JP2000094085A - Stroke change device in riveting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extremely easily change a stroke of a rivet head forming tool in a riveting machine. SOLUTION: The riveting machine is provided with a rotary cylinder 32, which is freely rotated at a fixed position, is arranged above a cylinder, the thread part 38 of an outer peripheral face of an elevation plate prevented from rotating by an appropriate means is screwed in a thread part 33 of the inner peripheral face of the rotary cylinder, a piston shaft descend stopper device, which is arranged to the elevation plate and a piston shaft 24, a slider 55, which is horizontally guided near an outside of the rotary cylinder by an appropriate guide member 53 and is reciprocated/slid by the cylinder 54, a stop device 61, which is adjustable for advancement/retreatment stop positions of the slider, and a protruding member 46, which is displaceable for a protruding position for the rotary cylinder and is arranged an outer periphery of the rotary cylinder, by movably engaging the protruding member and the slider, a descending stroke of a rivet head forming tool is changed by sliding of the slider.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for changing the stroke of a riveting tool in a riveting machine.

[0002]

2. Description of the Related Art As a conventional technique for changing the descending stroke of a rivet head forming tool in a riveting machine, as disclosed in Japanese Utility Model Publication No. 3-35465, a pitch equal to the distance between stroke regulating pins is determined by operating an indexing motor. When the annular plate is driven intermittently in one direction, when the annular plate is stopped, a pin that matches the axial length of the rivet shaft, that is, a pin that regulates the lowering stroke of the rivet head forming tool, is located immediately below the stopper pin. It has become.

[0003] The above-mentioned stroke regulating pin can adjust the length of projection of the head end (upper end face) of the stroke regulating pin with respect to the upper surface of the annular plate while being screwed into the screw hole of the annular plate.

The above-mentioned adjustment is not limited to the difference in the shaft length of the stud shaft, but also the difference in the thickness (height) of the swaged head and the difference in the shaft diameter of the stud shaft and the difference in the upper surface of the product (work). This is caused by a step.

[0005]

According to the method for changing the lowering stroke of the rivet head forming tool as described above, a large number of pins are erected on the entire peripheral edge of the annular plate. Can be changed to

[0006] However, since the screwing method is adopted for the erecting of the pins, there is a problem that the adjustment of the height of the set dimensions is extremely troublesome, and a pair of two pins on a line crossing the center of the annular plate. Therefore, there was also a problem that a pair of two pins had to be matched to the same level of height.

[0007] Therefore, an object of the present invention is to make it possible to change the descending stroke of the rivet head forming tool extremely easily, and in particular, to switch between two stages of a minute stroke.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a spindle which is supported by a cylinder supported by a column and which is passed through the axis of the piston shaft together with the piston shaft. In a riveting machine, while lowering, press a molding shaft of a rivet head forming tool provided at a lower end of the spindle against a rivet shaft of an article, and drive the spindle by a motor to form a rivet head on the riveting shaft. A rotating cylinder that rotates freely at a fixed position is provided on the upper side of the rotating cylinder, and a screw portion on an outer peripheral surface of a lifting plate that is prevented from rotating by appropriate means is screwed into a screw portion on an inner peripheral surface of the rotating cylinder, and Providing a lower stopper device for the piston shaft with the piston shaft,
In addition, a slider is provided in the vicinity of the outside of the rotary cylinder in the horizontal direction by an appropriate guide member and slides forward and backward by the action of the cylinder, and further, an adjustable stop device for positioning the forward and backward stops of the slider is provided.
Along with providing a projecting member capable of displacing a projecting position with respect to the rotating cylinder by an appropriate fixing means on an outer periphery of the rotating cylinder,
A configuration in which the projecting member and the slider are movably engaged is adopted.

[0009]

Embodiments of the present invention will be described with reference to the accompanying drawings.

In the embodiment of the present invention, as shown in FIGS. 1 to 5, reference numeral 21 denotes a column which stands upright from a seat base 22, and a cylinder 23 is supported on an upper end of the column 21.

