JPS61148079A - Auto-loading mechanism for printer - Google Patents

Abstract

PURPOSE:To enable a recording paper to be automatically drawn in and enhance operability, by a method wherein a knob connected with a platen shaft support is rotated to separate a bail roller from a platen, and simultaneously, a switch for a motor for feeding a recording paper is turned ON. CONSTITUTION:When a lever 11 is located at a retracted position and a support arm 17 is displaced by oscillation to the side opposite to a roller support 18, a recording paper P is supplied to an upper surface of a pinch roller 2, and when the knob 5 is rotated counterclockwise and the lever 11 is oscillated to a front position, a support shaft 10 is driven to rotate. The arm 17 is displaced by oscillation, the roller support 18 is pushed up rightward, and the pinch roller 2 grips the leading end of the paper P. Then, the switch 14 is turned ON, and the paper P is fed to a predetermined position. With the knob 5 rotated clockwise, the lever 11 is returned to the retracted position, the bail roller 8a presses the paper against the platen 1, and the pinch roller 2 presses the paper against the platen 1 with a weak pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application) The present invention relates to an autoloading mechanism for a printer.

(Prior Art) Conventionally, large printers such as word processors are equipped with an autoloading mechanism, in which the paper presser roller is separated from the platen using an operating lever that protrudes from the outside, and then a push button is pressed. Instead, the paper feed motor was started and the paper was automatically drawn in.

(Problems to be Solved by the Invention) The autoloading mechanism in this prior art requires operation using a control lever and pressing operation of a push button, making the operation complicated. The force with which the pinch roller makes elastic contact with the platen is always the same strong force, so even if the leading edge of the recording paper is in contact with the pinch roller, it is difficult for the paper to be caught between the platen and the pinch roller. When conveying recording paper with a bin tractor or the like, a separate mechanism is required to move the pinch roller away from the platen against a spring, resulting in a multi-sheet configuration. The purpose is to enable automatic retraction. To make it possible to surely sandwich recording paper between a friend platen and a pinch roller, and to apply appropriate tension to the recording paper even during tractor feeding.

(Determined means for solving the problem of intermittent problems) In the present invention, a knob 5 is connected to one end of the platen bearing 3, and a crank part 3at is provided at the end in addition to the platen bearing 3. The paper pressing plate 6 is swung through a link machine 411 that is repeatedly depleted. The paper press plate 6 supports a shaft 8 of a paper press roller 8a. Further, a lever 11 is provided so as to be able to follow the swinging motion of the paper presser plate 6, and a switch 14 of the feed motor is turned on and off by means of a T-switch pressing piece 11b provided integrally with this lever.

Furthermore, the entire lever 11 is fixed to the end of the support shaft 10, and the support shaft 10 can be rotated nine times by swinging the lever.A support arm 17 is connected to the support glaze, and the tip of the support arm A roller receiver 18 is connected to the roller receiver 18, and a narrow pinch roller 2t for supplying friction to the recording paper is mounted on the other end of the roller receiver. Support arm 17 and roller receiver 1
A biasing spring 19 is stretched between the support arm 1 and the support arm 1.
7 is oscillated to the opposite side of the roller receiver 18, and in the next retracted position, it becomes close to the line of action of the spring force of the urging spring 19, and this position becomes a fulcrum, and in the forward position of the support arm 17, the line of action of the spring force acts as a fulcrum. The support arm 17 and the roller receiver 18, which are far apart from each other, are connected to each other as a fulcrum.

(Function) By only rotating the knob 5 in this manner, the paper presser roller 13at is separated from the platen 1, and at the same time,
The swing of the lever 11 can be used to turn on and off the feed motor. Further, by the swinging of the lever 11, the support arm 17 is moved forward and backward, the fulcrum of the roller receiver 18 by the support arm 17 is switched, and the rotational moment at each fulcrum t is changed to move the pinch roller 2 toward the platen 1. The suppressing force is changed.That is, when the support arm 17 is in the retreated position, the pinch roller 2 comes into elastic contact with a weak pressing force, and when the support arm 17 is in the forward position, the pinch roller 2 comes into elastic contact with a strong pressing force.

