JPH0731995Y2 - Cutter rotary blade positioning mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a mechanism for positioning a rotary blade of a paper cutting cutter that can be used in copying machines, plotters, printers and the like.

[Prior Art] Conventionally, the following method is well known as a device for positioning a rotary blade of a cutter that intermittently cuts sheets one by one to a home position. That is, (a) when the cutter cuts an object to be cut and then stops the rotational force to stop at the original home position, a groove is provided in a part of the circumferential surface of the disk that rotates together with the rotary blade, and the groove is formed. There is a method of positioning the cutter rotating blade by positioning the cutter rotating blade by stopping the rotation of a motor or the like for driving the cutter by turning on / off a power supply, etc.

[Problems to be Solved by the Invention] In the positioning mechanism according to the method (a) of the related art,
If the groove on the circumferential surface is a shallow groove such as a V-shaped groove, the stopper that has once fallen due to spring force may come out due to the inertial force of the rotary blade. Due to the large inertial force of the rotating blade with weight,
There was a risk that the depressed stopper would be destroyed.

Further, as in the method of (b) above, the motor is stopped by simply turning the power supply on and off after cutting off the rotational force driving force, and the rotary blade stop position is to be determined. As a result, the same positional displacement occurs, which makes it difficult to perform reliable positioning.

Even if the methods (a) and (b) are combined, it is difficult to reliably stop the rotary blade at a fixed position against the inertial force of the rotational force.

[Means for Solving the Problems] The present invention solves various drawbacks of the prior art, and provides a positioning mechanism capable of reliably positioning the rotary blade of the cutter at the home position without difficulty.

The structure of the present invention will be described with reference to the drawings showing an embodiment. A cutter rotary blade positioning mechanism according to the present invention rotates a cutter rotary blade 1 located at a home position by externally applying a rotational force to rotate the cutter rotary blade 1. Is a mechanism for positioning the cutter rotary blade 1 which cuts off the rotational force and stops at the original home position after cutting, and coaxially with the tip small diameter portion 3a of the extension shaft 3 of the cutter rotary blade 1. A boss portion 5 provided with a disc-shaped plate 4 is rotatably fitted, and a groove 9 to which a rotation stopping roller 8 is engaged is formed on the outer periphery of the disc-shaped plate 4, and the boss portion 5 has Long groove 12 in the circumferential direction
And the bracket 7 formed on the extension shaft 3
7a provided on the disk and the pin side 7a of the disk-shaped plate 4
A pin 4a is also formed, and a horseshoe-shaped leaf spring 6 having elastic force is attached between the pins 7a, 4a so as to surround the extension shaft 3 and spread, and further, a long groove 12 formed in the boss portion 12 The rotation angle regulating pin 11 engaged with the
Even after the rotation force of the cutter rotary blade 1 is cut off and the rotation stop roller 8 stops the rotation of the disc-shaped plate 4.
The cutter rotary blade 1 is rotatable within the length range of the long groove 12 due to inertial force, and is configured to return to the home position position after being stopped by the repulsive force of the leaf spring 6.

[Operation] Since the present invention is configured as described above, after rotating the rotary blade by externally applying a rotational force to cut the object to be cut,
When the rotation force is stopped and the rotation member is stopped by stopping the rotation force from the outside, the rotary blade continues to rotate due to the inertia, and the extension shaft also rotates,
Since the rotating member is stopped, the male member interposed between the extension shaft and the rotating member is deformed and stored, and the continued rotation is also stopped by rotating by a relative angle by the relative rotation restricting means. Then, the rotary blade returns to the original home position along with the extension shaft by the reaction of the stored elastic member, and the positioning is completed.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a rotary blade of a cutter, which has a clutch 2 for intermittently transmitting a rotational force from the outside at one end portion, and has a local end. Extension shaft 3
A bracket 7 for supporting one end of an inertia erasing leaf spring 6 having a horseshoe shape with both ends isolated from each other by a pin 7a and a tip of the extension shaft 3 are formed on the bracket 7. A rotation angle regulating pin 11 is provided on the small diameter portion 3a. A disk-shaped plate 4 having a cylindrical boss portion 5 is rotatably fitted on the outer periphery of the small-diameter portion 3a of the extension shaft 3. On the side surface of the disk-shaped plate 4 on the side of the pin 7a, the local end of the inertia erasing leaf spring 6 is supported by a pin 4a provided on the disk-shaped plate 4, and the outer peripheral surface of the plate 4 is used for positioning. A groove 9 into which the roller 8 is fitted is provided, while a long groove 12 extending in the circumferential direction is bored in the peripheral surface of the cylindrical boss portion 5, and the rotation angle regulating pin 11 is inserted into the long groove 12. It

Depending on the circumferential length of the long groove 12, the rotation angle regulating pin
The maximum rotation angle due to the inertia of the extension shaft 3 having 11, that is, the rotary blade 1 is restricted.

