JPH0811089A - Rotary sheet cutter - Google Patents

Abstract

PURPOSE:To facilitate the adjustment of mutual edge tip positions of a rotary edge and a fixed edge by making a support shaft supporting the rotary edge at both ends eccentric at a portion where it is fitted in a side plate and at a portion where it is fitted in an end of the rotary edge. CONSTITUTION:A fixed edge 1 is supported on side plates 3a, 3b by a fixed edge support shaft 2 at both ends, and its edge tip 1a is energized by a spring 4 toward a rotary edge 6 to come into pressure-contact with the rotary edge 6. The rotary edge 6 is supported on the side plates 3a, 3b by support shafts 7, 8 at both ends in the same way as the fixed edge 1. The support shaft 7 forms a portion fitted in the side plate 3a as a support shaft rotary portion 7a and a portion fixed on a main body of the rotary edge by making it eccentric for the support shaft rotary portion 7a as a support shaft fixed portion 7b. An eccentric shaft 7 of the rotary edge 6 is rotated so that an edge tip position of the rotary edge 6 becomes proper for an edge tip position of the fixed edge 1. Thus, it is possible to simplify a structure of a rotary sheet cutter while allowing errors in dimension and shape by creating such structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet cutting device which is mounted on a recording device such as a copying machine, a printer or a facsimile and mainly cuts a recording sheet wound in a roll into an arbitrary length. Is.

[0002]

2. Description of the Related Art A sheet cutting device is provided with a shear angle and a biting angle in the same manner as ordinary manual scissors in order to reduce a load at the time of cutting, and a cutting edge line of a rotary blade (movable blade) and a fixed blade. The sheets are cross-pressed and meshed at one point, and the sheet is gradually cut from one end to the other end. As a sheet cutting device mounted on a recording device such as a copying machine, a printer, and a facsimile, a rotary blade having a rotary shaft substantially parallel to a feed roller for a sheet to be cut because of the small size and light weight of the device. A rotary type sheet cutting device, which is composed of a fixed blade that presses the blade tip against it, is widely used.

In a rotary type sheet cutting apparatus, in order to surely press the rotary blade and the blade tips of the fixed blade into mesh with each other, both ends of the fixed blade described in Japanese Utility Model Publication No. 54-6411 are rotatably supported. , Whose blade edge is pressed against a movable blade by a spring, and Jitsuko Sho-26789
It is known that both ends of a fixed blade are fixed and the blade edges are pressed against each other by elastic bending of the blade itself, as described in Japanese Patent Publication No. 2003-242242.

[0004]

In any of the above-mentioned rotary type sheet cutting apparatuses which have been frequently used, the accuracy of the relative positions of the blade edges of the rotary blade and the fixed blade is as follows.
This is an essential condition for stable cutting. For this reason, in the cutting device having the structure in which both ends of the fixed blade are axially supported as described in Japanese Utility Model Publication No. 54-6411, the blades of the fixed blade are securely pressed and meshed with each other. At least one of them is moved in the pressure contact direction to adjust its position. Furthermore, the actual public Sho 58-26
In a cutting device having a structure in which both ends of a fixed blade described in Japanese Patent No. 789 are fixed and the cutting edges are pressed into contact with each other by elastic bending of a blade material to be engaged with each other, the fixed blade is fixed to both side plates for holding a rotary blade. It is necessary to strictly adjust the cutting edge position of
The number of component parts was large, and delicate adjustment work was required. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional rotary sheet cutting apparatus, and an object thereof is to provide a cutting apparatus in which the positions of the cutting edges of the rotary blade and the fixed blade can be easily adjusted.

[0005]

The inventor of the present application has solved the above-mentioned problems and is a rotary type in which the size is small, the number of components is small, and the relationship between the positions of the blade edges of the rotary blade and the fixed blade is easy to adjust. It was made as a result of various studies for the purpose of providing a sheet cutting device. That is, specifically, the first invention of the present invention comprises a fixed blade having a substantially straight blade edge, a rotary blade whose both ends are rotatably supported, and a support shaft which supports the rotary blade at both ends, At least one of the support shafts is eccentric between the portion fitted into the side plate and the portion fitted into the end portion of the rotary blade, and the blade tip position of the rotary blade with respect to the blade tip of the fixed blade can be adjusted. A characteristic is a rotary type sheet cutting device, and the second invention is
The fixed-type blade cutting apparatus according to the first aspect of the invention is characterized in that the fixed blade has a structure in which a side plate supporting the rotary blade and a portion other than the side plate are integrated. In the present invention, at least one of the spindles of the rotary blade is used as an eccentric shaft, and a rotary-type sheet cutting device having a major feature in having a structure in which the position of the blade edge of the rotary blade with respect to the blade edge of the fixed blade is adjustable is proposed. It is a thing.

