JPS62100332A - Paper feeding device for printer - Google Patents

Abstract

PURPOSE:To obtain a small-sized and inexpensive paper feeding mechanism of an automatic paper feeding apparatus by allowing the paper feeding mechanism for cut paper sheets to be connected to the paper feeding mechanism for a continuous paper sheet through a clutch mechanism, and thus avoiding the need of a motor for the exclusive use for drive of the paper feeding mechanism for the continuous paper sheet. CONSTITUTION:In the feed of cut paper sheets, the cut paper sheets 6 acommodated in a cassette 5 are supplied one by one into a printer body 1 through a guide roller rotatably installed onto a shaft 10 by a feed roller 7 driven by the revolution of a feed roller shaft 8 and supplied into a paper feeding mechanism for a continuous paper sheet. Then, the paper feeding mechanism for the continuous paper sheet in the printer body 1 consists of a paper feeding roller 11 driven by a driving shaft 12, pressing roller 13, paper discharge roller 17 driven by a driving shaft 18, and a pressing roller 19, and the paper feeding roller 12 and the paper discharging roller 17 are driven, interlocked with one driving motor. Thus, added with the continuous paper sheet as printing paper sheet, also the cut paper sheets accommodated in the cassette can be automatically supplied by the same motor, and the small-sized apparatus can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a printer, and more particularly to a paper feeding device for a printer that prints on cut paper stored in a cassette in addition to continuous paper. .

(Prior Art) Conventionally, printers have used continuous paper such as []-le or 7-fold paper and cut paper that is manually fed one sheet at a time as printing paper. Recently, automatic paper feeding devices have been used to feed cut sheets stored in removable cassettes one by one to a printing unit for printing.

Automatic paper feeding lS! The cut sheets are fed one by one from the cassette 1 of the machine to a paper feeding mechanism for feeding and discharging continuous paper by a feed roller, and are fed to and discharged from the printing section by the paper feeding mechanism.

Therefore, the feeding of cut paper by the feed roller in the automatic paper feeder stops when the cut paper reaches the continuous paper feeding mechanism, and the cut paper is fed at a constant rate by the continuous paper feeding mechanism. It has been necessary for the cut paper to be activated again after it has been fed in order to smoothly feed and eject the cut paper from the printing area.

For this reason, conventional automatic paper feeders are provided with a dedicated motor, clutch, etc. for controlling the rotation of the feed roller.

(Problems to be Solved by the Invention) However, as described above, providing a dedicated drive mechanism for the paper feeding mechanism of the automatic paper feeding device results in an increase in the size of the eight-position paper feeder and increased cost.

The present invention was created as a result of intensive studies in view of the current situation as described above, with the aim of reducing the size and cost of a paper feeding mechanism in an automatic paper feeding device.

(Structure of the Invention) In other words, the present invention has a first paper feeding mechanism that feeds and discharges continuous paper to and from a printing section, and a first paper feeding mechanism that feeds and discharges cut sheets stored in a cassette one sheet at a time. The second paper feeding groove is in contact with the first paper feeding mechanism via a clutch mechanism, and the clutch mechanism further registers the print head. This paper feeding device for a printer is characterized in that it operates in conjunction with the movement of a carriage in an axial direction relative to a support shaft.

(Function) The present invention is constructed as described above, and the cut paper feeding mechanism is connected to the continuous paper feeding mechanism via the clutch mechanism, so that the cut paper feeding mechanism is connected to the continuous paper feeding mechanism. There is no need to provide a dedicated motor.

Furthermore, since the clutch mechanism is operated in conjunction with the movement of the carriage on which the print head is mounted, which reciprocates in the axial direction on the support shaft for printing operations, the operating state of the paper feed mechanism is controlled. can be controlled accurately to ensure smooth paper feeding operation.

(Example) Fig. 1 shows a printer equipped with a paper feeding device of the present invention, where 1 is the main body of the printer device equipped with a printing unit for printing paper, and 2 is an automatic paper feeding device for cut paper. be.

First, the feeding of cut sheets will be explained based on FIG. 1. The cut sheets 6 stored in the cassette 5 are rotated one by one @10 by a feed roller 7 driven by the rotation of a feed roller shaft 8. Installed guide roller 9
The paper enters the main body 1 of the printer through the paper feeder structure for continuous paper.

The paper feeding mechanism for continuous paper in the printer main body 1 is driven by a drive I.
A paper feed roller 11 and a press roller 13 driven by a sleeve 12 and a paper discharge roller 17 driven by a drive shaft 18
and a presser roller 19. Of course, the paper feed roller 12 and the paper discharge roller 17 are driven in conjunction with one drive motor.

14, 15 and 20 are paper guides, and a paper detector 16 is attached to the paper guide 15.

A carriage 22 is reciprocally mounted on guide shafts 23 and 24, and a print head 21 having a print wire as a character forming element is mounted on the carriage 22! The foot is fixed.

