JP2561254B2 - Serial printer - Google Patents

Description

The present invention relates to a printer used in, for example, an electronic typewriter, a facsimile machine, a personal computer, a word processor, or the like, and particularly, a recording head is arranged along a platen. The present invention relates to a serial printer that moves back and forth.

[Problems to be Solved by Prior Art and Invention] Conventionally used serial printers are specially designed to move up and down a recording head or to reciprocate a carrier equipped with a recording head along a platen. There was a motor.

Therefore, the above-described conventional serial printer requires a space for installing a plurality of motors, and thus has a problem that the device becomes large.

[Means for solving problems]

The present invention for solving the above problems, a platen,
A carrier reciprocating along the platen, a motor provided on the carrier, a recording head for recording on a recording sheet displaceably provided on the carrier, and a forward / reverse drive of the motor, A first drive transmission means for reciprocating the carrier along the sheet conveying path, and a second means for pressing the recording head against the platen and moving the recording head away from the recording head by the forward and reverse driving of the motor.
Drive transmission means.

〔Example〕

An embodiment of a serial printer to which the present invention is applied will be described below with reference to the drawings.

The embodiment described below is a carrier-moving type thermal transfer device, in which a carrier is mounted on a motor and a carrier pinion is driven to mesh with a rack provided on a printer base to move the carrier by itself. In addition to the above formula, the carrier releases the mesh with the rack at the left end and is connected to the paper feed mechanism to feed the paper, thereby providing a printer with a small motor load.

Further, the embodiments described below will be described by taking a thermal printer as an example, but the present invention is not limited to this, and if it is a so-called serial type, it is also applied to, for example, an ink jet printer or the like. is there.

FIG. 1 is an overall perspective view showing one embodiment of the present invention. The printer according to the present embodiment can load a so-called self-collection ink ribbon cassette, a two-color ribbon cassette, and a normal single-color printing ink ribbon, as described later.
By making full use of the characteristics of the attached ribbon, it is possible to perform single-color recording / multi-color recording and the recording correction. In the figure, reference numeral 1 denotes a base, which includes a left side plate 101, a right side plate 102, and a gear receiving plate 103. The left side plate 101 has shafts 101a, 101b, and
101c is erected. Further, the gear receiving plate 103 is provided with a guide hole 103a for holding a shaft of a bevel gear described later. On the front side of the base 1, a groove for holding a flexible cable (hereinafter abbreviated as "flexible") is provided.
104a, 104b, and 104c are provided. Further base bottom plate
In 105, a guide rail 105a is provided over the entire width. Reference numeral 2 denotes a rack which is provided at a predetermined position on the base 1 along a printing digit direction (recording direction), and a rack pinion of a carrier to be described later meshes during printing. The rack teeth 2a in which a plurality of rack teeth 2a are arranged at a predetermined pitch are formed so as to occupy a lower part of the tooth thickness of the rack 2. At the left end of the rack tooth 2a, one stop tooth 2b is provided over the entire width in the vertical direction of the rack 2. Further, the stop teeth 2b to 1
The start teeth 2c are provided with a predetermined width at positions corresponding to the upper portions of the rack teeth 2a at intervals of the teeth.
The rack 2 is provided with an upper guide surface 2d and a lower guide surface 2e for guiding a carrier described later. Reference numeral 3 denotes a paper pan, which is formed integrally with the base 1, and has two square holes 3a (one not shown) at predetermined positions into which pinch rollers to be described later enter.

Further, 4 is a paper feed roller (hereinafter abbreviated as PF roller), in which a disc-shaped paper guide 4a and a cross-shaped cross plate 4b are alternately arranged, and are integrally made of a plastic material such as polycarbonate or ABS. Is formed. Guide shafts 4c and 4d are similarly formed integrally at both ends of the roller 4, and the left side plate 101 and the right side
It is supported rotatably. Further, 5 is a paper feed rubber roller (hereinafter abbreviated as PF rubber roller), which is provided at a predetermined position with a gap from the RF roller 4, and rubber is wound around the peripheral surface thereof. In this embodiment, this
The RF rubber roller 5 is provided at four locations (two locations not shown).

