JPH0723087Y2 - Riveter - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riveter for crimping a sheet metal or the like using a blind rivet.

[0002]

2. Description of the Related Art Hitherto, various kinds of riveters have been proposed, and as an example, a hand riveter shown in JIS B 4627, Japanese Patent Application No. 4-200665, Japanese Patent Application No. 4-269656, and Japanese Patent Application No. 4-269656. Examples include a continuous riveter and the like shown in No. 360303.
In the conventional riveter, the core of the blind rivet that is cut at the time of crimping is sucked by evacuating the inside of the core storage case and stored in the core storage case via the core recovery pipe.

An example of the continuous riveter shown in Japanese Patent Application No. 4-360303 will be described with reference to FIGS. 2 to 14. That is, the conventional continuous riveter has a main body D and a drive unit E.
And a rivet supply unit F and a valve unit G, and FIGS. 2 and 3 show a state in which the push button of the trigger valve is released.
4 to 9 show a state where the push button of the trigger valve is pushed.

The drive portion E includes a small-diameter oil cylinder 210 branched laterally from the main body D and the oil cylinder 21.
It has a large-diameter air cylinder 200 that drives a zero oil piston 211. And the air cylinder 2
The oil piston 211, which is the piston rod, is integrally formed with the piston 220 incorporated in the No. 00. The oil cylinder 210 is a chuck cylinder 4
00, the chuck cylinder 400 communicates with a chuck cylinder 400 through a hole 470 in the side wall of the chuck cylinder 400 that communicates with an oil chamber 450 that is a space formed between the jaw case piston 500 and the nose piston 600.

The second port is the air cylinder 20.
No. 0 piston front chamber 201, the vacuum ejector 420, and the air chamber 480 (FIG. 6) between the nose piston 600 and the rod cover 460, respectively, and the other port f on the outlet side of the operation valve 900 is supplied. (Figure 3)
Is in communication with.

The first port is an air cylinder 200.
The compressed air is supplied to the rear chamber 202 (FIG. 4), which is the rear portion of the piston, and is communicated with one port e on the outlet side of the operation valve 900 described later. Is a third port for supplying the compressed air in the rear chamber 202 of the air cylinder 200 to the pilot air circuit Y of the operation valve 900 at the forward position of the piston 220 (FIG. 4). A storage case 750 of the rivet supply section F is fixed to the lower end of the air cylinder 200 by a pin 340.

In the main body D, a chuck cylinder 400 is integrally formed with the oil cylinder 210 at a substantially right angle, a mandrel housing case 410 for housing the mandrel 741 of the blind rivet 740 is mounted on the upper part thereof, and a lower part is mounted on the lower part thereof. The rivet supply part F is installed. The shaft storage case 41
At the upper end of 0, a vacuum ejector 42 for vacuuming the inside of the case
0 is attached. The chuck cylinder 400
A rod cover 460 is mounted on the lower end of the jaw case piston 500, and a bowl-shaped piston 550 with the upper end opened is provided at the upper part of the jaw case piston 500, thereby forming an upper air chamber 440 and a lower oil chamber 450. It is installed in the state of defining.

A lower portion of the chuck cylinder 400 is a jaw case 510, which is fixed to the lower end of the bowl-shaped piston 550. A tapered surface 511 is formed on the inner surface of the tip of the jaw case 510. A pair of jaws 540 is slidably fitted to the tapered surface 511. The jaws 540, 540 are urged downward and outward by a spring 520 housed in the jaw case 510 via a sharpened jaw pusher 530.

Then, a mandrel recovery pipe 430 is inserted into the jaw case 510, and an upper part thereof is fixed to the mandrel housing case 410 in a state of penetrating the bottom plate. A nose piston 600 is disposed below the jaw case piston 500 to define an upper oil chamber 450 and a lower air chamber 480, and a cylindrical body 610 formed at a lower end of the nose piston 600 is provided in the chuck. A rod cover 460 at the lower end of the cylinder 400 is slidably inserted, and a nose piece 620 is attached to the lower end of the cylindrical body 610.

In the state shown in FIGS. 2, 6, 7 and 8, the jaw case 51 is attached to the lower wall 611 (FIG. 11) of the cylindrical body 610.
The tips of the jaws 540 are in contact with the nosepieces 620 having the tips of 0 protruding from the lower wall 611 in a V shape. The nose piece 620 is provided with a hole through which the mandrel 741 of the blind rivet 740 is inserted, and an elastic ring 621 (FIG. 11) is attached to the tip end of the blind rivet 740 to slide the mandrel 741 elastically. The blind rivet 740, which is freely held and inserted, is constructed so as not to fall during the work.

