JP2724971B2 - Sheet cutting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet cutting apparatus which cuts recording paper into full width or partial width by mounting it on OA equipment such as a printer.

[0002]

2. Description of the Related Art A sheet cutting apparatus for switching between full width cutting and partial cutting of a sheet according to the rotation direction of a motor is described in Japanese Patent Application Laid-Open No. 6-47696. The sheet cutting device described in the publication converts the rotation of the motor into reciprocating motion of the movable blade by a crank mechanism or a four-bar rotary chain mechanism. A special deformed hole is provided, and the length of the movable blade process is switched by moving the rotor pin or the drive pin of the movable blade to a predetermined position in the deformed hole according to the rotation direction of the motor, cutting the full width of the sheet and It is for switching between disconnection.

[0003]

The above-mentioned conventional sheet cutting apparatus needs to surely move a pin of a rotor or a driving pin of a movable blade to a predetermined position in a deformed hole in accordance with a rotation direction of a motor. is there. Therefore, a leaf spring or a coil spring for urging the link in a predetermined direction or holding the link at a predetermined position is required. Therefore, the assembling work of the device is complicated, and it is likely to cause a failure. The present invention
It is an object of the present invention to provide a sheet cutting device in which switching between full width cutting and partial cutting of a sheet is reliably performed without using any kind of spring.

[0004]

SUMMARY OF THE INVENTION The present invention has a fixed blade and a movable blade disposed substantially in parallel with the fixed blade, and slides the movable blade edge so as to intersect with the fixed blade edge to move the fixed blade edge. In a so-called guillotine type sheet cutting apparatus for cutting a sheet passed between blade edges, a motor serving as a driving source of a movable blade, a rotor rotated by the motor, and a pivotally attached to the rotor by a predetermined angle. A switching plate having an engaging pin whose position from the center of the rotor differs when pivoted rightward and leftward, and a link for converting the rotational movement of the engaging pin into a reciprocating movement of the movable blade; A sheet cutting device characterized by changing the radius of rotation of the engagement pin according to the rotation direction of the motor to switch the length of the movable blade process, and to switch between full width cutting and partial cutting of the sheet.

[0005]

According to the sheet cutting apparatus of the present invention, a switching plate having an engagement pin having a position different from the center of the rotor when pivoted rightward and when pivoted leftward is provided on a rotor rotated by a motor. It is pivotally mounted at an angle. Therefore, as shown in FIG. 2, for example, when the rotor rotates rightward, the switching plate pivots relatively leftward, and the distance of the engagement pin from the center of the rotor becomes longer. Therefore, since the rotation radius of the engagement pin is increased, the process of the movable blade converted into the reciprocating motion by the link is lengthened, and the sheet is cut by the entire width. When the motor is reversed and the rotor rotates to the left, as shown in FIG. 3, the switching plate pivots relatively to the right, and the distance of the engagement pin from the center of the rotor decreases. Therefore, since the radius of rotation of the engagement pin is reduced, the process of the movable blade converted into reciprocating motion by the link is shortened, and the sheet is partially cut.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments. FIG. 1 is a front view of a sheet cutting apparatus 1 according to one embodiment of the present invention, and FIGS. 2 and 3 are explanatory views of a rotor 2 and a switching plate 3 which are main parts of the sheet cutting apparatus 1.

The sheet cutting apparatus 1 has a fixed blade 9 and a movable blade 8 arranged substantially in parallel with the fixed blade 9, and slides the movable blade edge 8a so as to intersect with the fixed blade edge 9a to move the fixed blade edge. This is a so-called guillotine type sheet cutting device that cuts a sheet passed between the blade edges. The movable blade edge 8a is formed in a mountain shape so that the sheet can be cut smoothly from both ends toward the center. Also, a guide piece 1 is provided at each end.
0 is provided.