That is, in the present embodiment, the guide shafts 4c and 4d, the disc-shaped paper guide plate 4a and the PF roller 5 are integrally formed, and the PF roller 5
Is coated with rubber to increase the conveyance force of the paper S as high friction. The guide plate 4a guides the sheet 3S with low friction. Here, the diameter of the guide plate 4a is slightly smaller than the diameter of the PF roller, but may be the same size.

Further, reference numeral 6 denotes a platen holder which is held between the left side plate 101 and the right side plate 102, and has the PF roller 4 described above.
A groove is provided at a position facing the guide plate 4a and the PF rubber roller 5.
6a are provided respectively. Also, the sheet S being transported is
The lower convex bent portion 6b of the holder 6 facing the gap between the PF roller 4 and the PF rubber roller 5 in order to guide the tip of the holder.
Are formed. That is, the lower end 6b of the holder 6
Means that in the gap between the PF roller 4 and the PF rubber roller 5, the sheet has entered inside from the outer peripheral surfaces of the rollers 4 and 5 (as viewed in the cross-sectional direction), and the conveyed paper erroneously enters the gap. Prevent it from getting lost. Also, the paper guide plate 4a and the PF roller 5 need not have a disk shape, but may have a circular arc portion.
The shape may be as shown in FIG.

On the other hand, on the front surface of the platen holder 6, that is, at a position facing a printing head to be described later, a platen 7 made of a sheet having elasticity and heat insulating effect such as urethane foam is attached along the printing / girder direction. The platen 7 keeps the paper at a predetermined position during recording by the print head. Reference numeral 8 denotes a pinch roller, which is in pressure contact with the PF rubber roller 5 and is lined with rubber so that the leading end of the sheet is easily bitten when the sheet is inserted (the other of the pinch rollers 8 is not shown). It is rotatable with a pinch disk made of a disk-shaped thin plate, and is arranged such that the side surface near the outer periphery of the pinch disk 9 abuts on the PF rubber roller 5 described above. The pinch disk 9 is pressed by a pinch spring 10 and rotates in synchronism with the PF rubber roller 5 to release the braking force due to the pressing force when there is no printing paper such as when printing paper is inserted. The pinch spring 10 also presses the center of the pinch roller 8 described above.

11 is a PF roller gear, which is the rotating shaft of the PF roller 4 described above.
It is attached to 4d and rotates together. Reference numeral 12 denotes a left platen knob, which is integrally attached to the PF roller 4. By manually operating the knob 12, the roller 4 is rotated. 13 is a release lever, which is the shaft of the PF roller 4.
It is rotatably fitted to 4d and is also rotatably attached to the right side plate 102. That is, by operating 13a, a paper release mechanism to be described later is operated to operate the pinch roller 5 and the pinch disk 9 described above. Can be canceled and the printing paper can be made free. Reference numeral 14 denotes a right platen knob, which is integrally attached to the PF roller 4.
Further, 15 is a PF gear and 16 is a shutter gear, both of which are rotatably supported by the shaft 101c of the left side plate 101.
As shown in FIG. 1 (b), the RF gear 15 is a two-stage gear consisting of a small gear 15a and a large gear 15b, and a notch 15c in a part thereof.
A cylindrical portion 15d having the above is provided at a position facing the shutter gear 16. Further, as shown in FIG. 10, the shutter gear 16 includes a feed tooth 16a having a normal tooth profile and a shutter tooth 16b in which a part of the tooth profile is cut out, and the tooth surface 16c is common to the feed tooth 16a and the shutter tooth 16b. The other tooth surface has two steps of 16d and 16e, and an abutting surface 16f is formed (the tooth portion is shown in a remarkable manner in FIG. 10). 16 g
Is a cylindrical portion around which a friction spring described later is wound.
Reference numeral 17 denotes a friction spring, which is wound around a cylindrical portion 16g of the shutter gear 16 with a predetermined tightening force, and an end 17a of which is engaged with a notch 15c of the PF gear 15. The notch 15c has an angle corresponding to 1.5 teeth of the large gear 15b, and the end 17a of the flexion spring 7 has the notch 15c.
The PF gear 15 and the shutter gear 16 can be freely rotated within the notch 15c by a certain amount of rotation, and when the relative rotation is performed by more than that angle, a predetermined braking action is given by the flexion spring 17. Will rotate. In addition, 18 is a compression gear, which is a groove 1 at the center of the tooth 18b.
8a is provided. 2 of this compression gear 18
The phases of the tooth traces of the tooth portion 18b are the same. Further, the inner diameter of the compression gear 18 is considerably larger than that of the supported shaft 101b.
Its core is not regulated by 1b. Reference numeral 19 is a grip ring, which is attached to a predetermined position of the shaft 101b and defines the thrust direction of the compression gear 18,
Is prevented from coming off the shaft 101b. Reference numeral 20 denotes a precession spring, which is stretched between a cylindrical portion 18c at the bottom of the groove portion 18a of the pretensioner gear 18 and the shaft 101a.
The pulley gear 18 is pulled so as to come into pressure contact with the small gear 15a. As a result, PF gears and compression gears
18, the backlash between the PF roller gear 11 and the PF roller gear 11 is removed (see FIG. 22 (a)). As an example of removing the backlash, as shown in FIGS. 22 (b) and (c). In addition, the torsion spring 20a or the tension spring 20b may be engaged with the groove 18a, and the same effect can be obtained.

