JPS6229165Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] The present invention relates to a punch rotation prevention device for a riveting machine, and in particular, the invention relates to a punch rotation prevention device for a riveting machine, and in particular, the punch is mounted on the main shaft so that the central axis of the punch intersects the axis of the main shaft at the tip of the punch. In a riveting machine in which the punch tightens the rivet while making an annular turning movement, a so-called swivel movement, as the main shaft rotates, the punch itself is prevented from rotating around its axis during the tightening process. This invention relates to a punch rotation prevention device for a riveting machine.

[Prior Art] As examples of this type of technology, there are those shown in Japanese Patent Publication No. 44-3950 and Japanese Utility Model Publication No. 55-38601.

However, in the former case, a through hole is provided in the punch so as to be orthogonal to the axis of the punch, and a rod that can be engaged with a part of the frame is fitted into the through hole and fixed. The processing is extremely troublesome, such as having to make a through hole in the punch to attach the rod, and when the punch wears out, it is not easy to remove the rod from the punch and use it for another punch. Since the punches are not reused and a rod is prepared and attached to each punch, the punches have drawbacks such as being expensive.

In addition, in the latter case, a coiled hold spring is locked between the spring catch provided on the spindle holding cylinder and the punch, so a locking device is used to lock the hold spring. Since holes must be provided in the locking portions of the spring hook and the punch, the drilling process is extremely troublesome, and
If both ends of the hold spring are simply locked to each locking part, both ends of the hold spring will not come off from each locking part because both ends of the hold spring will easily come off from each locking part due to the vibration of the punch. In this way, both ends of the hold spring must be bent after being locked with each locking portion, and the locking operation is extremely troublesome.

[Purpose] The present invention was devised to eliminate these drawbacks, and can be easily and inexpensively manufactured.
To provide a punch rotation prevention device for a riveting machine that does not generate noise when a main shaft rotates.

[Embodiment] The details of a first embodiment embodying the present invention will be explained below with reference to FIGS. 1 to 3 showing the first embodiment.

A cylindrical frame 2 is attached to the upper part of the frame 1 so as to be vertically adjustable, and a holder 5 for supporting the works 3 and rivets 4 is arranged on a base 1a at the lower part of the frame 1. Said cylindrical frame 2
A main shaft cylinder 6 is vertically movably supported within the main shaft cylinder 6, and a main shaft 7 is rotatably supported within the main shaft cylinder 6. The main shaft cylinder 6 is moved up and down together with the main shaft 7 by an air cylinder (not shown) disposed above the cylindrical frame 2, and the main shaft 7 is moved up and down by an electric motor (not shown) disposed above the main shaft 7. Rotationally driven by.

A punch head 8 is attached to the lower end of the main shaft 7, and a punch 9 is detachably attached to the lower part of the punch head 8 at a slight inclination so that the axis P intersects the axis M of the main shaft 7 at the lower end. Furthermore, an engaging body 10 is provided at the bottom of the punch 9.
is removably attached. The engaging body 10 is formed into a winding and resists its own elastic force to punch the punch 9.
a winding part 11 fitted to the outer periphery of the winding part 1;
It is formed by bending a single wire material so as to have an extending part 12 extending from the upper end of the main shaft 1 in a direction away from the axis M of the main shaft 7.

A stopper member 17 is provided at the lower end of the main shaft cylinder 6.
is installed. The stopper member 17 engages with an annular body 14 fitted on the outer periphery of the main shaft cylinder 6 and an annular groove 6a formed on the outer periphery of the main shaft cylinder 6 into which the annular body 14 is screwed. A screw 13 for attaching to the main shaft cylinder 6, a stopper rod 15 whose upper end is fixed to the annular body 14 and whose lower end extends parallel to the axis M of the main shaft 7, and the stopper rod 1
The extending portion 12 of the engaging body 10 is fixed to the lower end of the engaging body 5.
The stopper piece 16 made of synthetic resin is engaged with the stopper piece 16.

However, in order to attach the engaging body 10 to the outer periphery of the punch 9, the lower end of the punch 9 is inserted into the winding part 11 from the extending part 12 side so as to be screwed in the winding direction of the winding part 11. As a result, the diameter of the winding portion 11 is expanded against its own elastic force, and the engaging body 10 is attached to the outer periphery of the punch 9.

In this way, by attaching the punch 9 to which the engaging body 10 is attached to the punch head 8,
The desired drawing process can then be started.

Now, when a start switch (not shown) is pressed, the main shaft 7 is rotated and the main shaft 7 is moved forward together with the main shaft cylinder 6. As the main shaft 7 rotates, the punch 9 is also rotated together, and the extending portion 12 of the engaging body 10 is engaged with the stopper piece 16 of the stopper member 17, thereby stopping the rotation of the punch 9.

Thereafter, the punch 9 is engaged with the upper end of the rivet 4, and after the tightening operation is performed for a predetermined period of time to tighten the rivet 4, the main shaft 7 is moved back to its original position, and the main shaft 7 is stopped.

