JPS6327248B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is applicable to a printing device that cuts and discharges continuous paper, by retracting the recording paper so that it can be printed on the entire surface even if the distance between the printing section and the cutter is long. The present invention relates to a recording paper conveyance device that enables effective printing across the paper.

[Prior art]

Generally, this type of device is equipped with a conveyance roller, a cutter, and a feed roller that rotate forward and backward in accordance with the conveyance direction of the recording paper, and when a cutting command is received, the conveyance roller is reversed and the feed roller is rotated forward. This applies tension to the recording paper between the two, and in this state the cutter is driven. Therefore, the load when the conveyance roller is reversed is extremely large, and a motor with a large capacity must be used.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording paper conveyance device that can obtain sufficient driving force without using a large capacity motor.

[Embodiments of the invention]

An embodiment of the present invention will be described based on the drawings. The present embodiment relates to a facsimile machine, and the inside of a housing 1 is divided by a housing stay 2 which also serves as a scanner base, with a transmitting section 3 provided above and a receiving section 4 provided below.

Therefore, the upper surface of the housing 1 has a document table 5.
The document table 5 is provided with a document guide 6. A separating section 8 consisting of a pressure plate, a paper stopper, a separating pressure adjustment pin, a separating rubber, etc. is provided on the upper part of the separating roller 7.
A contact glass 11 is provided immediately in front of the contact glass 11. A light source 12 for document illumination and an inclined mirror 13 are provided below the contact glass 11, and a lens 14 is provided on the right end side facing the mirror.
and a fixed imaging scanning element 15.

Next, in the center of the receiving section 4, a roll paper storage section 16 is provided. The roll paper storage section 16 has a roll paper storage box 19 that is provided so as to be movable back and forth by a slide rail 17 and an auxiliary rail 18. Circular flange portion 2 of roll paper holder 21 that holds paper 20
Two holder placement stays 23 for receiving 2 are provided. In addition, the roll paper storage box 1
9 has an upper opening notch 25 that allows the roll paper knob 24 of the roll paper holder 21 to protrude forward.
is formed, and at the upper corner in the feeding direction,
A feed roller 26 and a hand cutter 27 are provided.

A guide 28 is bent into an L-shape to face the hand cutter 27, and below this guide 28 is a platen roller 29 that also serves as a conveyance roller and a thermal head 30 that serves as a printing section.
The two ends are connected to each other. A cutter 32 is attached to a guide plate 31 that is expanded toward the thermal head 30 side. That is, this cutter 32 is composed of a fixed blade 33 and a movable blade 34 that rotates. A feed roller 35 consisting of a pair of rollers is provided on the discharge side of the cutter 32.

Next, based on Figures 2 to 8, record paper 2
The path of 0 and its movement will be explained. First, the guide 28 facing the hand cutter 27 consists of an upper guide plate 36 and a lower guide plate 37. This guide 28 is bent along the curl direction of the recording paper 20, and the lower guide plate 37 The upper guide plate 36 extends close to the introduction section 38 between the platen roller 29 and the thermal head 30, and an opening 39 is formed between the upper guide plate 36 and the introduction section 38. ing.

What is shown in FIG. 3 is a part of the apparatus shown in FIG. 1 seen from the rear side, and FIG. 4 is a plan view thereof. First, the drive pulley 4 of the motor 41 consisting of a pulse motor attached to the back plate 40
2 and the platen pulley 43 are connected by a transmission belt 44. The platen pulley 43 is integrally connected to the platen roller 29, and the delivery pulley 46 around which the delivery transmission belt 45 is wound is also integrally connected to the platen roller 29. A platen gear 47 is provided on the platen roller 29 with a one-way clutch interposed therebetween so that power is transmitted only when the platen roller 29 rotates clockwise.
A cutter gear 50 in which a switch plate 48 and a cutter cam 49 are integrated is connected to the platen roller 29.
A one-way clutch is interposed between the two.
and an idler gear 51 that meshes with the platen gear 47 and the cutter gear 50, respectively;
52 is provided and meshed with the cutter gear 50 so that the rotation speed of the cutter gear 50 is increased relative to the rotation speed of the platen roller 29. Further, a recess 53 is formed on the circumference of the switch plate 48, and is provided so that the actuator of the cutter position switch 54 can be engaged and disengaged.

Next, a cutter bracket 57 biased clockwise by a tension spring 56 is fixed to the support shaft 55.
A cutter cam follower 58 is attached to the cutter bracket 57 and is in contact with the cutter cam 49 whose outer periphery is formed in a spiral shape. The movable blade 34 is fixed to the support shaft 55. Further, the protruding piece 5 of the cutter bracket 57
A cutter stopper 60 is provided, with which the cutter stopper 9 abuts and its maximum rotation angle is set.

Next, the one shown in FIG.
5, and its direction is as seen from the rear side as in FIG. First, the feed-out transmission belt 45 is wound around the body of a gear 61.
2 with a one-way clutch 63 interposed therebetween. That is, when the gear 61 rotates clockwise, no power is transmitted to the shaft portion 62, and the gear 61 rotates clockwise.
1 rotates counterclockwise, power is transmitted to the shaft portion 62. The gear 61 is meshed with an idler gear 64, and the idler gear 64 is engaged with the idler gear 64.
4 is meshed with another idler gear 65, and this idler gear 65 is meshed with a gear 67 attached to the shaft portion 62 via a one-way clutch 66. This gear 67 does not transmit power to the shaft portion 62 when rotating clockwise, but transmits power when rotating counterclockwise.

