JPS6211665A - Printer - Google Patents

Abstract

PURPOSE:To enable a bail roller to contact with a platen under pressure and to be spaced apart therefrom corresponding to the position of a carriage at the times of the feed and delivery of paper, by providing an open lever for separating a bail roller shaft from a platen in connection with the carriage. CONSTITUTION:When paper is set to a paper feed operation state by a paper absence detector, a carriage 16 is once positioned at a home position and a current is supplied to a solenoid 18 in this state and a roller 19 is fallen to the position contacted with the cam 15f of an open lever 15. The carriage 16 moves to the center of a platen 14 and the open lever 15 is pushed by the roller 19 to be rotated to the direction shown by an arrow A around a guide shaft 14 and a shaft 10 is kept away from the platen 4 against a spring 13 through an arm 15a to separate a bail roller 11 from the platen 4. When a cut sheet 37 is drawn out from a paper feed cassette 27 and fed to the bail roller 11, the supply of a current to the solenoid 18 is cut off and the bail roller 11 presses the cut sheet 37 to the platen 4 by the spring 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printer, and more particularly to a printer that automatically feeds cut sheets.

[Prior Art] With the spread of word processors, printers have become widely used as output terminals.

In the case of word processors, cut sheets are almost always used, and since they process large amounts of paper, an automatic paper feeding function is often required.

For this reason, a format in which the automatic paper feeder is installed as an option on the top of the printer has been adopted [Problem to be solved by the invention] However, when the automatic paper feeder is installed as an option on the top of the printer, the exterior of the automatic paper feeder itself is damaged. .

This method requires a separate chassis and the like, which is not only expensive, but also has the disadvantage that the connection between the automatic paper feeder and the main body is less reliable.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a paper feed cassette that includes a carriage that reciprocates along the platen and a bail roller that presses against the platen and presses the cut sheet. In a printer that can be detachably mounted, a spring is applied between the bail roller shaft to which the bail roller is attached and the platen shaft, and as the platen rotates, the bail roller shaft and the bail roller are attached to the circumferential surface of the platen. We adopted a structure in which the bail roller shaft can be rotated along the same direction, and a release lever is provided that can move the bail roller shaft away from the platen in conjunction with the carriage.

[Function] When the structure described above is adopted, the bail roller can be pressed against and separated from the platen according to the position of the carriage during paper feeding and paper ejection, and reliable paper feeding and paper ejection can be achieved with an extremely simple structure. can be done.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

Figure 1 and the following diagrams explain one embodiment of the present invention.
The figure shows the overall structure.

In Figure 1, the symbol l is the frame of the device.
Side plates 2 and 3 are formed on the left and right sides thereof, and an inclined bent portion 1a is formed on the rear end side.

A rotary shaft 5 is rotatably supported between the left and right side plates 2 and 3, and a platen 4 made of an elastic material such as rubber is fixed to the rotary shaft 5.

A paper feed gear 6 is fixed to one end of the rotating shaft 5, and a swing arm 7 is attached to the outside thereof so as to be rotatable with respect to the rotating shaft 5.

A pendulum gear 8 is rotatably supported on one end of the swing arm 7 via a shaft 9.

Further, the other end of the swing arm 7 is bent along the rotating shaft 5 and extends in the direction of the platen 4 to form an engaging portion 7a.

Although not shown, a predetermined friction is applied between the swing arm 7 and the rotating shaft 5 by a friction pad spring.

Further, bail roller arms 9 are attached to the rotating shaft 5 on both sides of the platen 4.

The bail roller arm 9 has a long hole 9a.
A rotary shaft 5 is rotatably and slidably fitted therein.

Further, a protrusion 9b protruding from the upper end side of the bail roller arm 9 is provided to engage with a release lever to be described later.

This bail roller arm 9 does not rotate when the platen 4 rotates in the normal direction, and a stopper (not shown) prevents the platen 4 from rotating.
Rotation is prohibited even when rotating in reverse.