The sheet cutting apparatus 1 includes a motor 16 serving as a driving source of a movable blade, a rotor 2 rotated by the motor, an elongated hole 13 pivotally attached to the rotor by a predetermined angle, and a link 13. A switching plate 3 having an engaging pin 4 to be engaged, and a link 11 for converting a rotational motion of the engaging pin into a reciprocating motion of the movable blade are provided.

The rotor 2 is axially mounted on a frame, and its outer teeth are engaged with a pinion 17 to be rotated by a motor 16. The switching plate 3 is pivotally connected to the rotor 2 by a pivot pin 5. A stopper hole 7 is formed in the switching plate 3 and is engaged with a stopper pin 6 protruding from the rotor 2 so that the switching plate 3 can pivot by the width of the stopper hole 7. An engagement pin 4 protrudes from the switching plate 3. The distance R between the engagement pin 4 and the center O of the rotor when the switching plate 3 pivots to the left with respect to the rotor 2 shown in FIG. Is longer than the distance r between the engaging pin 4 and the center O of the rotor when pivoted rightward. That is, the turning radius of the engagement pin 4 is larger in the case shown in FIG. 2 than in the case shown in FIG.

One end of the link 11 is pivotally connected to the frame by a pin 12, the other end of the elongated hole 13 is engaged with the engaging pin 4 of the switching plate 3, and the intermediate hole 15 is the pin of the movable blade 8. 14 are engaged. Therefore, when the engagement pin 4 rotates,
The link 11 pivots about the pin 12, and the movable blade 8 reciprocates up and down.

As shown by an arrow in FIG. 2, when the rotor 2 rotates rightward, the switching plate 3 naturally rotates leftward due to the reaction of the engaging pin 4, and as shown in FIG. Reference numeral 4 rotates around O when the turning radius R is large. Accordingly, the stroke of the movable blade 8 increases, the movable blade descends greatly, and the sheet is cut by the full width.

When the motor is reversed and the rotor 2 rotates to the left as shown by the arrow in FIG. 3, the switching plate 3 naturally rotates to the right due to the reaction of the engaging pin 4 as shown in FIG. As described above, the engagement pin 4 rotates around O in a state where the rotation radius r is small. Accordingly, the stroke of the movable blade 8 is reduced, the descent of the movable blade is reduced, and the sheet is partially cut without cutting the central portion.

[0013]

According to the sheet cutting apparatus of the present invention, the turning radius of the engaging pin of the switching plate naturally changes depending on the rotation direction of the motor, and the cutting is switched between full width cutting and partial cutting. Therefore, it is easy to assemble, has few failures, and has excellent durability.

[Brief description of the drawings]

FIG. 1 is a front view of a sheet cutting device 1. FIG.

FIG. 2 is an explanatory diagram of a rotor 2 and a switching plate 3, which are main parts of the sheet cutting device 1.

FIG. 3 is an explanatory diagram of a rotor 2 and a switching plate 3 which are main parts of the sheet cutting device 1.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sheet cutting device 2 rotor 3 switching plate 4 engagement pin 5 pivot pin 6 stopper pin 7 stopper hole 8 movable blade 9 fixed blade 10 guide piece 11 link 12 pin 13 long hole 14 pin 15 hole 16 motor 17 pinion

Claims (1)

(57) [Claims] 1. A sheet having a fixed blade and a movable blade disposed substantially in parallel with the fixed blade, and sliding the movable blade edge so as to intersect the fixed blade edge and passing the fixed blade edge between the fixed blade edge and the movable blade edge. In a guillotine type sheet cutting device that cuts
A motor serving as a drive source of the movable blade, a rotor rotated by the motor, and a center pivotally attached to the rotor so as to be able to pivot by a predetermined angle and pivoted rightward and leftward from the center of the rotor. A switching plate having an engaging pin having a different position, and a link for converting the rotational movement of the engaging pin into a reciprocating movement of the movable blade, and changing the rotational radius of the engaging pin according to the rotational direction of the motor. A sheet cutting apparatus characterized in that the length of the movable blade process is switched to switch between full width cutting and partial cutting of the sheet.