JPH0731942Y2 - Driving force transmission device for automatic assembly machine - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is an automatic assembly in which the rotational force of a cam rotated by a drive source is transmitted to a tool such as press-fitting / transporting / assembling via a lever, a rod or the like. The present invention relates to a driving force transmission device of a machine.

(Prior Art) FIGS. 5 and 6 show a conventional device. A table is fixed to the upper surface of the frame, a plate is fixed to the table below the table by bolts or welding, and a cam shaft having a cam plate fixed to the middle portion of the plate is rotatably provided at right angles to the plate. ing. A first lever support member is fixed to the plate downward by a cam plate, and a pin is fixed to the tip of the support member. The first lever is supported by the pin so that the first lever can rotate about the pin.
In addition, the other end of the first lever is a first lever located below the table.
One end of the rod is rotatably supported and the other end is the second
It is rotatably supported on one end of the lever. The other end of the second lever is rotatably supported by one end of a second rod located above the table.

The middle portion of the second lever is rotatably supported around a pin of a support member fixed to the table.
A cam follower that is constantly urged against the cam surface of the cam is provided in the middle portion of the first lever. Further, in order to constantly urge the cam surface and the cam follower, the tip of the first lever is pulled by a spring toward the frame.

Next, in operation, when the cam drive source (not shown) rotates, the cam starts to rotate. Since the cam surface and the cam follower are constantly urged by the spring, the first lever swings left and right along the cam surface with the pin as a fulcrum. Since the end of the first lever opposite to the side supported by the pin is connected to the end of the first rod, the first rod moves substantially horizontally to the left and right. Further, the end of the first rod opposite to the side supported by the first lever is connected to the second lever,
Moreover, since the intermediate portion of the second lever is rotatably supported around the pin of the support member, it swings to the left and right as the first rod moves. Furthermore, since the other end of the second lever is connected to the end of the second rod, the second rod also swings left and right about the pin. At the other end of the second rod, for example, a tool station for reciprocating work, such as press-fitting, carrying, and assembling, is arranged.

In other words, the first lever, the first rod, the second lever, and the second rod are sequentially bound together to form a parallelogram link,
The drive is activated by the rotation of the cam.

(Problems to be Solved by the Invention) In the above-mentioned conventional technique, since the cam follower is constantly urged to the cam surface, the spring having a force in the contracting direction is arranged in the vicinity of the table inside the frame. When one end of the spring was hooked on the link and the other end was hooked on the frame during assembly, it was necessary to extend the spring in a narrow space and hook each end. Further, in the automatic assembling and press-fitting apparatus having a plurality of the mechanisms, there is a problem that a plurality of types of springs suitable for each mechanism must be prepared.

Even if the work is not in the tool station or the work is tilted, the levers and links operate normally, damaging the tool station and the work.

(Means for Solving the Problems) The present invention is intended to solve the above problems, and the rotational force of a cam rotated by a drive source is transmitted via a plurality of swinging levers and a rod connecting the plurality of levers. In a driving force transmission device of an automatic assembly machine that transmits to a tool such as press fitting, conveyance, and assembly, a cam follower is attached to the intermediate part of the lever that comes into contact with the cam, and a fluid cylinder is connected to one end of the lever. A stopper mechanism for urging the cam follower to the cam by the pressure of the fluid cylinder and engaging with the lever and stopping the lever at a position apart from the cam when a work abnormality is detected. It is a thing.

(Operation) In the present invention, the cam follower is biased by the pressure of the air cylinder on the cam surface of the cam rotated by the drive source.

(Embodiment) FIGS. 1 and 2 show a first embodiment of the present invention, in which a table 2 is fixed to the upper surface of a frame 1. A plate 3 is fixed below the table 2, and a cam shaft 5 connected to a cam drive source having a cam 4 fixed to the middle of the plate is provided rotatably in a direction perpendicular to the plate 3. A support member 7 of the first lever 6 is fixed below the plate 3, and a part of a cylinder of an air cylinder 9 is fixed via a bracket 8. The middle portion of the first lever 6 is supported so as to be rotatable around the support member 7, and one end portion of the first lever 6 is connected to the air cylinder 9
It is supported by a joint 11 fixed to the tip of the rod 10. Further, the first lever 6 is provided with a cam follower 12 that urges the cam surface coaxially with the horizontal center line of the cam shaft 5. The air cylinder 9 is a cam follower.
Pressure is applied to the side where the rod protrudes from the cylinder in order to keep 12 constantly biased to the cam surface.

During assembly, the rod 10 of the air cylinder 9 is left free and is connected to one end of the first lever.
When the connection is completed, apply a predetermined pressure.

The other end of the first lever is connected to one end of the first rod 13, and the other end is connected to one end of a second lever 15 which is supported and swingable right and left about a pin 14 of a support member. There is. In addition, the support member 16 is a stopper that operates (by an air cylinder or the like) when an abnormality is detected in the tool station.
17 is provided to control the swing of the second lever 15.

One end of a second rod 18 is connected to the other end of the second lever 15, and the other end is linked to the tool station 19.

It should be noted that a plurality of such units are usually provided on one table.

Next, the operation will be described.