In the conventional rotary sheet cutting apparatus, since the positional relationship between the side plates on both sides which pivotally support the rotary blade and the blade edges of the rotary blade is constant, the relative position between the side plate and the fixed blade may be adjusted. Although necessary, according to the present invention, it is possible to adjust the positions of the blade tip of the rotary blade and the side plate. Therefore, some error is allowed in the relative position between the fixed blade and the side plate, and it is not necessary to have a structure capable of adjusting the positions of the fixed blade and the side plate. In the sheet cutting apparatus of the present invention, since the support shaft that supports the rotary blade is the eccentric shaft, when the rotary blade is operated, the blade edge of the rotary blade rotates in the shearing direction, that is, in the circumferential direction of the blade tip circle. With
In the pressing direction of the blade edges of the fixed blade and the rotary blade, that is, in the radial direction of the blade edge locus circle of the rotary blade, the blade rotates in a swinging manner. That is, both rotation and revolution are performed.
The term “substantially straight” as used in the present invention means that the fixed blade and the movable blade are straight when they are not meshed with each other, that is, in a free state.

[0007]

In the rotary sheet cutting apparatus of the present invention, adjustment is performed by rotating the eccentric shaft of the rotary blade so that the blade tip position of the rotary blade is at an appropriate position with respect to the blade tip position of the fixed blade. , The mutual position is set to an appropriate position in the radial direction of the circle of the blade edges of the rotary blades, that is, in the pressing direction of the blade edges. If this happens, there will be some variation in position in the circumferential direction of the cutting edge trajectory circle, but since the cutting edges originally have an inclination to give a shear angle in this direction, the cutting edge position in the radial direction will change. The adjustment of is nothing but the correction of the error, and the variation in the circumferential direction caused by this is of course about the same, and can be set within a negligible range in view of the characteristics of the device.

As described above, since the support shafts provided at both ends of the rotary blade in the rotary type sheet cutting apparatus are indispensable parts, even if the support shafts are eccentric to each other, it is not possible to add new parts. There is no increase in the number of parts. In the rotary sheet cutting apparatus of the present invention, since the fixed blade and the side plate do not need to have a structure capable of adjusting the relative position, the fixed blade and the side plate are inexpensive and efficient such as rivets and welding. It may be assembled integrally with the cutting device so that the position of the fixed blade cannot be adjusted in the process of assembling the cutting device. Alternatively, it is possible to adopt a structure in which the fixed blade and the side plate holding the rotary blade are integrally molded parts.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments and drawings. 1A and 1B show an embodiment of a rotary sheet cutting apparatus according to the present invention. FIG. 1A is a perspective view (partially cutaway view), and FIG. 1B is an exploded view showing the structure of a rotary blade shaft.
The fixed blade 1 has side plates 3a, 3
It is supported by b, and its blade edge 1a is urged toward the rotary blade 6 by a spring 4 to press it. The rotary blade 6 is supported by the side plates 3a and 3b in the same manner as the fixed blade 1 by the support shafts 7 and 8 at both ends. The support shaft 7 has a support shaft rotating portion 7a as a portion fitted into the side plate 3a, and a support shaft fixing portion 7b as a portion which is eccentric with respect to 7a and fixed to the rotary blade body. Since the fixed blade edge 1a and the rotary blade edge 6a must be arranged in parallel or in some interference with each other in the pressure contact direction, the support shaft 7 is rotated with respect to the rotary blade 6, and these are properly adjusted. It is fixed integrally with the rotary blade 6 by the set screw 9 so as to be in such a position.

According to the present invention, it is not necessary to process each component constituting the apparatus with high accuracy so that the positional accuracy of the cutting edge is automatically maintained and maintain the accuracy, and the position of the fixed blade is fixed. No adjustment mechanism is required. In an apparatus for cutting a sheet of A4 to B4 size (width 200 mm to 300 mm) which is generally used in a copying machine, a printer, etc., the error in the position of the blade edge, that is, the variation in cutting of the paper is 0.
It is required to be 1 mm or less. Therefore, unless the dimensions of the parts that are related to the position of the cutting edge are machined to an accuracy of about 0.01 mm or less, this accuracy cannot be maintained without adjustment. The adjusting mechanism only needs to be able to correct the error in the position of the cutting edge. For that purpose, the eccentric amount between the spindle rotating portion 7a and the spindle fixing portion 7b is adjusted so that the position of the blade can be adjusted by about 0.5 mm. , About 0.25 mm is sufficient.

