JP3440961B2 - Printer paper feeder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an optimum feeding action for continuous paper such as fanfold paper and cut paper such as cut paper. The present invention relates to a paper feeder for a printer configured to be capable of performing the above operations. 2. Description of the Related Art Some printers as output devices of computers are capable of using continuous paper such as fanfold paper and cut paper such as cut paper.
A feeding force is applied to fanfold paper by a push tractor disposed in front of the platen, and to a cut paper by rotation of the platen itself. For this reason, the paper feed of this type of printer is
It is necessary to change the feeding to the platen or the paper feed roller depending on whether the paper is continuous paper or cut paper. For this reason, the apparatus presented by the present applicant in Japanese Patent Application Laid-Open No. 2-70468 is a paper displaced by an operation lever. The roller holder is operated via the feed lever, and the rollers attached to the front and rear of the roller are separated from the platen and the paper feed roller in order from the upper roller. And a plurality of springs for biasing the same, leaving room for further simplification of the structure. [0004] The present invention has been made in view of such a problem.
It is an object of the present invention to provide a paper feeder for a printer which has a simple structure and can be operated reliably, in which the pressing force to be applied can be changed depending on whether it is continuous paper or cut sheet paper. [0005] That is, the present invention is a paper feeder for a printer for achieving the above object, and has a recording paper pressing portion at one end, and a force point at which the other end receives an urging force.
The paper holding lever member configured as a part, the longitudinal direction
Fulcrum of the fulcrum for the single-cut sheet in the central portion, provided with a fulcrum for the continuous paper to the side of the force input portion, to face the fulcrum portion <br/> for the continuous paper for the continuous paper above when the parts and in contact with
The fulcrum for serial single-cut sheet is separated from the opposing member, also movable fulcrum to abut on the opposing member fulcrum for the single-cut sheet paper when separated from the fulcrum for the <br/> continuous paper the is obtained so as to dispose. An embodiment shown in the drawings will be described below. The drawings each show an embodiment of the present invention incorporated in a printer main body. In FIG. 1, reference numeral 1 denotes a roller lever which is displaced so as to change the pressing force to the paper feed roller 23 depending on whether the sheet is continuous paper S1 or cut sheet S2.
At the center of the upper surface, a cut-sheet paper fulcrum 2 having a triangular cross section, which is in contact with a part of the fixed frame 9 and forms one rotation fulcrum, is formed in a protruding manner. The fulcrum receiver 3 for continuous paper which is in contact with the movable fulcrum 7 and forms the other rotation fulcrum is formed. When the roller lever 1 presses the continuous paper S1, as shown in FIG. 1, the tension F of the spring 6 acting on the power point 4 is set with the corner of the movable fulcrum 7 having a D-shaped cross section as the fulcrum. To the paper pressing roller 5 at the other end to apply the small pressing force P1 to the continuous paper S1.
2, the movable fulcrum 7 having a D-shaped cross section is displaced laterally as shown in FIG.
Is brought into contact with a part of the fixed frame 9, and the pressing force P2 of the paper pressing roller 5 larger than that of the continuous paper S1 is applied to the cut sheet S.
2 to act on. Therefore, the roller lever 1 has a diameter of the movable D-shaped fulcrum r and a fulcrum 2 for the cut sheet so that the pressing force P against the recording paper S can be changed by changing the position of the fulcrum. When the gap between the frame and the fixed frame 9 is δ, δ <１ ／ r. In this embodiment, the distance L1 from the fulcrum support 3 to the force point portion 4 is set such that the pressing forces P1, P2 on the continuous paper S1 and the cut sheet S2 have a ratio of 1:10.
And the ratio L1 / L2 of the distance L2 from the fulcrum support 3 to the paper press roller 5, the distance L3 from the cut paper fulcrum 2 to the force point 4, and the cut paper fulcrum 2 to the paper press roller 5. And the ratio L3 / L4 with respect to the distance L4 is set such that L1 / L2: L3 / L4 = 1: 10. FIG. 3 shows a switching unit 10 for switching the feed of the continuous paper S1 and the cut sheet S2. A switching lever 11, which is a part of the unit 10, is provided with a shaft of a paper feed roller 23. As shown in FIG. 2A, the switching lever 11 is turned counterclockwise by an operation arm 12 which is rotatably mounted on the printer body 18 and protrudes outward from a casing of the printer main body through a slit (not shown). When rotated, the movable fulcrum 7 having a D-shaped cross section is vertically displaced via the connecting lever 8 connected to the other arm 13 and at the same time, the paper feed roller gear 16 and the intermediate gear 17 are displaced.