A switch 21 is attached to a predetermined position on the base 1. 21a and 21b are contact pieces. 50 is a carrier, the rack 2 of the base 1 and the guide rail.
Guided by 105a, it is slidably mounted in the direction of the printing girder. A ribbon cassette 60 is mounted on the carrier 50.

Next, the internal structure of the carrier 50 will be described with reference to FIGS.
This will be described with reference to the drawings.

In the figure, reference numeral 501 denotes a carrier base,
A pair of guide portions 501a are provided on the left and right sides to guide the guide. A projection 501b for turning on the switch 21
Are provided at predetermined positions. Further described below. A shaft 501c, 501d, 501e, 501f that supports a rack roller, a gear, and the like, and a shaft 501h having a step portion 501g that supports a control lever described later are integrally provided. Further, a groove 501i for supporting a bevel gear described later and a groove 501j for supporting a flexible cable are formed. Reference numeral 502 denotes a pulse motor, and a shaft 502a has a motor pinion 503 fixed thereto and is attached to the carrier base 501.

504 is a center gear, a large gear 504a meshing with the motor pinion 503, a small gear 504b provided below the large gear 504a,
Bevel gear 504c, and ribbon drive gear 504d at the top
Are integrally formed. 504e is a spring clutch boss, and 504f is a head cam boss. Center gear 50
4 is the hole provided in the lower part of the shaft 50 of the carrier base 501.
It is supported by 1f, and the upper part is rotatably mounted with the root of the ribbon drive gear 504d guided by a hole in a carrier cover described later. Reference numeral 505 denotes an idler gear, which is rotatably supported on a shaft 501e and meshes with a small gear 504b of the center gear 504. Reference numeral 506 denotes a carrier pinion, in which a lower portion is provided with pinion teeth 506a having teeth all around, and an upper portion is provided with one synchro tooth 506c, and a guide ring 506e is provided in an intermediate portion.
Is provided. The guide ring 506e has a notch 506f between the synchronizing teeth 506b and 506c, and is equal to or slightly larger than the outer diameter of the other pinion teeth 506a. In the height direction of the carrier pinion, the pinion teeth 506a are at positions where they mesh with the rack teeth 2a, and
506c and 506d are at positions where they mesh with the start teeth 2c. The guide ring 506e is located at a position where the guide ring 506e does not abut against the rack teeth 2a and the start teeth 2c of the rack, and the guide ring 506e is incorporated so that the stop teeth 2b and the notches 506f are synchronized. The Carrier Pinion 506a is a carrier base 50.
It is rotatably supported by a shaft 501d.

 Next, the bevel gear unit 55 will be described.

Reference numeral 507 denotes a bevel gear, and a bevel gear 507a meshes with a bevel gear 504c of the center gear 504. Also 507
b is a bevel gear shaft provided with a key groove 507c. Further, a shaft portion 507d for press-fitting a stopping ring to be described later is formed at the distal end portion. Reference numeral 508 denotes a ratchet plate, which is provided with claws 508a at the tips of the four arms and is formed of an elastic plastic plate such as polyacetal.
The ratchet plate 508 is a key groove 507c of the bevel gear 507b.
It has a protrusion (not shown) which fits with the inside of the bevel gear shaft 507b and is slidably attached in the axial direction. 509 is a ratchet gear, which is composed of a gear portion 509a and a ratchet portion 509b, and the ratchet tooth 509c is a ratchet portion.
A large number of concentric circles are formed on one surface of 509b. Reference numeral 510 denotes a ratchet spring, which is a compression spring for pressing the ratchet plate 508 and the ratchet gear 509. Further, 511 is a stop ring, which is used for the bevel gear shaft 5
The ratchet plate 508 and the ratchet gear 509 are pressed into the shaft portion 507d of 07b and pressed by the ratchet spring 510 to prevent the ratchet plate 508 and the ratchet gear 509 from coming off. In addition, stop ring
511 is fitted in the guide hole 103a of the base 1 with a proper clearance. The center gear
The rotational force of 504 is transmitted from the bevel gear 504c to the bevel gear 507a of the bevel gear 507, and is transmitted to the ratchet plate 508 by the key groove 507c. And nail 508a and ratchet tooth 509c
Mesh with each other and are transmitted to the ratchet gear 509. Further, the claw 508a and the ratchet tooth 509 have a sawtooth shape and transmits a rotational force in one direction, but does not transmit the power in the opposite direction by the elastic force of the arm of the ratchet plate 508 and the ratchet spring 510. . Reference numeral 512 is a control cam, which has a groove 512a for hooking the end of a clutch spring described later, and also has a locking surface 512, a trigger surface 512c, and an inclined surface 512d for engaging a control lever described later, which has a predetermined angle. To
A and B are provided at two places (see FIG. 5A). The control cam 512 is rotatably inserted into the spring clutch boss 504e of the center gear 504. 513 is a control lever, 513a is a rotating hole, 513b is a spring hook, 51
Reference numeral 3c is a claw, which is rotatably inserted into the shaft 501h of the carrier base 501. Reference numeral 514 is a control lever spring, which is a compression torsion spring, and presses the control lever 513 so as to rotate toward the control cam 512 side, and at the same time, presses it against the step portion 501g of the carrier base.
A clutch spring 515 has one end 515a inserted into the groove 512a of the control cam 512. Further, the other end 515b is engaged with a pin of a head cam described later.
Then, the clutch spring 515 is inserted into the spring clutch boss 504c of the center gear 504. A head cam 516 is provided with a switching cam 517 for operating a switching lever described later at the uppermost portion. The switching cam 517 includes a sloped cam 517a, a switching groove 517b, and a cam surface 517c. Further switching cam
Below the 517, a ribbon feed cam 518 is provided. This ribbon feed cam 518 has a notch cam 518a / 5
18b and stop cam 518c are provided. Further, a print cam 519 is provided below the print cam 519, and a print head is pressed against the platen by pressing a head roller described later with a pressing portion 519a having a large diameter provided in a part thereof. Here, the head cam 516 is rotatably attached to the head cam boss 504f of the center gear 504 (the fifth).
Next, 60 is a head holder, and 60 is a head holder. The rotary shaft 60a has a vertical axis, and the shaft 501k of the carrier base 501 and the shaft of a carrier cover 70 (not shown) described later. It is rotatably held by and. Reference numeral 60b denotes a spring shaft, and reference numeral 60c denotes a cam roller holding plate composed of two upper and lower plates. An elongated hole 60d for guiding a cam roller described later is vertically opened. Further, 60e and 60f are spring hooks. Reference numeral 61 denotes a head spring, the coil portion of which is held by the spring shaft 60b, one end of which is hung on a spring hook 60f of the head holder 60, and the other end of which is hung on a cam roller groove described later. Numeral 62 denotes a cam roller, which has an outer diameter portion 62a in contact with the head cam 516, guide shafts 62b and 62c inserted into the elongated hole 60d of the head holder 60, and a head spring.
It is composed of a groove 62d that is received at one end of 61. Then, the cam roller 62 is pressed by the head cam 516, and a printing head 63 described later is pressed against the platen 7 by the spring force of the head spring 61. Here, the print head 63 is attached to the head holder 60. The flexible cable pulled out from the print head 63 passes through the inside of the carrier 50, is connected to the terminal of the pulse motor 502, and exits the carrier 50 through the groove 501j of the carrier guide 501, but the drawing is omitted.