An ink-impregnated platen 25, which forms a printing surface by mounting an ink-impregnated porous body 26 impregnated with ink of each color on its outer periphery facing the print head 21, is mounted on a Braden shaft 27, and is arranged to carry printing paper. By selectively hitting the printing surface of the ink-impregnated platen 25 with the printing wire A7 of the printing head 21, characters, figures, etc. are printed on the printing paper in a predetermined color.

Although an ink-impregnated platen type mechanism is shown as the printing groove in the printing section, it is of course possible to use a mechanism using an ink ribbon.

Now, the cut paper 6 fed from the automatic paper feeder fH2 to the printer main body 1 as described above is fed by the paper feed roller 11 and the presser roller 13, and the paper detector 16 detects the cut paper 6.
When the paper 6 is detected, the drive of the feed roller 17 is stopped by the action of a clutch mechanism which will be described in detail later.

Next, the cut paper 6 is fed by the paper feed roller 11 and the presser roller 13, and when the leading edge reaches the paper ejection roller section and the paper ejection by the paper ejection roller 17 and the presser roller 19 starts, the print head is moved. The printing operation by 21- is started.

When printing on the paper 6 is completed by feeding by the paper feed roller 12, the press roller 13, the paper discharge roller 17, and one press roller, and the carriage returns to a predetermined position, a clutch mechanism is activated, which will be described in detail later. The feed roller 7 of the automatic paper feeding device 2 is driven again, and the paper 6 is fed to the continuous paper feeding mechanism in the printer main body 2.

In addition, when printing on continuous paper, after the continuous paper inserted from the front opening 28 h of the printer main body 1 passes through the gap 4 between the printer main body 1 and the auxiliary base 3 and reaches the feed M1 mechanism section, the paper feed roller 11, presser roller 13, discharge roller 17, and presser roller 19 perform feeding.

FIG. 2 shows a first paper feeding mechanism and an automatic paper feeding device 2 provided in the printer main body 1 that feeds and discharges continuous paper to and from the printing section. 2 shows a clutch mechanism that connects the second sheet feeding mechanism that feeds the cut sheets arranged in the first sheet feeding mechanism one by one to the first sheet feeding mechanism.

The driving force transmitted to the paper feed roller shaft 12 by a motor (not shown) is transmitted to the paper feed roller 11 fixed to the paper feed roller shaft 12, and at the same time, the driving force is also transmitted to the paper feed roller 11 fixed to the paper feed roller shaft 12. The paper feed gear 29 is also transmitted to the paper feed gear 29.
9 rotates.

31, 32, and 33 are intermediate wheels rotatably mounted around a shaft 36 for transmitting the driving force of the feeding teeth [1 This is an intermediate gear rotatably mounted on the gear carriage 30 via shafts 34, 35, 36, and the intermediate gear 31 engages with the paper feed tooth 129 by the action of the toggle spring 38, and the paper feed tooth width is extended. The driving force transmitted to 29 is transmitted to feed roller gear 37.

The first paper feeding mechanism provided in the printer main body 1 and the second paper feeding mechanism provided in the automatic paper feeding device 2 can be connected or separated by operating a lever part 30a of the intermediate gear rest 30 and toggling. This is done by engaging or separating the intermediate gear 31 and the feed m gear 29 by the action of the spring 38.

Therefore, when printing on cut paper, the intermediate m?
J! 31 and the paper feed gear 29 are in an engaged state by operating the lever 30a of the intermediate gear rest 30, so the driving force of the paper feed gear 29 is constantly transmitted to the feed roller teeth 37, and this driving force a clutch mechanism for transmitting the driving force to the feed roller 7 to feed the cut paper 6, or for canceling the transmission of the driving force to stop the feeding of the cut paper 6; This will be explained next based on FIGS. 3 and 4.

As shown in FIG. 3, the feed roller gear 37 is attached to the feed roller shaft 8 by fitting the stopper 42 into the groove 8b and then fitting the feed roller teeth 1i37 to 1ff1, and then fitting the feed roller gear 37 to the clutch friction portion 37a of the feed roller gear 37. After fitting the clutch spring 39 with the groove 40a of the spring holder 40, the spring pin 40 is fitted through the groove 40b of the spring holder 40. 41 is fitted into the hole 8a, and the lever portion 39a at the other end of the clutch spring 39 is a clutch lever rotatably mounted on the shaft 34 as shown in FIGS. 2 and 4a. 43 is engaged with the tip cam portion 43a.

0] In the state described above, when the paper feed gear 29 rotates counterclockwise as shown by the arrow in FIG. 2, the intermediate gear 31.
32. Feed via 33 []-R Both gears 7 also rotate counterclockwise as shown by the arrows, and are attached via a one-way clutch (not shown) that transmits only the rotational force in the counterclockwise direction to the feed roller shaft 8. attempts to rotate the feed roller 7 counterclockwise.

However, the lever part 39a of the clutch spring 39 engages with the tip cam part 433 of the clutch lever 43, and the clutch spring 3
Since a force is applied to the feed roller 9 in the direction of loosening the spring, the feed roller gears 7 idle between the clutch friction portion 37a and the clutch spring 39, and no driving force is transmitted to the feed roller shaft 8.

