JPS60118429A - Part gripping device - Google Patents

Abstract

PURPOSE:To eliminate a positioning mechanism from a part holding device to aim at reducing the cost of a part gripping device, by providing a gripping pawls which are attached to a movable member of a rectilinearly moving type actuator inclined with respect to the elevating center axis of a screw fastening machine and directed to the working position of the screw fastening device. CONSTITUTION:An air cylinder 32 as a rectilinearly moving type actuator which is inclined so as to be directed to the working point 31 of a screw fastening part 8 is secured by means of an attaching plate 33, and a piston rod 34, as a movable member, in an air cylinder 43, is attached at its front end with a gripping mechanism 36 having pawls 35 which is opened upon retraction of the piston rod 34 but is closed upon maximum extension of the same. The gripping mechanism 36 is laid in a position which is shifted from the elevating center axis 37 of the screw fastening part 8 in its stand-by condition, and the cylinder 32 is attached in an inclined direction toward the working point 31 of the screw fastening part 8 so that the gripping mechanism 36 is timedly extended to the working point 31 to grip a part P.

Description

[Detailed Description of the Invention] The present invention relates to a parts gripping device, and more particularly to a parts gripping device for fixing parts to prevent them from rotating or shifting during screw tightening work with a screw tightening machine. It is something.

Screw tightening machines dedicated to screw work used on assembly lines, etc. are already well known, but normally such screw tightening machines only perform screw tightening work, and holding the parts screwed to the workpiece is done by another machine. I have no choice but to rely on a holding device.

Therefore, in the conventional device, in addition to the positioning mechanism for the workpiece of the screw tightening machine, a positioning mechanism for the ten parts holding device is also required, and since such positioning requires precision, the positioning mechanism for the parts holding device is required. This has the disadvantage that the cost increases due to the drive device.

Therefore, an object of the present invention is to omit the above-mentioned positioning mechanism and drive mechanism of the parts holding device, to reduce costs, and to provide a rational arrangement of such a parts holding device. The gist of this is that in a parts gripping device for fixing a part to a workpiece while being screwed by a screw tightening machine, the screw tightening machine The present invention provides a parts gripping device in which a linear actuator oriented in the direction of the work point is attached to the screw tightening machine, and a gripping claw is attached to a moving member of the linear actuator.

Next, specific embodiments of the present invention will be described with reference to the drawings to provide an understanding of the present invention.

Here, FIG. 1 is a front view of the entire parts mounting device including a parts gripping device according to an embodiment of the present invention, FIG. 2 is a view taken from arrow A in FIG. 1, and FIG. 3 is a view taken from arrow B in FIG. This is a perspective view.

In the figure, the parts mounting bag W4 includes a posopa 6 for storing parts, a parts scoop 7 for taking out the parts from the posopa 6, a drive mechanism (not shown) for vertically swinging the parts scoop 7, and a parts scoop 7. A rail 9 that feeds the bolts supplied by 7 to the screw tightening section 8 below, a screw tightener 5 that screws these parts P onto the workpiece W, and an elevating cylinder 10 that lifts and lowers the entire screw tightener 5. , a guide rod 11, a drive mechanism 12 for driving the screw tightening section 8, etc., and the screw tightening machine 5 is a third
As shown in the figure, it is attached to a pedestal 14 via a bracket 13, and the pedestal 14 is supported by a base 17 via a guide block 16 that slidably fits into a guide rail 15 attached to the lower surface of the pedestal 14. Furthermore, the base 17 is attached to the pedestal 20 via a guide block 18 attached to the lower surface of the base 17 and a guide rail 19 that is slidably fitted to the guide block 18.
The screw tightening machine 5 can be slid in each direction on a guide rail 19 that is perpendicular to the guide rail 19. In addition, as shown in FIG.
4 has a threaded rod 21 parallel to the guide rail 15.
A motor 22 that rotationally drives the motor 2 is fixed.
The rotation of 2 is transmitted to the threaded rod 21 via gears 23,24. This threaded rod 21 is screwed into a female threaded portion 25 attached to the base 17.

