JPS5827050B2 - rotary cutting device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotary cutter.

For example, a device having a structure as shown in FIG. 8 has been used as a device for cutting long tape-shaped labels at high speed.

That is, a is a fixed blade and has a vertical blade, and a rotary blade is provided in contact with the fixed blade a so as to be rotatable in one direction.

Since the rotary blade is installed at a certain angle to the vertical rotary blade drum C, the rotary blade rotates in point contact with the fixed blade a, and as a result, the two blades a, The moment the tape d passes through the space b, it is cut into one sheet e.

Such conventional devices have the following drawbacks.

◇ In order to keep the two blades a and b in point contact, it takes time and skill to adjust the blades in and out.

If the adjustment is inappropriate or the rotary blade drum is biased when rotating at high speed, the blades will collide and break.

■Since the fixed blade does not move, the tape that is continuously fed at high speed is blocked from moving forward at the cutting part.

For this reason, the tape before the cutting point bends a little each time it is cut, and then returns to a straight state after the cutting is completed, which is a repeated movement, which tends to make the cutting position inaccurate, especially when the tape is fed at high speed.

The present invention was made to improve the above-mentioned drawbacks, and it is possible to cut the tape while it is moving at high speed without blocking its progress, and it also requires skill in delicately adjusting the cutting position of the blade. The purpose of the present invention is to provide a rotary cutter that does not require a human operator.

Next, an example will be described.

In FIG. 1, 1 is a driving drum, and 2 is a driven drum.

<A> Driving Drum The driving drum 1 is rotated in one direction by the driving force of the central shaft 11.

A vertical groove 12 is formed in a part of the side surface of the driving drum 1, and among the surfaces facing both walls of the groove 12, the peripheral surface meets a downstream surface 13 located particularly on the downstream side in the rotational direction. A vertical edge line is configured as a vertical blade 14.

The downstream surface 13 is formed as an arcuate surface recessed relative to the vertical groove 12.

In reality, the blade part is made of a hard material different from that of the drum, and the blade is sometimes attached to the drum 1 in a replaceable manner, but in that case, the blade protrudes from the drum surface, so the vertical groove is not necessary. Sometimes it happens.

The same applies to the inclined blades 24 and vertical grooves 22, which will be described later.

A guide claw 15 is provided protruding from the lower end of the vertical blade 14.

The downstream surface of this guide claw 15 is formed as a circular arc surface 16, and the base end of this arc surface 16 is aligned with the vertical blade 14,
As it protrudes, the arcuate surface 16 recedes toward the upstream side.

The protrusion dimension of this guide claw 15 from the surface of the drum is as follows:
The depth is shallower than the depth of the vertical groove 22 of the driven drum 2, which will be described later.

(2) Driven Drum This driven drum 2 also has vertical grooves 22 recessed in a part of its circumferential surface, and is a drum that rotates in the opposite direction to the drive drum 1.

Then, the outer edge of the upstream surface 23 located on the upstream side in the rotational direction of the wall surface forming the vertical groove 22 is formed as an inclined ridge line that gradually moves away from the center of the drum 2 as it goes downward. 24.

The upper end of this inclined blade 24 coincides with the outer circumferential surface of the drum 2, and the lower end protrudes the most from the outer circumferential surface of the drum 2. It is shorter than the depth of the longitudinal groove 12 of No. 1.

It is also possible to adopt a configuration in which the slope of the inclined blade 24 is made to protrude most at the upper end and coincide with the outer circumferential surface of the drum 2 at the lower end, contrary to the illustration of the embodiment.

The driven drum 2 is mounted on the rotary plate 3 and is rotatably fitted to a central shaft 31 at the center of the rotary plate 3, so that the rotary plate 3 receives a driving force and rotates.

As shown in FIGS. 3 and 4, one pin 32 is provided protrudingly on the surface of the rotating plate 3, and a recess 21 larger than the planar shape of the pin 32 is provided in the lower bottom surface of the driven drum 2. to fit.

In the concave portion 21, a spring 33 is interposed between the downstream end surface 25 and the pin 32 when the drum rotates twice, thereby forming a buffer mechanism.

As a result, the pin 32 is always pressed against the upstream end surface 26 of the recess 21 and rotates by the force of the rotating plate 3, but when a large external force is applied to the passive drum 2 in the rotational direction, the drum 2 contracts the spring 33 and rotates the rotating plate 3. It is possible to advance beyond 3.

Therefore, the present invention is not limited to the above-mentioned buffer structure, and any known structure in which the motion of the rotary plate 3 is transmitted to the drum 2 but allows the drum 2 to move ahead can be widely adopted.

Next, the operation will be explained.

<A> Arrangement The two drums 1 and 2 are arranged so that the rotation locus of the vertical blade 14 and the rotation locus of the point closest to the center of the drum 2 in the part of the inclined blade 24 that is actually cut are at least in contact with each other. be.

