JPS5943766A - Recording paper conveying device - Google Patents

Abstract

PURPOSE:To make it possible to obtain sufficient drive torque with the use of a small capacity pulse motor, by driving the pulse motor with two phase energization after the pulse motor is driven with one or two phase energization by first several hundred pulses, upon the reverse rotation of carrier rollers by the pulse motor under cutting instructions. CONSTITUTION:When a pulley 43 is rotated counterclockwise by a motor 41, a roller 29 rotates counterclockwise to progressively feed a recording paper but a gear 47 does not rotate. Simultaneously, since a gear 61 rotates counterclockwise, a feed roller 35 rotates clockwise to feed the paper. Further, although a gear 67 rotate clockwise, but it idles between itself and a shaft 62 due to an one-way clutch 66 disposed therebetween. Next, when the motor 41 reversely rotates, the roller 29 also reversely rotates to stretch the recording paper and as well to release a cutter cam follower 58 from a cam 49, so that a bracket 57 is rotated until a projection 59 abuts against a stopper 60, and therefore, the recording paper is cut by a movable cutter blade 34. At thist time, the drive of the motor with one or two phase energization offers a feed speed half as high as that with two phase energization, but produces a large torque, thereby the drive may be made with a small capacity motor.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a method for cutting and discharging continuous paper, such as a printing device a, by retracting the recording paper so that the distance between the printing section and the cutter is long. The present invention also relates to a recording paper conveying device that is capable of effectively printing over the entire surface.

[Prior art]

When a cutting command is received, the conveyance roller is reversely rotated, and the feed roller is rotated forward to apply full tension to the recording paper between them, and in this state, the cutter is fully driven. Therefore, the load when the conveyance roller is reversed is extremely large, and it is absolutely necessary to use all motors with large capacities.

[Purpose of the invention]

An object of the present invention is to provide an entire recording paper conveyance device that can obtain sufficient driving force without using all large-capacity motors. I will explain based on.

This embodiment relates to a facsimile, and the inside of the housing (1) is a scanner base. They are separated by a housing stay (2) that also serves as a housing, and are provided with a transmitter (3) at the top and a receiver (4) at the bottom.

Therefore, the upper surface of the housing (1) is a document table (5).
This document table (5) has a document guide (6).
A separating roller 7 (7) is provided with a separating roller (7), and a separating 5 (8) consisting of a pressure plate, a paper stopper, a separating pressure adjustment bottle, a separating rubber, etc. is provided on the upper part of the separating roller (7). A contact glass 01) is provided immediately in front of the document transport roller αO provided nearby. A light source 02 for document illumination and an inclined mirror 7 are provided below the contact glass 01, and a lens 04 and a fixed imaging scanning element α9 are provided on the right end side facing this mirror. There is.

Next, a roll paper storage section αQ is provided at the center of the receiving section (4). This roll paper storage section αQ is a roll paper storage box QLa[-L,
This roll paper storage box (to) is provided with two holder mounting stays that receive the circular flange part (a) of the roll paper holder 01) that holds all the recording papers wound in a rotor shape. ing. Further, the roll paper storage box 0 is formed with an upper opening notch (C) that allows the roll paper knob (C) of the roll paper holder Qη to protrude in the front direction, and the upper limit portion in the feeding direction is formed with: A feed roller (c) and a hand cutter (b) are provided.

A guide (C) is bent in an L shape to face the hand cutter (A), and below the guide is a platen roller (C) that also serves as a conveyance roller and a thermal head that serves as a printing section. (a) The two are connected to each other. The cutter 02 is attached to the guide plate 0■, which is provided so as to be expanded toward the thermal head {circle around (2)} side. That is, this cutter 0→ consists of a fixed blade (to) and a rotating movable blade (b). A feed roller (c) consisting of a pair of rollers is provided on the discharge side of the cutter 02.

Next, the thread path of the recording paper and its movement will be explained based on FIGS. 2 to 8. First, the guide (to) facing the hand cutter is made up of an upper guide plate (b) and a lower guide plate (b). It is bent and
The lower guide plate (3 pieces) is extended to a length close to the introduction part (B) between the platen roller cover and the thermal head (G), and the upper guide plate (to) is formed short so that the introduction part (B) is An opening (A) is formed between the part (G) and the part (G).

However, what is shown in FIG. 3 is a partial view of the apparatus shown in FIG. 1 from the rear side, and FIG. 4 is a plan view thereof. First, the drive pulleys of the motor θ◇, which is a pulse motor attached to the back plate 00, and the platen pulley are connected by a transmission belt. The platen pulley sakaki is integrally connected to the platen roller holder, and the delivery pulley (9) around which the delivery transmission belt (T) is wound is also integrally connected to the platen opening holder. There is. This platen roller (A) is provided with a platen gear Q through a one-way clutch so that power is transmitted only when the platen roller blade rotates clockwise. and a cutter cam O1 are integrated!], a cutter gear Q'fJ is provided on the platen roller with a one-way latch interposed therebetween. Idler gear wheels are provided which mesh with each other, and are meshed so that the rotational speed of the cutter gear is increased relative to the rotational speed of the platen roller. Further, a recessed portion is formed on the circumference of the switch plate α→, and the actuator of the cutter position switch is provided in the recessed portion so as to engage and disengage it.

