JP2560279Y2 - Rivet caulking machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rivet caulking machine used for fastening leather products such as bags and shoes or thin plates.

[0002]

2. Description of the Related Art Conventionally, a rivet caulking machine used for fastening leather products such as bags and shoes or thin plates has a stem shaft guided reciprocally up and down and a stem fixed to the lower end thereof. When the stem is lowered, the rivet held by a pair of chuck pawls which are openly urged and located on the moving path is pushed out from the chuck jaws and caulked.

In this rivet caulking machine, an AC motor is used as a rotary drive source for moving the stem shaft and the stem up and down, and the rotation is transmitted to a rotary plate having a flywheel function via a mechanical clutch. The crankshaft is reciprocated in the horizontal direction with the rotation of the rotary plate, and the stem shaft and the stem are reciprocated up and down via two links connected to one end of the crankshaft.

[0004]

In this rivet caulking machine, when the AC motor is constantly rotated and the work start switch is turned on, the solenoid valve operates, the mechanical clutch operates, and the rotation of the AC motor rotates. Transmitted to the plate. By one rotation of the rotary plate, the crankshaft reciprocates one reciprocally forward while reciprocating, and two links connected to its tip extend in a straight line, thereby lowering the stem shaft together with the stem. With the lowering of the stem shaft, the stem is lowered, and the rivet supplied from the alignment chute and held by the chuck pawl is pushed out from the chuck pawl and pushed into the lower hole of the work, whereby the rivet can be caulked. During this work, the impact sound during operation is tremendous, especially because the mechanical clutch is used to transmit the rotation of the AC motor to the rotating plate, and a quiet riveting machine without impact sound Is required.

The present invention has been made in view of the above-mentioned demands, and aims to provide a quiet rivet setting machine with a small impact sound during rivet setting operation.

[0006]

A bracket consisting of an upper bracket and a lower bracket is fixed to a base, and a stem shaft is guided by the upper bracket so as to be reciprocally movable.
The stem is fixed to the tip of the stem shaft so as to move integrally, and a pair of chuck claws which are located on the movement path of the stem and urged openably are arranged on the upper bracket via a bearing stand. A rotating plate that rotates in response to the rotation of the rotation drive source is provided rotatably about its rotation axis,
One end of the crankshaft is rotatably connected to the rotating plate, two rotatable links are connected to the other end, one end of the stem shaft is connected to the other end of one link, and the other end of the other link. Is rotatably attached to the upper bracket.

In addition, a roll set is disposed below the stem via a work receiving base fixed to the lower bracket.

In addition, a DC motor is used as the rotary drive source, and a detection dog that rotates integrally with the rotary shaft of the rotary plate is fixed, and a sensor for detecting the passage of the detection dog is provided on the bearing stand side. A control unit is provided for driving the voltage supply unit so as to supply an arbitrary voltage to the DC motor by a start switch and rotating the rotary plate once to stop.

[0009]

In the above rivet caulking machine, the DC of the rotary drive source is
When the motor is constantly stopped and the work start switch is turned on, a predetermined voltage is applied to the DC motor, and the DC motor rotates. This rotation is applied to the rotating plate, and the rotating plate rotates with a predetermined torque. With this rotation, the crankshaft advances, the two links connected to its tip extend in a straight line, and the stem shaft descends.
Accordingly, the stem is lowered, and the rivet held by the chuck pawl is pushed into the prepared hole of the work, and can be swaged. Moreover, when the rotation plate makes one rotation, the detection sensor detects the passage of the detection dog, stops driving the DC motor, and completes one caulking operation. During this caulking operation, the rotation of the DC motor is transmitted directly to the rotating plate, so that the generation of impact noise is reduced.

[0010]

Embodiments will be described below with reference to the drawings. 1 to 3, reference numeral 1 denotes a riveting machine, and its base 2 has an upper bracket 3a and a lower bracket 3b.
Is fixed. A stem shaft 4 is guided by the upper bracket 3a so as to be able to reciprocate up and down, and a stem 4a is fixed to the tip of the stem shaft 4 so as to move integrally therewith. The upper bracket 3a is provided with a D
A rotating plate 7 that rotates by receiving the rotation of the C motor 6 has its first rotating shaft 7a as a center, and at a predetermined distance from the rotating plate 7, a cam plate 8 has a first rotating shaft 7a on the same center line as the first rotating shaft 7a. It is provided rotatable about the two rotation shafts 8a. A crankshaft 9 is disposed between the rotating plate 7 and the cam plate 8, one end of which is rotatably connected thereto, and the other end thereof is connected to two rotatable links 10a, 10b. ing. One link 10a
Is connected to the upper bracket 3a and the other link 10
The upper end of the stem shaft 4 is rotatably connected to the other end of the stem b, and the two links 10a and 10b extend in a straight line or bend as the crank shaft 9 moves forward and backward, so that the stem shaft 4 moves up and down. It is configured to move to. Further, a lever mounting portion extending obliquely upward is provided at the upper end of the link 10a, and a shuttle plate which moves across the alignment chute 15 at the lower end to separate the rivets 14 one by one is provided at the lower end of the lever mounting portion. 1
The upper end of the shuttle lever 10c connected to 5a is rotatably connected.

On the other hand, a chuck holding plate 11 is arranged on the upper bracket 3a so as to slide in parallel with the moving direction of the stem shaft 4, and a lower end of the chuck holding plate 11 is provided on a moving path of the stem 4a. And a pair of chuck claws 12 are urged to be openable via a leaf spring 11a. A rivet holding hole (not shown) is formed in the chuck claw 12, and a drum feeder 13 attached to a side surface of the upper bracket 3a is formed.
As a result, the rivets 14 pass through the alignment chute 15 and are supplied to the rivet holding holes one by one. An upper end of the chuck holding plate 11 is rotatably connected to one end of a turning lever 17 that turns around a locking pin 16, and the upper end of the turning lever 17 is connected via a cam follower 17a. The cam plate 8 is constantly urged by the spring 18 so as to follow the cam plate 8. With the rotation of the cam plate 8, the quarter rotation is rotated, the subsequent half rotation is stopped at that position, and the remaining 1 The 回 転 rotation is configured to return to rotation.

Further, a roll set 20 is disposed below the stem 4a via a work receiving base 19 fixed to the lower bracket 3b, and a leg of a rivet 14 pushed out from the chuck pawl 12 by the stem 4a. Is guided to the prepared hole of the work 25.

The rotation of the DC motor 6 is transmitted to a first rotating shaft 7a of the rotating plate 7 via a pulley transmitting mechanism 21 and further to a second rotating shaft 8a integral with the cam plate 8 via a crankshaft 9. And the second rotation shaft 8a
Is provided with a detection dog 22 which rotates integrally, and a detection sensor 23 and an origin sensor 24 which are close to the detection dog 22 and detect the passage therethrough. The origin sensor 24 detects when the crankshaft 9 is at the rearmost position, and the detection sensor 23 detects the crankshaft 9.
Is located so as to detect the detection dog 22 when it is at the slightly forward position. These output signals are output to a control unit (not shown) of a rivet setting machine having a voltage supply unit of the DC motor 6, and this control unit outputs when an operation start switch (not shown) outputs an ON signal. A predetermined voltage is supplied to the DC motor 6 until the detection sensor 23 detects the detection dog 22, and when an ON signal is output from the second work start switch, the voltage supply to the DC motor 6 is restarted. When the origin switch 24 detects the detection dog 22, the voltage supply is stopped.

In the rivet setting machine, the rotating plate 7 and the cam plate 8 are rotated about the first rotating shaft 7a and the second rotating shaft 8a as the DC motor 6 is rotated by the ON signal from the first operation start switch. To rotate. With the rotation of the rotating plate 7 and the cam plate 8, the crankshaft 9 connected thereto advances, and the links 10a and 10b at the ends thereof extend in a straight line. Therefore, the stem shaft 4 starts to descend together with the stem 4a. At the same time, the cam plate 8 rotates, and the rotating lever 17 that comes into contact with the cam plate 8 rotates to lower the chuck holding plate 11 connected to the lower end via the locking pin 16. When the cam plate 8 rotates １ ／, the rotation of the rotation lever 17 stops, and the chuck pawl 12 attached to the chuck holding plate 11 stops near the work held on the work receiving base 19. Thereafter, the detection dog 22
The rotation of the DC motor stops at the position where is detected by the detection sensor 23, but the DC motor 6 is redriven by the ON signal from the second work start switch, and the cam plate 8
The crankshaft 9 moves forward while the further turns 1/4, and the two links 10a and 10b are located on a straight line,
The stem shaft 4 and the stem 4a further descend, and the stem 4
a pushes out the rivet 14 held by the chuck claw 12 from the chuck claw 12. As the guide pin 20a of the roll set 20 retreats, the rivet 14 is guided to the prepared hole of the work 25 as shown in FIG. 4, and the tip reaches the anvil 20b and is caulked.