On the side wall of the chuck cylinder 400,
A pipe line 490 is provided which communicates with the lower air chamber 480 and the upper vacuum ejector 420, and the second passage 490 is provided in the middle of the pipe passage 490.
A hole 470 communicating with the port is provided.

As shown in FIGS. 2, 4, 6 to 8 and 10, the rivet supply section F is a tape air cylinder 710.
The blind rivet holder 740 is made of polypropylene or the like and has a U-shaped cross section. The blind rivet holder 740 has a feed hole 732 and upper and lower tabs 731 and 731 at regular intervals. A gap 733 between
(FIG. 10), and the cut groove 734 is formed at the tip of the tab 731.
(FIG. 10) and has a rivet body 742 and a mandrel 741 of the blind rivet 740 in the kerf 734.
And are held. As shown in FIG. 10, a tape piston 712 biased forward by a spring 711 is housed in the tape air cylinder 710, and a shaft 713 having a feed claw 713a is inserted into the tape piston 712. And is set with a screw 714 for retaining.

A ridge (not shown) for guiding the blind rivet holder 730 is formed on the guide plate 720, and a long hole 72 through which the feed claw 713a reciprocates.
2 is open. The blind rivet holder 7
30 is elastically pressed against the guide plate 720 by a leaf spring 770 (FIG. 10) for preventing displacement, and is also provided with a check claw 723 that acts on the blind rivet 740. The leaf spring 770 for preventing the slippage elastically guides the blind rivet holder 740 to the guide plate 72.
It is pressed down to 0 to prevent the blind rivet holder 740 from being displaced from a predetermined position. 750 is a storage case.

The valve section G is as shown in FIGS. 3, 5 and 9, and 900 is an operation valve for the air cylinder 200.
Is a 2-position pilot switching valve, and 800 is a trigger valve, which is attached to the position shown by the inner chain line where the oil cylinder 210 and the chuck cylinder 400 intersect, and pushes the push button 810. It is designed to be released.

In the figure, reference numeral 801 denotes a compressed air source such as a compressor, h and o are open to the atmosphere, and the outlet side ports e and f of the operation valve are the ports and
, And the ports communicate with the pilot air circuit Y, respectively. Further, the outlet port m of the trigger valve communicates with the pilot air circuit X of the operation valve and the upper end port of the chuck cylinder 400, and the port n communicates with the inlet port g of the operation valve 900.

Further, the rod cover 460 is provided with a port through which the air chamber 480 communicates with the port k of the tape air cylinder 710, and when the nosepiece 600 is raised to the top dead center (FIG. 8), Body 61
The compressed air in the air chamber 480 is supplied to the tape air cylinder 710 through the groove 612 at the bottom of the 0 (FIG. 9).

The conventional continuous riveter operates as follows. Normally, the blind rivet holder 740 is stored in a storage case 750 of a continuous riveter in a wound state,
2 and FIG. 3 when not crimped, the push button 810 (trigger) is released, and the blind rivet 740 is attached to the nose piece 620 by the elastic ring 621.
It is elastically held by and is prevented from falling down.

Blind rivets 74, as shown in FIG.
No. 0 rivet body 742 is inserted into the hole of the sheet metal 760 and the push button 810 is pushed, as shown in FIG.
Since 0 moves, the compressed air passes through the port s → n, passes through the port g → e of the operation valve 900 and flows into the rear chamber 202 of the air cylinder 200 from the port, and the piston 220 moves forward. Move forward, oil chamber 2
Twelve oils flow into the oil chamber 450 of the chuck cylinder 400, so that the jaw case piston 500 is pushed up by a predetermined distance.

Therefore, the jaw case 510 moves up.
In this case, the pair of jaws 540 is the jaw pusher 530.
Since the jaw 540 is urged downward by the spring 520 via the
11 slides downward to project downward, and as they approach each other, the blind rivet 740 rises while gripping the mandrel 741. The blind rivet 740 is caulked by the ascent of the mandrel 741, and then the rivet body 742 is stopped at the tip of the nose piece 620, so that the mandrel 741 is cut.

In this case, the air chamber 480 and the air cylinder 2
No. 00 front chamber 201 is open to the atmosphere from the port through the ports f → h of the operation valve 900, so the nose piston 600 is pressed downward and only the jaw case piston 500 rises. Piston 2 as above
When 20 moves forward, the compressed air in the rear chamber 202 is supplied to the pilot air circuit Y through the port, the operation valve 900 moves forward, and the state shown in FIG. 11 is reached. The compressed air from the compressed air source 801 passes through the ports s → n → g → f. The compressed air in the rear chamber 202 of the air cylinder 200 supplied to the port passes through the ports e → h, and the compressed air in the pilot air circuit X and the air chamber 440.
The compressed air is released to the atmosphere through port m → o.

