JPH04265770A - Automatic cutting mechanism for record sheet - Google Patents

Abstract

PURPOSE:To provide a power source which can be used for both transfer and cutting of record sheets by a method wherein a motor for transferring record sheets also includes a power source for a cutter for cutting the record sheets. CONSTITUTION:By an arrangement wherein a motor 6 for transferring record sheets includes a power source for a cutter 4 for cutting a record sheet 2, the transfer of the sheet 2 and the cutting thereof by means of the cutter 4 can be carried out in an associated manner using a single motor. Further, the power transmission to the cutter 4 can be changed from the outside, thereby changing cut lengths of the record sheet 2 as required.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic recording paper cutting mechanism in which a motor for conveying recording paper also serves as a power source for cutting recording paper.

0002

[Prior Art] Many facsimile machines for home or office use use roll paper as recording paper, and automatically cut the recording paper on which a document received from the other party is recorded into a predetermined size. Although models with automatic recording paper cutting mechanisms are more popular in the market than simpler models that cut the recording paper by hand, there is also a large disparity in manufacturing costs commensurate with these additional functions. Ta. The facsimile machine 1 shown in FIG. 3 is equipped with an automatic recording paper cutting function, passes a rolled recording paper 2 under a thermal head 3 to perform thermal printing, and also has a fixed blade 4a and a fixed blade 4a. The structure is such that the movable blade 4b is passed between the blades of the cutter 4 combined with the movable blade 4b and sent out to the outside of the apparatus. The surface of the recording paper 2 wound around a hard core roll 2a is constantly in contact with the paper feed roller 5 due to its own weight, and the paper feed roller 5 rotates by receiving power from the motor 6 for conveying the recording paper. The recording paper 2 is fed out at the same time. For the paper feed roller 5, a small diameter gear 7 assembled on the motor shaft of a motor 6 for conveying the recording paper, a large diameter gear 8, and then a small diameter gear installed at the shaft end of the paper feed roller 5. 9, the motor power is sequentially transmitted.

On the other hand, the movable blade 4b of the cutter 4 is attached to a support shaft 10.
It is biased in the cutting direction by a spring 11, one end of which is engaged, and in this state it abuts against the cam surface of the eccentric cam 12. The eccentric cam 12 has a small diameter gear 13 on its rotation center axis.
A large diameter gear 14 meshing with this small diameter gear 13 is rotated by a small diameter gear 16 assembled to the motor shaft of a motor 15 for cutting recording paper. This eccentric cam 12 causes the support shaft 10 to reciprocate up and down once, and at this time, the movable blade 4b also swings once, and moves in a direction perpendicular to the conveying direction between it and the fixed blade 4a. Cut recording paper 2 into pieces. In addition, in order to link the conveyance and cutting of the recording paper 2 at appropriate timings, a controller 17 is provided that controls starting and stopping of the two motors 6 and 15. Two motors 6 and 15 are arranged to operate in conjunction with each other depending on the size. In the case of this example, the motor 15 for cutting the recording paper, the gears 16, 14, 13, the support shaft 10, and the spring 1
The cutter 4 including the cutter 1 constitutes an automatic recording paper cutting mechanism 18.

0004

The conventional recording paper automatic cutting mechanism 18 described above uses a motor 6 as a power source for conveying the recording paper.
However, since the configuration uses another motor 15 as a power source for cutting the recording paper, at least two motors 6 and 15 are required. The problem was that the overall structure tended to become complicated. In addition, in order to link the conveyance and cutting of the recording paper at appropriate timing, two motors 6 and 1 are operated.
A controller 17 that controls the start and stop of the recording paper 6 is absolutely necessary, and if a feedback loop is to be introduced in order to more accurately link the conveyance and cutting of the recording paper 2,
It is necessary to arrange a more complicated monitoring mechanism etc. around the controller 17, and if the feedback loop is omitted and the controller 17 relies solely on forward-looking control, even a slight malfunction in the controller 17 can cause The recording paper 2 would be cut before finishing recording a sheet of manuscript, resulting in problems such as the risk of some important information being lost.

