JPS5813289B2 - Shearing machine cutting blade retention mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting blade holding mechanism in a shearing machine that is composed of a flat upper blade and a cylindrical lower blade, and performs a cutting operation by the intersecting movement of the upper blade and the lower blade.

Generally, what is required of this type of device is firstly the accuracy of the cutting surface, and secondly the speed of replacing the cutting blade.

Conventionally, the cutting mechanism of this type of device consists of flat blades for both the upper and lower blades, and there have been some problems with the precision and beauty of the cut surfaces.

Therefore, in order to overcome this drawback, a so-called constrained cutting type shearing machine using a cylindrical blade as the lower blade has recently been developed.

As shown in FIGS. 1 and 2, the cutting mechanism includes a cylindrical lower blade 2 fixedly held on a lower blade holder 4 fixed to the device main body 6 via a lower blade cap 3; It consists of a flat upper blade 1 that is arranged to reciprocate in the vertical direction, and the cutting operation is performed by the intersecting movement of the upper blade 1 and the lower blade 2.

To further explain the cutting method with reference to FIG. 1, first, the cutting length of the workpiece 5 that protrudes through the through hole 2a of the cylindrical lower blade 2 is determined by an appropriate dimension determining means (not shown). (see Fig. 1a), and then lower the upper side 1 vertically downward to cut the workpiece 5a of a predetermined size protruding from the cylindrical lower blade 2.
(see Figure 1b).

According to such a restraint cutting method, the material to be cut 5 is securely fixed and held within the through hole 2a of the cylindrical lower blade 2, so there is no spring up of the material to be cut 5 even during cutting. The cutting surface does not shift due to the shearing force of the upper blade 1, and a highly accurate cutting surface is obtained, and as a result, the above-mentioned conventional drawbacks are eliminated.

However, due to the structure of this type of device, as shown in Figure 2, the installation space for the cutting mechanism is extremely narrow, and the cutting blade (especially
It takes time to replace the lower blade 2), and improvements are desired.

The lower blade 2 is fixedly held by the lower blade cap 3 via a plurality of bolt means 7 to the lower blade holder 4 fixed to the main body 6, and as described above, the operation Since the space is narrow, it takes time to remove and attach the bolt means 7 and the lower blade cap 3, and to replace the lower blade 2.

In particular, since the cap 3 and the lower blade 2 are heavy, replacing them is extremely difficult.

For example, multiple workers are required to handle the cap 3, and the lower blade 2 is replaced using a crane or the like (not shown). The main body 6 located at this position becomes an obstacle, and since the lower blade holder 4 is of a fixed type, it is difficult to operate the crane.

The present invention has been made in view of the above-mentioned drawbacks of the conventional art, and has been made to improve and eliminate these drawbacks, namely, to provide a cutting blade holding mechanism that allows the cutting blade of a shearing machine to be replaced easily and quickly.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the structure of the present invention shown in the drawings will be described in detail as follows.

In FIGS. 3 to 6, 8 is a cap for fixing and holding the cylindrical lower blade 2 to the lower blade holder 9, and this cap 8
One side end is a cap support part 1 provided at a predetermined location of the main body 60.
4 through a pivot 15 so that it can be opened and closed (in the direction of arrow a in FIG. A locking groove 8c for the locking member 11 is provided, and the locking operation between these grooves 8a and 8c and a tightening means consisting of a tightening bolt 10, a locking member 11, and a nut 12 allows the lower blade 2 to be Enables tightening and fixing.

The lower blade holder 9 is disposed on a lower blade holder holder 17 provided on the main body 6, and the lower blade holder 9 can be pulled out in the forward direction of the main body 6 (in the direction of arrow e in FIG. 6).

This pulling-out operation is performed by sliding engagement between a rail member 9a provided on the lower side of the lower blade holder 9 and a rail groove 6a provided in the holder holder 17.

Therefore, the above-mentioned drawing operation is relatively easy.

Further, grooves 8b and 9b having an arcuate cross section are formed in the lower side of the cap 8 and the upper side of the pedestal 9, respectively, and the curvature of the grooves is the same as the curvature of the outer periphery of the lower blade 2.

One end of the tightening bolt 10 is pivotally attached to a predetermined position of the pedestal holding part 17 (that is, the position where the bolt 10 is vertical when the lower blade 2 is tightened and fixed) via the pivot shaft 13, and the other end, that is, the tip A screw thread 10a is formed.

The locking member 11 has a curved lower surface, and its curvature is the same as the curvature of the locking groove 8c of the cap 8.

Further, a through hole 11a for the bolt 10 is bored in the longitudinal center of the locking member 11.

16 is a spring washer.

In the above configuration, there is no fixing means for the lower blade holder 9, but as mentioned above, the groove 8b of the cap 8, the groove 9b of the lower blade holder 9, and the curvature of the outer circumference of the cylindrical lower blade 2 are all the same. The cap 8, the cylindrical lower blade 2, and the lower blade holder 9 are integrally tightened and fixed by the tightening operations of the tightening means 10, 11, and 12, so that the lower blade 2 can be held securely. (See Figure 4).

That is, during the tightening operation by the tightening means 10, 11, and 12, for example, the position of the lower blade holder 9 on which the lower blade 2 is placed is slightly left or right (the fourth position) from the proper tightening position (the position in FIG. 4). ) in the figure, a slight gap will be created between the cap 8 and the lower blade 2 placed on the lower blade holder 9, but as the tightening operation progresses, this tightening force will When the lower blade holder 9 slides in the direction in which the gap is reduced by the pressing force of the cap 8 (that is, toward the proper tightening position), and the lower blade holder 9 is finally located at the proper tightening position. There is no gap between the cap 8 and the lower blade 2, so that the cap 8, the lower blade 2, and the lower blade holder 9 are integrally tightened and fixed.