(Example) In the first to fifth drawings, 1 is a platen that is rotationally driven during paper feeding, 2 is a pinch roller that makes elastic contact with the platen 1, and the recording paper P is placed between the platen 1 and the pinch roller 2 when set. supplied to The shaft 1a of the platen 1 passes through a platen bearing 3 and is rotatable, and the platen bearing 3 is rotatably supported by a frame 4 of the printer. The platen bearing 3 has a K knob 5 fixed to one end (lower end in FIG. 3), and three crank parts are provided at the other end. A connecting pin 3b is integrally provided at the tip of the crank portion 5a. Reference numeral 6 denotes a paper press plate, and one end thereof is pivotally connected to a shaft 7, which is a support for the frame 4. The other end of the paper press plate 6 supports a shaft 8 to which a paper press roller 8a, which applies friction when feeding the recording paper P by friction feed, is rotatably attached. A connecting pin 6a is integrally provided in the middle of the paper pressing plate 6, and a link 9 is rotatably connected between it and the connecting pin 5b of the AP1 crank portion 3a. Reference numeral 10 denotes a support shaft, which is located parallel to the platen 1 and is rotatably supported by the frame 4. One end of a lever 11 is fixed to the end of the support shaft 10, so that the lever 11 is pivotably pivoted at its one end.

A protrusion 11'a is integrally provided at the other end of the lever 11. A guide groove 6b is provided in the paper holding plate 6 to remove dust.
The protrusion 11a is movably engaged in the guide groove 6b.

As a result, the lever 11 can freely follow the swinging movement of the paper press plate 6 by moving the projection 11 & from one end of the guide 1 to the other end.

One end of the paper/pressing plate 6 is integrally fitted with a spring hook 6C, which serves the frame 4, and a switching spring (ohmic spring) 13 is hooked to the lock between the spring hook 12 and the spring hook 12. Lever 1
A switch pressing piece 11b is integrally provided in the − and A portions of 1, and when the lever 11 is driven, the switch pressing piece 11b moves forward, and in the next position, the switch of the paper feed motor (not shown) is activated. 1
4 is turned on. Reference numeral 15 denotes an opposite type sensor, which detects an excess of the tip '1 of the recording paper P and stops the motor at a predetermined time. A shaft turning knob 16 (shown in the third figure) is fixed to the tip of the shaft 1a of the platen 1.

When feeding the paper, the recording paper P is moved between the platen 1 and the pinch roller 2.
When the knob 5 is turned counterclockwise after being supplied between the
The platen bearing 5 rotates counterclockwise, and the crank part 5
A moves for -8 nights in the opposite direction, and the paper press plate 6 is moved through the link 9? 41 From the position shown in the diagram; @22 The signal is disseminated to the position t# shown in the diagram. As a result, the paper pressing roller 8a is separated from the platen 1. The paper pressing plate 6 is reliably switched by a switching spring 13.

There is a protrusion 11a in the guide groove 6b due to the rocking of the paper presser plate 6.
moves and reaches the other end of the guide groove, and the lever 11 is moved to the second end.
・Swing to the A position/Ba position. This ((The machined switch push-up piece 11b advances to the right and reaches the t position, and the switch 14
Turn on. When the switch 14 is turned on, the paper feed motor starts and the recording paper P is pulled in.The leading edge of the recording paper P passes in front of the 5-opposite sensor 15, and after a predetermined time, the motor stops and the recording paper P is pulled in. is set in place.

Then, by turning the knob 5 clockwise, the lever 11 returns to the proper position shown in the figure, and the paper presser row 8a presses the recording paper Pt-platen 1. In this practical example, the lever 11 is placed at the end of the support @10. Since the lever 11 swings from $ 1 +g to the position shown in the second figure, the support shaft 10 rotates l.
@Moved. That is, as shown in jlc5.4, the support arm 17 is attached to the support shaft 1GK. The support arm 17 extends integrally inward from the boss portion 17a that supplies the support shaft 10, and has a chain @@17c integrally provided at the tip portion 17b.

A protrusion 117d is provided on a part of the boss portion 17a.