Incidentally, after the extending portion 12 of the engaging body 10 is engaged with the stopper piece 16 of the stopper member 17, it moves along the stopper piece 16 as the main shaft 7 rotates, as indicated by the arrow T in FIG. However, since the stopper piece 16 is made of synthetic resin material, almost no frictional noise is generated between the stopper pieces 16.

Further, the spring force of the winding portion 11 of the engaging body 10 is set to be much larger than the rotational resistance force of the bearing in the punch head 8, so that the punch 9 does not easily rotate within the winding portion 11 of the engaging body 10. However, when the winding portion 11 of the engaging body 10 is wound in the same direction as the rotational direction F of the main shaft 7 and the extending portion 12 is engaged with the stopper piece 16, the winding Since the portion 11 acts to clamp the outer periphery of the punch 9 more strongly, the winding portion 1 of the engaging body 10
There is no risk that the punch 9 will rotate relative to each other within the punch 9.

In addition, in order to remove the engaging body 10 from the punch 9, first remove the punch 9 from the punch head 8, and then
The engaging body 10 can be easily removed by pulling out the punch 9 while rotating in a direction opposite to the winding direction of the winding portion 11 of the engaging body 10 . Therefore, when the processed part at the lower end of punch 9 wears out,
By removing the engaging body 10 from the punch 9 and attaching it to a new punch 9, the engaging body 10 can be used in common.

FIG. 4 shows another embodiment of the engaging body 10, in which a gripping piece 21 is attached to the lower end of the winding portion 11 of the engaging body 10 so as to intersect with the extending direction of the extending portion 12. is provided.

In order to attach this engaging body 10 to the punch 9, the punch 9 is held while gripping the extending portion 12 and the gripping piece 21 against the elastic force of the winding portion 11 so that they approach each other. By inserting the punch 9 into the winding part 11, the engaging body 10 can be easily attached to the outer periphery of the punch 9.

FIG. 5 shows yet another embodiment of the engaging body 10, in which an annular portion 31 is provided at the tip of the extending portion 12 of the engaging body 10, and the annular portion 31 is a stopper member. The extending portion 12 is engaged with the stopper pieces 16 of 17 so as not to rotate around the axis M of the main shaft 7.

[Effects] As detailed above, the present invention has an engaging body having a winding portion that fits around the outer periphery of the punch and an extending portion that engages with a non-rotatable stopper member provided on a frame or the like. The engaging body is attached to the punch by utilizing the elastic force of the winding portion, and the extending portion of the engaging body is engaged with the buffer piece of the stopper member to prevent rotation of the punch. can be easily formed by bending a single wire, and the engaging body can be easily attached to the punch without special processing on the punch, making it easy to use with conventional punches. can be installed,
Furthermore, when the punch wears out, the engaging body can be removed from the punch and attached to a new punch for reuse, and there is no need to prepare a large number of engaging bodies, making it possible to provide an extremely inexpensive device. In addition to this, it has many other effects such as not generating noise when the spindle rotates.

[Brief explanation of the drawing]

1 to 3 show the first embodiment, FIG. 1 is a right side view showing a section around the main shaft, FIG. 2 is an action explanatory view showing the action mode of the engaging body, FIG. 3 is an exploded perspective view showing the stopper member, punch, and engaging body, and FIGS. 4 and 5 are perspective views showing other embodiments of the engaging body, respectively. In the figure, 1 is a frame, 2 is a cylindrical frame, 6 is a main shaft cylinder, 7 is a main shaft, 8 is a punch head, 9 is a punch, 10 is an engaging body, 11 is a winding part, 12 is an extension part, and 17 is a stopper member It is.

Claims (1)

[Claims for Utility Model Registration] 1. A reciprocating member 6 that is slidably supported by the frames 1 and 2 and driven to reciprocate; and a reciprocating member that is rotatably supported by the reciprocating member 6 and rotationally driven. The main shaft 7 is reciprocated together with the main shaft 6, and the central axis P is the axis M of the main shaft 7 at the open end.
A punch head 8 is attached to the main shaft 7 so as to intersect with the main shaft 7.
A riveting machine is equipped with a punch 9 whose base end is attached via a riveting machine for performing a tightening process, and the stopper member is provided on the frames 1 and 2 or the reciprocating body 6 and has a buffer piece 16 at its lower part. 17; a wound portion 11 which is formed into a wound portion and is fitted onto the outer periphery of the punch 9 against its own elastic force;
The axis M of the main shaft 7 from one end of the winding part 11
The stopper member 17 extends further away from the
A punch rotation prevention device for a riveting machine, comprising an engaging body 10 formed of a single wire so as to have a buffer piece 16 and an engageable extension part 12. 2. The punch rotation prevention device for a riveting machine according to claim 1, wherein the buffer piece 16 of the stopper member 17 is made of synthetic resin.