JPH08197290A - Driving device of press machine - Google Patents

Abstract

PURPOSE: To provide a driving device of a press machine which is assembled easily and can be installed in a small space. CONSTITUTION: In a press machine provided with a driving unit 3 which converts the uniform rotation of a main gear 7 to the nonuniform rotation by the Whitworth mechanism and transmits to the sub crank shaft 8, both ends of the sub crank shafts 8 installed on the driving unit 3 and the end part of right and left crank shafts 11 installed on both sides of the driving shafts 3 are connected directly with a connecting means 12. Since the connection of the sub crank shaft 8 and the crank shaft 11 is executed easily, the assembling work is executed easily. Further, since a coupling is not used, the space in order to install the couplings att both sides of the driving unit 3 is made unnecessary, so it can be installed easily in the small space, and the press body can be also miniaturized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for a press machine that drives a slide up and down.

[0002]

2. Description of the Related Art As a conventional drive device of this type, for example, those disclosed in Japanese Utility Model Publication No. 3-21833, Japanese Patent Publication No. 3-30479, and Japanese Utility Model Publication No. 62-127392 are known. Japanese Utility Model Publication No. 3-21833 discloses a gear unit used in a drive device of a press machine having a quick return mechanism, in which a notch is provided in a unit housing, one end of which is attached to an eccentric pin of the unit housing and the other end of which is provided. The link attached to the eccentric part of the crankshaft can be inserted in the radial direction from this notch,
Since the main gear is attached to the unit housing,
The unit housing and crankshaft can be connected by a link without increasing the diameter of the main gear, and moreover,
The unit housing can be integrated and reduced in size and weight, the gear unit can be easily manufactured and assembled, and the moment of inertia can be reduced.

In Japanese Patent Publication No. 3-30479, a drive shaft provided with a flywheel, a clutch, a brake and a pinion gear in a unit case of a unitized drive unit is concentric with the crank shaft. A sub crankshaft that is separably connected to the lever crank shaft via a coupling, a main gear that has a center at a position eccentric to the sub crank shaft and that meshes with the pinion gear, and a main gear and the sub crank shaft. A plurality of links are provided to connect the eccentric parts, and a plurality of eccentric amounts of the sub-crankshaft and the main gear are provided differently, and the links are exchangeably connected to the crankshaft by the coupling.

In Japanese Utility Model Laid-Open No. 62-127392, a link and an eccentric shaft are provided in the same unit case so that they can be attached to both the eccentric main gear and the link main gear.

[0005]

However, in any of the publications, since the crankshaft and the auxiliary crankshaft of the drive unit are connected via a coupling, the coupling is provided on both sides of the gear unit. However, there is a problem in that the drive device becomes large in size because of the need for the above space, and the width of the press body in the left-right direction becomes large, and the entire press becomes large. Also, if the space on both sides of the drive unit is small, it will be difficult to connect the crankshaft and the auxiliary crankshaft by coupling, and it will take a lot of time to adjust the phase of the crankshafts arranged on the left and right of the drive unit. In addition to being inefficient, the provision of the coupling causes a problem such as a reduction in torsional rigidity between the left and right crankshafts and the sub crankshaft. Further, in the case where the crankshaft and the auxiliary crankshaft are spline-engaged, it is difficult to understand the phase relationship between the left and right at the time of assembly, so that there is a problem that an assembly error easily occurs. The present invention has been made in order to improve such a problem, and an object of the present invention is to provide a drive device for a press machine that does not require a space for providing a coupling and is easy to assemble.

[0006]

In order to achieve the above object, the present invention comprises a drive unit for converting the uniform speed rotation of the main gear into a non-uniform speed rotation by the Whitworth mechanism and transmitting it to the sub crankshaft. In the press machine, the both ends of the auxiliary crank shaft provided in the drive unit and the ends of the left and right crank shafts provided on both sides of the drive unit 3 are
It is directly connected by connecting means. In addition, the connecting means is formed of a fitting hole and a fitting portion for spline fitting with each other, and the fitting hole and the fitting portion are provided with an eccentric portion or a protrusion and a notch that allows fitting only at a fixed position. Is.

