JPS6030988Y2 - Automatic conveyance device for press work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an automatic conveyance device for automatically transporting press work into and out of a press machine.

In the past, various improvements have been made to this type of conveying device, including a mechanism that uses a clamping mechanism and a pair of arms pivoted to each other at one end to make the speed characteristics of the press work carriage a perfect sine curve. However, there is a shock when passing the halfway point, the operation lacks smoothness when stopped midway, there is left-right imbalance, and the shock is received at a very limited part of the mechanism when starting and stopping. Therefore, it had shortcomings such as short life.

The purpose of this invention is to solve the problems associated with the above-mentioned conventional technology,
It is an object of the present invention to provide an even better automatic conveyance device for press work.

In order to achieve the above object, the automatic transfer device for press work according to the present invention is provided with a pair of operating arms symmetrically on the left and right sides of a transmission device using a silent chain located in the center, and each arm pivoted on a carriage is connected to a sprocket. It is characterized by a silent chain that forcibly rotates as it moves, so that it can smoothly cross the intermediate point, and can also smoothly stop and start midway.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows the entire automatic conveyance device according to the present invention, in which 1 is a main shaft, and the main shaft transmits the swinging motion of a crank mechanism 4 operated by a motor 2 through a reducer 3. It is configured to be received through the device and rotated back and forth through approximately half a rotation.

As shown in Fig. 2, the transmission device consists of a sprocket 6 provided by a shaft between a pair of frames 5, 5 provided at the center of the hoop, a sprocket 7 fixed at the center of the main shaft 1, and a sprocket 7 fixed at the center of the main shaft 1, It is hanging from the silent chain 8.

Hypochain (HY-VO Chain) (trade name) is preferably used as this silent chain.

The sprocket 6 is connected to the clamping mechanism 4 by a connecting rod 9.

The main shaft 1 is supported at the end of the frame 5.

At both ends of the main shaft 1 there are first arms 10.10 perpendicular to the main shaft.
One end is fixed, and one end of a second arm 12 is pivotally fixed to the other end or tip of each arm 10 via a short shaft 11.

Arms 10 and 12 are thus arranged symmetrically on either side of the central frame.

Note that it is preferable that arm 10 and arm 12 have the same length.

Although the short shaft 11 and the tip of the arm 10 are rotatable relative to each other, the short shaft 11 and the arm 12 are fixed.

The other end of each arm 12 is connected to the carriage 13 by being pivotally fixed to a mounting portion 13' of the carriage 13.

The carriage is normally reciprocated horizontally by means of rollers at the four corners and elongated guide plates 20 disposed on both sides, the surface of which is equipped with suction cups or grippers (not shown), thereby controlling the press work. is now supported.

Further, sprockets 14 are provided on both sides of the main shaft 1 so as to be rotatable relative to the main shaft, and each sprocket 14 is fixed to the frame 5.

The sprockets 15 for the sprockets 14 are each fixed to the short shaft 11, and a silent chain 16 is hung between the sprockets 14 and 15.

The rotation of the main shaft 1 and the inclination of the arm 12 are made proportional to each other.

During operation, the motor 2 reciprocates the sprocket 6 via the crank mechanism 4, and the chain 8 reciprocates the main shaft 1 over approximately 180 degrees.

As the main shaft 1 rotates, the arms 10 on both sides thereof rotate around the main shaft 1.

The short axis 11 moves along an arcuate trajectory, and the arm 12
swings about the short axis 11, and the tip of the arm 12, and therefore the carriage 13, moves linearly and reciprocally.

Further, as the arm 10 rotates, the position where the chain 16 engages with the sprocket 14, 15 is shifted, and the arm 12 is rotated about the short shaft 11.

Then, for a half cycle from one end of the crank mechanism 4 to the other end, the arm 10 and the arm 12 are connected as shown in FIG.
from a state A in which they coincide in one direction, through an intermediate state A' in which they are both upright, to a state A'' in which they coincide in the opposite direction.

In the other half cycle, the arm moves in the reverse order of A''-A'-A.

Therefore, according to the present invention, all the thrust due to inertia when stopping at the end of the stroke is received by the main shaft 1, and is not transmitted to the transmission system beyond that, so there is no effect such as backlash, and the stopping position is fixed. Be extremely accurate.

In addition, the crank mechanism and the mechanism including the first arm and the second arm can obtain desirable speed characteristics by combining sine curves, and furthermore, the first arm and the second arm are placed in the same direction at the end of the stroke. This is a speed characteristic that includes the base of the sine curve.

Furthermore, in this type of device, each arm is vertical and causes an impact when passing through the intermediate position of the stroke, but in the present invention, the second arm is forcibly rotated by a silent chain, so this is not the case. There is almost no impact, and even if the stroke is stopped mid-stroke, the sprocket and chain absorb some of the impact due to inertia, and when starting, they cooperate with the rotation of the second arm, so it starts smoothly.

Moreover, since each pair of arms is symmetrically arranged on both sides of the central transmission, the left and right balance is good.

In addition, with the configuration of this invention, a brake can also be attached to the main shaft, and if this is done, it will be superior in terms of braking.

In addition, since a silent chain system is used as the transmission device between the crank mechanism and the main shaft, unlike the conventional sector gear type, which has point contact between teeth, the sprocket and chain have a wide contact area, making various Because it is subjected to impact, its durability is increased.

Note that there is no backlash because a silent chain is used.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of an automatic transfer device for press work according to an example of the present invention, and FIG. 2 is a slightly diagrammatic front view.
FIG. 3 is a side view showing the operating state. In the figure, 1...Main shaft, 4...Crank mechanism, 5...Frame, 9...Connecting rod,
6,7... Sprocket 8 **e*e* Silent chain, 10... First arm, 1
1...Short axis, 12...Second arm,
13... Carriage, 14... First sprocket, 15... Second sprocket,
16...Silent chain.

Claims (1)

[Claims for Utility Model Registration] Includes a presswork carriage that is reciprocatably supported by a guide plate, and that is oscillated by a clamp mechanism via a transmission device provided between a pair of frames in the center. The transmission device includes a main shaft that is rotated back and forth approximately half a rotation, and the transmission device includes a sprocket connected to the crank mechanism by a connecting rod, a sprocket fixed approximately at the center of the main shaft, and a silent chain suspended between the sprockets. and a first arm fixed to both ends of the main shaft, one end fixed to a short shaft rotatably provided at the tip of each first arm, and the other end pivoted to the carriage. a second arm, a first sprocket provided at both ends of the main shaft so as to be rotatable relative to the main shaft and fixed to the frame, a second sprocket fixed to each of the short shafts; An automatic transfer device for press work, including a silent chain suspended between first and second sprockets.