JPS6145985Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a crank press device that presses a workpiece by drawing or shearing, and particularly relates to a stroke adjustment device in this crank press device.

This type of crank press equipment that has already been proposed has a crankshaft mounted horizontally on a machine frame that is gate-shaped and equipped with a lower mold, and a connecting rod is mounted on this crankshaft. This cooking rod is provided with a slide member equipped with an upper mold.

Therefore, each rotation of the crankshaft of the crank press device causes the slide member to slide back and forth once, thereby moving the material on the lower mold to the upper and lower molds in a cooperative press. It is designed to be shaped into a predetermined workpiece shape by action.

However, the above-mentioned crank press apparatus is designed to form a workpiece by reciprocating the slide member once every rotation of the crankshaft with a fixed stroke (stroke). Similarly to pressing thick plates, the slide member must be slid back and forth with a constant stroke, which increases the press operating time and makes it difficult to press different thicknesses. Machining without waste in short operating time,
It is difficult to achieve labor savings through mass production.

On the other hand, with the above-mentioned crank press device, it is possible to keep the stroke constant and install a transmission on the drive motor to increase the stroke speed, but this would require a new transmission. , it becomes expensive.

Furthermore, various types of crank press devices have been proposed in which the stroke of the sliding member is varied by a connecting rod fitted to the crankshaft, but these devices are not only complicated in structure and troublesome to maintain and inspect, but also difficult to handle. Incorporating this mechanism into a large crank press as it is has disadvantages such as the weight of the constituent members becoming heavy and the need for a plurality of workers.

In order to solve the above-mentioned difficulties, the present invention has a drive shaft equipped with a brake device installed in the middle of the machine frame equipped with the cradle of the lower mold, and the drive shaft rotates in opposite directions. A pair of flywheels are loosely mounted on the shaft, and a pair of clutches that operate alternately are provided on the drive shaft located on one side of both flywheels,
A crankshaft is mounted on the machine frame below the drive shaft, a large gear is mounted on one end of the crankshaft so as to mesh with a small gear on the drive shaft, and a connecting rod is fitted on the crankshaft. A slide member integral with the connecting rod and equipped with an upper mold is provided so as to be slidable with respect to the machine frame, a cam member is attached to the other end of the crankshaft or the slide member, and this A plurality of switches for operating the two clutches are arranged on the machine frame located on the path of the cam member, thereby simplifying the handling operation and freely adjusting the stroke of the slide member. The present invention provides a crank press device whose purpose is to mass-produce press processing.

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

In FIGS. 1 to 6 A and B, the code 1 is
The machine frame is equipped with a pedestal 3 for a lower mold 2a, and an electric motor 4 is mounted on the top plate 1a of the machine frame 1, and a bevel gear 5 is mounted on an output shaft 4a of the electric motor 4. has been done. A pair of transmission shafts 6 are rotatably mounted in the machine frame 1 where the bevel gear 5 is located, and each transmission shaft 6 has a bevel gear 7, 8 at its inner end. It is shaft mounted so as to mesh with the bevel gear 5. Furthermore, each V pulley (V groove wheel) 9, 10 is firmly mounted on both outer ends of each transmission shaft 6, and each V pulley is attached to each V belt on each flywheel 15, 16 (described later). 11,12
connected by.

On the other hand, a brake device 13 is located in the middle of the machine frame 1.
A drive shaft 14 having a drive shaft 14 is rotatably mounted horizontally, and a pair of flywheels 15 and 16 are loosely mounted at both ends of the drive shaft 14.
Further, a pair of clutches 17 and 18 are provided at both ends of the drive shaft 14 located outside the flywheels 15 and 16 so as to be able to operate alternately. , 18 are adapted to transmit the power of the flywheels 15, 16 to the drive shaft 14 alternately, and can be rotated in the forward or reverse direction.

Therefore, when the electric motor 4 is driven, the bevel gear 5 of the output shaft 4a of the electric motor 4 rotates with the bevel gears 7 and 8 meshing with it in opposite directions. The transmission shaft 6 next to the bevel gear 7 is connected to the flywheel 15 via the V pulley 9 and the V belt 11.
, and this flywheel 15 is connected to the clutch 17.
The drive shaft 14 is rotated in the forward direction by the operation of the drive shaft 14.

On the other hand, the transmission shaft 6 next to the bevel gear 8 is connected to the flywheel 1 via a V pulley 10 and a V belt 12.
6 is rotated, but since the clutch 18 is idle, no rotational force is transmitted to the drive shaft 14. On the other hand, when the clutch 17 is released, the clutches 18 are activated alternately to transmit the rotational force of the flywheel 16 rotating in the opposite direction to the flywheel 15 to the drive shaft 14. There is.

Further, a crankshaft 19 is rotatably mounted on the machine frame 1 located below the drive shaft 14.
A large gear 20 is provided at one end of the crankshaft 19 so as to mesh with a small gear 21 mounted on the drive shaft 14 . Furthermore, a connecting rod 22 is fitted to the crankshaft 19,
A slide member 23 having an upper mold 2b is provided at the lower end of the connecting rod 22 so as to be slidable along a guide member 24 provided on the machine frame 1.

On the other hand, a cam member 25 is attached to the other end of the crankshaft 19, and the machine frame 1 located in the rotation path of the cam member 25 has the following components, as shown enlarged in FIG. A plurality of switches (micro switches in this case) 26a, 26b, 26c, 2
6d, 26e, 26f, and 26g are arranged concentrically. Further, each of these switches is capable of switching the clutches 17 and 18 alternately.

The operation of the present invention will be explained below.

Now, install the lower mold 2a on the pedestal 3 of the machine frame 1,
The upper mold 2b is attached to the slide member 23 located directly above the lower mold 2a, and a material (workpiece) made of, for example, a metal plate is placed on the lower mold 2a.