[0007]

[Operation] With the above configuration, the work of connecting the auxiliary crank shaft of the drive unit and the crank shaft is facilitated, and there is no space for installing couplings on both sides of the drive unit. The width can be reduced. Further, since the auxiliary crank shaft and the crank shaft can be connected only at a fixed position, an assembly error such as a phase shift between the left and right crank shafts does not occur.

[0008]

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings. 1 is a longitudinal sectional view of the press machine, and FIG. 2 is A of FIG.
-A sectional view taken along the line A, Fig. 3 is an enlarged sectional view of the drive device, and Fig. 4 is a sectional view taken along the line BB in Fig. 3. In these figures, reference numeral 1 denotes a press main body, a crown 1c is provided on an upper part of an upright 1b standing on a bed 1a, and a drive unit 3 for vertically driving a slide 2 is provided in the crown 1c. The drive device 3 is unitized and has a main pinion 6 which is rotated by a main motor 4 via a flywheel 5 in a unit case 3a, and a main gear 7 is meshed with the main pinion 6. .

A center portion of the main gear 7 is rotatably supported by the unit case 3a, and a sub crank 8 is provided at a position eccentric from the center 0 of the main gear 7. Both ends of the auxiliary crank shaft 8 are rotatably supported by the unit case 3a, and the Whitworth mechanism 1 is provided between the auxiliary crank shaft 8 and the main gear 7.
0 is provided. The Whitworth mechanism 10 converts the uniform speed rotation of the main gear 7 into a non-uniform speed rotation and transmits it to the sub crankshaft 8. One end side of the Whitworth mechanism 10 is pivotally attached to the inner peripheral portion of the main gear 7 via a pin 10a. The link 10b has a link 10b, and the other end of the link 10b is provided with a pin 1 at the tip of a lever 8b projecting from the outer peripheral portion of the sub crankshaft 8.
It is pivotally connected via 0c.

On the other hand, both ends of the auxiliary crankshaft 8 are projected on both sides of the unit case 3a, and a pair of crankshafts 11 provided on both sides of the unit case 3a on both end surfaces.
There is formed a connecting means 12 for connecting and connecting the ends of the. The connecting means 12 is a three-stage fitting hole 8a having different diameters into which the end of the crankshaft 11 is fitted, and the innermost surface has a smallest innermost hole 8 ₁ and a spline 8c. Hole 8 ₂ and a large-diameter hole 8 ₃ located on the opening side. The small-diameter hole 8 ₁ and the medium-diameter hole 8 ₂ are coaxial with the center of the auxiliary crankshaft 8, while the large-diameter hole 8 ₃ Is slightly eccentric.

Also, at the end portion on the crankshaft 11 side, a small diameter portion 11 ₁ , a medium diameter portion 11 ₂ and a large diameter portion 11 which are fitted into the small diameter hole 8 ₁ , the medium diameter hole 8 ₂ and the large diameter hole 8 ₃ , respectively. _A fitting portion 11a made of ₃ is formed, and the large diameter portion 11 ₃ is eccentric like the large diameter hole 8 ₃ so that when the end portion of the crankshaft 11 is fitted into the fitting hole 8a. The auxiliary crankshaft 8 can be fitted only when the phases of the left and right crankshafts 11 match each other, thereby preventing an assembly error. On the other hand, an eccentric portion 11b is formed in an intermediate portion of each crankshaft 11 and these eccentric portions 11b are formed.
b, one end of the connecting rod 14 is supported, and the other end of the connecting rod 14 is connected to the slide 2 via the point 15.
Is connected to the upper part of.