A spring hook 17s is integrally formed on the support arm 17, and this spring hook is provided at a position closer to the platen 1 by a slight distance than the protrusion 17d. Support arm 1
7 is connected to a cola receiver 18. That is, a connecting groove 18a is provided at one end of the roller receiver 18, which engages with the connecting shaft 17c and is rotatable and movable. The other end of the roller receiver 18 is a roller bearing portion 18b, which rotatably supports the pinch roller 2 which is in elastic contact with the platen 1. Vertical bending pieces 18c are provided on both sides of the roller receiver 18.
, 18c are provided, and protrusion receivers 18d, 18d recessed so as to engage with the protrusion 17d are formed. A spring hook 18e is provided on the roller receiver 18, and a biasing spring 19 is stretched between it and the spring hook 17a of the support arm 17.

The support arm 17 is oscillated in the opposite direction to the roller receiver 18 in conjunction with the rotation of the support sleeve 10, and is pivoted from the retracted position (solid line position in Figure 4) to the forward direction of the roller receiver 18. It swings by an angular range up to position f (4th closed, my position).

When the support arm 17 is in the retracted position, the roller receiver 1
8Fi The protrusion receiver 18d is the protrusion 17dK biasing spring 19
This engagement position is the fulcrum O1 (fifth
2, this fulcrum 01 is the line of action of the force of the biasing spring 19, that is, the spring hook 17e to 18
It is located at a position that is slightly bent toward the connecting means consisting of the connecting shaft 17C and the series of connecting grooves 18a from the line connecting e. If the distance from the fulcrum 01 to the line of action of the spring force is m'cLo, and the spring force of the biasing spring 19 is FQ, then the oral moment ν due to the biasing spring at the fulcrum O1 is Foto. Fulcrum 0
1 to the point of contact between the platen 1 and the pinch roller 2 is tl, and the reaction force of the pinch roller's elastic contact with the platen is tFt, then the rotational moment due to the reaction force F1 at the fulcrum o1 is Fl zl, and the above Balanced with the moment Foto, the force O is extremely large, so -Shiichi is an extremely small value.

However, Ftfi has extremely small power. That is, when the support arm 17 is in the retracted position r, the pinch roller 2 is in elastic contact with the plate/1 with a weak pressing force.

When the support arm 17 is in the forward position, the roller receiver 1
8 is pushed forward by the support arm 17 via its connecting portion, and as a result, the protrusion 17d and the protrusion receiver 113d are separated from each other. Connecting shaft 17c and connecting groove 18a
The scoring means is held as a fulcrum 02 (8g4 shown). The fulcrum 02 is far away from the action line of the spring force, the distance from the fulcrum 02 to the line of action of the spring force is t3, the distance to the contact point between the platen 1 and the pinch roller 2 is t2, and the pinch roller If the reaction force t F z at the fulcrum 02 is the rotational moment F, 12 due to the reaction force F2 at the fulcrum 02 and the spring force FoK, then 2
This is an extremely large force compared to 1. That is, in the forward position of the support arm 17, the pinch roller
It is in elastic contact with a strong pressing force.

The protrusion 17 (l and the protrusion receiver 18d: are opposite to the illustration)
A protrusion may be provided on the roller receiver, and a protrusion receiver may be provided on the support lever. The connector #iU17c and the connector 418a may also be formed oppositely in the same manner as described above.

When the lever 11 is in the retracted position (FIG. 1 position 1) and the support arm 17 is in the retracted position shown in FIG. When the recording paper P is fed to the upper surface of the pinch roller 2, the knob 5 is turned counterclockwise, and the lever 11 is swung to the forward position shown in FIG. Ru. Due to the rotation of this support @10, it is oscillated in the direction of the support arm 17 and narrow roller receiver 18, and reaches the forward movement position.
The roller receiver 18 is pushed upward and to the right as shown by the chain line in Figure 41, and the pinch roller 2 firmly holds the front end of the recording paper P and pinches it with a strong pressing force.

Then, as described above, the switch 14 is turned on, the motor is started, and the recording paper P is fed to a predetermined fill level.

