JPS62124839A - Automatic piercing nut assembly device - Google Patents

Abstract

PURPOSE:To enable the prevention of the occurrence of an eccentric load due to a pressing force in hammering a nut with a pressing punch by arranging and coupling the pressing punch and a nut retainer coaxially to the fitting member thereof for a press ram. CONSTITUTION:A pressing punch 22 is passed through a vertical hole 24 formed along the axial line of a nut retainer 23 for free sliding vertically and coupled coaxially to a sleeve 29 together with the nut retainer 23. A collar-shaped head 28 is so provided as to be continuous to the upper end of the pressing punch 22 and connected to the piston rod 41 of an air cylinder 40 built into a back plate 28 via a connection screw shaft 39. Consequently, the pressing punch 22 comes to be connected to the piston rod 41 of the air cylinder 40 so as to be hanging and vertically slidable very slightly. The air cylinder 40 is single-acting type and free in a normal condition.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is characterized in that the end face of a nut moves as a punch, and at the same time the nut itself punches a metal panel placed on a caulking die, it punches the metal panel. This invention relates to an automatic assembly device for fixed pierced earring nuts.

2. Description of the Related Art A conventional automatic assembly apparatus of this type will be explained with reference to FIG. The automatic assembly device includes a caulking die 1 on which a metal panel 16 is placed, a pressing punch 2 arranged opposite to the caulking die 1, a vertical hole 4 through which the pressing punch 2 is inserted so as to be vertically slidable; It is equipped with a nut holder 3 having a nut supply hole 5 perpendicular to the vertical hole 4, and the press punch 2 is attached to a holder (mounting is a member) 7 fixed to a press ram 6,
The nut holder 3 is attached to the holder via a guide post 8 fixed to the upper side of the nut holder 3 so as to be vertically movable. The guide post 8 is arranged parallel to the press punch 2 and attached to the holder 7, and has an engagement groove 9 carved on the side surface extending vertically parallel to the axis and a pin 10 (screwed onto the holder 7). The sliding range in the vertical direction with respect to the holder 7 is limited by the holder 7, and is urged downward by the action of the spring 11. Further, a chute connecting fitting 12 is fixedly attached to the nut holder 3, and pierce nuts (hereinafter simply referred to as nuts) 15 are continuously supplied through a flexible chute hose 13 connected to the connecting fitting 12.
are fed into the nut supply hole 5 and held one by one at a predetermined position where the vertical hole 4 and the nut supply hole 5 intersect. 14 indicates a nut holding device.

As the press ram 6 descends, the entire nut holder 3 continues to descend in the posture shown in FIG. 4 until it comes into contact with the metal panel 16 placed on the die 1. When the nut holder 3 comes into contact with the metal panel 16, the nut holder 3 stops and only the pressing punch 2 further descends, and the vertical hole 4
The nut 15 held inside is pressed against the metal panel 16 by the pressing punch 2, and the end face of the nut 15 is used to punch the metal panel 16, and at the same time, the side edge of the punched hole is caulked by the die 1.
By tightening, the nut 15 is attached to the metal panel 16.
It is designed to be fixed to.

Problems to be Solved by the Invention In the conventional pierce nut automatic assembly device described above, as is clear from the drawings, the axis of the press punch 2 and the axis of the guide post 8 that controls the vertical movement of the nut holder 3 are at a distance 11i.
Since it is eccentric by lte, the pressing force applied to the press punch 2 when driving the nut acts as an eccentric load on the guide post 8, and as a result, the post fitting hole of the guide post 8 and the holder 7 wears out only on one side, causing the guide post 8 to become eccentric. There is a problem in that the smooth vertical sliding movement of the nut 15 is obstructed, and this causes the nut 15 to be unable to be fed.

An object of the present invention is to provide an automatic pierce nut assembly device that solves the problems of the conventional device described above.

Means for Solving the Problems In order to achieve the above object, the present invention provides that the pressing punch and the nut holder are attached to the press ram by coaxially fitting them to the members, so that the nut is driven. The structure is such that the nut holder and the pressing punch can smoothly slide vertically by eliminating the occurrence of an eccentric load.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. 1st
The figure shows an automatic pierce nut assembly device according to the present invention, in which 21 is a caulking die on which a metal panel 16 is placed;
Reference numeral 2 denotes a pressing punch arranged opposite to the caulking die 21; 23 denotes a nut holder having a vertical hole 24 through which the pressing punch 22 is vertically slidably inserted; and a nut supply hole 25 perpendicular to the vertical hole 24. It is the body. The member 27 for attaching the pressing punch 22 and the nut holder 23 to the press ram 26 consists of a back plate 28 and a sleeve 29 fixed thereto.

The nut retainer @23 is formed into a cylindrical shape in order to have a structure that also serves as a guide post in the conventional device, and the sleeve 29
It is vertically slidable and inserted into the sleeve 29 by an engaging groove 30 extending parallel to the axis provided on the outer surface and a pin 31 (screwed onto the sleeve 29) that engages with the engaging groove 30. A spring 33 has a limited sliding range and is interposed between the flange 32 connected to the upper end and the back plate 28.
is urged downward by.