Next, the operation of the press machine constructed as described above will be described. When assembling the drive unit, the crown 1c is used.
After mounting the drive unit 3 therein, the end portions of the crankshaft 11 may be fitted from both sides of the drive unit 3 into the fitting holes 8a of the auxiliary crankshaft 8 provided on both sides of the drive unit 3, since it does not use a coupling with assembly work is easy, can not be fitted the eccentric position of the large diameter hole 8 ₃ does not match the large diameter portion 11 ₃ and the fitting hole 8a of the crank shaft 11, the left and right crankshaft It is possible to prevent an assembly error such as a phase shift of 11 in advance.

The operation of the drive device assembled as described above is such that when the main motor 4 rotates the main gear 7 via the main pinion 6, this rotation becomes non-uniform rotation by the Whitworth mechanism 10. After being converted and transmitted to the auxiliary crank shaft 8, and further transmitted to the crank shaft 11, the left and right crank shafts 11 are simultaneously rotated, so that the slide 2 is vertically driven at a non-constant speed via the connecting rod 14. In the above embodiment, the auxiliary crank shaft 8
Side has a fitting hole 12a and the crankshaft 11 side has a fitting portion 1
1a is provided, but of course not the other way around. In the above embodiment, the eccentric portion is provided to prevent the left and right crankshafts 11 from being assembled incorrectly. However, as shown in FIGS. 5A to 5C, a substantially half-moon shaped protrusion 8e is provided on the auxiliary crankshaft 8 side. By providing the half-moon-shaped notch 11e into which the protrusion 8e is fitted on the left and right crankshafts 11 side, it is possible to prevent the left and right crankshafts 11 from being assembled wrongly as in the embodiment having the eccentric portion. .

[0014]

As described in detail above, according to the present invention, both ends of the auxiliary crankshaft provided in the drive unit and the ends of the left and right crankshafts are directly connected to each other through the connecting means. No space is required for providing the couplings on both sides of the drive unit, as compared with the case where the couplings are connected through the couplings. As a result, the width of the press body in the left-right direction can be reduced, so that the entire press can be downsized, and since the assembly work by the coupling is not required, the assembly can be done easily and in a short time compared to the conventional one. By providing an eccentric part or a protrusion and a notch in part of the connecting means so that the auxiliary crank shaft and the crank shaft cannot be connected unless they are in a fixed position, the left and right crank shafts can be assembled in the wrong phase. You can prevent mistakes before they happen. Further, since the coupling is not used, the rigidity of the sub crankshaft and the crankshaft in the twisting direction does not decrease, and the number of connecting portions is reduced, so that stable accuracy can be secured for a long period of time.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a press machine according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged cross-sectional view showing a driving device of a press machine according to an embodiment of the present invention.

4 is a cross-sectional view taken along the line BB of FIG.

FIG. 5A is an explanatory diagram showing another embodiment for determining the phases of the left and right crankshafts. (B) is a view in the direction of the arrow C in (A) of FIG. FIG. 6C is a view in the direction of the arrow D in FIG.

[Explanation of symbols]

 3 ... Drive unit 7 ... Main gear 8 ... Sub crankshaft 8a ... Fitting hole 10 ... Whitworth mechanism 11 ... Crankshaft 11a ... Fitting part 12 ... Connecting means.

Claims (2)

[Claims] 1. A sub-crankshaft 8 by converting the main-speed rotation of a main gear into a non-uniform-speed rotation by a Whitworth mechanism 10.
In the press machine including the drive unit 3 for transmitting to the drive unit 3, both ends of the auxiliary crank shaft 8 provided in the drive unit 3 and end portions of the left and right crank shafts 11 provided on both sides of the drive unit 3 are connected to each other by the connecting means 12. A drive device for a press machine, characterized by being directly connected by. 2. An eccentric part which is formed of a fitting hole 8a and a fitting part 11a for spline fitting with each other, and which allows the fitting means 8a and the fitting part 11a to be fitted only in a fixed position. The drive device for a press machine according to claim 1, further comprising a protrusion 8e and a notch 11e.