Next, a procedure for replacing the lower blade of the cutting blade holding mechanism according to the present invention will be explained.

First, in FIG. 4, the nuts 12 of the tightening means 10, 11, and 12 are loosened to release the fastened state by the locking member 11, and the bolt 10 is pushed down in the direction of arrow b.

Next, move the cap 8 released from the tightened fixed state to the arrow a
direction, and support it by appropriate means at the position indicated by the dashed-dotted line.

Incidentally, since one end of the cap 8 is pivotally supported by the pivot 15, the opening operation requires less load on the operator and does not require a plurality of operators as in the conventional case.

Next, the lower blade holder 9 on which the lower blade 2 is mounted is moved to the front (sixth
(see figure, direction of arrow C).

Then, the lower blade 2 is released from the narrow installation space of the cutting mechanism, so the upper part of the main body 6 does not become an obstacle to the replacement work of the lower blade 2 using a crane or the like, and the lower blade 2 can be replaced very smoothly.

When the replacement work of the lower blade 2 is completed, the operation described above is performed in reverse.

That is, push the lower blade holder 9 on which the lower blade 2 is placed into the tightened and fixed position, close the cap 2 (in the opposite direction of the arrow a in FIG. 4) to cover the lower blade 2, and then raise the bolt 10. Then, after fitting the locking member 11 into the locking groove 8c of the cap 8, the nut 12 is finally fitted.
Tighten to complete the lower blade replacement work.

Incidentally, as mentioned above, even if the tightening means 10, 11 and 12
Even if the position of the lower blade holder 9 deviates slightly from the proper tightening position during the tightening operation, the tightening operation slides and corrects the position to the appropriate position, so the lower blade 2 can be reliably tightened. Fixed retention is ensured.

Although the configuration of the present invention has been described above with reference to the embodiments shown in the drawings, the cutting blade holder groove according to the present invention is not limited to the above embodiments, and various modifications may be made without departing from the technical scope of the present invention. Needless to say, modifications are possible.

As explained above, the present invention includes a cylindrical lower blade that protrudes through and restrains the material to be cut, and a cylindrical lower blade that is driven up and down while in contact with one end of the cylindrical lower blade, and the material that protrudes from the cylindrical lower blade. In a shearing machine consisting of a flat upper blade that cooperates with the cylindrical lower blade to perform shearing, a lower blade holder having a groove on the upper surface into which the lower half of the cylindrical lower blade can be horizontally fitted and mounted is mounted on the main body. A lower blade cap is placed on the lower blade holder holder through a rail means so as to be removable in the front and back directions of the main body, and has a groove on the lower surface for fitting and pressing the upper half of the cylindrical lower blade. The rear end of the cap is pivoted to the rear of the lower blade holder holder of the main body so that it can be opened and closed vertically facing the lower blade holder pushed to the rear end position of the lower blade holder holder. In addition, the tightening bolt that engages and tightens the front end of the lower blade cap when it is folded and closed can be rotated up and down.
The lower end of the bolt is pivotally attached to the front of the lower blade holder holding part of the main body, so when replacing the lower blade, loosen the front tightening bolt, let it fall down, and then open the cap by raising it backwards. The lower blade can be pulled out to the front along with the lower blade holder, removed from the upper blade position, and easily suspended and transported using a crane, etc.
Place the new lower blade together with the lower blade holder on the lower blade holder holder, push it backwards using the rail as a guide, close the cap from above, and engage the tightening bolt in an upright position. The lower blade can be replaced quickly and easily.

[Brief explanation of the drawing]

Figure 1 is a sectional view to explain the cutting operation by a shearing machine,
Fig. 2 is a front view of a conventional cutting blade holding mechanism, Fig. 3 is a perspective view of a cutting blade holding mechanism according to the present invention, Fig. 4 is a front view thereof, and Fig. 5 is a perspective view showing its released state. FIG. 6 is a front view thereof. 1... Flat upper blade, 2... Cylindrical lower blade, 6... Shearing machine body, 8
...Lower blade cap, 9...Lower blade holder, 10, 11,
DESCRIPTION OF SYMBOLS 12... Tightening means, 13... Pivot, 14... Cap support part, 15... Pivot, 17... Lower blade holder holding part.

Claims (1)

[Claims] 1. A cylindrical lower blade that penetrates and protrudes to restrain and support the material to be cut, and is driven up and down while in contact with one end of this cylindrical lower blade, so that the material to be cut protruding from the cylindrical lower blade is moved in cooperation with the cylindrical lower blade. In a shearing machine consisting of a flat upper blade for shearing, a lower blade holder having a groove on the upper surface in which the lower half of the cylindrical lower blade can be horizontally fitted and mounted is attached to a lower blade holder holding part on the main body with a rail. A lower blade cap, which is placed so as to be removable in the front and rear directions of the main body through a means and has a groove on the lower surface for fitting and pressing the upper half of the cylindrical lower blade, is attached to the lower blade holder holding part of the main body. The rear end of the cap is pivoted to the rear of the lower blade holder holding part of the main body so that it can be opened and closed vertically facing the lower blade holder pushed to the rear end position, and the lower blade holder is pushed into the rear end position. The lower end of the bolt is pivoted to the front of the lower blade holder holding part of the main body so that the tightening bolt that engages and tightens the front end of the cap when it is folded and closed can be rotated up and down. A cutting blade holding mechanism of a shearing machine characterized by the following features: