JPS6339030Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a circular cutting machine that is used to cut a sheet-like raw material into a desired width when manufacturing tapes such as magnetic tapes. Regarding blade tools.

[Prior Art] Generally, this type of round-blade tool includes an upper blade 1 and a lower blade 2, which are used as a pair of upper and lower blades, as shown in FIGS. 6 and 7.

The upper blade 1 has a flange portion 11a at one end, as shown in FIGS. 8 and 9, for example.
A plurality of ring-shaped round blade supports 13 having a small diameter cylindrical part 13a and a large diameter flange part 13b are connected to the outer periphery of a steel shaft 11 with a tightening nut 12 screwed into the other end. At the same time, a ring-shaped cutter 14 having a cutting edge 14a is fitted into the small-diameter cylindrical portion 13a of the round blade support 13, and the ring-shaped cutter 14 and the large-diameter flange portion 1 are connected to each other.
A flat spring (elastic member) 15 is fitted between the step surface 13c on the small diameter side of the blade 3b. 13d.

On the other hand, as shown in FIG. 10, the lower blade 2 has a steel shaft 2 having a flange portion 21a at one end.
The same number of blades 22 as the ring-shaped blades 14 of the upper blade 1 are fitted onto the outer periphery of the upper blade 1, and these blades 22 are tightened and fixed with a tightening nut 23.

When using such upper blade 1 and lower blade 2 in combination, first cutter blade 1 of ring-shaped blade 14 is used.
The side surface 14b where 4a is formed and the cutting edge 2 of the cutter 22
The outer periphery of the blade 14 faces the side surface 22b on which the blade 2a is formed, and the upper blade 1 and the lower blade 2 are moved relative to each other in the axial direction to bring the side surfaces 14b and 22b into contact with each other. After the contact, a certain amount of relative movement in the axial direction is performed to apply a predetermined contact pressure to the side surface 14b and the side surface 22b.

[Problems to be solved by this invention] In the above-mentioned upper blade 1, since there is an unavoidable manufacturing error in the round blade support 13, each ring-shaped blade 14
A pitch error occurs in the cutting edge 14a. Moreover, since several dozen ring-shaped cutters 14 are installed, the pitch error becomes quite large. This also applies to the lower blade 2. Therefore, when the upper blade 1 and the lower blade 2 are combined, the contact pressure will be excessive or insufficient for each blade that comes into contact with each other. If the contact pressure is too high or too low, the cutting properties of the sheet-like original fabric will be lowered, resulting in a problem that the cut surface will be deteriorated.

Further, when the cutting edge of the upper blade 1 is ground, a force is applied to the ring-shaped cutter 14 by the grinding wheel to rotate it. This force is larger than the fixing force acting between the ring-shaped blade 14 and the round blade support 13 due to the pressing force of the flat spring 15.
Therefore, the edge of the upper blade 1 cannot be ground as it is, and it is necessary to remove the ring-shaped cutter 14 from the shaft 11, grind it, and then reassemble it. There is a problem in that a large amount of time must be spent on this removal and assembly work.

[Means for solving the problem] This invention was made in order to solve the above-mentioned problems, and it is designed to screw onto the outer periphery of the round blade support and direct the elastic member toward the ring-shaped blade. An adjustment ring to be pressed is provided.

[Example] Hereinafter, an example of this invention will be described with reference to FIGS. 1 to 5. In addition, in these figures, the same reference numerals are given to the parts having the same configuration as those of the conventional example, and the explanation thereof will be omitted.

Figures 1 and 2 show the upper blade 3 related to this consideration.
Fig. 1 is a half-sectional view, and Fig. 2 is a half-sectional view.
The figure is an enlarged view of the arrowed part in FIG. The upper blade 3 shown in these figures has the same configuration as the conventional upper blade 1 except that an adjustment ring is provided between the round blade support 13 and the countersunk spring 15, so only the differences will be described below. Explain.

In FIG. 2, the stepped surface 13 of the round blade support 13
A ring-shaped adjustment ring 31 is interposed between the spring 15 and the spring 15. This adjustment ring 31 is
The internal threaded part 31a is formed on the inner peripheral surface of the flange part 13b, and the external threaded part 13e is formed on the outer peripheral surface of the flange part 13b.
The spring 15 is screwed onto the spring 15, and rotates to move in the axial direction, thereby adjusting the amount of contraction of the spring 15.

In this way, in the above embodiment, since the amount of contraction of the flat spring 15 can be adjusted using the adjustment ring 31, the pressing force of the flat spring 15 can be adjusted for each flat spring 15, and the The contact pressure can be adjusted for each blade. Therefore, even if there is an excess or deficiency in the contact pressure for each blade due to the pitch error of the cutting blade, the contact pressure can be set to an appropriate value for each blade by individually adjusting the pressing force of the counter spring 15. can. As a result, it is possible to prevent deterioration in the machinability of the sheet material and prevent deterioration of the cut surface. Of course, even if there is variation in the pressing force of each flat spring 15, the pressing force of the flat spring 15 against the ring-shaped cutter 14 can be individually adjusted and set to an appropriate value.

