JPS61225082A - Paper feed apparatus - Google Patents

Abstract

PURPOSE:To make it possible to always stop cut paper at the same position with respect to a platen without requiring an exclusive power source, by mounting a paper feed roller for feeding recording paper to the platen by the rotation of the platen. CONSTITUTION:A paper feed roller 65 is rotated in a predetermined amount to draw out the cut paper 6-1 of the uppermost part received in a paper feed cassette and sends out the same to the nip between the platen 1 and a pinch roller 55a so as to form a predetermined loop. The platen 1, to which the cut paper is impinged, is rotated to a D-direction to form a proper loop. After this reverse rotation, the positive rotation of the platen 1 is performed in predetermined quantity in such a state that a carrier 29 is stopped at the center and the carrier 29 enters return operation. When the platen 1 is forwardly rotated, a rocking plate 5 is stopped in a state contacted with a stopper pin 11 and, when a cam plate 47 is returned with the return of the carrier 29, a lock lever 10 is engaged with the rocking plate 5 to fix said rocking plate 5 at a constant position.

Description

TECHNICAL FIELD The present invention relates to a paper feeding device that is removably attached to a recording device and automatically feeds paper to a platen of the recording device.

(Conventional example) A conventional paper feeding device has a dedicated motor to rotate a paper feeding roller, and this motor is rotated when feeding paper. Also, the cut paper fed from the paper feeder is fed so that its leading edge is sandwiched between the platen and the pinch roller.
At this time, there was a drawback that the end stop positions were inevitably uneven.

(Purpose) The present invention is intended to eliminate the above-mentioned drawbacks, and aims to eliminate the need for a dedicated power source for paper feeding and to ensure that the tip position of the fed cut paper is uniform. do.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show the mechanical configuration of an embodiment of the present invention,
A platen 1 is formed in a cylindrical shape and is fixed to a platen shaft 2. The platen shaft 2 is rotatably supported between side plates (not shown), and a paper feed motor 3 is coupled to one end.

A platen gear 4 is fixed to the platen shaft 2.

Reference numeral 5 denotes an L-shaped rocking plate, which is rotatably supported on the platen shaft 2 with moderate friction, and one arm has an A% idle gear 6 which meshes with the platen gear 4 through a shaft 8.9. , and the idle gears B to Idle gear 7 which mesh with the A idle gear 6 are rotatably supported. Also, the other arm portion 5a of the diaphragm 5
is engaged with a hook portion 10a of a lock lever 10 in order to restrict the rotation of the swing plate 5 in the counterclockwise direction (anti-A direction), and a side plate (not shown) is engaged on the opposite surface of the arm portion 5a. Since the protruding stopper bin 11 is in contact with it, the swing plate 5 normally does not rotate even if the platen shaft 2 rotates in either direction (direction A) or reverse (direction of shakuhachi).

The lock lever 10 is rotatably supported by a lock lever shaft 12, and is biased by a lock lever spring 13 in a direction into which it engages with the swing plate 5. 14.15 is a tractor lever, which is rotatably supported on the Plato shaft 2, and at the other end,
A tractor shaft 16 is rotatably supported. The tractor shaft 16 has a circular cross section at both ends so as to be rotatable, and the middle section is a square shaft to enable transmission of power. A tractor gear 17 is fixed to the tractor shaft 16, and meshes with a tractor lever 14.15 (rotatably supported on a side plate of the machine that constantly meshes with the platen gear 4). Reference numeral 19 is a paper ejection roller and paper receiver. It is inserted into the square shaft portion of the tractor shaft 16, can move freely in the axial direction, and rotates together with the tractor shaft 16. The paper ejection roller 19 is made of a material with a high surface friction coefficient such as rubber, and its outer peripheral surface is provided with irregularities at a predetermined pitch at the paper ejection angle.

Reference numeral 20 denotes a bin wheel constituting the tractor, which is rotatably held by the tractor guide 21 and slidably inserted into the square shaft portion of the tractor shaft 16. 22 is a tractor which can be opened and closed around a hinge bin 23. 24 is a tractor guide rotation stopper shaft, and a guide plate 25
．． 26 to stop the tractor guide 21 from rotating about the shaft 16. The guide plates 25 and 26 are rotatably supported on the tractor shaft 16.