[0005]

[Means for Solving the Problems] The present invention has solved the above-mentioned problems, and includes a motor for conveying recording paper that sends out a roll of recording paper, a cam driven by this motor, and a cam that is driven by this motor. The first feature is that the cutter is provided with a cutter that oscillates in response to the displacement of the cam and cuts the recording paper into a certain length, and the cam is provided with a cutter whose reduction ratio can be externally switched. A second feature is that the power of the motor is transmitted through a reduction gear mechanism.

[0006]

[Operation] This invention allows the motor for transporting the recording paper to also serve as the power source for the cutter that cuts the recording paper, and uses the power of a single motor to link the transport of the recording paper and the cutting by the cutter. do. Furthermore, the power transmission to the cutter can be changed from the outside, so that the cutting length of the recording paper can be changed at will.

[0007]

Embodiments Examples of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a schematic perspective view showing an embodiment of a facsimile machine to which an automatic recording paper cutting mechanism of the present invention is applied.

The automatic recording paper cutting mechanism 22 incorporated in the facsimile machine 21 shown in FIG. A transmission gear is used as a means to replace the motor 15 for cutting the recording paper. The transmission gear 23 meshes with the gear 7 and also meshes with the gear 14, and serves to transmit the power of the recording paper conveying motor 6 to the eccentric cam 12.

When the motor 6 is started, the recording paper 2 is sent out by the power transmitted to the paper feed roller 5 via the gears 7, 8, and 9. On the other hand, the power of the motor 6 is transmitted to the eccentric cam 12 via the gears 23, 14, 13, and the eccentric cam 12 swings the support shaft 10 of the movable blade 4b up and down. This swinging displacement of the movable blade 4b is performed in conjunction with the feeding of the recording paper 2, so when the recording paper 2 has been fed out a certain length, the movable blade 4b makes one reciprocation and cuts the recording paper 2. It turns out. Therefore, the recording paper 2 can always be cut to a predetermined length without relying on a special controller 17 or the like.

[0010] In this way, the recording paper automatic cutting mechanism 22
A cutter 4 for cutting the recording paper 2 is attached to a motor 6 for conveying the recording paper.
The power source for the recording paper 2 and the cutting by the cutter 4 are linked together using a single motor power. There is no need to prepare separate motors 6 and 15 for cutting, and by simply distributing the power of a single motor 6 to conveying and cutting the recording paper 2, it is possible to carry out both conveyance and cutting of the recording paper 2. . Furthermore, since the conveyance and cutting of the recording paper 2 are performed in conjunction with each other in accordance with the rotational phase of the motor 6, there is no need for a special controller 17 for interlocking the two motors 6 and 15, which was required in the past. It is possible to convey and cut the recording paper 2 according to a simple but reliable mechanism principle, and especially when applied to a home or portable facsimile device 21 where compactness and reduction of manufacturing costs are desired. The effect is huge.

In the above embodiment, the simplest configuration example was shown in which the recording paper cutting motor 15 was simply replaced with a single transmission gear 23, but the facsimile machine 31 shown in FIGS. Recording paper automatic cutting mechanism 32 built into
By arranging the two transmission gears 33 and 34 with different diameters so that one of them can selectively mesh with the gear 7, the power transmission ratio to the eccentric cam 12 with respect to the transmission gears 33 and 34 is reduced to 2. It can also be switched on the street. The transmission gears 33 and 34 are fixed in their axial positions by a triangular fixing bar 35 so that they are always in mesh with the gear 14. Here, gears 7, 33,
34, 14, and 13 constitute a reduction gear mechanism 36.

By the way, the transmission gears 33 and 34 are both planetary gears that are always in mesh with the gear 14, but the gear 7
The gears 33 and 34 are positioned using a spring 37 and a plunger solenoid mechanism 38 so that only one of the gears 33 or 34 is selectively engaged. That is, the spring 37 biases the shaft of the transmission gear 33 with the smaller diameter clockwise in FIGS. A rod 39 connecting the shafts of the transmission gears 34 and 33 against the spring 37 locks the transmission gears 34 and 33.