With this structure, the energized solenoid
When the roller 8 supported by the arm 13 via the arm 13 via the arm 13 is disengaged from the groove 9 of the disk-shaped plate 4 and the clutch 2 is connected at the same time, the rotary blade 1 makes one rotation in the arrow direction to cut the paper. At this time, the disk-shaped plate 4 also rotates via the plate spring 6. Then, the solenoid 10 is de-energized and the roller 8 is brought into contact with the peripheral edge of the disk-shaped plate 4 which is rotating together with the extension shaft 3 via the leaf spring 6 by the spring force or the like, and is immediately inserted into the groove 9 to be inserted into the disk 9. The rotation of the plate 4 is stopped. At the same time, the clutch 2 is disengaged. However, since the rotary blade 1 has inertia, it continues to rotate due to its inertial force, and while bending the plate spring 6 to store energy, the rotation angle regulating pin 11 moves from one end of the long edge 12 to the other end (in the case shown in the figure). , Left end to right end) Rotate within an angle to stop and stop.

Then, the rotary blade 1 and the extension shaft 3 are moved to their original positions (the rotation angle regulating pin 11 is the long groove 12 by the reaction force of the inertia erasing leaf spring 6, that is, the restoring force stored in the leaf spring 6).
(The position shown in the drawing is in contact with the left end of the cutter), and the cutter rotary blade is positioned at the home position.

As described above, in the present embodiment, the clutch 2 is used for applying and interrupting the rotational force, the inertia erasing leaf spring 6 is used as the elastic member, and the rotating member is the disk-shaped plate 4. Further, the rotation stop means is formed from the roller 8, the groove 9, the solenoid 10 and the arm 13 from the boss portion 5, and the relative rotation restriction means is formed from the rotation angle restriction pin 11 and the long groove 12, respectively.

[Advantages of the Invention] Since the cutter rotary blade positioning mechanism of the present invention has the configuration and operation as described above, when the cutter rotary blade 1 is stopped, the rotary input is first blocked and the rotary member is rotated. 4,5 are stopped by rotation stop means 8,9,10,
On the other hand, the rotation of the rotary blade 1 is allowed by the relative rotation restricting means 11 and 12 by a certain angle, while the inertia of the cutter rotary blade is absorbed and stored by the elastic member 6, and the rotary blade 1 is rotated by a certain angle and stopped. After that, the elastic force accumulated in the elastic member 6 and the relative rotation restricting means 11 and 12 can be used to restore the original position.

Therefore, according to the present invention, it is possible to improve the positioning accuracy of the rotary blade, cushion the rotary blade inertia, reduce the cutter offset amount due to high-speed rotation of the rotary blade, and solve the drawbacks of the conventional technology. .

[Brief description of drawings]

The drawing is a perspective view of a cutter rotary blade provided with the positioning mechanism of the present invention. 1 ... rotary blade, 3 ... extension shaft, 4 ... disk-shaped plate,
5 ... Boss part, 6 ... Leaf spring for erasing inertia, 8 ...
Roller, 9 ... Groove, 10 ... Solenoid, 11 ... Rotation angle regulating pin, 12 ... Long groove.

Claims (1)

[Scope of utility model registration request] 1. A cutter rotary blade for applying a rotational force to a cutter rotary blade located at a home position to rotate the cutter rotary blade to cut the workpiece, cut off the rotary force, and stop at the original home position. Locating mechanism, wherein a boss portion provided with a disk-shaped plate is coaxially fitted to the extension shaft of the cutter rotary blade so as to be rotatable, and a rotation stop roller is provided on the outer periphery of the disk-shaped plate. Along with forming a groove for locking, a long groove is formed in the boss portion in the circumferential direction, and a pin provided on a bracket formed on the extension shaft and a pin on the pin side of the disc plate are also formed, A horseshoe-shaped leaf spring with elastic force is attached between both pins so as to surround the extension shaft, and a rotation angle regulating pin that engages with the long groove formed in the boss is installed upright on the extension shaft. Rotation force to the cutter rotary blade Even after the rotation is stopped and the rotation stop roller stops the rotation of the disk-shaped plate, the cutter rotary blade can be rotated to some extent by inertial force, and after the stop, it is configured to return to the home position position. Characteristic cutter rotary blade positioning mechanism.