JPS6254639B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for driving the movable blade even when the movable blade does not move due to, for example, a foreign object being caught between the fixed blade and the movable blade. This invention relates to a cutter device that does not cause any trouble.

[Problems to be Solved by the Prior Art and the Invention] For example, in a cutter device that is installed in a printing device and is used to cut printed paper, if a foreign object such as a pencil gets caught between the fixed blade and the movable blade, If the movable blade stops moving, the load on the driving means for driving the movable blade increases rapidly, and there is a risk that each mechanism may become locked or the driving means may be damaged.

The present invention has been made based on the above points,
The purpose of this is to prevent each mechanism from locking up or causing problems with the drive means even if a foreign object gets caught between the fixed blade and the movable blade and the movable blade stops moving. The object of the present invention is to provide a cutter device having a simple configuration.

[Means for Solving the Problems] That is, the cutter device according to the present invention includes a cutter device main body, a fixed blade fixed to the cutter device main body, and a rotatable blade provided on the cutter device main body via a shaft. A movable blade that performs a shearing operation together with the fixed blade, a rotary plate rotatably provided on the cutter device main body via the shaft, a driving means for driving the rotary plate, and the movable blade and the rotary plate. and a spring that is stretched between the movable blade and the rotary plate to rotate the movable blade together with the rotary plate, and elastically displaces when the load on the movable blade exceeds a predetermined value to allow rotation of only the rotary plate. It is characterized by the fact that

[Operation] In other words, if a foreign object exists between the fixed blade and the movable blade and the movable blade cannot rotate, the spring stretches and only the rotating plate rotates, thereby causing the drive means to rotate. The purpose is to absorb the driving force transmitted from the

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. A fixed blade 2 and a fixed plate 3 are fixed between a pair of left and right main body frames 1 in FIG. Further, in the figure, reference numeral 4 is a movable blade, and reference numeral 5 is a rotating plate. One end of the movable blade 4 and the intermediate portion of the rotary plate 5 are rotatably supported on a common shaft 6 that is erected from the fixed plate 3. The above movable blade 4
An elongated hole 7 on an arc centered on the shaft 6 is bored in the middle part of the movable blade 4. A pin 8 is inserted into the elongated hole 7 at one end of the rotating plate 1, and a pin 8 is inserted in the middle part of the movable blade 4. Another pin 9 is provided, and a tension coil spring 10 is adjusted between the pins 8 and 9, which together with the rotary plate 5 constitute a power transmission means. The shaft 6 is fixed to a suitable fixed part, and when a force from the driving means is applied to the other end of the rotary plate 5 as shown by the arrow in the figure, the movable blade 4 and the rotary plate 5 rotate together around the shaft 6. The shearing operation is performed between the movable blade 4 and the fixed blade 2. At this time, if there is a foreign object between the fixed blade 2 and the movable blade 4 and the movable blade 4 stops moving during the rotation operation, the spring 10 is elastically displaced so that only the rotation plate 5 rotates. Become. This causes a sudden increase in the load on the drive means of the movable blade 4,
The aim is to prevent locking of each mechanical part and damage to the driving means.

As shown in FIG. 1, the movable blade 4 is inclined so as to contact the cutting edge of the fixed blade 2 from the side closer to the shaft 6. Further, a support protrusion 3a protrudes from the upper surface of the fixed plate 3, and the movable blade 4 is supported by this protrusion 3a and is tilted so that the cutting edge is lower as shown in FIG. . The portion of the cutting blade that first comes into contact with the fixed blade 2 is chamfered or rounded so that the movable blade 4 can move smoothly along the fixed blade 2. Further, the fixed blade 2 is inclined so that its end position is higher than the paper cutting starting position, and the movable blade 4 is held substantially horizontally. Therefore, the cutting edges of the fixed blade 2 and the movable blade 4 intersect both in plane and in the height direction, and the intersection moves linearly as the movable blade 4 rotates.

A plate spring 2a having a wave-shaped cross section as shown in FIG. 2 is screwed onto the upper surface of the fixed blade 2.
This leaf spring 2a functions to press down the cutting edge starting end of the movable blade 4 from above, and prevents the movable blade 4 from floating up. Furthermore, a spring (not shown) that pulls downward is provided at the rotating end of the movable blade 4. This spring is also used to prevent the movable blade 4 from floating. A tension coil spring 12 is stretched between the end of the rotating plate 5 and the fixed blade 2, and the rotating plate 5 is biased to rotate counterclockwise in FIG. 1 by the tension spring 12. There is. Between the fixed blade 2 and the movable blade 4 are a receipt paper 13 and a journal paper 1 printed by a printing section (not shown).
4 is sent out in a direction perpendicular to the plane of the paper. Reference numeral 15 in FIG. 1 is a drive lever constituting a part of the drive means.
is rotated about the shaft 6 to the position shown by the imaginary line in the figure. The movable blade 4 cuts the receipt paper 13 during this rotation.

