JPH02137638A - Cordless rivet caulking device - Google Patents

Abstract

PURPOSE:To inexpensively produce and assemble a gear case equipped with an output shaft bearing section by forming the case in a state where the case is divided into an upper and lower cases and tightening the upper and lower cases with bolts, etc., while a flanged cylinder is held between the upper and lower cases. CONSTITUTION:A lower case 14 is formed to a semi-cylindrical shape in which the lower half section of the outer peripheral circle of the cylindrical section of a flanged cylinder 13 is inserted into the port edge section of the lower case 14. A groove 14' for fitting the flange of the cylinder 13 is provided in the inner surface of the case 14 and an upper case 15 having the same shape of the inner surface of the front edge section as the lower case has 14 is put on the upper surface of the lower case 14 so as to hold the flanged cylinder 13 at a prescribed position. Shifting of the cases 14 and 15 from each other is prevented by the front edge and rear edge flange sections of the cylinder 13. Moreover, rear end sections of a gear case 3 and the upper and lower cases 15 and 14 are positioned by an output shaft 8 and at as a factor absorbing the unbalance between the operating force applied to each case.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention rotates a small motor and rotates an eccentric cam through a speed reduction mechanism to generate a crank motion, and the reciprocating motion caused by this motion causes an extension bar to be rotated. The needle part of the blind rivet is gripped by the wedge-shaped jaw attached to the front end of the extension bar, and the needle is pulled and broken. At this time, the compressive deformation generated in the rivet part causes the rivet to be crimped to the riveting member. The present invention relates to a positioning structure for a device case.

2. Description of the Related Art Conventionally, the case of this type of crimping device has been assembled by forming a positioning pin or a circular fitting portion in advance and fitting a separated gear box main body and its lid portion. However, when combining a plurality of divided cases using positioning pins, the number of positioning pins is naturally required at two or more locations, and sufficient ingenuity is required to ensure machining accuracy.

In addition, when providing a circular fitting part, sufficient ingenuity is required for machining such as cutting for cases with complex shapes.
These processes have the disadvantage of being time-consuming and costly.

Means for Solving the Problems The present invention eliminates the above-mentioned problems. It uses a small electric motor as the power source, uses a planetary reducer to reduce the rotational force primarily, and uses a group of spur gears to reduce the rotational force to the secondary. An eccentric cam is installed on the output shaft that decelerates and rotates integrally with the final stage spur gear, and a connecting rod that performs crank motion is loosely fitted to this eccentric cam, converting the rotation of the motor into a back and forth reciprocating motion. In a blind rivet caulking device having a wedge-shaped jaw for gripping a needle of a blind rivet at the distal end of a connected extension bar, a case housing the eccentric cam, a connecting rod, an extension bar, and a cylinder through which the extension bar is inserted is attached to the cylinder. The cylinder is divided into an upper and a lower case at the center of the cylinder, and the flange of the cylinder is fitted into a groove provided on the inner surface of the front end of both cases for positioning, and the cylinder is held between the upper and lower cases, and the lower case A gear case for storing a group of spur gears is attached to the lower surface of the device, a bearing portion for an output shaft is formed at the rear end of the upper and lower cases and the gear case, and the upper and lower cases and the gear case are positioned by the output shaft. The present invention provides a blind rivet caulking device.

Example Next, one embodiment of the present invention will be described based on the drawings.

Reference numeral 1 is a small motor as a power source, and 2 is a planetary speed reducer that receives the rotational force of the motor to perform primary deceleration, and in this embodiment has a two-stage speed change function. Reference numeral 3 designates a gear case that constitutes a part of a gear box that transmits the rotational force of the planetary reduction gear to the next-stage output spur gear 4 and holds the top of the rivet caulking device. The rotation is transmitted to the secondary reduction gear 5 , and from the secondary transmission gear 6 formed integrally with the secondary reduction gear 5 to the tertiary reduction gear 7 .

An output shaft 8 is fixedly fixed to the tertiary reduction gear 7, and the rotation of the tertiary reduction gear 7 corresponds to the rotation of the output shaft 8. A connecting rod 10 is loosely fitted on the outer periphery of an eccentric cam 9 spline-coupled to the output shaft 8. Rotation of the eccentric cam 9 causes eccentric rotation, and the tip of the connecting rod 10 reciprocates back and forth.

An extension bar 11 is connected to the tip of the connecting rod 10 by a pin 12, and the extension bar 11 is inserted into a flanged cylinder 13 and slides back and forth.

Each of the parts forming these main mechanical parts is attached to a lower case 14 arranged so as to overlap the gear case 3 described above.

The front edge of the lower case 14 is connected to the flanged cylinder 13.
It is formed into a semi-cylindrical shape into which the lower half of the outer circumferential circle of the lower case 14 is inserted, and a groove 14' into which the flange of the cylinder 3 fits is provided on its inner surface. An upper case 15 whose edge inner surface shape is the same as that of the lower case is arranged to hold the flanged cylinder 3 in a predetermined position.

In addition, the gear case 3. Bearings for the output shaft 8 are provided at the rear ends of the upper and lower cases 15 and 14, and the output shaft 8 is loosely fitted through these crowns.

Therefore, the upper case 15 and the lower case 14 are prevented from shifting back and forth by the front edge flange portion and the rear edge flange portion of the flanged cylinder 3, and the gear case 3. Up·
The rear end portions of the lower cases 15 and 14 are positioned by the output shaft 8, and serve as elements for absorbing the imbalance of operating forces applied to each case.

A needle discharge spring 16 is inserted into a hole in the center of the extension bar 11. A needle discharge pin 17 is inserted into the tip of the spring 16, and a jaw release fitting 18 is attached to the tip of the needle discharge bin 17 with a spring 19.
A wedge-shaped jaw 21 inserted into a wedge-shaped jaw tightening cylinder 20 is disposed at the tip of the wedge-shaped jaw 21, and these are inserted and set into a guide cylinder 23 into which a rivet nut 22 is screwed. Further, the guide tube 23 into which the extension bar 11 and the like are inserted is screwed and fixed by a cap 24 to a threaded portion provided on the outer peripheral surface of the front flange of the flanged cylinder 13.

Since the blind rivet caulking device of the present invention is constructed as described above, when the driving force is applied by the motor 1, the rotational force is transferred from the planetary reduction gear 2 to the output spur gear 4.2.
It is sequentially transmitted to the secondary reduction gear 5, the secondary transmission gear 6, and the tertiary reduction gear 7, and rotates the output shaft 8. The output shaft 8 rotates the eccentric cam 9 and connects the connecting rod 1 which is inserted into the eccentric cam.
0 is eccentrically rotated and converted into a back and forth reciprocating motion using the pin 12 (support point) of the extension bar 11. .

By this reciprocating motion, the needle portion of the blind rivet inserted from the outside is gripped by the wedge-shaped jaw 21 and drawn into the guide tube 23 to perform the rivet crimping operation.
The needle part is tensed and broken, leaving only the rivet body in the rivet caulking part.

Effects of the Invention In a blind rivet crimping device, a tensile force sufficient to pull and break the needle is required, and naturally the reaction force is applied to the case.

In the present invention, a case having an output shaft bearing section at the rear end is molded into two parts, an upper case 15 and a lower case 14, and the flanged cylinder 13 is sandwiched between the upper and lower cases 15 and 14 and secured by bolts or the like. Tight integration can be ensured simply by tightening, and gear cases can be produced and assembled at low cost without the need for highly accurate positioning means, which is highly effective.

[Brief explanation of the drawing]

FIG. 1 is a top view showing an embodiment of the blind rivet fastening device of the present invention, FIG. 2 is a sectional view taken along line AAII in FIG. 1, and FIG. 3 is an exploded perspective view of the device of the present invention. 3... Gear case 8... Output shaft 13... Cylinder 14...
・Lower case 15...Upper case 14', 15'...Groove

Claims (1)

[Claims] A small electric motor is used as the power source, and a planetary reducer is used to firstly reduce the rotational force, and a group of spur gears provides secondary reduction.An eccentric cam is installed on the output shaft that rotates together with the final stage spur gear, and A blind rivet in which a connecting rod that performs a crank motion is fitted loosely into a core cam to convert the rotation of the motor into a back and forth reciprocating motion, and a wedge-shaped jaw that grips the needle of the blind rivet is provided at the tip of an extension bar connected to the connecting rod. In the caulking device, a case housing the eccentric cam, the connecting rod, the extension bar, and the cylinder into which the extension bar is inserted is divided into two parts at the cylindrical center of the cylinder, and is provided on the inner surface of the front end of both cases. The flange portion of the cylinder is fitted into the groove for positioning, the cylinder is sandwiched between the upper and lower cases, a gear case housing the spur gear group is attached to the lower surface of the lower case, and the upper and lower
A blind rivet caulking device characterized in that a bearing part for an output shaft is formed at the rear end of a lower case and a gear case, and the upper and lower cases and the gear case are positioned by the output shaft.