Also, depending on the amount of offset between the opposing blades, the contact angle between the opposing blades, that is, the side surface 14b of the ring-shaped blade 14 and the side surface 22b of the blade 22
However, by adjusting the pressing force of the flat spring 15 using the adjustment ring 31, only the contact pressure can be changed without changing the contact angle. Conversely, without changing the contact pressure determined by the amount of offset between the opposing blades,
The adjustment ring 31 can also change the contact angle between the blades.

Furthermore, the adjustment ring 31 allows the flat spring 1
By increasing the pressing force of 5 and increasing the fixing force of the ring-shaped cutter 14, it becomes possible to re-grind as is, and therefore, the effort of attaching and detaching the ring-shaped cutter 14 from the shaft 11 during re-grinding is greatly reduced. Ru.

In addition, since the ring-shaped cutter 14 can be ground while being attached to the shaft 11, the accuracy of the outer periphery of the ring-shaped cutter can be improved compared to the case where the ring-shaped cutter is attached to a grinding jig, ground, and then reattached to the shaft 11. High accuracy can be maintained without deterioration.

Further, as examples of the present invention, there are the following in addition to the above-mentioned examples. In the following embodiments, only points different from the above embodiments will be explained, and similar parts will be denoted by the same reference numerals and their explanations will be omitted.

The upper blade 4 shown in FIG.
A tapered surface 41 is formed which slopes from the inside in the radial direction to the outside as the blade is separated from the ring, and between this taper surface 41 and the ring-shaped cutter 14,
A ring-shaped elastic member 42 made of a rubber O-ring, a ring-shaped coil spring, hard rubber, etc. is interposed therebetween.

The upper blade 5 shown in FIG.
3a is provided with a threaded portion 52, and the two are screwed together.

The upper blade 6 shown in FIG. 5 has a ring-shaped cutter 14 fitted into a small-diameter cylindrical portion 13a of a round-blade support 13, and a large-diameter end surface 13d of the round-blade support 13 adjacent to the ring-shaped cutter 14. A flat spring 15 is fitted between the two, and an adjustment ring 31 is interposed between the flat spring 15 and the large diameter side end surface.

In the above embodiment, a flat spring 15 is used as the elastic member, but there is no need to limit it to this, and an elastic member such as a coil spring or rubber may be used.

[Effect of the invention] As explained above, according to this invention, since the adjustment ring is provided which is screwed onto the outer periphery of the round blade support and presses the elastic member toward the ring-shaped blade side, the elastic member It is possible to individually adjust the pressing force between the blades, and therefore the contact pressure between the blades can be adjusted for each blade, setting it to an appropriate value, and changing the contact angle between the opposing blades. The effect is that the contact pressure can be changed without changing the contact pressure, and the contact angle can be changed without changing the contact pressure.In addition, it is possible to re-grind as it is, and the ring-shaped cutter can be used on the shaft for re-grinding. It is possible to reduce the effort required to attach and detach the ring-shaped cutter, and since the ring-shaped cutter can be used for cutting as is after being ground, the outer periphery deflection accuracy of the ring-shaped cutter can be maintained at a high level.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention, FIG. 1 is a half sectional view thereof, FIG. 2 is an enlarged view of the arrowed part in FIG. 1, and FIG. 3 is an embodiment of the present invention. FIG. 2 is a sectional view showing a main part of one of the embodiments;
FIG. 4 is a cross-sectional view showing the main parts of one of the other embodiments of the present invention, and FIG. 5 is a cross-sectional view showing the main parts of one of the other embodiments of the present invention. Figures 6 and 7 show a conventional round-blade tool, with Figure 6 being a plan view thereof, Figure 7 being a front view thereof, and Figures 8 and 9 showing a conventional upper blade tool. FIG. 8 is a half sectional view thereof, FIG. 9 is an enlarged view of the arrowed portion in FIG. 8, and FIG. 10 is a view showing a conventional lower blade. 11...Shaft, 13...Round blade support, 13
a... Cylindrical part, 13b... Flange part, 13c...
...Stepped surface, 14... Ring-shaped cutter, 15... Flat spring (elastic member), 31... Adjustment ring, 42...
...Elastic member.

Claims (1)

[Scope of utility model registration request] A plurality of ring-shaped round blade supports having a small-diameter cylindrical portion and a large-diameter flange portion connected in the axial direction are sequentially fitted onto the outer periphery of the shaft so as to face the same direction, and the small-diameter cylindrical A round blade tool comprising a ring-shaped cutter and an elastic member that presses the ring-shaped cutter in the axial direction, the elastic member being screwed onto the outer periphery of the round blade support so that the elastic member is attached to the ring-shaped cutter. A round blade tool characterized by having an adjustment ring that presses toward the side.