JPH0341918Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a stop position correction device that can accurately position the stop position of a slide in a press machine.

(Prior Art) In press machines, it is important to accurately stop the slide at predetermined positions such as crank angles of 0° (top dead center) and 180° (bottom dead center).
If the press is a transfer press, the operating position of the feed bar is determined in relation to the position of the slide, and even if the slide drive device has a quick return mechanism, the stop position of the slide is determined in relation to the position of the slide. It is necessary to set it accurately.

Press brakes are used to ensure reliable and safe operation of the press, and failure of the brakes can lead to serious accidents. Although an emergency stop device for a press that operates as an emergency stop device is conventionally known, a device for correcting the stop position of the slide has not been developed.

The slide stroke variable device developed by the inventor of this application and proposed in Utility Application No. 1983-10002 has an eccentric sheave between an eccentric shaft formed on the crankshaft and a connecting rod attached to the outside of the eccentric shaft. arranging each member so that the eccentric sheave is eccentric downward when the crankshaft is at the bottom dead center,
In this state, a cylinder is provided that passes through the eccentric shaft, the eccentric sheave, and the connecting rod, and a lock pin is slidably housed in the cylinder, and the lock pin connects the eccentric shaft and the eccentric sheave at the upper limit position.
This is characterized in that the eccentric sheave and the connecting rod are operated to connect at the lower limit position.

In the above device, the position of the lock pin for changing the stroke of the slide is determined by the crank angle.
Since it is installed so that it can slide only at 180 degrees, variable operation of the slide stroke must stop the slide accurately at a crank angle of 180 degrees.

Here you can set the exact stop position of the slide.
This is why it is desirable to have a device that corrects the slide so that it stays in place when it does not stop at the desired position.

(Problem to be Solved by the Invention) The problem to be solved by the present invention is to provide a stop position correction device that accurately stops a slide at a preset stop position.

(Means for solving the problem) The means for solving the problem in this invention are as follows:
A crankshaft that drives the slide up and down via a connecting rod, a main gear provided on the crankshaft, two abutment blocks provided on the periphery of the main gear, and a corresponding abutment block. an air cylinder that engages with the abutting block when the piston rod provided on the crown is extended and operates to apply rotational force in opposite directions to the main gear; The present invention is characterized in that the slide assumes a specific crank angle when the piston rod engages with the abutment block of the main gear at the same time.

(Function) When the press is normally operated, the piston rod 21 of the air cylinder 20 for stop position correction is moved backward to prevent the abutment block 22 of the main gear 6 from coming into contact with the piston rod 21.

To stop the press at a desired stop position such as bottom dead center, after stopping the press at a predetermined position, loosen the brake and supply air to the air cylinder 20 to protrude the piston rod 21. Abutment block 22 of gear 6
engage with. This causes the press slide 5 to stop accurately at the set position.

(Example) The example is a press machine in which a quick return mechanism is incorporated in the slide drive device, and FIG. 1 is a side view of the correction device, FIG. 2 is a front view of the same, and FIG. 3 is the same as FIG. 1A.
- It is a sectional view of the main gear cut in the A direction.

In these figures, a crankshaft 2 is mounted on the crown 1 of the press, and connecting rods 4, 4 are connected to eccentric portions 3, 3 formed on the crankshaft 2. The embodiment is a double crank press, in which a slide 5 is connected to two connecting rods 4, 4, and the rotation of the crankshaft 2 drives the slide 5 via the connecting rods 4, 4. It is becoming more and more common.

The correction device of the present invention is provided in the central portion of the crankshaft 2, that is, between the two eccentric portions 3, 3. A main gear 6 is provided between the eccentric parts 3, 3, and a drive pinion 8 provided on a drive shaft 7 is meshed with the main gear 6. Further, the main gear 6 is formed in a hollow structure, and a quick return mechanism 9 for sliding is provided inside. The quick return mechanism 9 has a link 11 connected by pins 12 and 13 between an eccentric structure 10 provided at the center of the main gear 6 and an eccentric position near the periphery of the main gear 6,
When the main gear 6 rotates due to the rotation of the drive pinion 8, the crankshaft 2 gives the slide 5 a quick return vertical motion.

Further, the drive shaft 7 of the drive pinion 8 is provided with a clutch unit 14 including a flywheel at one end of the shaft protruding from the unit case, and a brake unit 15 at the other end of the shaft. It is provided for mechanical drive.