Therefore, in this state, the feed roller 7 does not rotate and the feed rollers 7 do not feed the paper cutters 1 to 6, but only feed based on the paper feed []-ra 11 and the IJF paper roller 17. will be held.

Next, the cut paper 6 is fed to the feed roller 7 by disengaging the tip cam portion 43a of the clutch lever 43 and the lever portion 39a of the clutch spring 39. It is easy to understand from the above explanation that the driving force of the paper machine 29 can be transmitted.

Various methods can be considered for disengaging the clutch lever 43 and the clutch spring 39, but the method is linked to the movement of the carriage, which can be realized at low cost with a simple 1 m structure without using any electromagnetic device or the like. The n-groove will be explained based on FIG. 4.

The carriage 22, which carries the print head 21 and moves back and forth in the axial direction while being guided by guide shafts 23 and 24, normally moves to the right of the home position shown by the solid line in Figure 4, but it is not suitable for feeding cut paper. When a feed command is issued, the carriage 22 moves to the position shown by the dotted line, which is away from the home position, and at this time, the cam portion 22a at the lower end of the screw engages with the arm portion 43b of the clutch lever 43, and the clutch lever is moved.
43 is pushed down against the spring force of the spring 44 and rotated counterclockwise.

By rotating the clutch lever 43 as described above, the engagement between the tip cam portion 43a of the clutch lever 43 and the lever portion 39a of the clutch spring 39 is released, and the feed roller teeth!
3'! The rotation in the opposite direction fft of 37 is caused by clutch spring 39
A force in the tightening direction is applied to tighten the clutch friction portion 37a of the feed roller gear 37.

Therefore, the driving force transmitted to the feed roller gear 29h'l is transmitted to the feed roller shaft 8 without causing any idling in the feed roller gear 37, and the one-way clutch transmits the counterclockwise rotational force to the shaft. The feed roller 7 attached via the cut paper 6 (not shown) rotates to feed the cut paper 6.
feeding starts.

When the cut paper 6 is fed by the feed roller 7, passes through the paper feed roller 11, and the leading edge is detected by the paper detector 16, a signal is sent and the carriage 22 returns to the home position.

As a result, the engagement between the arm portion 43b of the clutch lever 43 and the cam portion 22a of the carriage 22 is released, the clutch lever 43 is rotated clockwise by the spring force of the spring 44, and the clutch lever 43 is rotated clockwise by the spring force of the spring 44. Part 39a and clutch lever
43 engages with the tip cam portion 43a again, idling occurs between the feed roller gear 37 and the clutch spring 39, transmission of driving force from the feed gear 29 to the feed roller shaft 8 is cut off, and the feed roller 7 stops feeding the cut paper 6.

Therefore, the subsequent feeding of the cut paper 6 is performed by the paper feed roller 11, the presser roller 13, the paper ejection roller 17, and the presser [1-ra1].
This is done only by the paper feeding mechanism comprised of 9 and 9.

Also, at this time, even if a part of the cut paper 6 still remains in the hit portion and is in contact with the feed roller 7, the feed roller is moved to the cut paper 6 by the action of the one-way clutch that transmits only the rotational force in the counterclockwise direction. It spins idly as it moves and does not interfere with this feeding.

<Effects> The present invention provides a printer having the above-mentioned tapping structure and having a paper feeding mechanism that feeds not only conventional continuous paper but also cut paper stored in a cassette as printing paper in one stroke. be done.

Moreover, this paper feeding mechanism is an extremely simple and low-cost mechanism since there is no need to provide a special motor or an electromagnetic S head for feeding the paper.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the printing paper feeding path of the printer of the present invention, Fig. 2 is a diagram showing the mechanism connecting the continuous paper feeding mechanism and the cut paper feeding mechanism, and Figs. FIG. 4 is a diagram showing clutch operation 1jl 174. 6...Cut paper, 7...Feed roller, 11...
・Paper feed roller, 17... Paper discharge roller, 21... Print head, 22... Carriage, 28... Continuous paper insertion slot, 29... Paper feed gear, 37... Feed roller gear , 39...Clutch spring, 43...Clutch lever - Patent applicant Janome Sewing Machine Industry Co., Ltd. No. 3 to 7Q No. 4 (b) 2CL

Claims (1)

[Claims] 1. A first paper feeding mechanism that feeds and discharges continuous paper to and from the printing unit, and a first paper feeding mechanism that feeds cut sheets stored in a cassette one by one to the first paper feeding mechanism. 2 paper feeding mechanism, and the second paper feeding mechanism
A paper feeding device for a printer, characterized in that a paper feeding mechanism is connected to the first paper feeding mechanism via a clutch mechanism. 2. A patent claim characterized in that the clutch mechanism that connects the first paper feeding mechanism and the second paper feeding mechanism operates in conjunction with the movement of the carriage on which the print head is mounted in the axial direction relative to the support shaft. A paper feeding device for a printer according to item 1.