When power is supplied to a cam drive source (not shown), the cam 4 of each unit starts rotating counterclockwise, for example. Cylinder rod
Since the pressure is applied in the direction in which 10 projects, the cam follower 12 of the first lever 6 is always urged to the cam surface via the fulcrum, while the first rod connected to the first lever 6 is moved to the left. Move in the direction. When the first rod 13 moves to the left, the second lever 15 rotates around the fulcrum, and the second rod 18
To the right to move the tool or tool station 19
Is also moved to the right. At this time, a work (for example,
Place the writing instrument's tail plug, etc.). At the same time, a work a conveyed from a conveyor or the like arranged on the table 2
(For example, a writing instrument shaft or the like) is placed in front of the work (tail plug or the like). Further, since the cam 4 is rotated, each lever and rod move in the opposite direction to the above-mentioned direction, and the rule of the tip of the second rod 18 pushes out the work (tail plug) and press-fits it into the work (axial cylinder). At this time, the pressure of the air cylinder 9 is used for press-fitting. When the pressure is weak, the pressure may be increased. On the contrary, the pressure may be weakened for the work that does not require the pressure (see FIG. 1).

Further, when there is no work in the tool station 19 or the like, or when the position is misaligned, the sensor detects and the stopper 17 projects to stop the swing of the second lever 15 to prevent the tool and the work from being damaged (second See figure).

FIG. 3 shows a second embodiment of the present invention, which is an assembly and processing unit capable of performing the work of the first embodiment from the opposite side. A table 21 is fixed to the upper surface of the frame 20. Below the table 21, a plate 22 is fixed, and a cam shaft 24 connected to a cam drive source having a cam 23 fixed to the middle portion of the plate 22 is rotatably provided at right angles to the plate. . Further, a part of the cylinder of the air cylinder 30 is fixed via the bracket 25. A first lever 26, a second lever 27, and a support member 28 are fixed below the plate 22. An intermediate portion of the first lever 26 and one end portion of the second lever 27 are rotatably supported by the support member 28, and one end portion of the first lever 26 is a joint 32 fixed to a tip of a rod 29 of the air cylinder 30.
Supported by. Further, the second lever 27 has a cam follower 31 for urging the cam surface coaxially with the horizontal center line of the cam shaft 24.
Is provided. The other end of each of the first and second levers is connected by a first rod 33 to form a parallelogram link.

In the air cylinder 30, pressure is applied to the side where the rod 29 is brought out of the air cylinder in order to constantly urge the cam follower 31 toward the cam surface.

The other end of the second lever 27 is connected to one end of the third lever 35 by a second rod 34 parallel to the table, and the intermediate portion of the third lever 35 is made rotatable by a pin 37 provided on a support member 36. There is. The other end of the third lever 35 supports one end of a third rod 38 parallel to the table, the third rod 38 conveys the work 39, passes under the conveyor 40 fixed to the table, and intermediates the fourth lever 41. Supported by. One end of the fourth lever 41 is supported by a support member 42 fixed to the table, and the other end supports a fourth rod 43. 4th rod
The tip of 43 is connected to the tool inside the tool station 44.

Next, the operation will be described.

The operation up to the third lever is substantially the same as that of the first embodiment, so the description is omitted. When the third lever 35 swings to the left and right, the fourth lever 41 supported by the support member in parallel with the third lever 35 also swings in the same direction via the third rod 38. Then, the tool attached to the fourth rod 43 also moves in the same direction to perform the work.

In addition, the first lever 26, the second lever 27, the support member 36, the first
The rod 33 has a parallelogram shape because the first lever 26 has the same shape as that of the first embodiment described above, and the air cylinder is
Same 30 mounting position, standardization of parts (standardization)
It was because I measured.

(Effect) According to the present invention, the rotational force of the cam rotated by the drive source is transmitted to a tool such as press-fitting, carrying, and assembling via a plurality of swinging levers and a rod connecting the plurality of levers. In a driving force transmission device of an automatic assembly machine, a cam follower is attached to an intermediate portion of a lever that comes into contact with the cam, a fluid cylinder is connected to one end of the lever, and the cam follower is biased to the cam by the pressure of the fluid cylinder. Also, when a work abnormality is detected, a stopper mechanism that engages with the lever and stops the lever at a position away from the cam is provided. It is necessary and easy to assemble, and it is not necessary to prepare multiple types of springs for multiple types of devices as in the past, and parts management is easy. It has an effect.

Further, since the stopper mechanism is activated when the work abnormality is detected and the swing of the lever can be stopped, the tool station and the work are not damaged.

[Brief description of drawings]

FIG. 1 is a front view of the first embodiment of the present invention when the cam followers are in pressure contact, FIG. 2 is a front view of the same cam followers when not in pressure contact, FIG. 3 is a front view of the second embodiment of the present invention when cam followers are in pressure contact, and FIG. FIGS. 5 and 6 are front views of the conventional device when the cam follower is not in pressure contact. 1,20… Frame, 4,23… Cam 5,24… Cam shaft, 6,26… First lever 9,30… Air cylinder, 10,29… Rod 12,31… Cam follower, 13,33… First rod 15,27 ... second lever, 18,34 ... second rod 35 ... third lever, 38 ... third rod

Claims (1)

[Scope of utility model registration request] 1. An automatic assembling machine for transmitting the rotational force of a cam rotated by a drive source to a tool such as press-fitting, carrying, and assembling through a plurality of swinging levers and a rod connecting the plurality of levers. In the driving force transmission device, the cam follower is attached to the intermediate portion of the lever that abuts the cam, the fluid cylinder is connected to one end of the lever, and the cam follower is biased to the cam by the pressure of the fluid cylinder. A driving force transmission device for an automatic assembly machine, comprising a stopper mechanism that engages with the lever and stops the lever at a position away from a cam when a work abnormality is detected.