JPS6254638B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention provides that even if the movable blade does not move due to a foreign object being caught between the fixed blade and the movable blade, the drive means etc. that drive the movable blade will not cause any trouble. The present invention relates to a cutter device having such a structure.

For example, in a cutter device that is installed in a printing device and used to cut printed paper, if a foreign object such as a pencil gets caught between the fixed blade and the movable blade and the movable blade stops moving, the drive means that drives the movable blade The load increases rapidly, and there is a risk that each mechanism may become locked or the drive means may be damaged.

This invention was made in view of these circumstances, and its purpose is to prevent each mechanism from moving even if a foreign object becomes stuck between the fixed blade and the movable blade and the movable blade stops moving. To provide a cutter device with a simple structure in which parts are not locked and drive means are not disturbed.

The details of this invention will be explained below based on embodiments shown in the drawings.

The embodiment shown in FIGS. 1 to 6 is an example in which the present invention is applied to a cutter device installed in a printing device.
and a fixed plate 3 are fixed. One end of a rotating plate 5 is rotatably supported on the fixed plate 3 by a shaft 4. The other end of this rotating plate 5 and the fixed blade 2
A tension coil spring 6, which together with the rotary plate 5 constitutes a power absorbing means, is stretched between the rotary plate 5 and the rotary plate 5. Therefore, the rotating plate 5 is pivoted about the shaft 4 in the direction of the fixed blade 2, but rotation in the same direction is prohibited at the edge of the fixed plate 3. The rotary plate 5 further has an arc-shaped long hole 7 centered on the shaft 4.
An arcuate long hole 8 is provided centered on one end of the long hole 7 on the side opposite to the fixed blade 2 . A movable blade 9 that performs a shearing operation together with the fixed blade 2 is disposed on the upper surface side of the rotating plate 5. This movable blade 9 has a cutting edge on the left half shown in FIG. 1, and a shaft 1 on the lower surface of the right half.
0 and 11 are projected, and each shaft is inserted into the elongated holes 7 and 8, respectively, and a tension coil spring 12 tensioned between one end and the fixed blade 2 is used to rotate the shaft 11 as the center. It is rotationally biased in a direction away from the fixed blade 2. Therefore, when the machine is at rest, the shaft 11 is brought into contact with the terminal end of the elongated hole 8 on the side of the fixed blade 2, as shown in FIG. As shown in a plan view in FIG. 1, the cutting edge of the movable blade 9 is inclined so as to contact the cutting edge of the fixed blade 2 from the side closer to the shaft 11. Further, a support protrusion 3a protrudes from the upper surface of the fixed plate 3, and the movable blade 9 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 contacts the fixed blade 2 is chamfered or rounded so that the movable blade 9 can smoothly move along the upper surface of the fixed blade 2. The fixed blade 2 is tilted so that the end position is higher than the shearing start position.
The movable blade 9 is held substantially horizontally. Therefore, the cutting edges of the fixed blade 2 and the movable blade 9 intersect both in plane and in the height direction, and as the movable blade 9 rotates, the intersection moves linearly. .
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 9 from above, and prevents the movable blade 9 from lifting up. Furthermore, a spring (not shown) is provided at the rotating end of the movable blade 9 to pull it downward.
This spring is also used to prevent the movable blade 9 from floating up. Between the fixed blade 2 and the movable blade 9, a receipt paper 13 and a journal paper 14 printed by a printing section (not shown) are sent out in a direction perpendicular to the paper surface. Reference numeral 15 in FIG. 1 is a drive lever constituting a part of the drive means. Rotate it to the position shown by the medium phantom line. The movable blade 9 shears the receipt paper 13 during this rotation.

Further, as shown in FIG. 4a, if a foreign object 16 such as a pencil is caught between the fixed blade 2 and the movable blade 9, and the movable blade 9 stops moving in the direction of the fixed blade 2 during rotation. Then, as the drive lever 15 moves thereafter, the shaft 10 presses the rotary plate 5, causing the rotary plate 5 to rotate against the spring 6 (see FIG. 4b). That is, when the load on the movable blade 9 exceeds the tension of the spring 6, the driving force transmitted from the driving means to the movable blade 9 is absorbed by the power absorption means, and the driving force is transferred to the spring 6.
is limited to a predetermined magnitude corresponding to the tension of . Therefore, problems such as damage to the driving means due to a sudden increase in load can be reliably prevented.

