JPH0243614Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention relates to a cutter changing device, and is particularly suitable for replacing large disc-shaped cutters used for finishing the end faces of rolled strips, thick plates, etc. It is suitable.

<Prior Art> One method for trimming both end faces in the width direction of a rolled strip is to cut the end faces using a side cutter device. This involves installing a side cutter device on both sides of the strip in the width direction, and attaching a large disk-shaped milling cutter to the vertically supported spindle. Both end faces are cut. By the way, this cutter needs to be replaced frequently due to wear of the cutting edge or changes in the strip width, but in the past, special replacement devices have not been provided for replacing this type of large cutter. Instead, the cutters were replaced manually using a general-purpose lifting device such as a chain block.

<Problems to be solved by the invention> When changing the cutter manually using a general-purpose lifting device, there is a risk of the cutter hitting an obstacle and damaging the cutting blade.
Because it is large (600 to 1200 mm), it is not only dangerous to handle, but also requires a long time to replace the cutter.

The present invention aims to solve these problems by providing a cutter changing device that prevents damage to the cutter when changing the cutter, relieves the worker from dangerous work, and reduces the time required to change the cutter. The purpose is to shorten the time.

<Means for Solving the Problems> To achieve this purpose, the cutter changing device according to the present invention has a structure including a T-bar rotatably supported by the body and a T-bar to which the cutter is attached at the center of rotation. A driveshaft is provided with a rectangular recess into which a rectangular head is fitted, and a cam groove around the recess whose distance from the center of rotation gradually changes depending on the angular position; a motor that is dynamically driven; a plurality of cam followers that are slidably fitted into the cam grooves; and a plurality of cam followers that are supported by the body so as to be movable in a radial direction around a rotation center axis of the drive shaft, and each of which is connected to the cam followers. The device is characterized by comprising a plurality of nail plates for gripping the cutter.

<Operation> When the drive shaft is rotationally driven by the motor, the cam follower relatively slides within the cam groove, thereby moving the plurality of nail plates in the radial direction to grip or release the cutter. At the same time, the recess is rotated, and the head of the T-bar fitted into the recess is rotated.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 3. FIG. 1 is a cross-sectional view of a cutter changing device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view along the line taken from FIG.

As shown in FIG. 1, the cutter 12, which is the object of the cutter changing device 11 according to the present embodiment, has a flange 12a protruding from its upper surface, and a nail plate 29 of the cutter changing device 11, which will be described later The cutter 12 is gripped by engaging from the outer circumferential direction. The cutter 12 is attached to the spindle 13 by a T-bar 14 having a rectangular hole bored in the center of the cutter 12 and a square bulging head 14a formed at its tip to engage with the square hole. The cutter 12 is fixed to the end surface of the spindle 13 by inserting the head 14a of the T-bar 14 into the rectangular hole of the cutter 12 and pulling the T-bar 14 with their relative rotational positions changed. I'm starting to do that. In other words, Katsuta 12
To remove it from the spindle 13, rotate the T-bar 14 with the T-bar 14 loosened to align the head 14a of the T-bar 14 with the square hole of the cutter 12, and then remove the cutter 12 from its position. Pull out in the axial direction. Therefore, the present cutter changing device 11
has a mechanism for rotating the head 14a of the T-bar 14 for attaching the cutter, and a mechanism for engaging with the flange 12a of the cutter 12 and gripping the cutter 12.

As shown in FIGS. 1 and 2, a drive shaft 19 is rotatably supported on the body 15 via a conical roller bearing 17 and a ball bearing 18 fixed by a chrysanthemum-shaped nut 16. A geared motor 21 is coaxially fixed to the body 15 of the body 15 via a distance plate 20, and the drive shaft of the geared motor 21 and the drive shaft 19 are connected via a torque limit coupling 22. The shaft 19 is rotatably driven within a predetermined angular range. Drive shaft 1
The lower part of the T-bar 9 has a disc shape, and a square recess 19a into which the head 14a of the T-bar 14 described above can fit is provided in the rotational center of the lower surface, and three recesses are provided around it. A cam groove 19b is recessed. Each of the cam grooves 19b has a spiral shape in which the distance from the center of rotation gradually changes depending on the angular position.
On the other hand, a guide plate 23 is fixed to the lower surface of the body 15 together with a lower plate 24 by bolts 25. On the upper surface of the guide plate 23, three guide plates are provided equidistantly in the circumferential direction around the rotation center of the drive shaft 19. A slide plate 26 is attached to each of the two guide grooves so as to be slidable in the radial direction. A cam follower 27 is fixed to the upper surface of each of these slide plates 26, and each cam follower 27 is slidably fitted into the cam groove 19b of the drive shaft 19. In addition, on the lower surface of the slide plate 26, there are connecting rods 2, respectively.
8 is fixed, and the connecting rod 28 passes through a long hole drilled in the guide plate 23 to reach its lower surface, where it is fixed to a nail plate 29. Therefore, when the drive shaft 19 is rotated by the geared motor 21, the cam follower 27
slide plate 26 and nail plate 29 relative to each other in the cam groove 19b.
moves in the radial direction, which is the driveshaft 1
The nail plate 29 makes one stroke while the nail plate 9 rotates 90 degrees.