In other words, the rotation locus (curved) of the vertical blade 14 in a plan view passes through the rotation locus (curved) of the inclined blade 24 in a plan view.

Then, the tape 4 enters between the drums 1 and 2 by the driving force of the tape extrusion drum 41 from a direction substantially perpendicular to a line connecting the center axes 11° 31 of the two drums 1 and 2.

〈Guiding by the driving drum (Figures 2 and 5) Both drums 1,
Adjustment is made so that the two blades 14 and 24 rotate in contact with each other, but especially when rotating at high speed, there is a risk that the blades will collide with each other and be damaged as a result even if there is even a slight loosening of one part.

Therefore, in the drum of the present invention, a guide pawl 15 is provided protruding from the driving drum 1, and its arcuate surface 16 first comes into contact with the lower part of the inclined blade 24 (the part where no blade is actually provided).

As described above, the passive drum 2 is free to move ahead of the rotary plate 3, so if the diameter of the passive drum 2 is slightly smaller than the diameter of the driving drum 1, it will be pushed forward by the guide pawl 15.

Rushi Cutting (Figures 6 and 7) If the rotation continues, the inclined blade 24 will come into contact with the vertical blade 14, and the point of contact with the vertical blade 14 will rise as the blade rotates.

Therefore, the tape between the drums 1 and 2 is cut from the bottom to the top while moving forward at the same speed as the circumferential speed of the drums 1 and 2.

This action is similar to cutting with scissors.

Both drums 1 and 2 are provided with vertical grooves 12 and 22, and since the groove walls 13 and 23 are concave, the guide claw 1
5 and the inclined blade 24 never hit the opposing drum.

One embodiment of the present invention is as described above. For example, if the relationship between the rotary plate 3 and the buffer mechanism is provided on the driving drum 1 side in the opposite direction to that in the above embodiment, the guide pawl 15 can be The movement after the insect contacts the drum 2 can be buffered.

In addition, when the rotation direction of both drums 1 and 2 and the tape supply position are reversed from the embodiment shown in the figure, the guide pawl 15 is replaced by the inclined blade 24.
It can also be made to protrude from the line.

In short, it is sufficient that one blade is configured to slide into the other blade by means of a guide pawl protruding from either one of the drums.

As described above, the present invention forms vertical blades parallel to the central axis on the circumferential surface of one drum, and forms inclined blades inclined in a direction away from the central axis on the circumferential surface of the other drum. The rotation locus on the plan view of the vertical blade is arranged so that it overlaps with the rotation locus of the vertical blade, and before the two blades come into contact, one of the drums pushes the other drum. They are aligned and protruded, and one of the drums is provided with a shock absorber.

Therefore, the following effects can be expected.

y〉A tape that is moving at high speed can be cut while it is still running without stopping for a moment.

Even without increasing the manufacturing accuracy or adjustment accuracy of the Φ device, the blades always rub against each other accurately and the tape can be cut, preventing the blades from colliding with each other and causing damage or severe wear. do not have.

Adjustment does not require the delicate skill of a conventional artist.

<Noshi> Conventional cutting devices cut paper in the same condition regardless of its hardness or thickness.

The device of the present invention changes the elasticity of the spring of the buffer mechanism depending on the type of paper to achieve the optimum cutting ability, which can greatly reduce wear on the blade.

[Brief explanation of drawings]

Fig. 1.2: A perspective view of an embodiment of the present invention; Fig. 2: A perspective view of a state in which the rotation has advanced from the state shown in Fig. 1; Fig. 3: A plan view of the arrangement of the Ni drum; Fig. 4: A view of the shock absorbing mechanism. An explanatory diagram of one embodiment,
FIGS. 5 to 7: An explanatory diagram of a cutting state. FIG. 8: An explanatory diagram of a conventional device. 1.2 Nidram, 14: Vertical blade, 24: Inclined blade, 15:
Guidance board.

Claims (1)

[Claims] 1. Vertical blades parallel to the central axis are formed on the circumferential surface of one drum, and inclined blades that are inclined in a direction away from the central axis are formed on the circumferential surface of the other drum. The rotation trajectory on the plan view of the vertical blade is arranged so that it overlaps with the rotation trajectory of the vertical blade, and before the two blades come into contact, one of the drums has a guide pawl that pushes the other drum, and its base end is attached to one of the drums. The other drum is mounted on the driving rotary plate in a freely rotatable state to form a part that contacts the guide pawl, and also to prevent shock when it comes into contact with the guide pawl. A rotary cutting device is constructed in which a shock absorption device for absorbing the amount of heat is provided between the drive rotary plate and the drum mounted on the drive plate, and the blade guided by the guide claw slides into contact with the other blade.