted position, the nut that has been positioned by the positioning member until then,
It is released from the positioning and becomes a state where it can be dropped.

At this time, since the screwing device receives the bolt in a passable state, the bolt is dropped together with the nut when the nut is released from the positioning and falls. Then, when the bolt and the nut thus screwed fall, the driving means drives the positioning member to the set position again.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. That is, the bolt transfer path 1 shown in FIG. 1 is connected to the parts feeder at an end outside the figure. The parts feeder is a known drum type, which rotates the drum, vibrates the bolt transfer path 1, aligns the bolt V in a vertical state with the bolt head at the upper end, and moves the bolt V to the bolt transfer path 1. .

The bolt transfer path 1 is inclined.
A hopper 2 is provided at the end of the path. As shown in FIG. 2, the hopper 2 is formed in a tapered shape and has an opening 2a at a lower end. A single drop mechanism 3 is provided on the bolt transfer path 1 on the front side of the hopper 2. The single dropping mechanism 3 has an upper vertical plate 4 and a lower vertical plate 5 orthogonal to the bolt transfer path 1, and as shown in FIG. Notches P and B through which the bolt V can pass are provided. The vertical plates 4 and 5 are slidably inserted into opposing side walls 1 a and 1 b of the bolt transfer path 1, and have a piston rod of a bolt dropping cylinder 39 described later at an end. Are combined.

When the piston rod is extended and the notch P is made to coincide between the side walls 1a and 1b of the bolt transfer path 1, only one bolt V passes through the notch P to the lower side of the side wall 1a. , 1b. From this state, when the notch b is made to conform to the bolt transfer path 1 by contracting the piston rod, the bolt V in contact with the lower vertical plate 5 relatively moves as the lower vertical plate 5 slides. . Then, when the notch Q of the lower vertical plate 5 matches the bolt transfer path 1, the bolt V drops through the notch Q and the hopper 2. At this time, since the upper part of the notch Q is closed by the upper vertical plate 4, only a single bolt V falls from the hopper 2. Therefore, by operating the piston rod so that the notch P and the notch Q coincide with the bolt transfer path 1 alternately, the bolts V are sequentially dropped from the hopper 2 one by one.

Immediately below the opening 2a of the hopper 2, a socket box 7 provided in the screwing device 6 is arranged. The screwing device 6 includes the socket box 7, a sub-assembly rotation motor 8, and a driving pulley 9 of the sub-assembly rotation motor 8 and a belt 10 mounted between the socket box 7. It is formed in a penetrating shape.

As shown in FIG. 5, the socket box 7 is vertically inserted into a horizontal frame 13 bridged between upper ends of a pair of vertical frames 11 and 12, and has a peripheral portion. A bearing 14 is provided. Thus, the socket box 7 is held by the horizontal frame 13 in a rotatable state.

As shown in FIG. 1, below the horizontal frame 13, there is provided a long base 15 which extends between the vertical frames 11 and 12 and extends on both sides. The base 15 includes an upper portion 16 in one direction from the vertical frames 11 and 12, and a lower portion extending between the vertical frames 11 and 12 in the other direction.

The upper stage 16 includes a nut transfer path 18.
The nut transfer path 18 is connected to a parts feeder at an end (not shown). The parts feeder is also a known drum type, and rotates the drum and vibrates the nut transfer path 18 to align and transfer the nuts N in the grooves 19.

A single nut feed mechanism 20 is provided on the front side of the end of the nut transfer path 18. The single nut feeding mechanism 20 has the same configuration as the single bolt removing mechanism 3 described above, and can feed the nut N one by one whenever the piston rod of the single nut feeding cylinder 38 described later expands and contracts. Form a ready state. Also,
An air blow outlet 21 is provided near the single feed mechanism 20. The nut N that can be fed one by one by the single feed mechanism 20 is transferred to the end of the nut transfer path 18 by the compressed air from the air blow outlet 21.

As shown in FIGS. 4 and 5, the lower step portion 17 is provided with a drop hole 22 at the base of the joint with the upper step portion 16. A positioning member 23 is disposed on the lower step portion 17. The positioning member 23 is movable in the longitudinal direction of the lower portion 17,
The slider slides between a set position connected to the end of the nut transfer path 18 and a retracted position retracted from the drop hole 22.

The positioning member 23 has a three-layer structure as shown in FIG. 6, and is constituted by laminating a lower plate 24, an intermediate plate 25 and an upper plate 26. Notches 24a, 25a, and 26a are provided at one end of each of the plates 24-26. The notches 24a and 26a of the lower plate 24 and the upper plate 26 have a diameter that allows the male screw to be loosely inserted by the bolt V, and the notch 25a of the intermediate plate 25 has a slightly larger diameter than the nut. N is formed into a polyhedral shape along the outer periphery.

