JPH03317Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention converts the constant speed rotation of the drive shaft into inconstant speed rotation of the crankshaft to generate power in order to make the slide of a press machine perform a quick return motion. The present invention relates to a drive device for a press machine that can perform transmission.

[Prior Art] A link press is widely known as a press machine that causes a slide to perform a quick return motion. This link press uses many links between the drive shaft and the crankshaft, making manufacturing, adjustment, and maintenance complicated.

Therefore, the present applicant has developed a drive device that has a simple structure and is easy to manufacture and maintain.
Disclosed in the issue. As shown in FIG. 4, the configuration is such that a lever 3 extending in the radial direction is provided at the end opposite to the eccentric portion 2A of the crankshaft 2 rotatably supported on the press body 1. A groove 3A in the direction is provided. On the other hand, a pinion 5 is provided on a drive shaft 4 rotatably supported by the machine body 1, and a main gear 6 that meshes with the pinion 5 is eccentrically provided by a distance e from the crankshaft 2 and is rotatably provided on the machine body 1. The side of the main gear 6 facing the lever 3 is supported by the body 1 as a large-diameter bearing 6A, and the opposite side of the bearing 6A is supported by the body 1 via a shaft 6B. An eccentric pin 7 supported by a bearing portion 6A and a main gear 6 is provided to protrude to a length that is inserted into the groove 3A of the lever 3, and a slider 8 rotatably provided on the eccentric pin 7 is slid into the groove 3A of the lever 3. It is movably engaged. Therefore, when the drive shaft 4 is rotated at a constant speed, the main gear 6 is also rotated at a constant speed, and the crankshaft 2 is rotated at an inconstant speed due to the action of the eccentric pin 7 of the main gear 6 and the lever 3. This non-uniform rotation allows a slide (not shown) connected to the eccentric portion 2A by a connecting rod to perform a so-called quick return movement in which the slide descends slowly and rises quickly.

[Problem that the invention attempts to solve]

In the conventional drive device described above, in order to balance the force of the main gear 6, the large-diameter bearing 6A is supported on both sides of the large-diameter bearing 6A and the shaft 6B, and the large-diameter bearing 6A is provided with the eccentric pin 7.
Since the lever 3, the large-diameter bearing part 6A, and the main gear 6 are arranged in series, the structure has an extended dimension in the axial direction and the fuselage structure is complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a press drive device which has a simple structure, a small axial dimension, and which allows the press to be downsized and simplified in structure.

[Means for solving problems]

In this invention, a crankshaft is rotatably supported on a machine body, a fixed boss is fixed to the machine body between a bearing part of this crankshaft and an end protruding from the bearing part of the crankshaft, and this fixed boss A main gear is provided eccentrically and rotatably with respect to the crankshaft, a slider guide member is provided on the protruding end of the crankshaft, a radial groove is provided on the surface of the slider guide member facing the main gear, and a radial groove is provided in the groove. An eccentric pin protruding to the length to be inserted is provided on the main gear, a slider rotatably provided on the eccentric pin is slidably engaged in a groove, a pinion is provided on a drive shaft rotatably supported on the aircraft body, It is constructed by meshing this pinion with a main gear.

[Effect]

In such a configuration, when the drive shaft is rotated, the main gear rotates at a constant speed, and the crankshaft rotates at an inconstant speed due to the action of the eccentric pin of the main gear and the lever. The slide, which is connected to the eccentric portion of the crankshaft by a connecting rod, performs a quick return motion that descends slowly and rises quickly. At this time, the fixed boss required to support the main gear is placed between the slider guide member provided on the protruding end of the crankshaft and the supporting body of the crankshaft, and fixed to the machine body. Since the main gear is rotatably supported, there is no problem in terms of force balance, the axial dimension can be shortened, the press can be downsized, and the machine structure can be simplified.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIGS. 1 and 2, the press body 9
A crankshaft 10 having an eccentric portion 10A is rotatably supported, and a circular shape eccentric downwardly from the crankshaft 10 by a distance e is provided on the rear surface of the bearing portion of the body 9 that supports the rear side of one end of the crankshaft 10. The fixed boss 11 is fixedly installed. A main gear 12 is rotatably provided on the outer periphery of the fixed boss 11, so that the center of rotation of the main gear 12 is also offset from the center of rotation of the crankshaft 10 by a distance e.

A lever 1 as a slider guide member extends in the radial direction at a protruding end 10B at the rear end of the crankshaft 10, which passes through the fixed boss 11 with a slight gap.
Fix 3. Main gear 12 of this lever 13
A groove 1 in the radial direction of the crankshaft 10 on the surface facing the
Provide 3A. The main gear 12 has an eccentric pin 14
is provided to protrude toward the lever 13, and its tip is inserted into the groove 13A of the lever 13. A rotatable slider 15 is provided at the tip of the eccentric pin 14, and this slider 1
5 is slidably engaged with the groove 13A of the lever 13.