Therefore, as shown in FIGS. 6 to 8, the jaw case piston 500 and the nose piston 600 ascend to the top dead center. In FIG. 6, the oil piston 211 is returned (the piston 220 is naturally returned), and the nose piston 600 is shown.
Rises, returns to a position close to the bowl-shaped piston 550, and compressed air is blown into the vacuum ejector 420, so that the vacuum in the mandrel housing case 410 is started. Further, the nose piston 600 rises with respect to the jaw case piston 500, the lower wall 611 of the cylindrical body 610 contacts the lower end of the jaw case 510, and the nose piece 6
The upper end of 20 pushes up the tip of the jaw 540, so that the jaw 540 is in a released state.

FIG. 7 shows the jaw case piston 500 and the nose piston 600 in the middle of ascending.
1 through the mandrel recovery pipe 430, the mandrel storage case 41
The state of being sucked up in 0 is shown.

FIG. 8 shows a state in which the jaw case piston 500 and the nose piston 600 are both at the top dead center. At this time, compressed air from the port is supplied to the tape air cylinder 7.
Since it is supplied to the port K of 10, the tape piston 71
2 moves forward, the feed claw 713a advances along the long hole 722, and the feed claw 713a engaged with the feed hole 732 of the blind rivet holder 730 pulls the blind rivet holder 730 out of the storage case 750 and guides it. Board 7
The tip of the mandrel 741 is set on the shaft center below the nose piece 620 by moving one pitch along the ridge of 20.

Next, when the push button 810 is released, the valve portion G is brought into the state shown in FIG. 3 and the trigger valve 800 returns to the original position by the force of the spring 820, so that the compressed air of the compressed air source 801 passes through the port m and is operated. Since it is supplied to the pilot air circuit X of the valve 900, the operation valve 900
Will also retreat. At this time, the compressed air in the pilot air circuit Y passes through the port → and is released from the ports f → h into the atmosphere.

At the above valve position, the compressed air passes through the port s → m of the trigger valve 800 and from the port to the air chamber 44.
0, and the compressed air in the air chamber 480 is port → f → h
Released into the atmosphere through the jaw case piston 500
Since both the nose piston 600 and the nose piston 600 descend to the bottom dead center, the jaw 540 opened through the nose piece 620 holds the mandrel 741 of the blind rivet 740 and the tip of the nose piece 620 holds the blind rivet. The upper and lower tabs 731 of the body 730 are bent downward and lowered. The lowering of the nose piece 620 will be described in detail with reference to FIGS. 11 to 14.

When the nose piece 620 descends, the supply of compressed air to the tape air cylinder 710 is stopped, and the compressed air from the tape air cylinder 710 is released, so that the tape piston 712 retreats to its original position by the action of the spring 711, but the blind does not appear. The rivet holder 730 has a non-return pawl 723.
Since the blind rivet holder 730 is stopped, the feed claw 713a moves out of the feed hole 732 by one pitch and moves forward by one pitch, and engages with the feed hole 732 in front. At this time, the blind rivet holder 730 is attached to the guide plate 720 to prevent the leaf spring 7 from slipping.
Since it is elastically pressed by 70, it reliably engages the feed pawl 732 without displacement.

Thus, the preparation for caulking the blind rivet 740 is completed. The subsequent operation is the same as the operation described above, and the blind rivet 740 can be continuously caulked by repeating the above operation.

11 to 14 show a state in which the nose piece 620 is lowered, and FIG. 11 is a blind rivet 740.
Shows the state in which one piece is sent, the head 7 of the rivet body 742
42 a is located inside the lower tab 731. 12 shows that the mandrel 741 is inserted into the nose piece 620,
The tip of the nose piece 620 shows a state in which the upper tab 731 is about to be bent.

In FIG. 13, the nosepiece 620 is further lowered, the upper tab 731 is completely bent, and the mandrel 741 is inserted through the nosepiece 620 and loosely fitted in the jaw 540, and abuts on the tip of the nosepiece 620. Rivet body 7
The head 742a of 42 shows a state in which the lower tab 731 is slightly bent, and the base end of the lower tab 731 is the protrusion 7 of the lower guide.
Since it is supported by 25, the protrusion 725 and the head 7
The blind rivet 740 overcomes the resistance of the elastic ring 621 due to the resistance force required by 42a to bend the lower tab 731 and completely completes the nosepiece 6 up to the head 742a.
20 is inserted.

