JPH0735748Y2 - Cutter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a cutter device for cutting a sheet such as a roll paper or a synthetic resin film between a fixed blade and a movable blade.

[Prior Art] A cutter device used for a facsimile or the like includes a fixed blade and a movable blade. The movable blade is rotated by a predetermined amount to cut a sheet, and further rotated to return the movable blade to an initial position. In some cases, the movable blade is driven in the cutting direction of the paper to perform the cutting operation, and then the movable blade is returned in the opposite direction to return.

Such a cutter device requires a sensor to detect the initial position and the folded position of the movable blade with respect to the fixed blade, as disclosed in Japanese Utility Model Publication No. 61-35435.

[Problems to be solved by the invention] However, if a sensor is provided to detect the initial position and the folded position of the movable blade, the cost is increased and
In addition, there is a problem in that it takes a lot of man-hours for adjustment for determining the initial mounting position of the sensor. There is also a problem that the sensor interferes with the miniaturization of the device.

[Object of the Invention] An object of the present invention is to provide a cutter device capable of setting the initial position of the blade, ending the cutting operation, and returning to the initial position without providing a sensor for detecting the position of the blade. To do.

[Means for Solving the Problems] In order to achieve the above object, the present invention comprises: a first power transmission member that is rotationally driven by a drive means;
A second power transmission member that is connected to the blade and has an engagement portion that engages with the first power transmission member, and both ends of the engagement portion are released; the first power transmission member; An urging means for urging the second power transmission member in a direction in which the engaging portion is always engaged is provided, and when the blade is returned before the cutting operation of the sheet and after the sheet is cut, The power transmission member 1 is larger than the drive amount from the one end of the engaging portion to the other end of the engaging portion, and drives the driving means in the direction opposite to the cutting direction of the seat, At the time of cutting, a cutter device is configured by providing a control device that drives the driving means in the sheet cutting direction by more than the driving amount.

[Operation] Since the blade is not always stopped at the initial position before the start of the cutting operation of the sheet, the first power transmission member moves from the engagement end on one side of the engagement portion of the second power transmission member. The driving amount is greater than the driving amount to reach the engagement end on the other side, and the driving means is driven in the direction opposite to the cutting direction of the sheet.

As a result, the engagement between the engagement end and the first power transmission member is released, and even if the first power transmission member further rotates, the second power transmission member stops and the blade is initialized. .

In this state, the second power transmission member is biased by the biasing means, and the first power transmission member and the engaging portion are engaged with each other.

When the seat is cut, the driving force of the first power transmission member is larger than the driving amount from the one end of the engagement portion of the second power transmission member to the other end of the engagement portion. Drive in the cutting direction. In the meantime, after the sheet is cut, the engagement between the engagement end and the first power transmission member is released.

At the time of the blade returning operation after cutting the sheet, the first power transmission member has a driving amount larger than the driving amount from the one engagement end to the other engagement end of the second power transmission member, The driving means is driven in the direction opposite to the cutting direction of the sheet.

As a result, the engagement between the engagement end and the first power transmission member is released, and even if the first power transmission member rotates, the second power transmission member stops and the blade returns to the initial position.

[First Embodiment] A first embodiment of the present invention will be described below with reference to the drawings.
As the cutter device in this embodiment, a cutter device for cutting roll paper in a facsimile machine or a thermal copying machine will be described as an example.

<Structure> First, as shown in FIG. 1, the cutter device 10 of the first embodiment has a fixed blade 11 fixed to a frame (not shown) and a roll paper sandwiched between the fixed blade 11. Movable blade to cut 12
And a drive motor 13 as a drive means for applying power to the movable blade 12, and a transmission gear group 14 as a power transmission means connecting the drive motor 13 and the movable blade 12. A control device for performing the operation shown in FIG. 3 is provided.

The gear group 14 includes a first gear 15 provided on the output shaft of the drive motor 13, a second gear 16 meshing with the first gear 15, and a third gear 17 provided coaxially with the second gear 16. It is composed of a (first power transmission member) and a fan gear 18 (second power transmission member) as a final stage gear that meshes with the third gear 17.

The sector gear 18 has a limited meshing range due to its shape, and in the initial state shown in FIG. 1, the end meshing with the third gear 17 is the first meshing end 18a (engaging end). The other is used as the second meshing end 18b (engaging end). In the state where the second meshing end 18b meshes with the gear 17, the movable blade 12 fixed coaxially with the fan gear 18 is in a state in which the roll paper is completely cut as shown in FIG.

Further, a bias spring 19 is attached to the sector gear 18, and when the first meshing end 18a is in contact with the gear 17 as shown in FIG. 1, the sector gear 18 is biased in the direction of arrow A. As shown in FIG. 2, when the second meshing end 18b is in contact with the gear 17, the fan gear 18 is urged in the direction of arrow B. That is, the biasing spring 19 is in a neutral state when the fan-shaped gear 18 meshes with the third gear 17 at a substantially intermediate position between both meshing ends 18a and 18b, and the biasing force is applied at this intermediate position. It is supposed to be flipped.

Before the start of the cutting operation of the sheet, for example, when the power switch is turned on and when the movable blade 12 returns after cutting the sheet, the gear 17 causes the gear 17 to rotate from the first meshing end 18a to the second meshing end 18b of the sector gear 18. Is larger than the drive amount (the relative movement amount of the gear 17 and the fan-shaped gear 18) up to, and the motor 13 is driven in the direction opposite to the cutting direction of the sheet, and when the sheet is cut, the motor 13 is driven from the above-mentioned driving amount. Most of them are driven in the sheet cutting direction. The drive amount is controlled by the drive time of the motor 13, the number of rotations, the number of drive pulses of the motor 13, and the like.

<Operation> First, when the power switch (not shown) is turned on, the movable blade
Since 12 is not always stopped at the initial position, the initial position setting operation is performed.

That is, when the power switch is turned on in step S1 as shown in FIG. 3, the motor 13 is driven in the returning direction B ₁ of the movable blade 12 by a constant amount in step S2. As a result, the sector gear 18 rotates in the direction of arrow B, and even if the meshing end 18a reaches the gear 17, it is further driven. However, after the meshing end 18a meshes with the gear 17, even if the gear 17 continues to rotate, the driving force is not transmitted to the sector gear 18, and the sector gear 18 stops. After that, the motor 13 also stops.

When the motor 13 is stopped, the movable blade 12 is in the initial position as shown in FIG. In this state, the sector gear 18 is urged in the direction of arrow A by the urging spring 19, and the meshing end 18
a meshes with the gear 17.

In such a state, if the controller issues a roll paper cutting command in step S3, the drive motor is driven in step S4.
13 is driven by a certain amount in the sheet cutting direction (arrow A ₁ direction in FIG. ₁ ). This causes the movable blade 12 to rotate in the A direction,
The sheet interposed between the fixed blade 11 and the movable blade 12 is cut.

When it further rotates and reaches the position where the second meshing end 18b comes into contact with the gear 17 as shown in FIG. 2, even if the third gear 17 on the drive side continues to rotate, it is further fan-shaped. Gear 18
Does not rotate. Therefore, the movable blade 12 does not move beyond the limit shown in FIG. The biasing spring 19 reverses the biasing direction in the middle of reaching this state, and in the state of FIG.
18 is biased in the direction of arrow B.

The controller eventually gives a reverse rotation instruction to the drive motor 13 in the step S5 (arrow B ₁ direction), and the drive motor 13 reverses a certain amount,
The sector gear 18 also rotates in the direction of arrow B and returns to the initial state shown in FIG. Also at this time, when the first meshing end 18a of the sector gear 18 reaches the gear 17 before the third gear 17 on the drive side is stopped, the sector gear 18 does not rotate any more and therefore the movable blade
12 naturally stops at the initial position. In addition, in this state, the sector gear 18 has a biasing spring 19 which reverses the biasing direction midway.
Is urged in the direction of arrow A by the fan gear 18 and the third gear.
It is always in meshing relationship with 17.

<Effects of Embodiment> In this embodiment, when the power switch is turned on and when the movable blade 12 is returned after the sheet is cut, the gear 17 moves from the first meshing end 18a to the second meshing end 18b of the sector gear 18. The motor 13 is driven in the direction opposite to the sheet cutting direction, and when the sheet is cut, the motor 13 is driven in the sheet cutting direction more than the driving amount. Even if the above is not provided, the forward / reverse operation of the motor 13 can set the initial position of the movable blade 12, terminate the cutting operation, and return to the initial position.

Therefore, it is possible to manufacture the device at low cost without requiring man-hours for mounting and adjusting the sensor, and to downsize the device.

Further, the drive amount of the motor 13 may be larger than the drive amount of the gear 17 from the first meshing end 18a to the second meshing end 18b of the sector gear 18, so the drive amount of the motor 13 is set so precisely. It is easy to control without requiring.

In this embodiment, the gear 18 that is connected to the movable blade 12 at the final stage
Although the fan-shaped gear is a fan-shaped gear, the fan-shaped gear is not limited to the final-stage gear, and the gear on the driven side when viewed from the driving means,
For example, in FIG. 1, the second gear 16 may be a sector gear. Even in this case, it goes without saying that the biasing spring must be provided so as to perform the above operation.

The biasing spring 19 is not limited to the one shown in FIG.
One in which the biasing direction is reversed during the operation of the sector gear 18, for example, a leaf spring 20 as shown in FIGS. 4 (a) and 4 (b).
Alternatively, the fan gear 18 may be composed of a pair of springs that urge the gears 18 from both sides.

[Second Embodiment] Next, a second embodiment will be described with reference to FIG.

In the cutter device 30 of this embodiment, the drive gear 32 as the first power transmission member driven by the drive motor 31 has the second drive gear 32.
The gear 33 meshes with a rack 33 as a power transmission member, and the rack 33 further meshes with a gear 34. The gear 34 is connected to the movable blade 36. Incidentally, 37 indicates a fixed blade.

Further, the rack 33 is provided with biasing means 35a and 35b, and as shown in the figure, the rack 33 is always biased in the direction in which the rack 33 meshes with the gear 32.

The rack 33 has a limited meshing range with the gear to which it meshes similarly to the fan-shaped gear 18 of the first embodiment. Even if the gear 32 rotates beyond the meshing range, it does not move and the rack 36 of the movable blade 36 does not move. Since it is obvious that the rotation range is automatically limited, the description of the operation is omitted.

[Modification] The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and the following modifications are possible.

(1) The present invention is not limited to the one in which the movable blade rotates, but can also be applied to the one in which two blades relatively move or rotate, the one in which the blade slides, and the like.

(2) In the above-described embodiment, the blade is initialized when the power is turned on, but the motor 13 may be rotated in the reverse direction to perform the initialization after the power is turned on and a cutting command is issued.

Further, the initial setting operation may be performed every time the cutting is performed.

[Advantages of the Invention] The invention is a cutter device for cutting a sheet by moving a blade, a driving means, a first power transmission member rotatably driven by the driving means, and the first blade connected to the first power transmission member. A second power transmission member having both ends of the engagement portion disengaged, and the first power transmission member
Urging means for urging the second power transmission member in a direction in which the power transmission member and the engaging portion always engage with each other, and at the time of returning operation of the blade before starting the sheet cutting operation and after cutting the sheet. , The first power transmission member is larger than the driving amount from the one end of the engaging portion to the other end of the engaging portion, and drives the driving means in a direction opposite to the cutting direction of the seat. Since a control device that drives the driving means in the sheet cutting direction by more than the driving amount when cutting the sheet is provided, the driving direction of the driving means does not need to be provided even if a sensor for detecting the position of the blade is provided. Also, by controlling the drive amount, it is possible to set the initial position of the blade, end the cutting operation, and return to the initial position.

[Brief description of drawings]

1 to 4 show a first embodiment of the present invention,
FIG. 1 is an explanatory view showing a state in which the sector gear is at the first meshing end, FIG. 2 is an explanatory view of the second meshing end, FIG. 3 is a flowchart of the operation, and FIGS. ) Shows the operation of another configuration example of the biasing spring, FIG. 4 (a) is an explanatory view showing the state of the initial position, and FIG. 4 (b) is an explanatory view showing the reversal position. FIG. 5 is a block diagram of the cutter device of the second embodiment. 10 ... Cutter device (first embodiment) 11 ... Fixed blade, 12 ... Movable blade 13 ... Drive motor (driving means) 14 ... Transmission gear group (first power transmission member) 15 ... First gear 16 ... Second Gears, 17 ... Third gear 18 ... Fan gear (second power transmission member) 18a ... First meshing end 18b ... Second meshing end 19 ... Biasing spring (biasing means) 20 ... Biasing spring (others) Configuration example) 30 ... Cutter device (second embodiment)

Claims (3)

[Scope of utility model registration request] 1. A cutter device for cutting a sheet by moving a blade, a drive means, a first power transmission member rotationally driven by the drive means, and a first power transmission member connected to the blade. A second power transmission member having both ends of the engagement portion released, and the first power transmission member and the engagement portion are always engaged with each other. Urging means for urging the second power transmission member, and the first power transmission member is engaged on one side of the engaging portion during the return operation of the blade before starting the sheet cutting operation and after cutting the sheet. The driving amount is larger than the driving amount from the joining end to the engaging end on the other side, and the driving unit is driven in the direction opposite to the cutting direction of the sheet, and when the sheet is cut, the driving unit is larger than the driving amount. A cutter device having a control device for driving in a cutting direction. . 2. The cutter device according to claim 1, wherein the first power transmission member is a gear, and the second power transmission member is a fan gear meshing with the gear. 3. The cutter device according to claim 1, wherein the first power transmission member is a gear, and the second power transmission member is a rack that meshes with the gear.