JPS6137075B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a driving means, etc. that drives a 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 conventional technology and invention]

For example, in a printing device, 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 load on the drive means that drives the movable blade increases rapidly, causing each mechanism to lock. There is a risk that the drive means may be damaged.

The present invention has been made based on the above points, and its purpose is to prevent each mechanical part 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 which is prevented from locking or causing trouble to a driving means.

[Means for solving problems]

That is, the cutter device according to the present invention includes a main body, a fixed blade fixed to the main body, a rotating cam attached to the main body and rotating, and a rotating cam pivoted by the main body and biased against a cam surface of the rotating cam. A drive lever rotates by a predetermined amount, and when the drive lever rotates by a predetermined amount, it rotates in one direction to shear the object to be sheared that is inserted between the fixed blade and the rotating fulcrum. A foreign object is caught between a movable blade that is movably installed, a return spring that is stretched between the movable blade and the main body and returns the movable blade to the anti-shearing direction, and the fixed blade and the movable blade. When the movable blade is restricted from further rotation in one direction, the movable blade uses the foreign object as a fulcrum and the movable blade moves by a predetermined amount, and the drive lever moves by a predetermined amount. The invention is characterized in that it is equipped with a buffer spring that allows this.

[Effect]

In other words, when a foreign object is interposed between the movable blade and the fixed blade and the movement of the movable blade is restricted, the buffer spring is elastically deformed so that the movable blade uses the foreign object as a fulcrum and the rotational fulcrum. This allows rotational movement accompanied by movement and rotation of the drive lever by a predetermined amount, thereby ensuring normal operation of the drive lever.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. A fixed blade 2 and a fixed plate 3 are fixed between a pair of left and right main body frames 1 in FIG. One end of a rotary plate 5 is rotatably supported on the fixed plate 3 by a shaft 4. A buffer spring 6 is stretched between the other end of the rotating plate 5 and the fixed blade 2. Therefore, the rotating plate 5 is connected to the shaft 4.
The fixed blade is rotated in two directions around the fixed blade 3, but the rotation in the same direction is restricted by the edge of the fixed plate 3. The rotary plate 5 further includes an arc-shaped elongated hole 7 centered on the shaft 4 and a non-fixed blade 2 in the elongated hole 7.
An arc-shaped elongated hole 8 centered at one end of the side is provided. 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.
The shafts 10 and 11 are protruded from the lower surface of the right half, and each shaft is inserted into the elongated holes 7 and 8, respectively, and the return spring 12 stretched between one end and the fixed blade 2 It is rotated about the shaft 11 in a direction away from the fixed blade 2. Therefore, when at rest, the shaft 11 is inserted into the elongated hole 8 as shown in FIG.
It is brought into contact with the terminal end of the fixed blade 2 side. Movable blade 9
The cutting edge is attached to the shaft 11 as shown in plan view in FIG.
It is tilted so as to touch the cutting edge of the fixed blade 2 from the side closest to . 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. Further, the fixed blade 2 is inclined so that the end position is higher than the shearing start position, and 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 leaf 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 end portion of the movable blade 9 from above, and prevents the movable blade 9 from floating up. Furthermore, a spring (not shown) that pulls downward is provided at the rotating end of the movable blade 9, and this spring also prevents the movable blade 9 from floating up. Between the fixed blade 2 and the movable blade 9 is a receipt paper 13 printed on a printing section (not shown).
Then, the journal paper 14 is sent out in a direction perpendicular to the paper surface. Further, reference numeral 15 in FIG. 1 is a driving lever that is a part of a circle of the driving means. and rotate it to the position shown by the imaginary line in the figure. The movable blade 9 shears the receipt paper 13 during this movement.

Further, as shown in FIG. 4a, for example, a foreign object 16 such as a pencil may be caught between the fixed blade 2 and the movable blade 9, and the movable blade 9 may become stuck in the direction of the fixed blade 2 during rotation. In this case, as the drive lever 15 moves thereafter, the shaft 10 presses the rotating plate 5, causing the rotating plate 5 to rotate against the buffer spring 6. This is the fourth
Shown in Figure b. That is, when the load on the movable blade 9 exceeds the tension of the buffer spring 6, the driving force transmitted from the driving means to the movable blade 9 is absorbed by the elastic deformation of the buffer spring 6. As a result, the movable blade 9 rotates clockwise in FIG. 4B using the foreign object 16 as a fulcrum, and the normal operation of the drive lever 15 is also guaranteed. Therefore, it is possible to effectively prevent a situation where the driving means is damaged due to a sudden increase in load.