Thereafter, when the cam plate 8 further rotates 1/4, the crankshaft 9 starts to retreat, and the stem shaft 4 and the stem 4a are raised. Further, the cam plate 8 is 1/4
When rotated, the rotating lever 17 that comes into contact with the cam plate 8 rotates and returns, and the chuck holding plate 11 and the chuck pawl 12
Is raised and returned. The cam plate 8 makes one rotation and the second rotating shaft 8
When a rotates once, the detection dog 22 reaches a position close to the origin sensor 23, the supply of voltage to the DC motor 6 is stopped, and the DC motor 6 stops its rotation. During this time, one rotation of the rotating plate 7 and the cam plate 8 is controlled by turning on and off the DC motor 6, so that the impact noise at the time of braking the rotating plate 7 and the cam plate 8 can be reduced. In addition, since the chuck pawl can be stopped at the intermediate position during one caulking operation, the rivet can be easily positioned.

[0016]

As described above, in the present invention, a DC motor is used as a rotation drive source, and one rotation of the DC motor is detected by a sensor to stop the DC motor every one rotation, and the rotation of the motor is controlled by a crank mechanism. It is configured to move the stem attached to the stem shaft up and down by calibrating the rivet at the predetermined position, so that one rotation from the rotary drive source is mechanical There is an advantage that there is no need to use a clutch and an extremely quiet rivet setting machine can be provided. Further, since the present invention can stop the chuck claw holding the rivet at the intermediate position, the rivet can be positioned at a position close to the work, and there is an advantage that the positioning can be easily performed.

[Brief description of the drawings]

FIG. 1 is a front view of the present invention.

FIG. 2 is an enlarged sectional view of an essential part taken along line AA of FIG.

FIG. 3 is a partially cutaway enlarged plan view showing a state where the rivet setting machine of FIG. 1 is rotated by 90 degrees.

FIG. 4 is an explanatory view of a main part showing a caulking operation according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Riveting machine 2 Base 3 Bracket 3a Upper bracket 3b Lower bracket 4 Stem shaft 4a Stem 5 Bearing stand 6 DC motor 7 Rotating plate 7a 1st rotating shaft 8 Cam plate 8a 2nd rotating shaft 9 Crankshaft 10a, 10b Link 10c Shuttle lever 11 Chuck holding plate 11a Leaf spring 12 Chuck claw 13 Drum feeder 14 Rivets 15 Alignment chute 15a Shuttle plate 16 Lock pin 17 Rotating lever 17a Cam follower 18 Spring 19 Work cradle 20 Roll set 20a Guide pin 20b Anvil 21 Pulley mechanism 22 Detection Dog 23 Detection Sensor 24 Origin Sensor 25 Work

Claims (1)

(57) [Scope of request for utility model registration] 1. A bracket comprising an upper bracket and a lower bracket is fixed to a base, and a stem shaft is guided reciprocally by the upper bracket, and the stem is fixed to a tip of the stem shaft so as to move integrally. A pair of chuck claws, which are positioned on the movement path of the stem and are urged to open freely, are arranged, and the upper bracket is rotated by a rotation plate which is rotated by receiving rotation of a rotation drive source via a bearing base. Provided rotatably around the shaft, one end of the crankshaft is rotatably connected to this rotating plate, two rotatable links are connected to the other end, and the other end of one link is connected to the upper bracket. The other link is rotatably mounted, and the other end of the other link is rotatably connected to one end of a stem shaft, while a work receiving base fixed to the lower bracket below the stem is provided. In a rivet caulking machine equipped with a roll set, a DC motor is used as the rotation drive source, and a detection dog that rotates integrally with the rotating shaft of the rotating plate is fixed, and a sensor that detects the passage of this detection dog is provided on the bearing base side. While providing
A riveting machine, comprising: a control unit for driving a voltage supply unit to supply an arbitrary voltage to the DC motor by a work start switch, and for rotating the rotary plate once to stop.