A projecting piece 9c is provided at the upper end of the bail roller arm 9, and a bail roller shaft 10 is inserted between these projecting pieces 9c, 9c.
is rotatably supported.

The bail roller axis lO extends parallel to the platen 4, and the bail roller 11 is fixed in the middle thereof.

The bail roller 11 is made of a material having a large friction coefficient, such as rubber.

A U-shaped spring hook 12 is fitted inside the protruding piece 9c, and a spring 13 is hooked between both ends of the spring hook 12 and the rotating shaft 5, and the tension of the spring hook 12 causes the pedal to rotate. - The roller 11 is always pressed against the platen 4.

On the front side of the platen 4, the guide shaft 1 is parallel to this.
4 is suspended horizontally between the side plates 2 and 3.

Near both ends of the guide shaft 14, the middle portions of the left and right arms 15a of the release lever 15 are rotatably supported at positions corresponding to the bail roller arms 9.

The protrusion 9 of the bail roller arm 9 is attached to the tip of the arm 15a.
A hook 15b that engages with the hook 15b is provided in a protruding manner.

Furthermore, at one end of the release lever 15, below the arm 15a, another arm 15c extends toward the platen 4, and a hook 15d formed at the tip of the arm 15c engages the swinging arm 7. It is engaged with the portion 7a.

Further, a cam 15f is formed over a predetermined length on the front side edge of the release lever 15 at a position closer to the arm 15c.

Further, a guide shaft 17 is horizontally suspended between the front end portions of the left and right side plates 2 and 3 of the frame l in a state parallel to the guide shaft 14. That is, a solenoid 18 is attached to the side edge of the arm 15c, and a roller 19 is rotatably supported at the lower end of a rod 18a that projects downward.

Further, a ribbon mask 20 is provided to protrude upward from the end of the carriage 16 on the platen 4 side, and also serves as a paper presser.

A recording head 21 is provided at a predetermined position on the upper surface of the carriage 16, and an ink ribbon cassette 22 is detachably attached to the upper side of the carriage 16 so as to surround the recording head 21. A timing pulley 23 is rotatably supported at a position cut out in the left side plate 2 at the front end of the frame 1.

A timing belt 24 is stretched endlessly between the timing pulley 23 and a driving pulley (not shown) attached to a motor (stepping motor) 25 attached to the outside of the side plate 3.

The gear ridge 16 is located in the middle of this timing belt 24.
is fixed.

A paper discharge tray 27 is arranged on the back side of the platen 4, and a paper feed cassette 28 is removably attached to the bent portion la below the paper discharge tray 27.

A paper feed roller shaft 29 is rotatably supported at the lower end of the paper feed cassette 28 across the paper feed cassette 28, and a paper feed gear 30 is mounted on one end of the shaft at a position where it can mesh with the pendulum gear 8. Fixed.

On the other hand, a paper feed motor 26 is fixed to the outside of the right side plate 3, and rotates the platen 4 at an arbitrary angle by a transmission mechanism (not shown).

By the way, as shown in FIG. 2, a paper pan 31 curved in an arc shape over its entire length is disposed close to the platen 4 on the lower side thereof.

A pinch roller 32 passes through an opening formed in a portion of the vapor pan 31 and is pressed against the platen 4 via a spring (not shown).

On the other hand, as shown in FIG. 2, the paper feed cassette 28 is provided with a paper feed roller 33 fixed to the paper feed roller shaft 29, and is in contact with the lower surface of the cut sheet 37.

A paper presser plate spring 35 is arranged above the stacked cut sheets 37, and a paper presser pad 34 for pressing the cut sheets 37 is fixed to the free end side of the leaf spring 35.

Furthermore, a claw 36 is provided at the lower end of the paper feed cassette 28 for separating the cut sheets 37 one by one during feeding.

One claw 36 is provided near both ends of the paper feed cassette 28 in the width direction.