On the other hand, by energizing the electric motor 4, the drive shaft 14 can be rotated in the forward direction by actuating the clutch 17 as described above.

Next, as shown in FIGS. 3 and 4A and 4B, both switches 26b and 26g are connected to an electric circuit (not shown) so as to be energized, and each of the remaining switches 26a , 26c, 26d, 26
e and 26f are turned off. In this way,
When the drive shaft 14 rotates forward, this drive shaft 14
Since the small gear 21 rotates the large gear 20 that meshes with it, the crankshaft 19 on which the large gear 20 is mounted rotates through the connecting rod 22 to the slide member 23.
is lowered, and the upper die 2b of this slide member 23 engages with the lower die 2a on the pedestal 3 via the material to press. That is, as shown in FIGS. 4A and 4B, the slide member 23 is pressed down by a stroke _L2 .

When the crankshaft 19 passes the bottom dead center (lowest point), the crankshaft 19 further rotates in the forward direction, so that the slide member 23 moves back and rises. On the other hand, when the cam member 25 of the crankshaft 19 also rotates and comes into contact with the switch 26g, the switch 26g releases the operation of the clutch 17, and at the same time the brake device 13 stops the rotation of the drive shaft 14. Here, the upper and lower molds 2a, 2
The workpiece formed in step b is taken out.

Next, the switch 26g is connected to the clutch 18.
When the drive shaft 14 is operated, the drive shaft 14 rotates in the opposite direction, and the small gear 21 of the drive shaft 14 rotates the large gear 20 in the opposite direction. The slide member 23 is lowered to press the material that has been previously interposed between the upper and lower molds 2a and 2b.

In this way, while the crankshaft 19 makes one reciprocation, the slide member 23 makes two reciprocations and press-forms two materials.

On the other hand, as shown in FIGS. 5A and 5B, the pair of switches 26c and 26f are turned on and connected, and the remaining switches 26a and 26f are connected.
By turning off the strokes b, 26d, 26e, and 26g, the stroke becomes _L3 , which can be adjusted to be shorter than the stroke _L2 in FIGS. 4A and 4B described above.

Therefore, the slide member 23 slides up and down by a short stroke _L3 to press-form the material.

Furthermore, as shown in FIGS. 6A and 6B, the pair of switches 26d and 26e are turned on and connected, and the remaining switches 26a and 26e are connected.
By setting 6b, 26c, 26f, and 26g to the off state, the stroke of the slide member 23 is reduced.
This is L ₄ , which is the shortest stroke.

Incidentally, one rotation of the crankshaft 19 corresponds to a maximum stroke _L1 , and only the switch 26a is operated.

Incidentally, in the embodiment described above, a plurality of switches 26
Although a specific example using a, 26b, 26c, . . . 26g has been described, the design may be changed to use other detectors (sensors).

It is also possible to arrange the above-mentioned switches in a row on the guide member 24 as shown in FIG. 2 and change the design so that they can be operated by a part of the slide member 23.

As described above, according to the present invention, the lower mold 2a
A drive shaft 14 having a brake device 13 is mounted in the middle of the machine frame 1 equipped with a cradle 3.
A pair of flywheels 15 and 16 rotating in opposite directions are loosely mounted on the shaft of the flywheel 1.
A pair of clutches 17 and 18 are provided on the drive shaft 14 located on one side of the drive shaft 14 so as to operate alternately, and a crankshaft 19 is mounted on the machine frame 1 below the drive shaft 14. , a large gear 20 is attached to one end of this crankshaft 19, and a small gear 2 of the drive shaft 14 is attached to one end of the crankshaft 19.
1, a connecting rod 22 is fitted onto the crankshaft 19, and a slide member 23 that is integral with the connecting rod 22 and provided on the upper mold 2b is attached to the machine frame 1. A cam member 25 is attached to the other end of the crankshaft 19 or the slide member 23, and the clutches 17 and 18 are actuated on the machine frame 1 located on the path of the cam member 25. multiple switches 2
6a, 26b, 26c, 26d, 26e, 26
f and 26g, it is not only possible to easily adjust the stroke of the slide member 23, but it is also easy to handle and operate, and the structure is simple, so it can be provided at low cost and requires less maintenance. It has excellent effects such as easy inspection.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the crank press device according to the present invention, Fig. 2 is a cross-sectional view of the same as above, Fig. 3 is an enlarged side view showing the main parts of the invention, Fig. 4 A, B to Fig. 6 A, B 1A and 1B are diagrams for explaining the operation of the present invention. DESCRIPTION OF SYMBOLS 1... Machine frame, 3... Cradle, 13... Brake device, 14... Drive shaft, 15, 16... Flywheel, 17, 18... Clutch, 19... Crankshaft, 22... Conrod, 23 ...Slide member, 25...Cam member, 26a, 26b, 26
c, 26d, 26e, 26f, 26g...switch.

Claims (1)

[Scope of utility model registration request] A drive shaft with a brake device is mounted in the middle of the machine frame equipped with a cradle for the lower mold, and a pair of flywheels that rotate in opposite directions are loosely mounted on this drive shaft. a pair of alternately actuated clutches are provided on the drive shaft located on one side of the wheel;
A crankshaft is mounted on the machine frame below the drive shaft, a large gear is mounted on one end of the crankshaft so as to mesh with a small gear on the drive shaft, and a connecting rod is fitted on the crankshaft. A slide member integral with the connecting rod and equipped with an upper mold is provided so as to be slidable with respect to the machine frame, a cam member is attached to the other end of the crankshaft or the slide member, and this A crank press device characterized in that a plurality of switches for operating the two clutches are disposed in the machine frame located in the passage of the cam member.