FIG. 14 shows a state in which the blind rivet 740 is completely inserted into the nose piece 620, descends to the bottom dead center, and the lower tab 731 is also completely bent.

[0031]

However, the conventional continuous riveter has the lid 4 fitted on the upper end of the storage case 410.
Since the lower surface 411a of 11 is perpendicular to the mandrel recovery pipe 430, compressed air is blown into the vacuum ejector 420, the inside of the mandrel housing case 410 approaches vacuum, and the mandrel 741 passes through the mandrel recovery pipe 430. When it is sucked up vigorously into the mandrel storage case 410, it collides with the lower surface 411a of the lid 411 and returns to the mandrel recovery pipe 430 to squeeze the mandrel recovery pipe 430, or near the outlet of the mandrel recovery pipe. There is a drawback that they are accumulated and hinder the storage of the mandrel 741.

In view of the above, the present invention aims to provide a riveter that solves the above-mentioned conventional drawbacks.

[0033]

In order to achieve the above object, the present invention has a hole having a hole formed at the tip and a smaller diameter around the hole on the inner surface of the cylinder having a nose piece at the lower end. Nosepiece in which a cylindrical jaw case having a tapered surface is inserted so as to be able to move forward and backward, and a pair of jaws urged downward by springs through a jaw pusher by a spring are slidably fitted into the tapered surface of the jaw case. Part of the jaw case and a core shaft storage case equipped with a vacuum ejector for decompressing the inside of the case are connected by a core shaft recovery pipe, and the core shaft of the blind rivet cut at the time of crimping with the nose piece part is In a riveter that is sucked by decompressing the inside of the shaft storing case and stored in the shaft storing case via a shaft collecting pipe, a core collecting pipe of the shaft storing case. Characterized in that the wall has an inclined surface among which the outlet facing. Further, the inclined surface of the inner wall surface of the mandrel housing case is pyramidal.

[0034]

[Operation] When compressed air is blown into the vacuum ejector, the vacuum inside the core storage case starts, and the core of the blind rivet cut during caulking passes through the core recovery pipe and vigorously enters the core storage case. It is released and collides with the inner wall surface facing the outlet of the mandrel recovery pipe, but since this inner wall is formed in a slant or cone shape, the mandrel scatters outward from the center of the mandrel recovery pipe. Then, they are sequentially accumulated from the outside inside the mandrel storage case. Therefore, the mandrel does not bounce on the mandrel recovery pipe and does not interfere with the housing of the mandrel.

[0035]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a partial vertical cross-sectional view of the vicinity of a core shaft storage case showing an embodiment of the present invention.

In FIG. 1, reference numeral 412 denotes a storage case 410.
Of the lid, 412a is a lower surface thereof, 741 is a mandrel of the blind rivet 740, 430 is a mandrel recovery pipe, 420 is a vacuum ejector, and 490 is a conduit. As shown in FIG. 1, the mandrel housing case 410 is provided with a lid 412 at the open end of the upper end.
Is detachably fitted, and the O-ring 4 is inserted in the fitting part.
12b is attached and sealed so that it is detachable.

The lower surface 412a of the lid 412 is formed obliquely. As shown by a chain line a in FIG. 1, the lower surface can be formed in a cone shape such as a cone shape or a pyramid shape.

According to the lid 412 having the structure of the present invention, the jaw case piston 500 holding the mandrel 741 of the blind rivet 740 is lifted to move the blind rivet 74.
0 is crimped, and the rivet body 742 moves from the mandrel 741.
And the vacuum ejector 420 is actuated to decompress the inside of the mandrel housing case 410, and the mandrel 741 is sucked up into the mandrel housing case 410 through the mandrel collection pipe 430. Is the inclined surface 41 of the lower surface of the lid 412
Since it collides with the shaft 2a, it is splashed outward from the shaft center, and the shaft 741 is accumulated from the outside inside the shaft storage case 410.

In the above-mentioned embodiment, the lower surface structure of the lid of the mandrel housing case is described, but the present invention is intended for the inner wall surface facing the outlet of the mandrel recovery pipe in the mandrel housing case. .

[0040]

As described above in detail, according to the present invention, the core shaft of the blind rivet cut at the nose piece portion during crimping is sucked by depressurizing the inside of the core shaft storage case, and the core shaft recovery pipe is In the riveter to be housed in the mandrel storage case via, since the inner wall surface facing the outlet of the mandrel collection pipe of the mandrel storage case is an inclined surface or a cone shape, the mandrel sucked into the mandrel storage case is , It collides with the inclined surface or the conical surface of the opposing inner wall surface, and scatters outward in the mandrel storage case. Therefore, the bobbin shaft recovery pipe is squeezed in the bobbin shaft recovery pipe and is collected from the outside of the bobbin shaft storage case, so that the bobbin shaft storage can be smoothly stored and recovered without being disturbed.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of the vicinity of a mandrel storage case showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a conventional continuous riveter, showing a state where a push button attached to the continuous riveter is released and a trigger valve and an operation valve are in normal positions.

