JPS60240350A - Rivet caulking machine - Google Patents

Abstract

PURPOSE:To caulk a rivet in a prescribed position without a damage, etc. on a work by supplying the rivet to the prescribed position and actuating a lifting cylinder under the prescribed working pressure after the supply of the rivet. CONSTITUTION:The 1st selector valve 53 of a driving circuit 46 is changed over by the detection signal from a detecting sensor by which the piston 50 in the air chamber 48 of an air booster 47 is lowered. A piston rod 51 is lowered at the same instant and the top end thereof is inserted into the pressure intensifying part 52 of a hydraulic chamber 49. The pressure of the oil in the part 52 is therefore intensified by which the prescribed working pressure is obtd. The lifting cylinder 8 is actuated by the working pressure to supply the prescribed pressing force to the rod 9 thereof. The rod 9 is thereby moved further upward to turn a turning arm which supplies the prescribed pressing force to a stem. The stem caulks consequently the rivet supplied into the work surely with the prescribed pressing force.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rivet caulking machine configured to caulk a rivet fed to a predetermined position by movement of a stem.

BACKGROUND OF THE INVENTION Conventionally, many rivet caulking machines have been used because firm fastening is required when fastening soft materials such as leather products or brake shoes. This rivet caulking machine has a stem that can be freely lowered by a cylinder and an anvil at a position corresponding to the stem, and the rivet supplied below the stem is inserted into a predetermined working position on the workpiece by the stem, and the lower end is held by the anvil. Constructed to clinch.

Problems to be Solved by the Invention In this type of rivet nose tightening machine, when the rivet supplied below the stem is inserted into a predetermined working position on the workpiece, even if the position of the workpiece is slightly different, If this happens, the rivet may collide with the workpiece. In this case, if the cylinder is pressurized to supply a predetermined pressing force to the stem, a huge force will be applied to the rivet, causing the rivet to be compressed on the surface of the workpiece, resulting in disadvantages such as damage to the workpiece. ing.

Means for Solving the Problems The present invention aims to eliminate the above-mentioned drawbacks.The present invention has a stem that can be raised and lowered by a cylinder, an anvil that is arranged in correspondence with the stem, and a guide pin attached to the anvil. is retractably arranged, and a detection pin is arranged on the path of movement of this guide pin.

Furthermore, the lifting cylinder is operated at a low operating pressure until the detection pin moves a predetermined amount and the rivet is fed into the specified position, and after the 9° bet is fed, the lifting cylinder is operated at a predetermined operating pressure. , is configured to supply a predetermined pressing force to the stem.

For this reason, until the guide pin is lowered by a predetermined amount by the rivet, the lifting cylinder operates at a low operating pressure and only applies a weak pressing force to the stem, so even if the workpiece position is different, The rivet only touches the workpiece,
The rivet is never compressed. Also, when the guide pin is lowered by a predetermined amount and the rivet is supplied to the predetermined position, the operating pressure of the lifting cylinder is increased, and the lifting cylinder supplies a predetermined pressing force to the stem, and the rivet is placed in the predetermined position. Make it big.

Examples Examples will now be described based on the drawings. Figures 1 to 4
In the figure, 1 is a rivet caulking machine, which has a bracket 3 fixed to a base 2. This bracket 3
A lifting rod 5 that moves up and down together with the stem 4 is slidably guided.

One end of a rotating arm 7 rotatably held by a holder 6 is fixed to the lifting rod 5, and a rod 9 of a lifting cylinder 8 rotatably attached to the bracket 3 is fixed to the other end. are connected. A stopper mounting plate 11 is fixed to the upper end of the lifting rod 5, and a connecting rod 12 is disposed passing through the stopper mounting plate 11. The connecting rod 12 is slidably guided within a stepped hole 13 bored in the bracket 3, and a stopper ring 14 is fixed to the connecting rod 12. The stopper ring 14 is located in the expanded portion 13a of the stepped hole 13, and a first spring 15 is inserted between the stopper ring 14 and the stopper mounting plate 11. This first spring 15 always presses the connecting rod 12 downward.
2 is configured to move up and down together with the lifting rod 5 by means of a locking plate 16 fixed to its upper end. Further, the locking plate 16 comes into contact with a first stopper 17 fixed to the bracket 3, and connects the connecting rod 12 and a fixing plate 18 to be described later.
And the chuck unit 19 is configured to be stopped at that position.