Next, the operation of this embodiment configured as above will be explained.

First, when a paper out condition is detected by a paper out detector (not shown), or a feed key provided on an operation panel (not shown) is pressed, or a predetermined paper feed is performed by a control code from a control device. When you receive an order,
The device enters the paper feeding operation state.

Then, when the motor 25 first rotates a predetermined amount and the carriage 16 is located at the home position, which is the left end of the platen 4, the solenoid 18 is energized and the rod 1
8a is lowered, and the roller 19 is moved to the cam 15 of the release lever 15.
It descends to the position where it touches f.

In this state, when the carriage 16 moves to a position corresponding to the center of the platen 4, the release lever 15 is pushed by the roller 19, and the release lever 15 rotates about the guide shaft 14 in the direction of arrow A in FIG. As shown in FIG. 3(A), the shaft 10 is moved away from the platen 4 via the arm 15a. As a result, the bail roller 11 also separates from the platen 4.

At this time, the bail roller arm 9 moves so as to be pulled up within the range of the elongated hole 9a, and the hook 15d separates from the engaging portion 7a of the swing arm 7.

At this time, the spring 13 is stretched.

When the platen 4 is rotated in the reverse direction in this state, the swing lever 7 is rotated clockwise in FIG. Since the pendulum gear 8 is always in mesh with the paper feed gear 6, the paper feed gear 30 is rotated in the direction of arrow B in FIG.

As a result, the paper feed roller 33 is rotated in the direction of arrow B.

Then, the cut sheet 37 in contact with the paper feed roller 33
One sheet of paper is sent to the platen side and forms a predetermined loop at the contact portion between the platen 4 and the pinch roller 34 as shown in FIG. 3(A).

Next, when the platen 4 is rotated in the normal direction, the swing lever 7 returns to its original state and the pendulum gear 8 is separated from the paper feed gear 30 and only the platen 4 rotates in the normal direction. It can be sent to a position where it can be held down.

This state is shown in FIG. 3(B).

In this state, turn off the power to the solenoid 18, and
When the roller 19 and the cam 15f are disengaged by raising the cam 15f, the spring 13 attracts the shaft lO, so the bail roller 11 comes into contact with the platen 4 and presses the cut sheet 37 against the platen 4.

In this state, the arm 15a is also rotated to its original state via the shaft 10, so that the engaging portion 7a is locked by the hook 15d.

Note that at this time, the paper feed roller 33 of the paper feed cassette 28 is also free, and only rotates following the cut sheet 37 fed by the platen 4 and the pinch roller 34, so the paper feed roller 33 is free. A one-way clutch is not required for this purpose.

In this way, the cut sheet is set in the recording position,
Recording is performed according to the recording command.

When the recording of one page is completed, the carriage 16 returns to the home position, the solenoid 18 is energized, and the roller 19 is lowered and engaged with the cam 15c.

When the carriage 16 is moved slightly to the right, the roller 19 slightly climbs the slope of the cam 15f, so the release lever 15 is slightly rotated in the direction shown by arrow A in FIG. It separates from the protrusion 9b of the roller arm 9.

This state is the state shown in FIG. 4(A).

At this time, the hook 15d is engaged with the engaging portion 7a, and the bail roller 11 is in contact with the platen 4.

When the platen 4 is rotated in the normal direction in this state, since the spring 13 is stretched between the shafts 10 and 5, the bail roller arm 9 is rotated in synchronization with the platen 4 due to the frictional force, and the bail roller arm 9 is rotated in synchronization with the platen 4. 11 rotates around the circumferential surface of the platen 4 and moves together with the bail roller arm 9, as shown in FIG.
), the bail roller 11 comes into contact with the paper discharge tray 27.

If the sheet is rotated further in the normal direction in this state, the cut sheet 37 sandwiched between the bail roller 11 and the sheet discharge tray 27 is stored in the sheet discharge tray 27.

After the cut sheet 37 is stored in the paper output tray 27,
Stop the rotation of the platen 4, then reverse the platen 4 and move the bale roller arm 9. The bail roller 11 is returned to the normal position to complete the paper ejection process.

Note that at this time, the swing arm 7 moves its engaging portion 7a to the fourth position.
As shown in Figure (A), since the release lever 15 is locked by the hook 15d, the sheet feeding operation due to the reverse rotation of the platen 4 does not occur.

If it is desired to continue the paper feeding operation, the carriage 16 may be moved to the center of the platen 4 and the paper feeding operation may be performed as described above.

By the way, timing charts during the above-mentioned sheet feeding and sheet ejecting operations are shown in FIGS. 5(A) and 5(CB).

FIG. 5(A) explains the operation timing of each member in the case of paper feeding operation, FIG. 5(CB) explains the operation timing of each member in the case of paper ejecting operation, and FIG. 5(B) shows the operation indicated by the symbol a. When the paper bail arm 9 returns after completing the paper ejection operation, the protrusion 9b
The release lever 15(7)I@15ac7) is shown pushing the tip hook 15b and rotating slightly.

Furthermore, during the paper ejection operation, the carriage 16 may continue to move slightly to the right away from the home position, and the solenoid 18 may be activated during this operation.

This motion is shown by the broken line in FIG. 5(B).

In this case, the release lever does not operate as indicated by the symbol a in FIG. 5(B). That is, the bail roller shaft 1
This is because the arm 15a remains in a position away from the protrusion 9b until the zero returns completely.

[Effect] As is clear from the above description, according to the present invention, a spring is wound between the bale roller shaft having the bale roller arranged parallel to the platen and the platen shaft, and the bale is rolled as the platen rotates. The roller shaft is rotatable along the circumferential surface of the platen via the bail roller, and a paper discharge tray is provided at the rear upper part of the platen in contact with the bail roller, and the bail roller shaft is rotated in conjunction with the carriage. The structure is equipped with a release lever that allows the paper to come into contact with the platen, making it possible to feed and eject paper with an extremely simple structure. The reliability of the paper mechanism can be greatly improved.

[Brief explanation of the drawing]

The figures are for explaining one embodiment of the present invention, and Fig. 1 is a perspective view of the printer, Fig. 2 is a longitudinal cross-sectional side view of the main part, and Fig. 3 (A).
, (B) are explanatory diagrams of paper feeding operation, Figures 4 (A) and (B) are explanatory diagrams of paper ejection operation, and Figures 5 (A) and (B) are illustrations of paper feeding operation and paper ejection operation. It is a timing chart figure. l... Frame 4... Platen 5... Platen shaft 6.30... Paper feed gear 7... Swing lever 8... Pendulum gear 9... Bale roller arm 10... Bale Roller shaft 11... Bale roller 13... Spring 14.17... Guide shaft 1
5...Release lever 15a, 15c...Arm 15b
, 15d... hook

Claims (1)

[Scope of Claims] 1) The bail roller is installed in a printer that includes a carriage that reciprocates along the platen and a bail roller that presses against the platen and presses the cut sheet, and to which a paper feed cassette can be detachably attached. A spring is applied between the bale roller shaft and the platen shaft, so that the bale roller shaft can rotate together with the bale roller along the circumferential surface of the platen as the platen rotates. A printer characterized by being provided with a release lever that can separate a roller shaft from a platen. 2) The printer according to claim 1, further comprising a paper discharge tray provided at the rear upper part of the platen so as to be in contact with the bail roller. 3) A pendulum gear is provided at one end of the swinging lever that is fitted to the platen shaft with a predetermined frictional force, which engages with the paper feed gear on the paper feed cassette side and transmits the rotational force in the paper feed direction from the platen; 3. The printer according to claim 1, wherein the other end of the swing lever is provided with an engaging portion that engages with one end of the release lever.