The driving means is constructed as shown in FIGS. 4 and 5. That is, as shown in FIG. 4a, the drive lever 15 has a lower end rotatably attached to the main body frame 1, an upper end as a pressing part 15a against the movable blade 4, and a cam roller 17 in the middle part for rotation. It can be worn freely. On the other hand, a disk 19 and a cam 20 are supported on the shaft 18 so as to rotate together, and the cam roller 17 is brought into elastic contact with the cam 20 by a spring 21. Said disk 1
Further, a ring-shaped locking plate 31 is rotatably attached to one side of the ring 9 by means of a shaft 22, as shown in FIG. 5a. The locking plate 31 has a locking protrusion 23 on the inner circumference,
Each has a locking step 24 on the outer periphery, and a locking convex portion 23 is connected to the disk 19 by a spring 25 adjusted.
is rotationally biased toward the axis 18.
Reference numeral 26 in the figure indicates that the locking plate 3 is engaged with the locking step portion 24.
Prohibition claw that prohibits rotation in the direction of deviation of 1, code 2
Reference numeral 7 designates a spring that engages the prohibition pawl 26 with the locking step 24, and numeral 28 designates a magnet that rotates the locking pawl 26 against the spring 27 to release the locking pawl 26 from engagement with the locking step 24. . Also, the shaft 18
A ratchet wheel 29 is rotatably supported on the shaft. This ratchet wheel 29 is rotationally driven in the direction of the illustrated arrow by a drive source (not shown).

Therefore, the receipt paper 13 interposed between the fixed blade 2 and the movable blade 4 can be automatically cut by energizing the magnet 28. That is, when the locking pawl 26 is disengaged from the locking step 24 due to the energization of the magnet 28, the locking plate 22 is moved by the spring 2.
5, and the locking convex portion 23 comes to engage with the ratchet wheel 29 (FIG. 5b). Then the ratchet wheel 2
9 is transmitted to the cam 20 via the locking plate 31 and the disc 19, and the rotation of the cam 20 causes the drive lever 15 to rotate as shown in FIG. 4b.
The rotating plate 5 is pressed and rotated by the pressing portion 15a. This rotation of the rotating plate 5 causes the movable blade 4 to rotate together, and a shearing operation is performed between the movable blade 4 and the fixed blade 2, and the receipt paper 13 is sheared.
At this time, if a foreign object exists between the fixed blade 2 and the movable blade 4 and the movable blade 4 becomes unable to rotate, the spring 10 is elastically displaced and only the rotary plate 5 is rotated. That is, the driving force transmitted from the driving means to the movable blade 4 is absorbed by the spring 10. Therefore, even if a foreign object exists between the fixed blade 2 and the movable blade 4 and the movable blade 4 becomes unable to rotate, the load on the drive means side will not increase suddenly, and each mechanical part This makes it possible to prevent situations such as locking or damage to the drive means.

[Effects of the Invention] According to the present invention, the driving force transmitted from the driving means to the movable blade can be limited to a predetermined magnitude by the spring stretched between the rotating plate and the movable blade. Therefore, even if there is a foreign object between the fixed blade and the movable blade, the load on the drive means will increase rapidly, causing damage to the drive means or locking of each mechanism. This makes it possible to prevent situations from occurring.

[Brief explanation of the drawing]

1 to 5 are views showing one embodiment of the present invention, in which FIG. 1 is a plan view of the cutter device, FIG. 2 is a perspective view showing a part of FIG. 1, and FIG. The partial sectional views in the figures, FIGS. 4a and 4b and 5a and 5b, are side views partially showing the driving means. 1... Body frame, 2... Fixed blade, 3... Fixed plate, 4... Movable plate, 5... Rotating plate, 6... Shaft,
10... Spring, 15... Drive lever.

Claims (1)

[Claims] 1 A cutter device main body, a fixed blade fixed to the cutter device main body, a movable blade that is pivotally supported by the cutter device main body and performs a shearing operation together with the fixed blade by rotating in one direction, and a movable blade fixed to the cutter device main body. a rotary plate pivotally supported coaxially with the movable blade; a rotary cam attached to the cutter device main body for rotational operation; The drive lever is stretched between a drive lever that rotates a fixed amount, and the movable blade and the rotating plate, and during normal shearing operations, the rotation of the rotating plate due to the rotation of the drive lever by a predetermined amount is transmitted to the movable blade. The movable blade is rotated in one direction to shear the object to be sheared that is inserted between the movable blade and the fixed blade, and when the load on the movable blade exceeds a predetermined value, it is elastically displaced and the rotating plate is rotated. and a spring that allows the drive lever to rotate by a predetermined amount, and a spring that is stretched between the cutter device main body or the fixed blade and the rotating plate and that rotates the rotating plate in a direction opposite to the direction in which the drive lever rotates. A cutter device characterized by comprising a return spring for returning the cutter to the original state.