The other end of the lower plate 24a is provided with flanges 27, 27 which are in sliding contact with the side surface of the lower portion 24, and a mounting plate 28 having a fixing hole 29 is provided on the upper surface. ing. As shown in FIG. 1, the piston rod 3 of the finished product dropping cylinder 30 fixed to the lower stage 17 is provided in the fixing hole of the mounting plate 28.
One tip is connected.

Next, the sensors used in this embodiment will be described. As shown in FIG.
In the vicinity of the single bolt removing mechanism 3 provided in the bolt transfer path 1, a bolt presence sensor A for detecting that the bolt V is present in the single bolt removing mechanism 3 is disposed. . In the vicinity of the one-nut feeding mechanism 20 provided in the nut feeding path 18, a nut presence sensor (entrance) for detecting that the nut N is present in the one-nut feeding mechanism 3. The sensor C is arranged. A nut occupancy (medium) sensor D that detects that the nut N is occupied in the notch 25a of the intermediate plate 25 is disposed on the positioning member 23. Further, as shown in FIG. 4, in the vicinity of the drop hole 22, when light is shielded by the end of the bolt V screwed to the nut N, a photoelectrically-assembled output that outputs a signal in response to the light is received. An alternative detection sensor E is provided.

FIG. 7 is a circuit diagram of the present embodiment, in which a power switch 32, a pilot lamp 33 and a timer TR are arranged in a circuit using 100 VAC as a power supply. The set time of the timer TR is T = 10M
If the sub-assembly rotary motor 8 is stopped for 10 minutes or more because the nut N and the bolt V in the perfeeder are not operated, that is, if the sub-assembly rotary motor 8 is stopped, the circuit is released by releasing the contact TR001. Shut off to prevent unnecessary power consumption.

The nut occupancy sensor A, the nut occupancy (entrance) sensor C, the nut occupancy (medium) sensor D, and the assembled outage detection sensor E are connected in parallel. A contact signal A00
1 is driven. The contact A001 turns on and off a motor 34 and a feeder 35 for rotating a drum provided in a bolt parts feeder.

The contact C001 is driven by the output signal of the nut presence (entrance) sensor C. The contact C001
Turns on / off a motor 36 for rotating a drum provided in a nut parts feeder and a feeder 37, and turns on / off a nut feeding cylinder 38.

The contact signal D001 is driven by the output signal of the nut presence (middle) sensor D. The contact D001
Turns on and off the single bolt dropping cylinder 39 and turns on and off the single nut feeding cylinder 38. Further, the contact E001 is driven by the output signal of the assembled appearance detection sensor E. The contact E00
1 turns on / off the relay 40 constituting the relay means of the present embodiment.

The relay 40 has a contact R1, which closes in response to the changeover detection and operates in a direction in which the piston rod 31 of the cylinder 30 for removing finished products contracts. Further, the contact R1 turns on the circuit of the sub-assembly rotary motor 8 in a state in which the assembled exit detection sensor E does not detect the output of the bolt V (external detection of no bolt), and Is detected, the circuit of the sub-assembly rotary motor 8 is turned off.

The circuit of the sub-assembly rotary motor 8 is provided with a timer TR2. The timer TR
2 has a timer circuit TR002. The timer circuit TR002 includes a reverse rotation circuit 45 and a normal rotation circuit 46. When the contact R1 is turned on by the relay 40, the timer TR sets the set time T = 2s.
ec, that is, the reverse rotation circuit 45 is energized for 2 seconds, and a current flows from the reverse rotation circuit 45 to the sub-assembly rotation motor 8. After that, the normal rotation circuit 46 side is turned on,
A current flows from the forward rotation circuit 46 to the sub-assembly rotation motor 8.

Accordingly, the sub-assembly rotation motor 8 reversely rotates for two seconds at the initial stage of the start, and then starts normal rotation. Then, when the sub-assembly rotation motor 8 rotates reversely for 2 seconds,
The bolt V rotates on the nut N without being screwed. Thereby, the position of the end of the male screw portion of the bolt V is aligned with the screw hole of the nut N, so-called mountain biting is prevented, and after that, the screw is rotated forward to start screwing.

The nut air blow cylinder 42 for supplying compressed air to the air blow outlet 21 has
The cylinder switches 43 and 44 are connected in series. One cylinder switch 43 is turned on when the piston rod 31 of the finished product dropping cylinder 30 is extended. In addition, the other cylinder switch 44 forms a state in which the piston rod of the nut-one-feed cylinder 38 is returned and the nut-one-nut feed mechanism 20 can feed the nuts N one by one as described above. When it is turned on.

Therefore, the air blow cylinder 42
The piston rod 31 of the finished product dropping cylinder 30 extends, and the positioning member 23 is at the set position.
In addition, the one-nut feeding mechanism 20 operates in a state in which one nut N can be fed, and sends out compressed air from the air blow outlet 21. Thereby, the single nut N driven by the compressed air is pressure-fed into the notch 25a provided in the intermediate plate 25 of the positioning member 23 at the set position.