A front guide shaft 27 is supported between side plates (not shown). 28 is a rear guide shaft, which is also supported between side plates (not shown). 29 is a carrier, and the front guide shaft 27
．． It is slidably supported by a rear guide shaft 28, and a print head 30 and an ink ribbon cassette 31 are mounted on the upper part. The ink ribbon cassette 31 stores an ink ribbon 32 having four layers of color bands in the width direction, and the hinge portion 31a is rotatably supported by the arm 29a of the carrier 29, so that the tip of the print head 30 It is possible to change the usage position of the ribbon 32 in the vertical direction. Here, as shown in FIG. 2, rack teeth 31b, 31c, and 31d are provided near the printing part of the ink ribbon cassette 31 to switch the ribbon cassette according to the ribbon color.
, 31e, and a projection 31f that is pushed up by a switching arm, which will be described later.

A control rail 33 is attached to the yoke 34. A conical cam surface 35a having an end portion 35b is provided at the tip of the plunger 35 of the control solenoid 33.

Reference numeral 36 designates a switching arm, which includes a switching pin 36a that engages with a cam plate to be described later, a pressing end 36b that comes into contact with the protrusion 31f of the ribbon cassette 31 mentioned above, a holder 36c that comes into contact with the plunger end 35b of the control solenoid 33 mentioned above, and a yoke. It is rotatably supported on an arm shaft 37 fixed to 34. 38 is a switching arm spring, and arm shaft 37
is inserted into the switching arm 36, and the other end is inserted into the carrier 2.
9 is fixed to the hook portion (not shown) of the switching arm 36.
is always biased in the direction of being inserted into the arm stopper 39. The arm stopper 39 is provided to protrude from the yoke 34. Further, the switching arm spring 38 uses its coil portion to constantly press the switching arm 36 against the plunger one end 35b.

A cassette lock lever 40 is rotatably supported on the arm shaft 37, and one end 40a is connected to the rack teeth 3 of the ribbon cassette.
The spring 41 is always biased in the direction of engagement with 1b-e. The other end of the cassette lock lever 40 is in contact with the tip 35b of the conical cam surface 35a of the plunger 35, and when the control solenoid 33 is energized and the plunger 35 is sucked to cause the plunger end 35b to protrude,
The cassette lock lever 40 is locked by the conical cam surface 35a.
In this case, the tip 40a rotates in the direction of separation (direction B) by the rack teeth 31b-e and releases the engagement with the rack teeth! Wear. At the same time, the switching arm 36 is pressed, and the switching pin 36a is fixed at a position where it engages with a cam plate 47, which will be described later. 42 is a screw that fixes the yoke 34 to a predetermined position on the carrier 29.

Again in FIG. 1, reference numeral 43 denotes a tension pulley, which is rotatably supported by a pulley shaft 44 protruding from the bottom plate of the printer (not shown). 45 is a carrier drive motor, which is a stepper motor that rotates in synchronization with a predetermined pulse. A timing belt 46 is stretched between the tension pulley 43 and a motor pulley (not shown), and one end is fixed to the lower part of the carrier 29. According to the rotation angle of the carrier motor 45, the carrier 29 is rotated by a predetermined amount. It can be moved in the digit direction (guide axis direction).

47 is the aforementioned cam plate, which has a pilot hole 47a that can be moved in the digit direction, and this long hole 47a is moved by a slide shaft 48;
They are supported so that they do not fall through. The slide shaft 48 is fixed to the bottom plate of the printer (not shown).

The cam plate 47 includes a ribbon switching cam 47b, a cam portion 47c for rotating the left paper bail arm 50-1 (described later), a cam portion 47c for rotating the lock lever 10 described above, and a right paper bail arm 50-2 (described later). It has a cam part 47d for rotating it, and also has a retaining part 47f. Furthermore, the cam plate 47 is integrally provided with a stopper plate 4.
7e is provided, and is pulled in the C direction by a return spring 49.

Reference numerals 50-1 and 50-2 denote the aforementioned paper bail arm, which is rotatably supported at a predetermined position on the front guide shaft 27, and is connected to the aforementioned cam portion 47c of the cam plate 47,
It has arms 5O-1a and 5O-2a that come into contact with the left and right stopper plates 47d, and rotation stops 5O-1b and 5O-2b whose rotation is regulated by coming into contact with the left and right stopper plates 47e.

A paper cutter 51 is fixed to the tips of the other arms 5O-1c and 5O-2c of each paper pan arm, and has a scale 51a engraved on the front surface thereof to indicate the printing position.

A slider 52 is slidably fitted to the cutter 51 with a predetermined frictional force, and rotatably holds the bail roller 53 as shown in FIG. The slider 52 is made of a resilient material such as plastic.
The bail roller 53, which is held between the paper bail arms 50-1 and 50-2 in a manner of 0 or more, generates a fitting pressure for the cutter 51 and prevents the bail roller 53 from hitting unevenly. 2 is urged clockwise by a spring SP, thereby being pressed against the platen l. 54 is a paper pan for guiding the printing paper.
It is fixed to a side plate (not shown).

Pinch rollers 55a and 55b have several pinch rollers formed at a position facing the platen 1 and pressed with a predetermined pressure by a spring (not shown).

Reference numeral 56 denotes a cutter cover, which is rotatably supported by the exterior case of the printer, and when the above-mentioned paper ejection roller 19 is located above, it is biased by a spring (not shown) to press the surface of the cutter cover and release the recording paper onto the paper ejection roller 19. It has the function of imposing.

In FIG. 1, reference numeral 57 denotes a paper feed cassette detection switch provided on the mounting plate 5B, and the switch is turned on when a paper feed cassette, which will be described later, is attached.

58 is a mounting plate provided below the bin wheel 20;
It has a groove 58a for positioning the paper feed cassette and is fixed to a bottom plate (not shown). Reference numeral 59 denotes a paper fish detection switch composed of a reflective photointerrupter, which is fixed to a bottom plate (not shown).

FIG. 3 shows a paper feed cassette. In the figure, 60 is a cassette case for storing a plurality of cut sheets 61, and an upper lid 64, which will be described later, is held by hinges 60b, 60b so as to be openable and closable in the D direction. There is. Moreover, the cassette case 60 is
Hook portion 60a that engages with lock claw 64a of upper lid 64
, and the groove 58a of the printer mounting plate 58.

Claw portions 60c, 60c, which fit into 58a, are provided protruding from both sides, respectively. Further, as shown in FIG. 4, the cassette case 60 includes a push plate 62 for lifting the cut paper upward and pressing it against a paper feed roller 65, which will be described later, and a spring 6B for applying pressure to the push plate 62. Separation claws 63 for separating sheets of paper one by one are attached to both ends. As described above, the upper lid 64 is rotatably attached to the hinge portion 60b of the cassette case 60, but normally the hook portion Boa is engaged with the lock pawl 64a to prevent it from opening. 65 is a paper feed roller fixed to the paper feed roller shaft 66, and is made of a material with a high friction coefficient such as rubber and is shaped like 67.
is firmly attached.

This paper feed gear 67 is in the position shown in FIG. 9(a) when the paper feed cassette is attached to the mounting plate 58 of the printer, and can mesh with the B idle gear 7.

FIG. 5 shows the electrical configuration of the printer of this embodiment. Print data and command data are input into the printer from a host computer connected via an interface unit 70, and are temporarily stored in a RAM 72 via a central processing circuit (hereinafter referred to as CPU) 71. Roughly speaking, the CPU 71 sequentially reads data stored in the RAM 72 according to print commands, and reads out the data stored in the RAM 72 in accordance with the program stored in the ROM 73.
4. Operate the head driver 75, ribbon driver 76, and platen driver 77 to drive the carrier motor 45,
The head 30, ink ribbon feed motor 78, and paper feed motor 3 are driven and controlled to print on the paper on the platen 1. Here, the CPU 71 uses keys including the line feed key, online key, autoloading key 79, etc. Signals from the operation unit 80, the detection unit 81 that detects the position of the carrier 29 in the digit direction, the paper fish switch 59, and the cassette detection switch 57 are also constantly monitored, and optimal printing control is performed based on the detection signals from each part. do.

Furthermore, in this embodiment, the driver 82 and the control solenoid 33 are operated to shift the ink ribbon cassette 31 in the vertical direction to enable multicolor printing. A memory area 83 is provided in the RAM 72 to store information on whether to perform the following. RAM7
In addition to this, many memory areas necessary for printing control are formed in the printer 2.

In this embodiment, it is possible to select whether the fan-hold paper feed tractor is used to feed paper in a push-type manner or in a pull-type manner, and auto-loading (
In addition to the automatic paper loading function, automatic paper feeding of cut sheets can also be performed by installing a paper feed cassette.The correlation diagrams in Figures 6 to 9 and 9 1
Parents should use the timing chart in Figure 0 and the flowchart in Figure 11.

Push-in method> When using the tractor with the normal fan-hold paper push-in method, as shown in tls8rlJ (a), the tractor guide 21 is set at the rear of the platen l, and is held in place by a positioning member such as a click board (not shown). Fixed in position. At this time, the tractor gear 17 meshes with the B idle gear 7, and the forward rotation (arrow a) of the platen 1 given by the paper feed motor 3 rotates in the direction of the arrow d via the A idle gear 6 and the B idle gear 7. do. The fan-hold paper 61 is fed on the upper surface of the pinwheel 20, wrapped around the pline 1, and discharged upward.

The advantage of this pushing method is that there is no need to pull the paper that has passed through the platen to the tractor as in the pulling method, so the paper can be cut immediately after passing the platen, which eliminates the waste of one sheet of paper. In this embodiment, a paper cutter is provided at approximately the same position as the bail roller 53, thereby eliminating wasteful use of paper as much as possible.

When using the tension method, the track shaft 16 is lifted above the platen 1, and a positioning member (not shown) is used to move the track shaft 16 to the 8th F! ! Fix it in the predetermined position shown in J(b). At this time, the tractor gear 17 meshes with the C idle gear 18,
The direction of rotation is the same as the platen 1, which is the f direction. The fan-hold paper 61 inserted from the rear of the printer is wound around the platen L, passes over the top surface of the pinwheel 20, and is discharged rearward.

In both cases of pushing and pulling as described above, the rotation of the swing plate 5 is stopped by the hook portion 10a of the lock lever 1O and the stopper 11.

Auto loading> When performing automatic paper loading, the operator loads the cut paper 61-1 from behind the platen onto the platen 1.
and the pinch roller 55a, and press the autoloading key 79. FIG. 1O shows the timing of the operation of each part during this auto 6-zoink operation.

Move it in the Y direction (Fig. 1) and set it to the home position (90
) L, then moved in the X direction and stopped between engagement with the cam part 47b of the cam plate 47@47f (91). Here, the control solenoid 33 is energized (92), and the plunger 35 is activated. When the ribbon cassette 31 is sucked, the rack teeth 31b-e of the ribbon cassette 31 release the cassette lock lever as described above.
40 is removed, the ribbon cassette 31 falls to the lowest position due to its own weight and a spring (not shown) (94), and the switching arm 36 is pressed by the tip 35b of the plunger 35 and moves against the arm spring 38. It is pushed out along the axis 37 towards the platen. For this reason carrier 29
When roughly moved in the X direction, the switching pin 36a of the switching arm 36 and the engaging portion 47f of the cam plate 47, ! −、、
@Abutting and in synchronization with the movement of the carrier 29, the cam plate 47
also moves in the X direction. As the cam plate 47 moves, the stopper plates 47e and 47e also move, disengaging the paper bail arm from rotation stoppers 5O-1b and 5O-2b, and allowing the paper bail arm to rotate. The carrier 29 stops moving near the center of the printing range (95
).

Also, as the cam plate 47 moves, the cam teeth 47c, 47
At d, arm 5 of paper veil 7-m 50-1, 50-2
Push up O-1a and 5O-2a and rotate the paper bail arms 50-1 and 50-2 in a direction away from the platen l. At the stop position of the carrier 29, the cutter 51,
The paper bail roller 53 is fixed at a position sufficiently away from the platen l (see Fig. 4).The platen l is then rotated forward (in the direction A in Fig. 1) (96), and the cut paper 61-1 is The paper is fed by a predetermined amount while being sandwiched between the platen 1 and the pinch roller 55a.At this time, the leading edge of the paper is detected by the paper fish detection switch 59 provided at the bottom of the platen, and the cutter 51 is further rotated by a predetermined amount. The rotation of the platen 1 is stopped at a position where the leading edge of the paper is slightly upward.

When the carrier 29 is returned to the Y direction, the cam plate 47 follows the carrier 29 and returns due to the return spring 49, so the cutter 51 and paper bail roller 53, which were far away from the platen 1, also come into contact with the cut paper 61-1, and the platen Press 1.

When the carrier 29 is further moved in the Y direction, the cam plate 47
The long 47a comes into contact with the slide shaft 48 and stops (9
7), when the carrier 29 is further moved in the Y direction, the switching bin 36a of the switching arm 36 and the ribbon switching cam 47
b comes into contact with each other, and the switching arm 36 rotates clockwise in FIG.
Push up to change the printing position of the ribbon 32.

The desired color band is one of the rack teeth 31b to 31e,
By engaging with the cassette lock lever tip 40a, it is stopped at the printing position.

Further, the desired engagement between the rack teeth and the lock lever is determined by the amount of movement of the carrier 29 (98), and is fixed in that state by turning off the control solenoid 33 (99), and the ribbon cassette 1 is held in that position. Retained. When the control solenoid 33 is de-energized, the switching arm 36 is rotated about the shaft 37 by the switching arm spring 38, further retreated in the thrust direction of the shaft 37, and the contact with the cam plate 47 is released.

When it is not necessary to switch the ribbon cassette 31 after auto-paper setting, the control solenoid 33 may be de-energized during the return process of the carrier 29 from the center position (95) to the home position.

As a result, even if the carrier 29 moves back, the switching pin 38a of the switching arm 36 does not engage with the cam plate 47.
The ribbon force set 31 remains stationary, and the color band of the upper liquid layer of the ink ribbon always faces the printing position, which is the front surface of the print head. The most efficient printing is achieved by arranging yellow and cyan magenta in the three layers.

Automatic paper feeding> Next, to explain the automatic paper feeding operation, as shown in FIG. do. As a result, the paper feed cassette detection switch 57 is turned on, and the attachment of the paper feed cassette is electrically confirmed.

FIG. 11 shows the timing of the operation of each part during automatic paper feeding, and the paper feeding power set and detection switch 57 is ON.
If the autoloading key 79 is pressed while the CPU 71 is in the process of pressing the autoloading key 79, the CPU 71 determines that an automatic paper feed signal has been input and starts the automatic paper feed operation described below. The signal for starting this automatic paper feeding operation is as follows.

It is also input from the host computer connected via the interface unit 70, and is given from the computer especially when loading a new cut sheet in order to continue printing during a printing operation.

When the automatic paper feed signal is input, the cut paper 61-
The carrier 29 returns to the home position in the same way as during the autoloading operation in step 1. Also, in response to the automatic paper feed signal, the platen l starts normal rotation (direction A in Figure 1) (93), and the paper burl arm It continues to rotate until just before it leaves the platen 1. As a result, the paper on the platen is completely discharged to the outside.

The cut paper 61 discharged to the outside by the platen l is sandwiched with a moderate frictional force between the paper discharge roller 19 set above the platen and the inner cover 56 as shown in FIG. The paper is sent further upward, and the paper is ejected to
It is stored in the stocker 68 by the surface protrusion 9.

The stocker 68 is rotatably attached to the outer case of the printer so as not to get in the way when feeding the fan-hold paper.

Also, this review of the paper ejection roller 19 is gear train 4.18.1.
The rotation is transmitted from the platen 1 via the platen 7, and is the same rotation in the F direction as the rotation of the platen 1. Furthermore, the paper feed speed of the paper discharge roller 19 is set to be equal to or slightly faster than that of the platen 1, so that the cut paper is reliably delivered to the stocker 68.
It is designed to be discharged.

A trigger for the platen 1 to start rotating in the forward direction for paper ejection during the printing operation is given by the print line counter provided in the RAM 72 described above. That is,
When the printing of the last line of cut paper is completed, the CPU 71
starts the platen 1 to rotate in the forward direction, and the cut paper 6
1-1 is rotated by a predetermined amount sufficient to be discharged to the stocker 68.

Next, while the carrier 29 is moving from the home position in the X direction, the cam plate 47 also moves to the aforementioned switching pin 36a.
When the cam plate 47 is engaged with the engaging portion 47f, it moves in the X direction, but at this time, the cam portion 47d of the cam plate 47 touches one end portion 10. of the lock lever 10. b is pushed up, and the lock lever 1o and the rocking plate 5 are disengaged. Therefore, when the platen is rotated in the opposite direction (center direction in FIG. 9(a)) (100), the rocking plate 5 rotates in the same direction due to the friction with the platen shaft 2, and the B idle gear 7 and , the paper feed gear 67 is engaged, and the paper feed gear 67 rotates in the E direction.

FIG. 4 shows the platen so that the paper feed roller 65 rotates in the direction E by a predetermined amount, and the uppermost cut paper 61-1 stored in the paper feed cassette is pulled out by the separating claw 63 to form a predetermined loop. 1 and the pinch roller 55a.

Incidentally, the platen 1 against which the cut paper collides is rotated in the D direction, which is preferable for forming a proper loop.

After this reverse rotation, the carrier 29 is stopped at the center and the platen 1 is rotated forward (in the direction of manual rotation) by a predetermined amount (the amount by which the cut paper is fed to the printing start position), as in the autoloading of the cut paper described above. ) (101), and the carrier 29 enters the return operation. When platen l rotates forward.

The swing plate 5 comes into contact with the stopper pin 11 and stops, and when the cam plate 47 returns with the return of the carrier 29, the lock lever 10 engages with the swing plate 5. It is fixed at the position shown in FIG. 9(b).

As the paper feed gear 67 is disengaged from the B idle gear 7 by the forward rotation of the platen as described above, it becomes free, and even if the cut paper 61 is fed by the platen l during the subsequent printing operation, it will not synchronize with the paper. It can be rotated.

By repeating the above-described paper feeding and discharging operations, cut sheets are automatically fed and discharged continuously, but it is also possible to always perform the paper discharging operation before performing the paper feeding operation.

FIG. 12 is a flowchart showing automatic loading or automatic sheet feeding/discharging operation. When the autoloading key 79 is turned on in step S1, step S2
The next color band to be used for printing is stored in the memory area 53 in the RAM 72.

After that, in step S3, the carrier 29 is returned to the home position, and then moved again in the X direction in FIG.
In step 4, it is detected whether or not a paper feed cassette is installed. When the carrier 29 is not installed, it is determined that it is in autoloading mode and the carrier 29 is moved to the position shown in FIG.
) (Step S5), the control solenoid 33 is turned ON (Step S6), and the carrier 29 is moved again to the position corresponding to (95) in FIG. 9 (Step S7). Due to the movement of the carrier in S7, the paper bail arm 50-1.5
0-2 is separated from the platen 1, and the platen 1 is rotated in the normal direction in step S8.

When the paper switch 59 detects the leading edge of the cut paper 61-1 (step S9), the platen is further rotated in the normal direction so as to feed the cut paper from this position to the printing start position (step 5).
10), After this, in step Sll, the carrier 29
are layered in the Y direction, the paper bail arms 50-1 and 50-2 are rotated in the platen direction, and the paper bail roller 53 is pressed against the platen 1 through the cut paper.

During the return of the carrier 29, the CPU 71 determines whether or not the ribbon will be switched for the primary printing, that is, whether the ink ribbon 32
Step 512 determines whether to print using the top layer of the
Judgment shall be made. When ribbon switching is not to be performed, the control lens 33 is turned off before entering the ribbon switching process (step 313), the carrier 29 is returned to the home position and printing operation is started (step 514), and the ribbon switching is not performed in step 312. At some point, in step 315, according to the contents of the memory area 83, the control lens is turned on until the desired color band faces the printing position, at which point the control lens is turned off and the carrier 29 is turned on.
is returned to the home position, and step S14. to go into.

On the other hand, when the paper feed cassette switch 57 is turned on in step S4, it is determined that the automatic paper feed mode is in effect, and in step 316, first, cut paper must remain on the platen l, so the platen is rotated forward by a predetermined amount. let me,
Eject the cut paper.

After this, in steps 517-320.

Feed the cut paper 61-1 in the paper feed cassette so as to form a loop between the platen 1 and the pinch roller 55a, step S.
Enter 8.