Since a shearing angle of about 1 degree is usually given to a cutting device of this size, the step difference on the left and right due to the inclination of the cutting edge is about 3.5 mm to 5 mm, and when the cutting edge position by the eccentric shaft 7 is adjusted. Even if there is variation in the shear angle direction caused by
Since it does not exceed m, the fluctuation is in a range that does not cause a problem in the characteristics of the cutting device. In general, if the shear angle is insufficient, the shearing force is increased, and the insufficient driving force is likely to cause cutting problems. Therefore, if there is such a concern, it is desirable to set the shearing angle to a slightly larger value in advance.
The eccentric shaft allows the one fitted into the side plate to rotate,
Although the one fitted into the rotary blade is fixed to the rotary blade, the same operation can be performed by mounting the rotary blade in reverse.

FIG. 2 shows another embodiment of the rotary type sheet cutting apparatus according to the present invention. FIG. 2A is a perspective view and FIG.
B is a sectional view showing the structure of the shaft portion of the rotary blade. In this embodiment, both the fixed blade 1 and the rotary blade 6 are manufactured by bending a thin plate and have a structure in which the blade edges are pressed against each other by elastic deformation (deflection) of the blades themselves. Spindles that are inserted into the side plate 3a of the shaft 7 and are rotatably supported so that there is no gap between the cutting edges at both ends (cutting end and cutting end) and there is pressure contact with an appropriate force. By utilizing the eccentricity between the rotating portion 7a and the support shaft fixing portion 7b fixed to the rotary blade 6, the support shaft 7 is rotated with respect to the rotary blade 6 to adjust both cutting edges to appropriate positions. After the adjustment, the support shaft 7 is fixed to the rotary blade 6 with the nut 10.

According to the present invention having such a structure, the side plate, which is the support shaft holding portion of the fixed blade and the rotary blade, can be integrally formed, so that the structure of the blade as a whole is extremely simple. be able to. The support shaft may be fixed by caulking instead of using a nut. Also, an eccentric support shaft should be attached to the fixed blade side so that the fixed blade swings with respect to the rotary blade. Is also optional.

[0014]

As described above, according to the present invention, at least one of the rotary support shafts for supporting the rotary blade at both ends is eccentric, and the blade tip position of the rotary blade with respect to the blade tip of the fixed blade can be adjusted. The rotary sheet cutting device is characterized in that By using the cutting device having such a structure, it is possible to simplify the structure while allowing the size and shape errors of the components of the rotary sheet cutting device to the extent that they do not hinder mass production processing. In addition, it is easy to adjust the pressure contact force between the fixed blade and the rotary blade to an appropriate range according to the application, and especially the side plate for rotating and holding the rotary blade with both spindles is integrated with the fixed blade. In the case of a cutting device which is capable of doing this, it has the effect of significantly simplifying the structure of the device.

[Brief description of drawings]

FIG. 1 is a perspective view and an exploded view of a structure in which a fixed blade is pressed against a rotary blade by a spring according to an embodiment of a rotary sheet cutting apparatus of the present invention.

FIG. 2 is a perspective view and a cross-sectional view of a structure in which the blade edges are pressed against each other by elastic deformation of a rotary blade and a fixed blade, showing another embodiment of the rotary sheet cutting apparatus of the present invention.

[Explanation of reference numerals] 1 fixed blade, 1a fixed blade edge, 2 fixed blade support shaft, 3a
Side plate, 3b Side plate, 4 spring, 6 rotary blade, 6a rotary blade edge, 7 spindle, 7a spindle rotating part, 7b spindle fixing part, 8 spindle, 9 set screw, 10 nut

Claims (2)

[Claims] 1. A fixed blade having a substantially straight cutting edge,
A rotary blade whose both ends are rotatably supported, and a spindle supporting the rotary blade at both ends, and at least one of the spindles,
A rotary type sheet cutting device, which is eccentric between a portion fitted into a side plate and a portion fitted into an end portion of the rotary blade, and the blade tip position of the rotary blade with respect to the blade tip of the fixed blade can be adjusted. . 2. The rotary sheet cutting device according to claim 1, wherein the fixed blade has a structure in which a side plate supporting the rotary blade and a portion other than the side plate are integrated.