Therefore, the feeding state of the recording paper 20 is such that printing is performed while the recording paper 20 is being fed by the rotation of the platen roller 29, and after being cut by the cutter 32, a margin portion corresponding to the distance between the cutting position and the printing section is cut. In order to reduce the number of sheets, the recording paper 20 is returned by a predetermined size, and at the same time, the recording paper 20 beyond the cutter 32 is ejected by the feed roller 35.

This state will be described with reference to FIGS. 3 to 8, but since the orientation is opposite to that shown in FIG. 2, the rotation direction will be explained in the opposite direction. First, when the platen pulley 43 is rotated counterclockwise by the motor 41 driven by two-phase excitation, the platen gear 47 does not rotate, and the platen roller 29 rotates counterclockwise to feed the recording paper 20 in the forward direction. At the same time, the gear 61 rotates counterclockwise via the feed transmission belt 45, thereby causing the feed roller 35 to rotate counterclockwise to feed the paper. This state is shown in FIG. 7, and the idler gears 64, 65
The gear 67 rotates clockwise with
A one-way clutch 66 causes idle rotation between the shaft portion 62 and the shaft portion 62 .

Then, when the motor 41 reverses, the platen roller 29 reverses and spreads the recording paper 20, and at the same time the cutter cam follower 58 moves the cutter cam 4.
9, and the cutter bracket 57 is rotated until the protrusion 59 comes into contact with the stopper 60 due to the tension of the tension spring 56. As a result, the movable blade 34 cuts the recording paper 20. Looking at the driving state of the motor 41 at this time, it is driven for several hundred pulses by 1-2 phase excitation simultaneously with the reverse rotation command, and then driven by 2-phase excitation. In other words, the speed of driving by 1-2 phase excitation is 1/2 that of 2-phase excitation, but the generated torque is large, and even a small capacity motor 41 can handle the large load at the start of reverse rotation. It is possible to drive.

Further, the reverse rotation of the motor 41 continues until the unrecorded portion at the leading end of the cut recording paper 20 reaches a predetermined length. At this time, the gear 61 is driven clockwise, but the idler gear 64,
The gear 67 rotates counterclockwise via the gear 65, thereby causing the delivery roller 35 to rotate counterclockwise. As a result, the cut and printed recording paper 20 is discharged.

However, if we look back at FIG. 2 to see how the recording paper 20 is returned, normally the platen roller 29
The feed roller 26 is reversed by the returning force of
The recording paper 20 is slackened in the roll paper storage section 16. However, when the rigidity of the recording paper 20 is low, when the load on the feed roller 26 is large, when the load on the guide 28 is large, the recording paper 20 deforms into a V-shape at the opening 39 as shown in the figure. Since this deformation direction coincides with the curl direction of the recording paper 20, the deformation occurs at the opening 39.
This easily occurs in the environment, so it does not cause jamming. Furthermore, since the deformation position is near the platen roller 29 that generates a feeding force on the recording paper 20, the movement when forward feeding is performed again is good. Further, when the recording paper 20 is inserted, since the leading edge of the recording paper 20 is curled in the direction of contacting the lower guide plate 37, even if the opening 39 exists, the recording paper 20 is reliably guided to the introduction section 38.

〔Effect of the invention〕

The present invention connects the transport roller that rotates in forward and reverse directions and the feed-out roller that rotates only in the forward direction to a pulse motor via an interlocking mechanism as described above, and when the pulse motor reverses the transport roller, the first few hundred pulses are - Since the drive is started with two-phase excitation and then driven with two-phase excitation, a large generated torque can be obtained at the beginning of reverse rotation when the load is large, and this also improves the starting characteristics of the pulse motor itself. After that, it returns to two-phase excitation, so there is no problem in terms of processing speed, and sufficient driving force can be obtained with a small-capacity pulse motor.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a longitudinal sectional front view of a facsimile machine, Fig. 2 is an enlarged longitudinal sectional front view of a part of the recording paper path, and Fig. 3 is a diagram showing the drive system with the cutter. 4 is a plan view of the drive system of the feed roller, 6 is a partially cutaway plan view, 7 and FIG. 8 is an explanatory diagram showing the driving force transmission state of each part. 20...Recording paper, 29...Platen roller (conveyance roller), 30...Thermal head (printing section),
32...Cutter, 35...Feeding roller, 4
1...Motor (pulse motor).

Claims (1)

[Claims] 1. One drive source consisting of a pulse motor that rotates in the forward and reverse directions; a conveyance roller that is connected to the drive source via a coupling mechanism and that rotates in the forward and reverse directions as the drive source rotates in the forward and reverse directions; A feed roller that rotates in a direction to feed the recording paper, and a cutter that is positioned between the conveyance roller and the feed roller and cuts the recording paper when the conveyance roller is reversed, and the conveyance roller is driven by the drive source. What is claimed is: 1. A recording paper conveyance device characterized in that when the recording paper is reversed, the first several hundred pulses are driven by 1-2 phase excitation, and then the recording paper conveyance device is driven by 2-phase excitation.