Numeral 64 denotes a head return spring, which guides the coil portion on a rotating shaft 60a of the head holder 60, one end of which is hung on a spring 60e, and the other end of which is hung on a carrier base 501.

Reference numeral 70 denotes a carrier cover, which is a cassette loading section for detachably mounting a ribbon cassette 80 described later, which has guide pins 70a, 70b, 70c for guiding the cassette 80, and further includes the ribbon cassette 80 as a guide pin. Press
A claw 70d for preventing detachment is provided. 70e is an index, and 70f is a shaft that holds a switching cover described later. In the present embodiment, the cassette loading section 70 has a self-collection ink ribbon cassette 80a or 2 which will be described later.
Three types of cassettes, an ink ribbon cassette 80b for a color ribbon and an ordinary ink ribbon cassette 80c for one-color printing, can be exchangeably loaded.

A switching lever 71 is rotatably held by the shaft 70f, has a pressing pink 71a at its tip, and has a slide shaft 71b and a rotation stopping shaft 71c standing upright at the other end.

A switching slider 72 is slidably held by the slide shaft 71b of the switching lever 71, and has a U groove 72a and the rotation stopping shaft.
71c is engaged, and the rotation direction is restricted. Note that a claw 72d is formed in the lower part of the switching slider 72. Again 7
Reference numeral 3 denotes a switching slider spring which constantly pushes the switching slider 72 downward. Reference numeral 74 is a switching lever spring, which is stretched between the switching lever 71 and the carrier cover 70, as shown in FIG.
Direction). In FIG. 4, reference numeral 75 denotes a ribbon idle gear, which meshes with the ribbon drive gear 504d of the center gear 504, but the mesh is released by the rotation of the ribbon lever because it is held by the shaft of the ribbon lever described later. be able to. Reference numeral 76 denotes a ribbon lever, which is rotatably held by the carrier cover 70, and the shaft 76a holds the ribbon idle gear 75.The ribbon lever 76 has a ribbon lever arm 76b having a substantially U-shape. The head cam 516 is in contact with the outer periphery of the ribbon feed cam 518. 77
Is a ribbon lever spring for urging the ribbon lever 76 in the clockwise direction (direction of arrow C).

Reference numeral 78 denotes a friction clutch shaft, which is pressed into the carrier cover 70. 79 is a friction clutch (Fig. 3)
The lower gear portion (not shown) meshes with the ribbon idle gear 75, and the power is transmitted to the take-up spool 79a with a predetermined friction. The ribbon lever 76
Since the center of rotation is the same as the friction clutch 79,
Even when the ribbon idle gear 75 rotates, the engagement with the gear of the friction clutch does not come off.

Reference numeral 80 denotes a ribbon cassette, reference numeral 801 denotes a lower portion of the ribbon cassette, and reference numeral 802 denotes a ribbon cassette lid. Next, the internal structure of the ribbon cassette 80 will be described with reference to FIGS. In the figure, reference numeral 803 denotes a ribbon pancake. The ink ribbon R is guided from the ribbon pancake 803 in the order of the arrow, passes through the front surface of the print head 63, and passes through the delay roller 80.
4, guided by the delay lever 805 and the guide roller 806 and wound on the winding core 810. The winding core 810 fits with the winding spool 79a on the carrier 50 described above,
The rotational force of the take-up spool 79a is transmitted. The delay lever 805 is formed of a flexible material such as polypropylene and has a bent portion 805a. This bend 805a
Is thin enough to bend with a slight force. Reference numeral 807 denotes a delay lever return spring, which keeps the delay lever 805 always retracted. A delay spring 808 is disposed between the slider 809 and the delay lever 805. When the slider 809 is pressed, the delay lever 805 projects forward (in the direction of the platen) via the delay spring 808, and the delay roller 804 is pressed against the platen 7. I do. The bent part 8 of the day lever 805
On the front side of 05a, since the pin (not shown) guided by the slanted slit L formed on the lower ribbon cassette 801 and the ribbon cassette lid 802 is provided, the delay roller 804 presses against the platen 7. At this time, it advances diagonally leftward along the slit L and presses it at a position away from the print head 63 (see FIG. 9). The cassette may have a different shape depending on the type of ribbon to be stored, or may have a similar shape if a mark is attached. The point is that the claw 70d is guided by the guide pins 70a, 70b, 70c. The carrier cover 70 may be locked by the above.

