JPH0618749Y2 - Screw tightening device with screwdriver with torque limiter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a device for holding a cap on the tip of a driver with a torque limiter and tightening the cap with a constant torque.

(Prior Art) FIG. 2 shows a conventional screw tightening device using a driver with a torque limiter. Reference numeral 1 denotes a spline shaft provided at the tip of the robot arm 2, which is vertically moved by a collect chuck up / down cylinder 3 provided in the robot arm 2 in parallel with the spline shaft 1. A pulley 4 and a collect chuck 5 are attached to the tip of the spline shaft 1. Reference numeral 6 is a well-known driver with a torque limiter, which links a front end pulley 7 and a pulley 4 of the spline shaft 1 with a belt 8. Reference numeral 9 is a parallel chuck that holds a bottle 11 having a screw cap 10, and 12 is a cap that is screwed into the screw cap 10.

When tightening the screw, the cap 12 gripped by the collect chuck 5 by the driver 6 with the torque limiter is screwed into the screw port 10 and the torque is detected at the set torque, and the driver 6 with the torque limiter is stopped.

(Problems to be solved by the invention) By the way, in the above-mentioned prior art, when the chuck holding the cap is accelerating and decelerating, it is difficult to accurately measure the screw tightening torque due to the inertial weight of the chuck.
As the inertial weight of the chuck increases, the tightening torque varies, and it is very difficult to control the screw tightening torque.

(Means for Solving Problems) In order to solve the above problems, the present invention has a cap gripping portion attached to the tip of a driver with a torque limiter, and a cap is screwed at a position facing the cap gripping portion. The chuck supporting the member is rotatably arranged so that the rotation axis of the chuck is coaxial with the rotation axis of the cap gripping portion, the chuck is connected to a rotary drive source such as a rotary actuator, and the rotary drive source is driven with a predetermined torque. It is characterized in that it is biased in the anti-rotation direction.

Hereinafter, description will be given based on the embodiment shown in FIG. Reference numeral 5 is a collect chuck, 12 is a cap, and 9 is a parallel chuck for holding a bottle 11 having a screw cap 10, which is the same as that of the conventional apparatus shown in FIG. The present invention has a shaft 13 projecting from the lower end of the parallel chuck 9 for holding a bottle 11, and is rotatably supported by a bearing 16 of a frame 15 fixed to a base 14.
The lower end of the shaft 3 and the upper end of the shaft 18 of the rotary actuator 17 attached to the frame 15 are connected via a coupling 19 to urge the rotary actuator 17 in a counter-rotational direction with a predetermined torque.

Next, the operation will be described. The cap 12 held by the collect chuck 5 with the driver with the torque limiter is screwed into the screw mouth 10 of the bottle 11 and tightened. When the set torque is reached, the torque is detected and the rotation of the driver with the torque limiter is stopped. , The collect chuck 5 rotates due to its own inertial force, but when the torque exceeds the set torque of the rotary actuator 17, the shaft 18 of the rotary actuator 17 loses the force urging the rotary actuator 17 in the counter-rotational direction. Rotate,
The cap 12 and the bottle 11 rotate in the same direction and are not tightened any more.

A rotary drive source such as a powder clutch or a torque sensor may be used instead of the rotary actuator.

(Effect) According to the present invention, a cap gripping part is attached to the tip of a driver with a torque limiter, and the chuck rotating shaft supporting the member for screwing the cap at a position facing the cap gripping part is the rotary shaft of the cap gripping part. Since the chuck is connected to a rotary drive source such as a rotary actuator, and the rotary drive source is biased in a counter-rotational direction by a predetermined torque, the torque of the screw tightening torque varies. The screw can be securely tightened with the set torque without being influenced by the set torque and rotation speed of the driver with the torque limiter and the inertial weight of the chuck.

[Brief description of drawings]

FIG. 1 is a partially cut front view of an embodiment of the present invention, and FIG. 2 is a front view of a conventional device. 1 …… Spline shaft 2 …… Robot arm 3 …… Collect chuck Vertical cylinder 5 …… Collect chuck 9 …… Parallel chuck 10 …… Screw cap 11 …… Bottle 12 …… Cap 17 …… Rotary actuator 19 …… Cup ring

Claims (1)

[Scope of utility model registration request] 1. A cap gripping part is attached to a tip of a driver with a torque limiter, and a chuck rotation shaft supporting a member for screwing the cap at a position facing the cap gripping part is coaxial with a rotation shaft of the cap gripping part. It is rotatably arranged so that the chuck is connected to a rotary drive source such as a rotary actuator, and the rotary drive source is biased in a counter-rotational direction with a predetermined torque. apparatus.