A pinion 17 is provided on a drive shaft 16 that is rotatably supported on the body 9, and the pinion 17 and the main gear 12 are engaged with each other. A flywheel 18 is rotatably provided on the drive shaft 16.
A clutch brake (not shown) is provided between the drive shaft 16 and the drive shaft 16, and transmits the rotational force of the flywheel 18 to the drive shaft 16, or releases the transmission to brake and stop the drive shaft. Flywheel 18 is driven by a motor (not shown). A press slide 20 is connected to the eccentric portion 10A of the crankshaft 10 via a connecting rod 19, but since this structure is the same as that of a general press, the detailed structure is omitted.

Next, the operation of this embodiment will be explained.

As shown in FIG. 2, as the drive shaft 16 rotates, the main gear 12 moves through the pinion 17 in an arrow R
rotated in the direction of At this time, when the eccentric part 10A of the crankshaft 10 is located directly above the crankshaft 10 as shown in the figure, that is, when the eccentric part 10A is at the top dead center and the slide 20 is at the upper limit, the The center of the groove 13A of the lever 13 is located at a position further forward than the eccentric part 10A by an angle B in the rotational direction, and when the eccentric part 10A comes directly under the crankshaft 10 from this position, that is, the eccentric part 10A When the slide 20 reaches the bottom dead center and reaches its lower limit, the lever 13 driven by the eccentric pin 14 of the main gear 12 comes to a position rotated 180 degrees around the crankshaft 10 as shown by the dashed line from the solid line position. During this time, the eccentric pin 14 of the main gear 12
rotates by an angle C around the main gear 12, and the eccentric pin 14 rotates by an angle D while the lever 13 further rotates 180 degrees from this chain line position. At this time, as is clear from FIG. 2, since the angle C is larger than the angle D, the crankshaft 10 moves slowly from the top dead center to the bottom dead center with respect to the constant rotation of the main gear 12, and the bottom dead center It is driven as a fast non-uniform rotation from to top dead center. Therefore, the slide 20 of the press performs a quick return movement in which it descends slowly and ascends quickly.

Note that the lever 13 is connected to the eccentric portion 1 of the crankshaft 10.
By making the phase advance by an angle B in the rotational direction from 0A, the eccentric pin 14 of the main gear 12 is moved at a time when the press slide 20 is lowering the press from slightly before the lowering limit to the lowering limit when the press pressure is highest. drives the vicinity of the tip of the lever 13, the driving force is transmitted from the main gear 12 to the lever 13 side when the arm is at its longest, and therefore, the force in the circumferential direction and the length of the arm are Assuming that the torque represented by the product is constant, the force in the circumferential direction is small because the length of the arm is long, and as a result, the driving force of the drive shaft 16 is also small. Further, the size of the corner B is appropriately selected from 0 to 45 degrees depending on the type of press working.

FIG. 3 shows the slide 2 of the press with respect to the rotation angle of the main gear 12 of the press configured as described above.
An excursion (stroke) of 0, velocity and acceleration are shown, and while the slide 20 is lowered, the main gear 1
2 has rotated approximately 215 degrees, while the main gear 12 has rotated approximately (360-215) = 145 degrees while the slide 20 is rising, indicating a rapid return movement.

[Effect of idea]

As is clear from the above description, according to the present invention, the axial dimension of the crankshaft can be shortened due to the arrangement of the lever as a slider guide member and the main gear, and the press can be downsized.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional side view of the main parts of a press showing an embodiment of the present invention, Fig. 2 is a view of the main parts as seen from the arrow in Fig. 1, and Fig. 3 shows the stroke (displacement) of the slide relative to the rotation angle of the main gear. ), velocity and acceleration diagrams, and FIG. 4 is a vertical cross-sectional side view of the main parts of a press according to a conventional example. 9... Airframe, 10... Crankshaft, 10A...
Eccentric part, 10B... Projecting end, 11... Fixed boss, 12... Main gear, 13... Lever as slider guide member, 13A... Groove, 14... Eccentric pin, 15... Slider, 16 ...Drive shaft, 17...
...Pinion, 18...Flywheel, 19...
Connecting rod, 20...slide.

Claims (1)

[Scope of utility model registration request] In a drive device that transmits power from a drive shaft of a press machine to a crankshaft, the crankshaft is rotatably supported on the body of the press, and a slider guide member is provided at the end of the crankshaft that protrudes from the bearing portion of the body. is fixed, a fixed boss through which the protruding end of the crankshaft passes is arranged between the slide guide member and the machine body supporting the crankshaft, and is fixed to the machine frame, and a press is attached to this fixed boss. A main gear meshing with a pinion of a drive shaft is rotatably eccentric to the crankshaft, and a groove in the radial direction of the crankshaft is provided on a surface of the slider guide member facing the main gear, and a groove is provided in the radial direction of the crankshaft to face the slider guide member of the main gear. An eccentric pin whose tip is inserted into the groove is provided protrudingly on the side surface thereof, and a slider is provided on the eccentric pin so as to be rotatable and slidably engage with the groove. A press drive device characterized in that the phase of the eccentric part of the shaft is shifted by a certain angle from the eccentric direction.