A chuck 19 is rotatably attached to the lower end of the connecting rod 12 via a fixing plate 18.
This chuck unit 19 is provided with a pair of chuck claws 20, 20 whose tips are always biased in a closing direction. This chuck jaw 2o is opposite to the chuck jaw 20.
A holding hole 21 is formed together with the holding hole 21, and the desired rivet 10 is held by this holding hole 21. Further, the chuck unit 19 is always in use so as to be in contact with a second stopper 22 fixed to the bracket 3.
It is biased by a spring 23 so that the holding hole 21 is positioned at a position where it is completely removed from below the stem 4.

Further, a supply pipe 24 is rotatably attached to the bracket 3 close to the holding hole 21 of the chuck jaw 20, and a rivet 10 is supplied by air from a parts supply device (not shown). It is configured to pass through the tube 24 and be held by the chuck claw 20.

An anvil device 25 is arranged corresponding to the stem 4. This anvil device 25 has a pedestal 26 fixed to the base 2, and a guide cylinder 21 is fixed to this pedestal 26. This guide tube 27 has an anvil receiver 2.
8 is housed therein, and the lower end of this anvil holder 28 passes through the holder 26 and is located at a predetermined position on the base 2.

Further, a guide roller 35 is attached to the anvil receiver 28, and the guide roller 35 is arranged to move along a guide groove 36 cut in the guide tube 27. The guide roller 35 is fitted into a sliding groove 38 cut into one end of a rotatable lever 37, and the rotation of the rotary lever 37 moves the anvil receiver 28 within the guide cylinder 2γ. configured to be moved. The rotating lever 31 is fixed to a 20th cylinder 40 of a second cylinder 39 that is rotatably attached to the bracket 3, and is configured such that the rotating lever 37 is rotated by the operation of the second cylinder 39. has been done. Further, a slide holder 41 is arranged close to the guide tube 27, and a slider 42 is arranged on the slide holder 41 so as to be movable in a direction orthogonal to the moving direction of the anvil holder 28. There is. The slide receiver of this slider 42 is connected to the 30th prong 44 of a third cylinder 43 fixed to the stand 41, and when the third cylinder 43 operates, the slider 42 penetrates the guide cylinder 21 and extends below the anvil receiver 28. configured to move to a location.

As shown in FIG. 5, an anvil 29 is fixed to the anvil receiver 28, and a guide pin 30 is arranged on this anvil 29. Further, this guide pin 30 is biased by a third spring 31 and is configured such that its tip protrudes from the anvil 29. Furthermore, a detection pin 32 is disposed below the guide pin 30 in the anvil receiver 28 and is biased upward by a fourth spring 33, and the distance between the guide pin 30 and the guide pin 30 is a predetermined distance. The detection pin 32 is set to move when it reaches the position where it is lowered and stored in the anvil 29. Further, a detection hole 34a is bored in the anvil receiver 28 at a position close to the lower end of the detection pin 32, and a position communicating with the detection hole 34a when the anvil receiver 28 is in the raised position. A detection sensor 34 is arranged at
4a detects the movement of the detection pin 32 and releases the rivet 10.
It constitutes a detection device that detects the presence or absence of.