When the knob 5 is turned clockwise, the lever 11 returns to the retracted position (FIG. 1 position), the paper pressing roller 8a presses the recording paper against the platen 1, and the support arm 17 also moves to the retracted position.
Returning to the solid line position in FIG. 4, the pinch roller 2 presses the recording paper against the platen 1 with a weak pressing force. If printing is performed in this state, the recording paper will have an appropriate tension of 〃1 or υ, and clear printing will be possible.

(Effects of the Invention) The present invention makes it possible to move the paper presser roller away from the platen and at the same time turn on the switch for feeding the recording paper, simply by turning the knob connected to the platen bearing.
The automatic retraction of the recording paper is simple, and the structure is simple and the operability is good.

Furthermore, simply by turning the above-mentioned knob, the recording paper can be reliably sandwiched between the platen and the pinch roller, and automatic retraction can be ensured. Even when printing in bulk, it is possible to apply appropriate tension to the recording paper simply by turning the knob, resulting in beautiful printing.

[Brief explanation of the drawing]

Figures 1 and 2 are sectional views taken along the line 1-1 in Figure 3 to explain the operation; Figure 31 is a plan view; FIG. 6 is a regular route map explaining the operation. 1...Platen 2...Pinch roller 5...
・Platen bearing 3a...Crank part 5...Knob 6...Paper presser plate 8...Shaft
8a...Paper presser roller 9...Link 1
0... Support shaft 11... Lever 11b...
Switch pressing piece 13...Switching spring 14...Switch 17..., Support arm Ilc...Connection shaft 1
7d... Protrusion 18... Roller receiver 18a.
...Connection #18d...Protrusion receiver 19...More than biasing spring Performer Seikokai Co., Ltd. 11k) Figure 2 13 Ill) 171) 17C18a

Claims (2)

[Claims] (1) A platen that is rotationally driven when paper is fed, a pinch roller that comes into elastic contact with the platen, a knob connected to one end, and a crank part provided to the other end so that the platen can rotate freely through the platen. a platen bearing supported on the platen, a paper presser plate pivotally mounted at one end and supporting the shaft of the paper presser roller at the other end, the crank section and the paper presser plate. a link that is rotatably connected; a lever that is pivotably connected at one end and that is connected at the other end so that it can follow the swing of the paper press plate; and the paper press plate and the lever. An autoloading mechanism for a printer comprising a switching spring latched between the lever, a switch pressing piece provided on the lever, and a paper feed motor switch that is turned on and off by the switch pressing piece. (2) A platen that is rotationally driven when paper is fed, a pinch roller that comes into elastic contact with the platen, a knob connected to one end, and a crank part provided at the other end so that the platen can rotate freely through the platen. a platen bearing supported on the platen bearing, a paper holding plate pivotally attached at one end so as to be swingable and supporting the shaft of the paper holding roller at the other end, the crank section and the paper holding plate. One end of the link is fixed to a support shaft that is rotatably supported and located parallel to the platen, and the other end is able to follow the swinging of the paper press plate. a lever connected to the lever, a switching spring hooked between the paper press plate and the lever, a switch pressing piece provided on the lever, and a paper feed switch that is turned on and off by the switch pressing piece. A motor switch, a support arm that is attached to the support shaft and is oscillated by the rotation of the support shaft, a roller receiver that supports the pinch roller at one end, and the tip of the support arm and the roller. A connecting means for rotatably and movably connecting the other end of the receiver, a biasing spring tensioned between the support arm and the roller receiver, and a line of action of the force of the biasing spring. a protrusion protrudingly formed on one of the support arm and the roller receiver at a position slightly apart from the connecting means side, and a protrusion receiver provided on the other, the lever being moved by rotation of the knob; The switch press piece is moved forward and backward by swinging to turn the switch on and off, and at the same time, the support shaft is rotated to move the support arm forward and backward, and when the support arm is in the retracted position, the roller is turned on and off. The receiver receives a rotational moment from the biasing spring using the engaging portion between the protrusion and the protrusion receiver as a fulcrum, and in the forward position, the roller receiver is pushed forward in conjunction with the displacement of the support arm. Accordingly, the autoloading mechanism for a printer is characterized in that the roller receiver receives a rotational moment from the biasing spring using the connecting means as a fulcrum.