34 is a chute hose connection fitting, 35 is a chute hose, and 36 is a nut detector, through which nuts 15 are continuously supplied through the chute hose 35 and are supplied to a predetermined position where the vertical hole 24 and the nut supply hole 25 intersect. detect that there is a 37 is a nut holding device.

The pressing punch 22 is inserted into a vertical hole 24 bored along the axis of the nut holder 23 so as to be movable up and down.
3 and coaxially fitted into the sleeve 29. A flange-shaped head 38 is connected to the upper end of the press punch 22, and the head 38 is connected to a piston rod 41 of an air cylinder 40 incorporated in the back plate 28 via a connecting screw shaft 39. ing. As a result, the press punch 22 is connected to the piston rod 41 of the air cylinder 40 in a suspended state and can be vertically displaced by a small distance. The air cylinder 40 is a single-acting type and is normally free, and the press punch 22 is operated by a press spring 42 interposed between the head 38 and the back plate 28, as shown by the solid line in FIG. It is biased to be displaced downward by the action.

In this state where the pressing punch 22 is displaced downward,
The punch tip 22a connects the nut supply hole 2 of the nut holder 23.
The end opening of 5 is closed to prevent the nut 15 from being accidentally fed into the vertical hole 24.

The temporary nut feeding and stopping mechanism described above is useful, for example, when the pierce nut automatic assembly device is installed in a press machine together with other press dies for a work test, or for positioning a replaced die. This is effective in reliably preventing the nut 15 from being driven dry when the press ram is moved up and down.

Therefore, when actually assembling the nut, press ram 2
Every time the punch 6 moves up and down, the air cylinder 40 is operated in response to a work signal transmitted in conjunction with this movement, and the press punch 22 is pulled up against the spring 42 until the head 38 comes into contact with the back plate 28.

In this state, the nut 15 can be fed into the vertical hole 24, and as shown in FIG.
The nut 15 held in the vertical hole 24 of the nut holder 23 is pressed against the metal panel 16 by the pressing punch 22, and at the same time, the end face of the nut 15 is pressed against the metal panel 16.
The large side edge of the hammer is caulked with a caulking die 21 and fixed to the metal panel 16.

Effects of the Invention As described above, according to the present invention, the press punch 22 and the nut holder 23 are attached to the press ram 26 by coaxially fitting with the member 27, so that the nut of the press punch 22 No eccentric load is generated due to the pressing force during driving. Therefore, the vertical movement of the pressing punch 22 and the nut holder 23 is performed extremely smoothly.
Unlike conventional devices, the vertical movement of the nut holder is not obstructed and the nut cannot be fed.

Moreover, by employing the above configuration, the entire device can be made compact, and there is also an effect that the device can be downsized.

Note that, as in the embodiment, the press punch 22 is configured to be able to be displaced in the axial direction by a small distance, so that the nut is kept in a stopped state under normal conditions, and the nut can be fed only during the nut driving operation. Providing a temporary nut feeding stop mechanism can reliably prevent the nut from being driven dry, and is extremely effective in actual use.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of essential parts of an automatic pierce nut assembly device according to the present invention, and FIG. 2 is a sectional view taken along line 2-2 in FIG. 1.
FIG. 3 is a longitudinal sectional front view of the main part of the same operating state, and FIG. 4 is a longitudinal sectional front view of the main part of the conventional device. 21... Caulking die 22... Pressing punch 23.
... Nut holder 24 ... Vertical hole 25 ... Nut supply hole 26 ... Press ram 27 ... Mounting is done by parts
28...Back plate 29...Sleeve 3
3... Spring 40... Air cylinder patent applicant Shinjo Manufacturing Co., Ltd. Figure 4 Figure 4

Claims (3)

[Claims] (1) A caulking die on which the metal panel is placed, a pressing punch placed opposite to the die, a vertical hole through which the pressing punch is slidably inserted vertically, and a nut supply hole perpendicular to the vertical hole are bored. A nut holder; and a mounting member for the pressing punch and the nut holder relative to the press ram, the nut holder being mounted to the mounting member so as to be slidable in a vertical direction within a certain range, and being attached downwardly by a spring means. The pressing punch is coaxially fitted into the nut holder and connected to the mounting member, and the nut holder moves up and down together with the pressing punch in conjunction with the press ram. and an automatic pierce nut assembly device configured to move up and down relative to the pressing punch. (2) The pressing punch is connected to the mounting member so as to be able to move up and down in the axial direction by a small distance, and when the pressing punch is displaced downward, the end of the nut supply hole of the nut holder opens. The automatic pierce nut assembly device according to claim 1, wherein the pierce nut automatic assembly device is configured to always close the pierce nut. (3) The pressing punch is always biased to be displaced downward with respect to the mounting member, and the pressing punch is displaced upward in response to a work signal transmitted in conjunction with the press ram. An automatic pierce nut assembling device according to claim 2, which is configured as follows.