As mentioned above, in this embodiment, the paper ejection roller and paper ejection tray, which were previously required for the automatic paper feeder as an option, are installed so that automatic paper feeding and ejection can be performed simply by installing the paper cassette. The paper feed roller is attached to the paper feed cassette, and the paper feed roller is attached to the paper feed cassette. Furthermore, the driving force for the paper feed roller 65, paper discharge roller 19, and tractor can all be extracted from the drive source of the platen, thereby further simplifying the entire structure.

Further, in this embodiment, since the paper ejection roller 19 and the tractor bin wheel 20 are provided on the common shaft 16, the entire spacer can be significantly reduced in size.

Further, in this embodiment, the paper feed roller 6 is attached to the paper feed cassette.
5 is attached, and this paper feed roller is operated by power obtained from the platen side, so the paper feed timing with the platen can be accurately determined, and the paper feed cassette can be made extremely compact.

In addition, in this embodiment, not only can the tractor be used in the pulling method and the pushing method, but also the paper feed cassette is installed in the space where the tractor is located in the pushing method, so the entire area is wide. Miniaturized.

Further, in this embodiment, by simply adding a small control solenoid 33, the paper bail can be raised and lowered and the color of the ink ribbon can be changed by the carrier drive source, and the structure can be simplified.

Further, in this embodiment, since the paper strength vine is provided immediately after passing the platen, no paper is wasted.

Furthermore, in this embodiment, the ribbon is switched and the paper veil is raised and lowered by moving the carrier within the printing range, so that the printer does not become larger in the printing direction.

Further, in this embodiment, the paper bail is raised and lowered by moving the carrier, and when the carrier comes to the center of the platen, the platen is rotated forward at this position to feed the cut paper to the printing start position. Therefore, the print head or a paper guide (not shown) fixed to the print head,
It guides the cut paper so that it does not bulge, allowing for reliable paper feeding.

Further, this embodiment is extremely efficient because it is possible to perform paper ejection, paper feeding, and ink ribbon switching while the carrier is reciprocating between the home position and the center position of the platen.

It should be noted that the present invention is not limited to the above embodiments, but can be applied to various devices such as thermal printers other than impact type.

Further, the present invention is not limited to the above embodiments, and can be modified in various ways.

(Effects) As described above, the present invention provides a power transmission mechanism (
The recording paper feed roller is connected via gears, belts, etc., and feeds the recording paper to the platen by rotating in a direction that conveys the cut paper to the paper feeding device side of the platen. This eliminates the need for a dedicated power source, and since the platen rotates to transport the cut paper to the paper feeder when the cut paper is fed, the cut paper is always at the same position relative to the platen. It will be stopped at

[Brief explanation of drawings]

Fig. W41 is a perspective view showing an embodiment of the present invention, Fig. 2 is a perspective view of the carrier portion, Fig. 3 is a perspective view of the paper feed cassette, and Figs. 4, 6, and 7 are perspective views of the paper feed cassette. Cross-sectional view of the printer when installed, Figure 5 is a block circuit diagram, Figure 8 (a)
, (b) are side views of the printer when using fan-hold paper, showing the push-type and pull-type cases, respectively. Figures 9 (a) and (b) are explanations showing the gear coupling relationship. FIG. 1 θ is a timing chart in autoloading mode. FIG. 11 is a timing chart in automatic paper feeding mode, and FIG. 12 is a flowchart. 1-111 platen, 3-111 paper feed motor. 8-1--swing plate, 10--1 lock lever, 19--1 paper ejection roller, 20--bin wheel, 29--carrier, 30--1 print head, 31- ---Ribbon cassette. 33--Control solenoid, 45--Carrier motor, 47--Cam plate, 50--Paper bail arm, 55--Pinch roller 1 60--One paper feed cassette , 65 --- one paper feed roller. 67---Paper feed gear, 68---Stocker

Claims (2)

[Claims] (1) In a paper feeding device that is detachably attached to a recording device and feeds paper to a platen of the recording device, the paper feeding device is connected to the platen via a power transmission mechanism and feeds cut paper from the platen to the paper feeding device side. A paper feeding device comprising a paper feeding roller that feeds cut paper in the paper feeding device to the platen by rotation in a direction in which the paper is conveyed. (2) The paper feeding device according to claim 1, wherein the paper feeding device has a structure in which the paper feeding roller is fixed to a case that stores cut sheets.