FIG. 13 is a block diagram of an output device when the printer of this embodiment is mounted on an electronic typewriter. The operation of the printer of this embodiment is controlled by this output device. Here, the motor 502 and the thermal head 63 are connected to the thermal head driver THD and the motor driver MD via the flexible 22.

 Further, the switch 21 is connected to the detection unit.

In addition, 1014 is a power switch, 1015 is a keyboard, 1070
Is a liquid crystal display unit. In this embodiment, the keyboard
1015 is provided with a correction button a and a color designation button b. Therefore, as will be described later, when the self-collection ribbon cassette (single ribbon having a function of printing and correcting) is mounted on the carrier 50, the correction button a is turned on, so that the delay roller 804 is turned on. The record can be protruded to correct (lift off or cover up) the record. Further, the applicant filed a patent application filed with Japanese Patent Application No.
No. 260403 or Japanese Patent Application No. 60-298831 discloses an ink ribbon cassette (1)
When the color designation button b is turned ON while the carrier 50 is attached to the carrier 50 (a plurality of colors can be printed with a ribbon of a book), a color different from the basic color (for example, black) due to the projection or retreat of the delay roller 804 (For example, blue).

 Next, FIG. 13 will be described in detail.

In this figure, only the connection relation of each block is shown, and detailed control lines are omitted. The part enclosed by the dotted line is the CPU unit. The CPU is a central processing unit that reads programs and various data from a ROM or the like described later, performs necessary calculations and determinations, and performs various controls. Further, a plurality of CPUs may be configured. The ROM is a read-only memory and stores various programs for operating the CPU, character codes, dot patterns (character generators; CG), and various data required for printing. TRAM is a read / write memory that stores data during which the CPU is executing instructions, a working area for temporarily storing calculation results, a keyboard 1015, and various data input from an external interface unit IFu (described later). It consists of a buffer area, a text area for saving documents, etc. Data can be saved even if the power is turned off by turning off the power switch by the battery backup.

The CPU unit is connected to the printer unit via the thermal head driver THD, motor driver MD, and detection unit Su.
It is connected to Pu.

The thermal head driver THD is provided in the printer unit Pu under the control of the CPU. The thermal head 63 is driven, and the motor driver MD drives the motor 502 under the control of the CPU.

The detection unit Su transmits information of a limit sensor (not shown) provided in the printer unit Pu to the CPU.

Power supply PSu is power supply V for driving (heating) the thermal head 63
H, a power supply VM for driving the motor 502 and a power supply Vcc for other logic circuits.

The controller GA changes the voltage and the current of the power supply VH for driving the thermal head 63, changes the heating time and the duty of the thermal head 63, and performs various controls under the control of the CPU.

The CPU unit has a keyboard for inputting various data required for printing and editing via the keyboard connector KBC.
1015 is connected.

A liquid crystal display unit 1070 for displaying data and information input from the keyboard 1015 is connected to the CPU unit via an LCD connector LCDC.

Note that, instead of the liquid crystal display unit 1070, another display device such as a CRT may be used.

An interface such as an RS232C, a centro interface, and a modem for controlling the recording apparatus by an external control device and communicating with an external device can be connected to the CPU unit via an interface connector IFC.

In addition, the CPU unit has a cartridge connector CAC via a cartridge connector CAC for the operation of special functions and a ROM cartridge for printing in a separate typeface and an extended memory for storing documents, data, etc.
A RAM cartridge can be connected.