On the other hand, the lifting cylinder 8 is driven by a drive circuit 46 as shown in FIG. This drive circuit 46 has an air booster 47. This air booster 41 has an air chamber 48 and a hydraulic chamber 49. A piston 50 is disposed in the air chamber 48, and a piston rod 51 that moves together with the piston 50 is disposed protruding from the hydraulic chamber R9. ing. This piston rod 51 is configured to be freely inserted into a pressure increasing part 52 provided in the hydraulic chamber 49, and this pressure increasing part 52 is filled with oil. Further, air is supplied to the air chamber 48 through a first switching valve 53, a first air supply hole 54, and an M2 air supply hole 55 so as to operate the piston 50. on the other hand,
A third air supply hole 56 is provided in the hydraulic chamber 49 at a position where oil does not leak, and air is supplied to the hydraulic chamber 49 via a second switching valve 57. The pressure increasing part 52 of the air booster 47 communicates with the back pressure chamber 8a of the lifting cylinder 8, and operates the lifting cylinder 8 at a low operating pressure equal to the air pressure, and applies a low pressing force to the rod 9. After being supplied, this operating pressure is increased by the pressure increasing part 52 of the first booster 47 to operate the lifting cylinder and supply a predetermined pressing force to the rod 9. Further, the second switching valve 57 is connected to the lifting cylinder 8.
It is configured to switch between supplying and discharging air to the pressure intensifying chamber 8b.

In the above-mentioned rivet caulking machine, before starting work, the operator supplies the workpiece 45 between the stem 4 in the raised position and the anvil 29 in the retracted position within the guide tube 27.

At this time, since the handle 29 is in the retracted position within the guide cylinder 27, the workpiece 45 smoothly reaches the predetermined position. Moreover, there is no possibility that the workpiece 45 collides with the anvil 29, and the workpiece 45 is not damaged at all.

After the workpiece 45 reaches a predetermined position, the second cylinder 39 is activated as shown in FIG. The rotation lever 37 rotates due to the extension of the twentieth arm 40, and the guide roller 35 moves up along the sliding groove 38 and the guide groove 36. At the same time, the anvil receiver 28 also moves up inside the guide tube 21,
The guide pin 30 and anvil 29 reach the predetermined position,
The guide pin 30 is located at a predetermined working position on the workpiece 45. Furthermore, the third cylinder 43 operates, and the slider 42
moves to the lower side of the anvil receiver 28, and the anvil receiver 28
hold.

On the other hand, the desired rivet 10 is delivered to the supply pipe 24 from the component supply device.
The rivet 10 is supplied to the chuck jaw 20 through the chuck jaw 20, and the rivet 10 is securely held in the holding hole 21 of the chuck jaw 20 without reversing its posture. From this state, the second switching valve 57 of the drive circuit 46 of the lifting cylinder 8 is switched to supply air to the hydraulic chamber 49 of the air booster 47. At the same time, the air in the pressure increasing chamber 8b of the lifting cylinder 8 is discharged. Therefore, although the oil in the hydraulic chamber 47 is increased in pressure to the air pressure, the lifting cylinder only operates at a low operating pressure equal to the air pressure, and supplies a low pressing force to the rod 9. As the rod 9 rises, the rotating arm 7 rotates, and the elevating rod 5 descends. At the same time, the connecting rod 12 also moves together, but when the chuck unit 19 descends and separates from the second stopper 22, the chuck unit 19 rotates due to the action of the second spring 23, and the chuck claw 20 forms a The holding hole 21 is moved below the stem 4. After that, the locking plate 16 is moved to the first stopper 1.
1, the connecting rod 12 stops its movement,
The fixing plate 18 and the chuck unit 19 also stop at that position. Further, when the rotating arm 7 rotates, the elevating rod 5 automatically descends. Therefore, the stem 4 comes into contact with the rivet 10 held by the chuck pawl 20, and the rivet 10 is separated from the chuck pawl 20. Along with this,
The rivet 10 contacts the guide pin 30 of the anvil device 25 and lowers the guide pin 30. As the guide pin 30 descends, the rivet 10 is guided into the workpiece 45.

When the guide pin 30 descends, the detection pin 32 located below it also descends as shown in FIG. 8, and its lower end is detected by the detection sensor +j34. This detection sensor 34
detects that the rivet 10 has descended to a predetermined position.

The drive circuit 46 receives the detection signal from the detection sensor 34.
The first switching valve 53 switches, and the piston 50 in the air chamber 48 of the air booster 47 descends. At the same time, the piston rod 51 is also lowered, and its tip is inserted into the pressure increasing part 52 of the hydraulic chamber 49. Therefore, the pressure of the oil in the pressure increasing portion 52 is increased to obtain a predetermined operating pressure.