In the state shown in FIG. 2, the solenoid 38b of the plunger solenoid mechanism 38 is energized, and the plunger 38a, which has received the magnetic force of the solenoid 38b, remains at the backward movement limit position. Therefore, the transmission gear 33 having a smaller diameter is meshed between the gears 7 and 14, and the reduction ratio of the reduction gear mechanism 36 is set to be small. Therefore, the amount of displacement of the eccentric cam 12 per unit rotation of the motor 6 is relatively large, and the length of the recording paper 2 to be cut is relatively small. On the other hand, in the state shown in FIG. 3, the solenoid 38b of the plunger solenoid mechanism 38 is de-energized, and the plunger 38a released from the demagnetized solenoid 38b absorbs the force of the spring (not shown) in the solenoid 38b. It protrudes to near the forward movement limit position. For this reason,
A transmission gear 34 having a larger diameter meshes between the gears 7 and 14, and the reduction ratio of the reduction gear mechanism 36 is set to a large value. Therefore, the amount of displacement of the eccentric cam 12 per unit rotation of the motor 6 is relatively small, and the length of the recording paper 2 to be cut is relatively large.

In this way, the automatic recording paper cutting mechanism 22 using the two transmission gears 33 and 34 adjusts the power transmission ratio of the motor 6 that conveys the recording paper 2 to the length of the recording paper 2 to be cut. It is possible to switch between two methods, thereby making it possible to change the size of the recording paper according to the original to be sent on the sending side of the facsimile device 31, and making it possible to use the recording paper 2 economically. Note that in the above embodiment, the reduction gear mechanism 36 is one that can switch the reduction ratio in two ways, but a reduction gear mechanism that can change the reduction ratio in three or more ways may also be used. .

[0015]

As explained above, according to the automatic recording paper cutting mechanism of the present invention, the motor for conveying the recording paper also serves as the power source for the cutter that cuts the recording paper, and the single motor power Since the structure uses a motor to transport the recording paper and cut the recording paper in conjunction with each other, there is no need to prepare separate motors for transporting the recording paper and cutting the recording paper, as in the past. By simply distributing the power of the motor to conveying and cutting the recording paper, it is possible to carry out both conveyance and cutting of the recording paper, and the conveyance and cutting of the recording paper are performed in conjunction with each other according to the rotational phase of the motor. Therefore, there is no need for any special controller to interlock the two motors, and it is possible to convey and cut the recording paper according to the simple but reliable mechanism principle, which makes it more compact and reduces manufacturing costs. This provides excellent effects such as being able to provide an automatic recording paper cutting mechanism that is particularly suitable for home-use or portable facsimile machines and the like where it is desired to reduce the amount of paper cut.

Furthermore, the present invention is configured so that the power transmission to the cutter can be externally varied and the cutting length of the recording paper can be arbitrarily varied. It is possible to change the cutting length, and the recording paper can be used economically.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an embodiment of a facsimile machine to which an automatic recording paper cutting mechanism of the present invention is applied.

FIG. 2 is a schematic perspective view showing another embodiment of a facsimile machine to which the automatic recording paper cutting mechanism of the present invention is applied.

3 is a schematic perspective view showing another mode of operation of the automatic recording paper cutting mechanism shown in FIG. 2; FIG.

FIG. 4 is a schematic perspective view showing an example of a facsimile machine to which a conventional automatic recording paper cutting mechanism is applied.

[Explanation of symbols]

2 Recording paper 4 Cutter 6 Motor for transporting recording paper 12 Eccentric cam 22, 32 Automatic recording paper cutting mechanism 23, 33, 34 Transmission gear 36 Reduction gear mechanism

Claims (2)

[Claims] 1. A motor for transporting recording paper that sends out a roll of recording paper, a cam driven by this motor, and a cam that swings in response to the displacement of the cam to move the recording paper at a constant rate. An automatic recording paper cutting mechanism characterized by being equipped with a cutter for cutting to length. 2. The automatic recording paper cutting mechanism according to claim 1, wherein the power of the motor is transmitted to the cam via a reduction gear mechanism whose reduction ratio is externally switchable.