FIG. 3 is a circuit diagram of a valve showing a conventional continuous riveter, which is generally shown in combination with FIG. 2 and FIG.

FIG. 4 is a cross-sectional view showing a conventional continuous riveter, showing a state where only a trigger valve is switched by pressing a push button attached to the continuous riveter.

FIG. 5 is a circuit diagram of a valve showing a conventional continuous riveter, which is generally shown in combination with FIG. 4 and FIG.

FIG. 6 is a cross-sectional view showing a conventional continuous riveter, showing a state in which a push button attached to the continuous riveter is pressed and both the trigger valve and the operation valve are switched.

FIG. 7 is a cross-sectional view showing a conventional continuous riveter, showing a state in which a push button attached to the continuous riveter is pressed and both the trigger valve and the operation valve are switched.

FIG. 8 is a cross-sectional view showing a conventional continuous riveter, showing a state where a push button attached to the continuous riveter is pressed and both the trigger valve and the operation valve are switched.

FIG. 9 is a circuit diagram of the valve in the state shown in FIGS.

FIG. 10 is a cross-sectional view of a rivet supply unit.

FIG. 11 is a partially sectional front view of a rivet supply part of a conventional continuous riveter, showing a relationship with a blind rivet holder when a nose piece descends.

FIG. 12 is a partially sectional front view of a rivet supply part of a conventional continuous riveter, showing a relationship with a blind rivet holder when a nose piece descends.

FIG. 13 is a partially sectional front view of a rivet supply unit of a conventional continuous riveter, showing a relationship with a blind rivet holder when a nose piece descends.

FIG. 14 is a partially sectional front view of a rivet supply part of a conventional continuous rivet, showing a relationship with a blind rivet holder when a nose piece descends.

[Explanation of sign]

 210 Oil Cylinder 211 Oil Piston 200 Air Cylinder 201 Front Chamber 202 Rear Chamber 212 Oil Chamber 220 Piston 400 Chuck Cylinder 410 Core Shaft Storage Case 411, 412 Lid 411a, 412a Lower Surface 412b O-ring 420 Vacuum Ejector 430 Core Shaft Recovery Pipe 440, 480 Air chamber 450 Oil chamber 460 Rod cover 470 Hole 490 Pipeline 500 Jaw case piston 510 Jaw case 511 Tapered surface 520 Spring 530 Jaw pusher 540 Jaw 550 Bowl-shaped piston 340 pin 600 Nose piston 610 Cylindrical body 611 Lower wall 6 12 groove 612 Piece 621 Elastic ring 621a Y packing 621b Scraper 622 Holding ring 710 Tape air cylinder 711 Spring 712 Tape piston 713 Shaft 713a Feeding claw 714 Screw 720 Guide plate 722 Long hole 723 Checking claw 725 Protrusion 730 Blind rivet holder 731 Upper and lower tabs 732 Feeding hole 733 Gap 734 Cutting groove 740 Blind rivet 741 Spindle 742a Rivet body 74 Head 750 Storage case 760 Sheet metal 800 Trigger valve 801 Pressure source 810 Push button 820 Spring 900 Operation valve 940 Muffler X, Y Pilot circuit E Drive unit F Rivet supply unit G Valve unit

Claims (2)

[Scope of utility model registration request] 1. A cylindrical body having a nose piece at its lower end,
A cylindrical jaw case having a hole is formed at the tip and a tapered surface is formed on the inner surface of the tip, the diameter of which is made smaller toward the tip around the hole. The jaw case is inserted in a retractable manner, and a jaw pusher is attached to the tapered surface of the jaw case by a spring. Via a pair of jaws that are slidably fitted downwardly through the jaw case, and a core axis storage case having a vacuum ejector for depressurizing the inside of the case. In the riveter, which is connected to the core shaft of the blind rivet cut at the time of crimping with the nose piece portion, is sucked by depressurizing the inside of the shaft storage case and stored in the shaft storage case via the shaft recovery pipe. A riveter characterized in that an inner wall surface of the shaft storage case facing the outlet of the core shaft recovery pipe is an inclined surface. 2. The continuous riveter according to claim 1, wherein the inclined surface of the inner wall surface of the mandrel housing case has a conical shape.