Further, as shown in FIGS. 1 and 3, the guide rail 1 is connected to a motor 26 fixed to the pedestal 20 via a gear (not shown).
5 is connected to a threaded rod 27 at right angles to the threaded rod 27, which is threaded into a threaded portion 28 fixed to the base 17 as shown in the third figure.

Therefore, when the motor 26 fixed to the pedestal 20 rotates and the threaded rod 27 is driven, the base 17 is moved to the guide rail 19 via the female threaded portion 28 which is threadedly engaged with the threaded rod 27.
When the threaded rod 21 rotates as the motor 22 fixed to the pedestal 17 rotates, the pedestal 14 advances in the direction of the threaded rod 21, and therefore the pedestal 14 having the female threaded portion 25 and the threaded rod 21 rotate. The screw tightening machine 5 attached to the frame 14 slides in the direction of the guide rail 15 or 19. Therefore, by adjusting the amount of rotation of the motors 22 and 26, the screw tightening machine 5 can be positioned at any position. Since the detailed mechanism of the screw tightening tMt5 as described above is already known, its explanation will be omitted here.

As shown in FIGS. 1 and 2, the L-shaped bracket 30 attached to the cover 29 (FIG. 1) of the screw tightening machine 5 as described above has a An air cylinder 32, which is a type of linear actuator that tilts toward the front, is fixed via a mounting plate 33, and a piston rod 3, which is a type of moving member of the air cylinder 32,
A gripping mechanism 36 having a gripping claw 35 that opens when the piston rod 34 of the air cylinder 32 retreats and closes when it advances to the maximum extent is attached to the tip of the piston rod 4 .

The gripping mechanism 36 is connected to the air cylinder 3 as shown in FIG.
When the second piston rod 34 is retracted, it is attached to the air cylinder 32 which is tilted as described above so that it waits at a position away from the vertical axis (center axis) 37 of the screw fastening part 8. For example, when tightening the part P shown in Figs. 1 and 2 to the workpiece W with a bolt, as the bolt is tightened, the part P will rotate unless it is gripped, and the mounting position will not be accurate. This is to grip and fix the part P in a fixed position on the workpiece W when tightening, and it is used to grip and fix the part P in place, for example when inserting a bolt into the center of a cylindrical part and tightening the bolt. If it is not necessary to keep it fixed, or if you are tightening a screw on a part that is too large or shaped to be gripped by the gripping claws 35, it is better to move it to a position outside the working range of the screw tightening machine 5. It is preferable to leave it there. Therefore, as described above, the gripping mechanism 36 is placed in a standby state at a position away from the vertical axis (center axis) 37 of the screwed part 8, as shown in FIG. By attaching it diagonally toward the work point 31 of No. 8, the gripping mechanism 36 is configured to project toward the work point 31 at an appropriate time and grip the part P.

As described above, the present invention provides a parts gripping device for fixing a part to a workpiece while being screwed by a screw tightening machine, which is tilted with respect to the vertical axis of the screw tightening machine. The parts gripping device is characterized in that a linear actuator oriented in the direction of the work point is attached to the screw tightening machine, and a gripping claw is attached to the moving member of the linear actuator. It is extremely economical since there is no need to provide a mechanism or its drive mechanism, and it can be retreated to a position where it does not interfere with other work, so it can dramatically improve work efficiency.

[Brief explanation of drawings]

FIG. 1 is a front view of the entire parts mounting device including a parts gripping device according to an embodiment of the present invention, FIG. 2 is a view in the direction of arrow A in FIG. 1, and FIG. 3 is a view in the direction of arrow B in FIG. It is. (Explanation of symbols) 5...Screw tightening machine 6...Hopper 37...Elevating center axis 31...Working point 32...Air cylinder (straight-moving actuator) 35...Gripping claw 36...・Gripping mechanism. Person appearing: Mita Kogyo Co., Ltd. Agent Patent attorney Takeo Honjo

Claims (1)

[Claims] In a parts gripping device for fixing a part to a workpiece while being screwed by a screw tightening machine, a straight-moving device that is inclined with respect to the vertical axis of the screw tightening machine and directed toward the work point of the screw tightening machine is used. A parts gripping device characterized in that a mold actuator is attached to the screw tightening machine, and a gripping claw is attached to a moving member of the linear actuator.