To transmit the driving force to the push tractor 18,
When the switching lever 11 is rotated clockwise as shown in FIG. 4B, the other arm 13 displaces the movable fulcrum 7 having a D-shaped cross section via the connecting lever 8 in the lateral direction. At the same time, the intermediate gear 17 is displaced in the vertical direction on the paper surface by a cam (not shown) to
6 is disengaged. In FIG. 1, reference numeral 19 denotes a sensor for detecting the movement of the switching lever 11 to determine whether the paper is fed by a cut sheet or a continuous paper, 20 denotes a recording head, and 22 denotes a discharge roller pair. In the apparatus constructed as described above, it is now necessary to perform recording and writing on the continuous paper S1 as shown in FIG.
When the switching lever 11 is rotated counterclockwise in the figure as shown in FIG. 1, the movable fulcrum 7 having a D-shaped cross section is vertically displaced via the connecting arm 8, and as shown in FIG. The fulcrum receiver 3 is pushed down at the corner to separate the cut sheet fulcrum 2 from the fixed frame 9. For this reason, the roller lever 1 applies a weak pressing force P1 such as P1 = L1 / L2 · F to the paper pressing roller 5 with the movable fulcrum 7 as a fulcrum, and keeps the paper transport speed by the push tractor 18 continuously. The paper S1 is fed to the recording head 20 along the peripheral surface of the paper feed roller 17. On the other hand, when the switching lever 11 is rotated clockwise as shown in FIG. 3 (b) in order to perform recording and writing on the cut sheet S2, the intermediate gear 17 is moved by a cam (not shown). The arm 13 moves the fulcrum 7 having a D-shaped cross section upward through the connecting arm 8 so that the chord becomes horizontal. As shown in FIG. 1, the roller lever 1 applies a large pressing force P2 = L3 / L4.F to the paper pressing roller 5 using the cut sheet fulcrum 2 as a fulcrum. The slip sheet S2 is pressed against the paper feed roller 17, and the cut sheet S2 is conveyed at this feed speed and required recording and writing is performed thereon. In the above-mentioned embodiment, the position of the fulcrum can be changed between the fulcrum support 3 and the cut sheet fulcrum 2 by moving the movable fulcrum 7 toward and away from the fulcrum receiver 3 near the force point portion 4. However, it is also possible to provide a fulcrum for the continuous paper in the vicinity of the point of force 4 and make the fulcrum on the fulcrum 2 side of the cut sheet paper movable, thereby changing the position of the fulcrum. As described above, according to the present invention, the fulcrum located in the longitudinal direction of the paper holding lever member is cut off.
To replace the paper, use a small force when feeding
The required pressing force can be applied even when
Sometimes they can be reliably separated .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of an apparatus according to an embodiment of the present invention, shown in a paper feed state for continuous paper. FIG. 2 is a side view of the same device shown in a cut-sheet paper feeding state. FIGS. 3A and 3B are side views of the switching unit in a state in which continuous paper and cut sheet are fed. [Description of Signs] 1 roller lever 2 fulcrum for cut sheet 3 fulcrum receiver for continuous paper 4 fulcrum part 5 paper press roller 6 spring 7 movable fulcrum 9 with D-shaped cross section 9 fixed frame 10 switching unit 11 switching lever 12 operating arm 16 paper feed Roller gear 17 Intermediate gear 18 Push tractor 23 Paper feed roller

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshikazu Odaka 3-5-5 Yamato, Suwa-shi, Nagano Seiko Epson Corporation (72) Inventor Takuya Yasue 3-3-5 Yamato, Suwa-shi, Suwa, Nagano Say (56) References JP-A-3-140273 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41J 11 / 02,13 / 00,13 / 02

Claims (1)

(1) A paper holding lever member having one end as a recording paper pressing portion and the other end as a force point portion on which an urging force is applied, and a cut sheet at a central portion in a longitudinal direction thereof. A fulcrum part for paper is provided with a fulcrum part for continuous paper on the side of the force point part, and when the fulcrum part for continuous paper is abutted against the fulcrum part for continuous paper, the cut sheet is formed. A movable fulcrum for separating the fulcrum for the paper from the opposing member and for bringing the fulcrum for the cut sheet into contact with the opposing member when the fulcrum for the continuous paper is separated from the fulcrum for the continuous paper is provided. The paper feed mechanism of the printer.