This operating pressure operates the lifting cylinder 8 and applies a predetermined pressing force to the rod 9. This causes the rod 9 to further rise, causing the rotating arm 7 to rotate, thereby applying a predetermined pressing force to the stem 4. Therefore, this stem 4 reliably caulks the rivet 10 supplied into the workpiece 45 with a predetermined pressing force.

After the caulking work is completed, the third cylinder 43 moves back, the second cylinder 39 moves back, and the 20th cylinder 40 moves backward. Therefore, the rotating lever 37 returns to its rotational position, and the sliding of the rotating lever 37 The moving groove 38 descends, causing the anvil receiver 28 to descend along the guide tube 27. At the same time, the handle 29 also descends, widening the space between the stem 4 and the anvil 29, making it easier to take out the workpiece 45. can be done.

As described in detail, the present invention uses a stem to press the rivet with a low pressing force until the rivet has been fed to a predetermined position, and after the rivet has been fed to the predetermined position, the stem presses the rivet to a predetermined pressure point. Since the configuration is such that the rivet is caulked by pressing with the workpiece, the rivet can be fed to the workpiece with an appropriate pressing force, and not only can the rivet be reliably fed to the specified position, but also if the workpiece is in a different position. Even though
The rivet only comes into contact with the workpiece, there is no compression on the surface of the workpiece, the rivet is not deformed at all, and the workpiece can be stopped at the point where the workpiece is not damaged at all. It has the advantage of being reusable.

[Brief explanation of the drawing]

FIG. 1 is a front view of the main part of the present invention, FIG. 2 is a side view of FIG.
The figure is a sectional view of the main part taken along the E3-B line in Fig. 1, Fig. 5 is an enlarged sectional view of the main part of the present invention, Fig. 6 is a drive circuit diagram of the lifting cylinder according to the present invention, and Fig. 7 8 is an overall explanatory diagram of the operation of the present invention, and FIG. 8 is a detailed explanatory diagram of the present invention. 1 Rivet caulking machine, 2 Base, 3 Bracket, 4 Stem, 5 Elevating rod, 6 Holder, 7 Rotating arm, 8 Elevating cylinder, 8a back pressure chamber,
8b Pressure boosting chamber 9 Lot, 10 Rivet, 11 Stopper mounting plate, 12 Connecting rod, 13 Stepped hole, 13a Expanded part, 14 Stopper ring, 15 First spring, 16 Locking plate, 17 First stopper, 18 Fixed plate, 19 Chuck unit, 20 Chuck claw, 21 Holding hole, 22 Second stopper, 23 Second spring, 24 Supply pipe,
25 anvil device, 26 support stand, 27 guide cylinder, 28 anvil support, 29 anvil, 30 guide pin, 31 third spring, 32 detection pin, 33 fourth spring, 34 detection sensor, 34a detection hole, 35
Guide roller, 36 Guide groove, 37 Rotating lever,
38 sliding groove, 39 second cylinder, 40 20th cylinder, 41 slide support base, 42 slider, 43 third cylinder, 4
4 30th node, 45 workpiece, 46 drive circuit, 47 air booster, 48 air chamber 49 hydraulic chamber, 50 piston, 51 piston rod, 52 pressure increaser, 53 first switching valve, 54 first air supply hole, 55 th 2 air supply hole, 56 3rd air supply hole, 57 2nd switching valve, patent applicant Nitto Seiko Co., Ltd.

Claims (1)

[Claims] In a rivet caulking machine, a reciprocating stem is arranged on a bracket, an anvil is arranged in correspondence with this stem, and a guide pin for guiding a desired rivet is retractably arranged on this anvil.The stem is held by an elevating iron. A rotating arm is connected to this lifting rod, and this rotating arm is configured to be rotated by a cylinder, while a detection pin is arranged so as to be retractable on the movement path of the guide pin, and this detection pin A rivet caulking machine, characterized in that the rivet caulking machine is configured to increase pressure in the cylinder after the cylinder has moved by a predetermined amount.