By the way, referring to FIG. 3, the main gear 6 is
It is made by joining two split bowl-shaped members 61, 61, and the teeth 62, 62 are connected to the bowl-shaped members 61, 61.
It is not formed in the joint portion where the two are joined, and an annular valley portion 63 is formed in that portion. In addition,
As shown in FIG.
A series of teeth 81, 81 are formed.

Next, the stop position correction device will be explained. Air cylinders 20 , 20 are provided on the crown 1 at positions perpendicular to the axis of the rotational shaft of the main gear 6 and adjacent to the outer diameter portion of the main gear 6 , and are arranged toward the trough 63 of the main gear 6 . protruding piston rod 21,
21 can engage with abutment blocks 22, 22 provided in the valley portion 63 of the main gear 6 with a phase of 180°. As described above, the main gear 6 has tooth parts 62, 62 and is formed of two parts, and the joint part is a valley part 63, so the abutment block 22 is attached to the main gear 6. It is fixed to the trough 63 with set screws 23, 23.

Furthermore, when the piston rods 21, 21 of the air cylinders 20, 20 protrude for the longest time (cylinder end), the piston rods 21, 21 touch the abutment blocks 22, 22.
engages with the main gear 6 to rotate the crankshaft 2 at a specific angle,
For example, set the length to match the bottom dead center angle.
However, it is necessary that the piston rods 21, 21 move away from the main gear so that the main gear 6 can rotate when the rods are moved backward.

24 is an air supply pipe connected to the air cylinders 20, 20, 25 is a solenoid valve for controlling air supply, and 26 is an air supply source.

The embodiment has the above structure, and when the press is operated normally, the air cylinder 2 for correcting the stop position is used.
The piston rods 21, 21 of 0 and 20 are moved backward so that the abutment blocks 22, 22 of the main gear 6 do not come into contact with the piston rods 21, 21 during operation.

Next, in order to stop the press at a desired stop position such as bottom dead center, the slide is stopped at a predetermined position by the clutch of the clutch unit 14 and the brake of the brake unit 15, and then the brake is released.
Next, operate the solenoid valve 25 to open the air cylinder 20,
20 and piston rods 21, 21.
is projected, and both rods abut against the main gear 6 and engage with the blocks 22, 22. In this case, if the main gear 6 has not reached the stop position or is overrunning, one of the piston rods 21, 21 will first come into contact with one of the abutment blocks 22, 22, and then By slightly rotating the main gear 6, both piston rods 2
1 and 21 are both engaged with the abutment blocks 22 and 22, and when this engagement state is secured, the slide 5
becomes a preset stopping position.

Therefore, as described above, the air cylinders 20, 2
The piston rods 21 and 21 of 0 are simultaneously connected to the main gear 6.
The brake can be operated at the position where it engages with the abutment blocks 22, 22, and the press can be stopped at a predetermined position.

(Effects of the invention) The present invention provides two abutment blocks on the periphery of the main gear that rotates together with the crankshaft, and air cylinders corresponding to the abutment blocks, and extends the piston rod of each air cylinder to prevent the abutment from the abutment. By engaging with the stop block, the press can be stopped at a preset crank angle.

[Brief explanation of drawings]

FIG. 1 is a side view of a press crown showing the stop position correction device of the present invention, FIG. 2 is a front view of the same, and FIG. 3 is a sectional view of the main gear taken along line A-A in FIG. 1. . 1...Crown, 2...Crankshaft, 3...Eccentric part,
4... Connecting rod, 5... Slide, 6... Main gear, 7... Drive shaft, 8... Drive pinion, 9... Quick return mechanism, 10... Eccentric structure, 11... Link, 12,
13... Pin, 14... Clutch unit, 15... Brake unit, 20... Air cylinder, 21... Piston rod, 22... Butt block, 23... Set screw, 24... Air supply pipe, 25... Solenoid valve, 26...
Supply source, 61... Bowl-shaped member, 62... Teeth, 63... Trough, 81... Teeth.

Claims (1)

[Scope of utility model registration request] A crankshaft that drives the slide up and down via a connecting rod, a main gear provided on the crankshaft, two abutment blocks provided on the periphery of the main gear, and a corresponding abutment block. an air cylinder provided on the crown that engages with the abutment block when the piston rod is extended and operates to apply rotational force in opposite directions to the main gear; A stop position correcting device for a slide in a press machine, characterized in that the slide assumes a specific crank angle when the two gears simultaneously engage with the abutment blocks of the main gear.