Next, the operation of this embodiment having the above configuration will be described with reference to the operation flowchart shown in FIG. That is, a state in which one nut N can be fed into the one-nut feeding mechanism 20 is formed, and when this is detected by the nut presence (entrance) sensor C, the air blow cylinder 42
Operates to supply compressed air from the air blow outlet 21. Thereby, as described above, the single nut N is fed into the notch 25a of the intermediate plate 25 provided in the positioning member 23 at the set position (nut fixed position) (step).

Next, the sub-assembly rotation motor 8 rotates to drive the socket box 7 via the belt 10,
The socket box 7 rotates (step). Subsequently, the single bolt dropping mechanism 3 operates (step), and the single bolt V falls into the socket box 7 via the hopper 2. At this time, since the socket box 7 has already started to rotate, the hexagonal bolt V in the dodecagonal socket box 7 is properly fitted, and the lower end of the bolt V is a screw hole of the nut N. Come on. Also,
As described above, since the sub-assembly rotation motor 8 starts to rotate forward after rotating backward for 2 seconds,
Are also reversed, thereby preventing the mountain biting.

When two seconds have elapsed, the sub-assembly rotation motor 8 starts rotating forward, whereby the bolt V fitted in the socket box 7 is driven to rotate, and screwing into the nut N is started. (Step). As a result, when the lower end portion of the bolt V protrudes from the nut N and the assembled replacement detection sensor E detects this (step), the relay 40 turns off the contact R1 as described above,
As a result, the sub-assembly rotary motor 8 stops, and at the same time, the finished product dropping cylinder 30 operates (opens) (step).

Therefore, the positioning member 23 located at the set position moves to the retracted position by the contraction of the piston rod 31 of the finished product dropping cylinder 30. For this reason, it is received in the notch 25a of the intermediate plate 25,
The nut N supported by the peripheral portion of the notch 26a of the lower plate 26 loses support and falls downward from the drop hole 22 while being screwed with the bolt V (step).

When the above steps 1 to 3 are completed, the piston rod 31 of the finished product dropping cylinder 30 is extended, and the positioning member 23 is driven to the initial position, ie, the set position. Be started. Therefore, by repeating the steps (1) to (4), the finished products in which the bolts V and the nuts N are meshed with each other and in which the allowance of the bolts V is constant fall sequentially through the pits 22.

[0037]

As described above, according to the present invention, the bolt is screwed into the nut positioned by the positioning member, and the bolt is screwed when the bolt screwed to the nut has a predetermined margin. Was stopped, and the positioning member was retracted. Therefore, the bolt and the nut are automatically screwed together, and not only can the two screws be screwed efficiently and at low cost without the need for manual work, but also the allowance of the bolt is kept constant. be able to. Therefore, when used as a stopper bolt or the like, it is not necessary to adjust the protrusion of the bolt again, and the work of adjusting the protrusion at the time of use can be eliminated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire structure of an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a structure of a path end of a bolt transfer path according to the embodiment.

FIG. 3 is a side view showing components of a single bolt dropping mechanism.

FIG. 4 is a sectional view taken along line aa of FIG. 1;

FIG. 5 is a sectional view taken along the line bb in FIG. 4;

6A is a plan view of a positioning member, FIG. 6B is a left side view thereof, and FIG. 6C is a front view thereof.

FIG. 7 is a circuit diagram of the present embodiment.

FIG. 8 is an operation flowchart of the embodiment.

FIG. 9 is a perspective view of a conventional device.

FIG. 10 is a side view showing an example using a member including a bolt and a nut.

FIG. 11 is a side view showing another example using a member including a bolt and a nut.

[Explanation of symbols]

 Reference Signs List 1 bolt transfer path 6 screwing device 18 nut transfer path 23 positioning member 30 cylinder for removing finished product (drive means) 40 relay V bolt N nut E assembled output detection sensor (detection means)

Claims (1)

(57) [Scope of request for utility model registration] 1. A bolt transfer path for transferring a bolt and sequentially dropping it from an end of the path, a nut transfer path provided below the bolt transfer path for sequentially transferring nuts, and a path end of the nut supply path. A positioning member provided and slidable to a set position for positioning the supplied nut, and a retracted position for retracting while leaving the nut; and a path positioned between the positioning member and a path end of the bolt supply path. A screwing device for receiving the bolt dropped from the end in a passable state and screwing it to the nut positioned on the nut positioning member; and a bolt screwed to the nut by the screwing device. A change-over detecting means for detecting that a change has occurred, a relay means for stopping the screwing device in response to the detecting operation of the change-over detecting means, and a detecting operation of the change-over detecting means. And a driving means for driving the positioning member to the retracted position and then to the set position in response to the positioning member.