Next, the cutter bracket ( ) is fixed to the support shaft (to) and is biased clockwise by a tension spring (to), and at this cutter bracket, the outer periphery contacts a cutter cam (to) formed in a spiral shape. A cutter cam follower trowel is attached. A movable blade (b) is fixed to the support shaft (b). In addition, the cutter bracket □□□
A cutter stopper is provided with which the protruding member comes into contact to set its maximum rotation angle.

Next, what is shown in FIG. 5 is the drive system of the feed roller (C), and the direction thereof is as seen from the rear side as in FIG. 3. First, the feed-out transmission belt ■ is gear 6.
The gear (fil) is attached to the shaft of the delivery roller (b) with a one-way clutch interposed therebetween. In other words, when the gear shaft rotates clockwise, no power is transmitted to the shaft part ■, and the gear O■
When rotates counterclockwise, power is transmitted to the shaft (Q). Then, the gear (6) is meshed with the idler gear, another idler gear is meshed with this idler gear O◆, and this The idler gear is meshed with a gear attached to the shaft through a one-way clutch C4.This gear does not transmit all of the power to the shaft when rotating clockwise. , the entire power is transmitted when rotating in the W1 direction for a long time.

Therefore, the feeding state of the recording paper (A) corresponds to the distance between the cutting position and the printing part after the recording paper (A) is printed by the rotation of the platen roller while being conveyed and fed, and is cut by the cutter (A). In order to reduce the amount of blank space, all of the recording paper (A) is returned to a predetermined size, and at the same time, the recording paper (1) beyond the 6th cutter is fed out [-Row 200
The discharge operation is performed by this.

This state will be described with reference to Figures 3 to 8.
Since the direction is opposite to that shown in the figure, the rotation direction will be explained in 1 reverse direction (-).
When the platen pulley (2) rotates counterclockwise due to temperature, the platen gear (0) does not rotate and the platen roller (1) rotates counterclockwise to feed the recording paper (A) in the forward direction.

At the same time, the gear portion η rotates counterclockwise via the feed transmission bell II, and as a result, the feed roller (c) rotates counterclockwise to feed the paper. In this state, as shown in FIG. 7, the gear shaft rotates clockwise through the idler gear M', but rotates moderately between it and the shaft stem due to the one-way clutch ring.

Next, when the motor 0) is reversed, the platen roller is reversed and the recording paper is fully extended, and at the same time the cutter cam follower is removed from the cutter cam (c), and the tension of the tension spring causes the protrusion to move to the stopper ta. Cutter bracket e? until it makes contact? ) Full rotation. As a result, the movable blade (b) completely cuts the recording paper (1). Looking at the driving state of the motor 01) 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. That is, 1-2
Driving by phase excitation is slower than two-phase excitation, but the generated torque is large, and even a small capacity motor α can be sufficiently driven in response to a large load at the start of reverse rotation.

Further, the reverse rotation of the motor θ continues until the unrecorded portion at the leading end of the cut recording paper reaches a predetermined length. At this time, gear O◇ is driven clockwise, but without transmitting the driving force to shaft Q by one-way clutch H, gear ■ rotates counterclockwise via idler gear [4]. As a result, the feed roller (b) rotates counterclockwise. As a result, the cut and printed recording paper (E) is ejected.

However, if we look at the state in which the recording paper (A) is returned in Figure 2, normally the return force of the platen roller (G) will cause the recording paper (C) to be reversed and the roll paper to be stored. The recording paper Hk is slackened in the portion 06.

However, when the rigidity of the recording paper is low, when the load on the feed roller (c) is heavy, when the load on the guide is large, etc. It deforms into a V-shape. Since the direction of this deformation coincides with the curl direction of the recording paper (1), the deformation easily occurs in the opening member and does not cause a jam. Moreover, since the deformation position is close to the recording paper (a) and the platen roller (e) that generates the feeding force for the recording paper K, the movement is good when the recording paper is fed in the forward direction again. Also, when inserting the recording paper (1), the recording paper (
Since the tip of 1) is curled in the direction of contact with the lower guide plate, even if there is an opening (A), it will be securely connected to the introduction part (to).
will be guided to.

〔Effect of the invention〕

As described above, the present invention connects the transport roller that rotates forward and backward, the feed-out roller that rotates only in the forward direction, to a pulse motor through a fully interlocking mechanism, and when the pulse motor reverses the transport roller, the first few hundred pulses are Since the motor is driven with 1-2 phase excitation and then with 2-phase excitation, a large generated torque can be obtained at the beginning of reverse rotation when the load is large.
This also improves the starting characteristics of the pulse motor itself, and then 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 valsmoke. It is something that can be done.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional front view of a facsimile machine, FIG. 4 is a plan view of the rear view, FIG. 5 is a rear view of the drive system of the delivery roller as seen from the rear, FIG. 6 is a partially cutaway plan view, and FIGS. 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 L roller, 41...Motor (pulse motor) Applicant: Ricoh Co., Ltd.

Claims (1)

[Claims] A conveyance roller that rotates in forward and reverse directions, a printing section, a cutter, and a feed-out roller that sequentially feeds the recording paper regardless of whether the conveyance roller is driven in the forward or reverse direction are arranged in sequence, and the feed-out roller and the conveyance roller are arranged in sequence. is connected to a pulse motor via an interlocking mechanism, and when the pulse motor reverses the conveyance roller, the first several hundred pulses are driven by 1-2 phase excitation and then driven by 2-phase excitation. Recording paper conveyance device.