Further, a spindle 25 is provided on the axis of the piston shaft 24 which moves up and down by the contracting and extending actions of the cylinder 23 and penetrates therethrough and freely rotates at a fixed position. Further, at the lower end of the spindle 25,
A tack head forming tool 26 is provided.

Although the detailed structure of the rivet head forming tool 26 is omitted because it is well known, the center of the lower surface of the lower surface of the forming shaft 27 for tilting the axis and rotating and swinging, and the spindle 2
5 is aligned with the axis.

A motor 29 is installed directly above the cylinder 23 via a spacer 28, and the motor 29 is transmitted from an output shaft 30 of the motor 29 to the spindle 25 via an expansion joint 31.

The expansion joint 31 is slidably fitted in the case shown in the figure, and is constituted by a square shaft and a square hole for transmitting rotation, but may be transmitted by other structures.

Reference numeral 32 denotes a rotary cylinder fitted to the outside of the spacer 28 and having a lower edge rotatably attached to the upper end of the cylinder 23. A screw portion 33 is provided on the inner periphery of the rotary cylinder 32. .

In the method of mounting the rotary cylinder 32, the ring 34 is divided into a required number and fixed to the upper end of the cylinder 23 in the illustrated case.
2 and an annular groove 36 provided on the outer periphery thereof are fitted.

Reference numeral 37 denotes an annular elevating plate fitted to the upper part of the piston shaft 24 so as to prevent rotation by appropriate means, and a screw portion 38 provided on the outer periphery of the elevating plate 37 is screwed into the screw portion 3.
Screw into 3.

The rotation of the elevating plate 37 is prevented by a plurality of longitudinal slots 39 provided in the spacer 28 in the case shown.
The lower end of a shaft (not shown) penetrating through a through-hole (not shown) provided in the elevating plate 37 is connected to the cylinder 2.
A method of fixing to the upper end of 3 may be adopted. in short,
The rotation of the lift plate 37 is prevented, and only the lift is allowed.

The screw portion 38 is provided due to the provision of the projection 40.
Are provided on the end faces in the protruding direction of the respective protrusions 40.

Further, a descent stopper device 41 for the piston shaft 24 is provided between the lifting plate 37 and the piston shaft 24.

In the illustrated stopper device 41, a flange 42 is provided on the outer periphery of the upper end of the piston shaft 24, and the flange 42 is brought into contact with the upper surface of the elevating plate 37. By piston shaft 2
4 may be stopped.

With the above construction, the lifting plate 37 is raised or lowered by the reversible rotation of the rotary cylinder 32, and the lowering stroke of the piston shaft 24 is freely adjusted by the contact between the lifting plate 37 and the flange 42. Can be.

Further, on the outer periphery of the rotary cylinder 32, a protruding member 46 whose protruding position can be freely displaced by an appropriate fixing means 45 is provided.

The fixing means 45 includes a separation ring 47 fitted in the rotary cylinder 32 in the case shown in the drawing,
A protruding piece 48 protruding from the cut-off end of the other protruding piece, a through hole 49 of the one protruding piece 48, and a bolt 51 inserted into the through hole 49 and screwed into the screw hole 50 of the other protruding piece 48. However, for example, a method in which the projecting member is displaceably fixed via a fastener that movably engages with the outer peripheral annular groove of the rotary cylinder 32 may be adopted.

In the vicinity of the projecting member 46, a slider 55 which is guided in the horizontal direction by a guide member 53 and slides forward and backward by the action of the cylinder 54 is provided. Engage.

The above-mentioned movable engagement is achieved by a concave portion 56 provided inwardly from the periphery of the slider 55 in the case shown in the drawing, and a rotation that is pivotally supported by the tip of the projecting member 46 and fitted into the concave portion 56. And the child 57.

In the illustrated embodiment, the guide member 53 has a projection slidably engaged with a dovetail groove in the drawing, but may use a parallel shaft as a guide.

Further, the slider 55 is stopped by a stop device 61 capable of freely adjusting the forward / backward stop positioning.