By the way, the driving means is constructed as shown in FIGS. 4 and 5. That is, the drive lever 15
As shown in FIG. 4a, the lower end is rotatably connected to the main body frame 1, the upper end is used as a pressing part 15a against the movable blade 9, and a cam roller 17 is rotatably mounted in the middle part. There is. On the other hand, axis 1
A disc 19 and a cam 20 are pivotally supported on the cam 8 so as to rotate together, and the cam roller 17 is attached to the cam 20.
are brought into elastic contact by a spring 21. A ring-shaped locking plate 51 is further rotatably mounted on one side of the disc 19 by a shaft 22, as shown in FIG. 5a. This locking plate 21 has a locking protrusion 23 on the inner periphery and a locking step 24 on the outer periphery, and the locking protrusion 2
3 is rotationally biased towards the axis 18. 26 in the figure is the locking plate 5 that engages with the locking step portion 24.
A locking pawl 27 prohibits rotation in the biasing direction of the locking pawl 26, a spring 27 engages the locking pawl 26 with the locking step portion 24, and a reference numeral 28 connects the locking pawl 26 to the spring 27.
This is a magnet that rotates against the force and releases the engagement with the locking step portion 24. A ratchet wheel 29 is rotatably supported on the shaft 18. 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 9 is cut by the magnet 28.
This can be done automatically by energizing. 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 21 is rotated by the spring 25, and the locking protrusion 23 comes to engage with the ratchet wheel 29. Figure 5 b). Then, the rotational force of the ratchet wheel 29 is transmitted to the cam 20 via the locking plate 51 and the disk 19, and the rotation of the cam 20 causes the drive lever 15 to rotate as shown in FIG. The movable blade 9 is pressed and rotated by the pressing portion 15a. Normally, the rotation of the movable blade 9 causes the receipt paper 13 to be sheared between the fixed blade 2 and the movable blade 9, but if a foreign object 16 is caught between the fixed blade 2 and the movable blade 9, etc. The center of rotation of the movable blade 9 moves in the direction opposite to the fixed blade, and as described above, the driving force transmitted from the drive means to the movable blade 9 is absorbed by the power absorption means.

Note that the cutter device according to the present invention is not limited to being installed in a printing device, and can be applied to a wide range of applications.

As detailed above, according to the cutter device according to the present invention, even if a foreign object is caught between the fixed blade and the movable blade and the normal operation of the movable blade is disabled, the movable blade can rotate around the foreign object as a fulcrum. , and a certain amount of displacement of the drive lever, it is possible to reliably prevent damage caused by a sudden increase in the load on the drive means side and locking of each mechanism part.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention, FIG. 1 and FIGS. 4a and 4b are plan views, FIG. 2 is a partial perspective view of FIG. 1, and FIG. 3 is a partial perspective view of FIG. 1, and FIGS. 5a and 5b and 6a and 6b are side views partially showing the driving means. 2...Fixed blade, 5...Rotating plate, 6...Tension coil spring, 7, 8...Elongated hole, 9...Movable blade,
10, 11... shaft, 15... drive lever.

Claims (1)

[Claims] 1 a main body, a fixed blade fixed to the main body, a rotary cam attached to the main body and rotating,
a drive lever that is pivotally supported by the main body and rotates a predetermined amount by being biased by the cam surface of the rotary cam; a rotating plate that is pivotally supported by the main body and is rotatable; and a rotating fulcrum on the rotating plate. a movable blade that is rotatably supported via a movable support means and rotates in one direction by a predetermined amount of rotation of the drive lever to shear an object to be sheared that is interposed between the movable blade and the fixed blade; a return spring stretched between the main body or the fixed blade and the movable blade to return the movable blade to the anti-shearing direction; and a return spring stretched between the main body or the fixed blade and the rotating plate and the fixed When a foreign object is caught between the blade and the movable blade and further rotation of the movable blade in one direction is restricted, the movable blade and the rotary blade are moved using the foreign object as a fulcrum and the rotation fulcrum is moved by the supporting means. A cutter device comprising a buffer spring that allows rotation of the moving plate and rotation of the drive lever by a predetermined amount.