Further, an audio output device such as a buzzer may be provided although not shown in the figure.

The operation of the printer controlled by the above-described output device in the above configuration will be described.

First, head up and down operations will be described. When the motor 502 is rotated forward, the motor pinion 5
03 also rotates normally (direction of arrow A), and the center gear 504 meshing with the motor pinion 503 also rotates (direction of arrow B). At this time, the spring clutch boss 504e of the center gear 504
The clutch spring 515 wound around is also rotated synchronously. One end 515a of the clutch spring 515 is the control cam 512.
Since it is also integrated, the control cam 512 also rotates in synchronization with the center gear 504. Also, the claw 513c of the control lever 513 is attached to the slope 512d of the control cam 512.
On the control cam and
Stop 512 rotation. When the control cam 512 stops, the one end 515a of the clutch spring 515 is stopped, the one end 515a loosens, and the clutch spring 515 is released. Therefore, the clutch spring 515 stops without cyclic rotation with the sensor gear 504.

At this time, the sensor gear 504 continues to rotate. Assuming that the locking portion where the control cam 512 and the control lever 513 are locked is A, the head cam 519 at this time is assumed to be A.
Is at the position shown in FIG. 11A, and the pressing portion 519a is
Is pressed, and the print head 63 is pressed against the platen.

Also, the notch of the ribbon feed cam 518 (notch cam 518a / 5
18b) corresponds to (enters) the ribbon arm 76b of the ribbon lever 76, and the ribbon idler gear 75 meshes with the ribbon drive gear 504d of the center gear 504. Then, the rotational force of the ribbon drive gear 504d is transmitted to the friction clutch 74 via the ribbon idler gear 75.

Here, as described above, since the center gear 504 continues to rotate, the center gear 504 is transmitted to the small gear 504b, the idler gear 505, and the carrier pinion 506, and the carrier 50 is constantly moving on the rack 2.

And the head up (The thermal head 63 is the platen 7
When the motor 502 is rotated in the reverse direction by a predetermined pulse, the center gear 504 also rotates in the reverse direction (in the direction opposite to the arrow B), and the control cam 512 synchronizes with the loose torque of the clutch spring 515. Rotate. At this time, the claw 513c of the control lever 513 is repelled by the trigger surface 512c of the control cam 512 to the outer circumferential image. Next, when the control lever 513 is rotated in the forward rotation direction, the released control lever 513 is locked by the locking portion A which has been locked.
Cannot be locked, the control cam 512 can rotate forward and then rotate to the locking portion B. The state is shown in FIG. 11 (b). The head cam 519 releases the pressing of the cam roller 62, and the thermal head 6 is released.
3 is farther from platen 7. , Ribbon feeding cam 5 again
Since the ribbon lever 76 and the ribbon arm 76 are in contact with the outer peripheral surface of 18, the ribbon idler gear 75 is separated from the ribbon drive gear 504d, and the friction clutch 74 does not rotate and the ribbon R is not wound.

As described above, by reversely rotating the motor 502, the release of the lock between the control cam 512 and the control lever 513 is repeated, and the print head 63 moves down in the direction of the platen 7 and is pulled up in the direction away from the platen 7. Will repeat. In addition, if the carrier 50 moves in the reverse direction by the trigger at the time of head-up, the ribbon R will be loosened or stained or the motor load will increase. Therefore, in this embodiment, the gear train system is provided with a backlash more than the trigger rotation. When the trigger is reversed, the carrier 50 does not move in the reverse direction.

Next, the operation of the switching lever 71 will be described (see FIG. 11).

As mentioned above, in normal head-down, by triggering with B, control cam 512
Rotates and stops. At this time, a switching slider 71 slidably attached to one end of a switching lever 71 has a slope cam 517a of a switching cam 517 provided at the top of the head cam 516.
After passing through the upper surface of the switching groove 517b and above the cam surface 517c, the head cam 516 stops, so that the switching lever 71 does not rotate (FIG. 23 (a)).