Furthermore, the body 15 has a limit switch 3.
0 and a limit device 31 for operating the limit switch 30 thereof, and a dog 32 for operating the limit switch 30 via the limit device 31 at a predetermined rotation angle position is fixed on the upper surface of the drive shaft 19.

On the other hand, as shown in FIG. 3, the body 15 is mounted on a moving carriage 34 by means of a fitting bar 33, and the moving carriage 34 is suspended between the spindle 13 to which the cutter 12 is attached and a stand 35 for the cutter 12. It is designed to be able to move on rails 36. Furthermore, the movable trolley 34 is provided with a mechanism for moving the body 15 up and down.
5 can be moved up and down.

In the cutter changing device 11 having such a configuration, first, when attaching the cutter 12 on the cutter holder 35 to the spindle 13, the movable cart 34 is positioned at the cutter holder 35, and the geared motor 21 is sequentially rotated. By moving each nail plate 29 toward the center, each nail plate 2
9 on the flange 12a of the cutter 12 and remove the cutter 1.
Grasp 2. At this time, drive shaft 19
The upper dog 32 operates the limit switch 30,
The grip is confirmed. Next, the body 15 is raised by the moving cart 34 and moved to the spindle 13, and the square hole of the cutter 12 is inserted into the head 14a of the T-bar 14, while the body 15 is lowered and the cutter 12 is moved to the spindle 13. Put it on top. At this time, the direction of the square hole of the cutter 12, T
The mutual positional relationship is set in advance so that the direction of the head 14a of the bar 14 and the direction of the rectangular recess 19a of the drab shaft 19 match. The recess 19 of the drive shaft 19 passes through the hole.
Insert into a. Next, when the geared motor 21 is rotated 90 degrees in the opposite direction, the T-bar 14 rotates 90 degrees as the drive shaft 19 rotates.
Each nail plate 29 retreats toward the outer circumference, and the grip of the cutter 12 by the nail plate 29 is released. Thereafter, the body 15 is raised to move the movable cart 34 to a predetermined position, while the T-bar 14
By retracting the cutter 12, the spindle 13
Fixed.

Further, the removal of the cutter 12 is performed in the reverse order as described above, and automatic replacement of the cutter 12 is accomplished by these steps. In this embodiment, the geared motor 21
The rotation range is 90 degrees, and in order to regulate this angle, a limit switch 30 for limiting rotation and a torque limit coupling 22 for limiting torque are used to prevent excessive rotation due to the inertia of the geared motor 21. It will be done.

<Effects of the Invention> As described above in detail with reference to one embodiment, according to the present invention, it is possible to automate the replacement work of large cutters in a strip side cutter device, etc., and to prevent damage to the cutters when replacing the cutters. It is possible to prevent this, relieve the worker from dangerous work, and shorten the time required to replace the cutter.
Furthermore, simply by rotating the drive shaft, the T-bar can be rotated and the cutter can be gripped and released at the same time, so the drive mechanism can be simplified and the drive shaft can be simply monitored. Since it is possible to guarantee the gripping action, the interlock can be simplified, and an inexpensive and reliable cutter changing device can be provided.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional view of a cutter changing device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of FIG. FIG. 3 is an explanatory diagram of the operation of the cutter exchange device. In the drawing, 12 is a cutter, 14 is a T-bar, 14a
15 is a T-bar head, 15 is a body, 19 is a drive shaft, 19a is a recess, 19b is a cam groove, 21 is a geared motor, 27 is a cam follower, and 29 is a nail plate.

Claims (1)

[Scope of utility model registration request] A rectangular recess into which the rectangular head of the T-bar, which is rotatably supported by the body and has a cutter attached to its center of rotation, is fitted, and a distance from the center of rotation depending on the angular position around the recess. a drive shaft provided with a cam mechanism that gradually changes the rotation angle of the drive shaft; a motor that rotates the drive shaft at a predetermined angle; a plurality of cam followers that are slidably fitted into the cam grooves; 1. A cutter changing device comprising a plurality of cutter gripping nail plates supported so as to be movable in a radial direction around a dynamic center axis and each connected to the cam follower.