The above-mentioned stopping device 61 comprises a screw shaft screwed into both ends of the guide member 53 in the case shown, and a locking nut for the screw shaft.

The reciprocating cylinder 54 of the slider 55
Is mounted on the guide member 53 and the tip of the piston rod is connected to the slider 55 in the case of the drawing, but a slider built-in type may be used for the slider.

With the above construction, when the slider 55 is advanced downward in FIG. 5 by the extension action of the cylinder 54, the rotary cylinder 32 is moved clockwise in FIG. Is retracted, the rotary cylinder 32 rotates in the counterclockwise direction in FIG.

Then, the elevating plate 37 is moved up and down with the rotation of the rotary cylinder 32, so that the stop (stroke) stop position of the piston shaft 24 by the stopper device 41 is changed.

For this reason, as shown in FIG. 6, it is possible to caulk even a stud having a step a at the top because the article A has a step.

Of course, even if the product has no step and has different caulking heights at the top of the stud due to the difference in stud shaft diameter, the top end of the jig B can be changed by changing the jig B as shown in FIG. Even if there is a step b in (height), the stroke required for each jig B can be obtained by changing the descending stroke of the piston shaft 24.

The adjustment of the descending stroke of the piston shaft 24 according to the height of the jig, the thickness of the product, and the like is performed by first loosening the bolt 51 and rotating the rotary cylinder 32, and adjusting the swaging height by sliding the slider 55. The determination of the size of the minute difference is performed by stopping and positioning the slider 55 by adjusting the stopping devices 61 and 61.

[0036]

Since the stroke changing device in the riveting machine according to the present invention is constructed as described above, it is very easy to switch between different swaging strokes with a minute stroke by stopping the advance / retreat slider at the stop position. In addition to the above, different adjustment of the minute stroke can be performed easily and quickly.

[Brief description of the drawings]

FIG. 1 is a side view of a riveting machine according to the present invention.

FIG. 2 is a longitudinally enlarged side view showing a main part of the above.

FIG. 3 is an enlarged side view showing a main part.

FIG. 4 is an enlarged front view of a cutout of the same part.

FIG. 5 is a cross-sectional plan view of the same.

FIG. 6 is a front view of a crimped item.

FIG. 7 is a front view of a jig.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Column 22 Seat 23 Cylinder 24 Piston shaft 25 Spindle 26 Tack head forming tool 27 Molding shaft 28 Spacer 29 Motor 30 Output shaft 31 Expansion joint 32 Rotating cylinder 33, 38 Thread part 34 Ring 35 Projection 36 Annular groove 37 Elevating plate 39 Long hole 40 Projecting part 41 Stopper device 42 Flange 45 Fixing means 46 Projecting member 47 Ring 48 Projecting piece 49 Through hole 50 Screw hole 51 Bolt 53 Guide member 54 Cylinder 55 Slider 56 Depressed part 57 Rotor 61 Stop position

Claims (1)

[Claims] 1. A rivet head forming tool provided at the lower end of a spindle, while lowering a spindle which is supported by extending a cylinder supported by a column through a shaft of the piston shaft together with a piston shaft. In a riveting machine in which a molding shaft is pressed against a tack shaft of an article, and the spindle is driven by a motor to form a tack head on the tack shaft, a rotating cylinder that freely rotates at a fixed position above the cylinder is provided. Screwing the screw portion of the outer peripheral surface of the lifting plate whose rotation has been prevented by appropriate means into the screw portion of the inner peripheral surface of the cylinder, and providing the piston shaft lowering stopper device to the lifting plate and the piston shaft; A slider is provided in the vicinity of the outside of the rotating cylinder, which is horizontally guided by an appropriate guide member and slides forward and backward by the action of the cylinder. Further, an adjustable stop device for positioning the forward and backward stops of the slider is provided, and a protruding member capable of displacing the protruding position with respect to the rotary cylinder by an appropriate fixing means is provided on the outer periphery of the rotary cylinder. A stroke changing device in a riveting machine, wherein a member and the slider are movably engaged.