Next, the structure of the driving means will be explained with reference to FIGS. 5 and 6. The drive lever 15
has its lower end rotatably pivoted to the main body frame 1, while its upper end is a pressing part 15 against the movable blade 9.
It is set as a. And camflora 17 in the middle part
is attached so that it can rotate freely. On the other hand, a disc 19 and a cam 20 are supported on the shaft 18 so as to rotate together, and the cam flower 17 is brought into elastic contact with the cam 20 by a spring 21. Said disk 19
As shown in FIG. 6a, a ring-shaped locking plate 51 is rotatably mounted on one side of the ring by means of a shaft 22. As shown in FIG. This locking plate 51 has a locking protrusion 23 on the inner periphery and a locking step 24 on the outer periphery.
It is being rotated in the direction of approaching. Further, reference numeral 26 in the figure is a locking pawl that engages with the locking step 24 and prohibits rotation of the locking plate 51 in the biasing direction, and a reference numeral 27 indicates that the locking pawl 26 is connected to the locking step 24. A spring 28 that engages with the locking claw 26 is a magnet that rotates the locking pawl 26 against the spring 27 to release the locking step 24 from engagement with the locking step 24. Note that the shaft 18
A ratchet wheel 29 is rotatably supported on the shaft. This ratchet wheel 29 is rotationally driven in the direction indicated by the arrow in the figure by a drive source (not shown).

The operation will be explained based on the above configuration. First, the receipt paper 13 interposed between the fixed blade 2 and the movable blade 9 can be automatically cut by energizing the magnet 28. That is, magnet 28
When the locking pawl 26 is disengaged from the locking step portion 24 due to the energization, the locking plate 51 is rotated by the spring 25, and the locking convex portion 23 comes to engage with the ratchet wheel 29. This is shown in Figure 6b. With this, the ratchet wheel 2
9 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. 5b. This rotation of the drive lever 15 causes the pressing portion 15a of the drive lever 15 to press the movable blade 9, causing the movable blade 9 to rotate in the shearing direction. Due to this rotation of the movable blade 9, the receipt paper 13 is sheared between the fixed blade 2 and the movable blade 9.

Next, a case will be described in which a foreign object 16 is caught between the movable blade 9 and the fixed blade 2 as shown in FIG. 4A during the above-mentioned shearing operation. In this case, the load on the movable blade 9 from the foreign object 16 increases and eventually exceeds the tension of the buffer spring 6. As a result, the buffer spring 6 starts elastic deformation. Due to the elastic deformation of the buffer spring 6, the movable blade 9 together with the rotary plate 5 rotates with the foreign object 16 as a fulcrum, moving the center of rotation in the direction opposite to the fixed blade, as shown in FIG. 4b. This action ensures that the drive lever 15 operates in the same manner as during normal shearing, and it is therefore possible to effectively prevent a situation where an excessive load is applied to the drive means and damages it.

According to the above embodiments, the following effects can be achieved. That is, if a foreign object 16 is interposed between the fixed blade 2 and the movable blade 9 and the shearing action of the movable blade 9 is restricted, the load on the movable blade 9 exceeds the tension of the buffer spring 6, causing the buffer spring to 6 starts elastic deformation. As a result, the movable blade 9 rotates with the foreign object 16 as a fulcrum and its center of rotation moves in the direction opposite to the fixed blade. This ensures the normal operation of the drive lever 15, so
It is possible to effectively prevent an excessive load from being applied to the driving means, and it is possible to maintain the soundness of the driving means.

Note that the present invention is not limited to the cutter device of a printing device, but can be applied to a wide range of applications.

〔Effect of the invention〕

As described in detail above, according to the cutter device according to the present invention, even if a foreign object is interposed between the fixed blade and the movable blade and the shearing operation of the movable blade is restricted, the normal Guarantee the operation of time,
It is possible to maintain its soundness.

[Brief explanation of the drawing]

1 to 6 are views showing one embodiment of the present invention, in which FIG. 1 is a plan view of a cutter device, FIG. 2 is a partial perspective view of FIG. 1, and FIG. 3 is a partial perspective view of FIG. 1. 4a and 4b are plan views of the cutter device for explaining the operation, 5a and 5b are sectional views, and 6a and 6a are sectional views.
b is a side view for explaining the configuration and operation of the driving means. DESCRIPTION OF SYMBOLS 1...Body frame, 2...Fixed blade, 6...Buffer spring, 9...Movable blade, 12...Return spring, 15...Drive lever, 20...Cam.

Claims (1)

[Claims] 1 a main body, a fixed blade fixed to the main body, a rotary cam attached to the main body that rotates, and a drive that is pivoted by the main body and is biased by the cam surface of the rotary cam to rotate a predetermined amount. A lever, and a movable lever installed so that it rotates in one direction by a predetermined amount of rotation of this drive lever and shears the object to be sheared that is inserted between it and the fixed blade, and its rotation fulcrum is movable. A foreign object is caught between the blade, the return spring stretched between the movable blade and the main body, and returns the movable blade to the anti-shearing direction, and the fixed blade and the movable blade, causing the movable blade to move in one direction. a buffer spring that uses the foreign object as a fulcrum and allows rotation of the movable blade accompanied by movement of the rotation fulcrum and rotation of the drive lever by a predetermined amount when further rotation of the movable blade is restricted; A cutter device characterized by: