JP2929551B2 - Rotary blade drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention is provided in a roll paper feeder that feeds and feeds roll paper to an image forming apparatus and cuts it with a rotary blade, and drives the rotary blade. The present invention relates to a rotary blade drive device.

<Related Art> Conventionally, in an image forming apparatus, a cut sheet is fed by a cassette sheet feed or a manual feed sheet. However, as the size of the cut sheet increases, the cut sheet can be stored more widely. Space was needed.

Therefore, there has been proposed a roll paper feeder that is provided continuously to the paper feed port side of the image forming apparatus, feeds out and feeds roll paper, and cuts the fed roll paper at a predetermined length by a rotary blade. .

The rotary blade driving device drives the rotary blade to cut the fed roll paper, and after the cutting, as shown in FIG. 6, causes the rotary blade 94 to rotate the next roll paper P. The so-called spring clutch, which can be stopped at a cut standby position (indicated by a solid line in the drawing) that allows passage, can perform such intermittent operation with a simple structure at low cost.

By the way, it is desirable that the cut standby position of the rotary blade 94 has high positional accuracy. This is because the length of time required for the rotary blade 94 to rotate from the cutting standby position (shown by the solid line in FIG. 6) to the cutting start position (shown by the broken line in FIG. 6) depends on the above positional accuracy. And
This is because the timing of cutting the roll paper P is shifted, and the cut length of the roll paper P is incorrect.

<Problems to be Solved by the Invention> However, as shown in FIG.
A gear 93 that rotates integrally with a shaft 92 provided with a spring clutch 91 connected to the drive side 90 is meshed with a gear 96 that rotates integrally with a drive shaft 95 of the rotary blade 94. Drive shaft 9 of the rotary blade 94 via the gears 93 and 96
Power was transmitted to 5.

Therefore, in order to increase the positional accuracy of the cutting standby position of the rotary blade 94, it is necessary to adjust the meshing position of the teeth of the two gears 93 and 96. A shift of one tooth in the rotational position could not be avoided. Therefore, in order to increase the above accuracy,
At the time of assembling the driving device, in a state where the rotary blade 94 is held at the cut standby position and the two gears 93 and 96 are engaged with each other, for example, the connection position of the shaft 92 and the spring clutch 91 is adjusted,
Fine adjustment such as adjustment of the connection position between the
Assembly was troublesome.

The present invention has been made in view of the above problems,
It is an object of the present invention to provide a rotary blade driving device that does not require position adjustment of a cut standby position at the time of assembling, and has high position accuracy of the cut standby position.

<Means for Solving the Problems> A rotary blade driving device according to the present invention for solving the above-described problem is to rotate the rotary blade so as to cut the fed roll paper, and to rotate the rotary blade after the cutting. In a power transmission device that is stopped at a cutting standby position that allows the next roll paper to pass, a driving-side rotating body that is driven and rotated in one direction, and a driving blade that is provided concentrically with the driving-side rotating body and drives the rotary blade The driven-side rotator that rotates integrally with the shaft, the drive-side rotator and the driven-side rotator are externally fitted over the rotator, and one end is fixed to the driven-side rotator and contracted with the rotation of the drive-side rotator. A coil spring having a diameter, a cylindrical sleeve to which the coil spring is inserted, the other end of the coil spring is fixed, and the sleeve is stopped at a predetermined rotation position to expand the diameter of the coil spring. Driven side And a stopping operation means for stopping the rotating body at a predetermined rotation position, stopping the rotating blade at the cutting standby position, and releasing the stopping of the sleeve and the driven-side rotating body. It is.

<Operation> According to the rotary blade driving device having the above-described configuration, in a state where the stopping of the sleeve and the driven-side rotating body by the stopping operation means is released, the coil spring whose diameter is reduced with the rotation of the driving-side rotating body. The driving force is transmitted from the driving-side rotator to the driven-side rotator via, whereby the rotary blade is driven and rotated to cut the roll paper. Then, after this cutting, the stopping operation means stops at the predetermined rotation position of the sleeve, expands the diameter of the coil spring, and releases the drive connection between the driving-side rotating body and the driven-side rotating body. The operating means stops the driven blade at the predetermined rotation position, whereby the rotary blade can be stopped at the cutting standby position.

The stop of the rotary blade at the cutting standby position is performed by stopping the driven-side rotating body that rotates integrally with the drive shaft of the rotary blade, and, as in the related art, between the driven-side rotary body and the rotary blade. Since the gears meshing with each other are not interposed, it is possible to prevent the relative position between the driven rotary member and the rotary blade from being shifted due to the gear meshing position.

Therefore, the position accuracy of the cutting standby position is high,
Moreover, there is no need to adjust the cutting standby position during assembly.

Embodiments will be described below with reference to the accompanying drawings showing embodiments.

FIG. 3 shows a roll paper feeding device including a rotary blade driven by a rotary blade driving device according to one embodiment of the present invention. Referring to FIG. Is connected to the paper feed port 2 side of the copying machine main body 1,
The roll paper P is fed from the take-up roll 3 to the paper feed port 2 side through the paper passage 4 and the paper discharge unit 5, and the fed roll paper P is cut at a predetermined timing by the rotary blade 6 and the fixed blade 7. I do.

Referring to FIG. 2 and FIG. 3, the rotary blade 6 is
And a torsion blade body 62 is formed on a cylindrical roller 61 whose peripheral surface is partially cut away to allow the passage of the roll paper P. The fixed blade 7 is provided with a straight blade 71 that cuts the roll paper P with the torsion blade 62 of the rotary blade 6.

Referring to FIGS. 1 and 2, a rotary blade driving device B that drives the rotary blade 6 includes a cylindrical driving-side rotating body 10 that is rotationally driven by a driving system via a gear portion G, and A driven side rotating body 11 that is arranged concentrically with the side rotating body 10 and that is driven by the driving side rotating body 10, a drive shaft 15 that connects the driven side rotating body 11 and the rotary blade 6 so as to be integrally rotatable, A coil spring 12 externally fitted to the rotating body 10 and the driven-side rotating body 11, a cylindrical sleeve 13 externally fitted to cover the coil spring 12, and an engagement portion 13a of the sleeve 13 To stop the sleeve 13 at the predetermined rotation position, and
The locking operation means 14 engages with the locking portion 11a of the motor 11 and stops at the predetermined rotation position, and stops the rotary blade 6 at the cutting standby position (see FIG. 3). And a bush 16 that is fitted and rotatably supports the drive shaft 15.

One end 12a of the coil spring 12 is
The other end portion 12b is engaged with the groove portion of the sleeve 13.
13b is engaged. The winding direction of the coil spring 12 is set in a direction in which the diameter is reduced with the rotation of the driving-side rotating body 10.

The drive shaft 15 for connecting the rotary blade 6 and the driven-side rotating body 11
Has a flat cut surface 15a extending in the axial direction, an inner hole 11c of the driven-side rotating body 11 is formed in the same cross-sectional shape as the drive shaft 15, and the driven-side rotating body 11 and the drive shaft The positional relationship with 15 is determined accurately. The drive shaft 15 inserted into the inner hole 11c is stopped by screws 17 abutting on the cut surface 15a. An inner hole (not shown) having the same cross-sectional shape as the drive shaft 15 through which the drive shaft 15 is inserted is also formed at an end of the rotary blade 6, and the positional relationship between the rotary blade 6 and the drive shaft 15 is formed. Is determined with high accuracy. Therefore, the positional relationship between the rotary blade 6 and the driven-side rotator 11 is also determined with high accuracy.

With reference to FIGS. 2 and 4, the stopping operation means 14 is provided with a locking position (a solid line in FIG. 4) for engaging with the locking portion 13a of the sleeve 13 and the locking portion 11a of the driven-side rotator 11. ) And the release position for releasing the engagement (indicated by the two-dot chain line in FIG. 4)
A locking member 18 that is movable across
Tension coil spring 20 for urging the locking position side,
And a solenoid 19 connected to the locking member 18.

The solenoid 19 is excited at a predetermined timing after the input of the cut signal, and releases the locking of the locking member 18 with the locking portion 13a of the sleeve 13 against the tension coil spring 20; Is demagnetized immediately after passing through the locking member 18, and is controlled so that the locking member 18 is switched to the locking position. Also, with the locking member 18 in the locking position,
The locking portion 11a of the driven-side rotating body 11 is also locked by the locking member 18 so that the driven-side rotating body 11 is stopped. In this stopped state, the rotating blade 6 The positional relationship between the locking portion 11a and the rotary blade 6 is set so as to be accurately positioned at the cutting standby position.

According to this embodiment, when a cut signal is input to the solenoid 19 and the locking of the locking member 18 with the locking portion 13a of the sleeve 13 is released, the diameter of the coil spring 12 is reduced accordingly. Accordingly, the driven-side rotating body 11 is driven by being driven by the driving-side rotating body 10, whereby the rotary blade 6 is driven to rotate, and the roll paper P is cut into a predetermined length.

On the other hand, when the rotary blade 6 reaches just before the cut standby position, the locking member 18 is locked to the locking portion 13a of the sleeve 13, and the rotation of the sleeve 13 is stopped. By expanding the diameter, the driven drive of the driven-side rotating body 11 is stopped, and the drive transmission is cut off.

Then, immediately after the driven drive of the driven-side rotator 11 is stopped, the locking portion 11a of the driven-side rotator 11 that is rotating by inertia is
By being locked by the locking member 18, the rotation of the driven-side rotator 11 and thus the rotary blade 6 is stopped, the rotary blade 6 is stopped at a predetermined cutting standby position, and the next roll paper P is cut. Prepare for.

Conventionally, the intermeshing gears are interposed between the driven-side rotating body 11 and the drive shaft 15 of the rotary blade 6, so that the positional accuracy of the cut standby position is poor due to the shift due to the meshing position of the gears. In order to increase the positional accuracy, when assembling the driving device, for example, it was necessary to finely adjust the positional relationship between the driven-side rotator 11 and the driving shaft 15, but in the present embodiment, the rotary blade at the cut standby position is required. 6 is the rotating blade 6
This is performed by stopping the driven-side rotator 11 that rotates integrally with the drive shaft 15 of the drive shaft 15. Since no gear is interposed between the driven-side rotator 11 and the rotary blade 6, the displacement caused by the meshing of the gears is caused. Therefore, the position accuracy of the cut standby position is high, and it is not necessary to adjust the cut standby position during assembly.

Note that the present invention is not limited to the above-described embodiment. For example, the gist of the present invention is provided, for example, by providing an adjusting means for adjusting a relative rotation position between the driven-side rotating body 11 and the drive shaft 15. Various design changes can be made within the range not changed.

<Effect of the Invention> According to the present invention, the stop of the rotary blade at the cut standby position is performed by stopping the driven-side rotary body that rotates integrally with the drive shaft of the rotary blade. Since no gear is interposed between the driven rotating body and the rotary blade to be stopped, it is possible to avoid occurrence of a shift in the relative position between the driven rotating body and the rotating blade due to the meshing of the gears. Therefore, there is a unique effect that the position accuracy of the above-described cut standby position is high, and it is not necessary to adjust the cut standby position during assembly.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a rotary blade driving device according to one embodiment of the present invention, FIG. 2 is a partial cross-sectional side view showing the rotary blade driving device and the rotary blade, and FIG. FIG. 4 is a schematic sectional view of a rotary blade driving device and a cutting mechanism, FIG. 5 is a schematic diagram showing a schematic configuration of a conventional driving device, and FIG. 6 is a schematic diagram showing an operation of the rotary blade. . 6 ... rotating blade, 10 ... driving side rotating body, 11 ... driven side rotating body, 12 ... coil spring, 12a ... one end, 12b ... other end, 13 ... sleeve, 14 ... stop Fixed operation means.

Claims (1)

(57) [Claims] (1) In order to cut out the rolled paper,
A rotary blade driving device for rotating a rotary blade and stopping the rotary blade at a cutting standby position that allows the next roll paper to pass after the cutting, wherein a driving side driven and rotated in one direction by a driving system A rotating body; a driven-side rotating body provided concentrically with the driving-side rotating body and integrally rotating with the drive shaft of the rotary blade; A coil spring fixed to the driven-side rotating body and reduced in diameter with the rotation of the driving-side rotating body; a tubular sleeve in which the coil spring is inserted and the other end of the coil spring is fixed; The sleeve is stopped at a predetermined rotation position, the coil spring is expanded in diameter, the driven-side rotating body is stopped at the predetermined rotation position, the rotary blade is stopped at a cutting standby position, and the sleeve and the driven-side rotation are stopped. Body cessation Rotary blade drive device characterized by comprising a release to a stopping operation means.