Now, here, when the switching lever 71 is rotated, when the switching slider is positioned on the upper surface of the switching groove 517b of the switching cam 517 described above, the reverse rotation operation (second trigger) of the motor 502 in FIG. 23 (b). When the switch groove 517b is engaged with the claw 72d of the switch slider 72, the switch lever 71 is pushed out of the groove (in the outer peripheral direction). Therefore, the switch lever 71 is A in FIG. 23 (c). Rotate in the direction. At this time, since the switching slider 72 is pressed downward by the switching slider spring 73, the switching slider 72 is in contact with the cam surface 517c. Then, the rotation of the switching cam causes the head down to end and stop when the switching slider 72 is positioned on the maximum outer peripheral surface thereof. Therefore, the switching lever 71 rotates in the direction of arrow A, and the pressing pin 71a moves in the direction of the platen 7. Second to move
Figure 3 (d). At this time, in the cassette (two-color ribbon or self-collection ribbon) with the delay lever 805, the delay lever 805 is pushed toward the platen 7 by the pressing pin 71a, so that the delay roller 804 is pressed against the platen 7. (See FIG. 9).

At the time of head-up (when the motor 502 is reversed (triggered) and the head cam 516 is rotated,
Since it comes off the maximum diameter portion of the switching cam 517, the switching lever 71
4 rotates in the direction of arrow B in FIG. 4, and the pressing of the derailleur 805 by the pressing pin 71a described above is also released to return to the initial position.

As described above, according to the present embodiment, the delay lever 805 can be protruded or retracted at any time in the recording process, that is, regardless of the position of the carrier 50 in the recording area, thereby improving the recording speed. Can be.

As described above, with the movement of the carrier 50, the head is moved up and down, the ribbon is wound, and the switching lever is moved in and out. In this embodiment, all operations are performed by the motor. The control is performed by rotating the 502 reversely by a predetermined amount.

 Next, the paper feeding operation will be described.

First, the rotation of the motor 502 mounted on the carrier 50 is transmitted to the bevel gear 507, and the bevel gear 507 is always
It is rotating in synchronization with.

When the motor 502 is rotated in the reverse direction, the carrier 50 moves in the home position direction (left side in the figure) while rotating the bevel gear in the C direction.
9a meshes with the shutter gear 16, and the shutter gear 16
Is rotated in the D direction. At this time, the tooth surface of the shutter gear 16
The gear 16e meshes with the ratchet gear 509a. When the carrier 50 moves, the gear is deeply chewed in the tooth thickness direction while meshing with each other, but stops by contacting the abutting surface 16f. At this time, since the braking action (friction) of the friction spring 17 is applied to the shutter gear 16, the tooth surface of the ratchet gear 509 always contacts the tooth surface 16e of the shutter gear without being repelled. Here carrier 50
Move further, the ratchet spring 510 compresses, and both the ratchet gear 509 and the ratchet plate 508 move on the bevel gear shaft 507b of the bevel gear 507, but the torque is transmitted by the key groove 507c (FIG. 12 (a)). ')). On the other hand, the carrier pinion 506
Of the stop ring 2b of the guide ring 50
6e is rotating while contacting the stop teeth 2b (FIG. 12 (a)). In addition, shortly before the carrier pinion 506 comes off the stop tooth 2b, the contact pieces 21a and 21b of the switch 21 are pressed by the projections 501b of the carrier 50, and are electrically connected. Then, by detecting the conduction of the switch 21, the carrier is detected.
It can be confirmed that 50 has come to the predetermined position. When the switch 502 is turned on and the motor 502 is rotated in the reverse direction by a predetermined amount, the carrier 50 is brought into contact with the stop tooth 2b and the carrier pinion 506.
Stops when comes off. But the carrier pinion 50
The 6 can be rotated further. So Carrier Pinion 506
Stop at a predetermined position, and then rotate the motor forward,
The carrier pinion 506 rotates in the direction E (FIG. 12 (b)), but stops its forward rotation before the stop tooth 2b and the notch 506f engage (FIG. 12 (b)). At this time, ratchet gear
509 rotates in the F direction, so that it slides on the abutting surface 16f of the shutter gear 16 and passes between the feed dogs 16a, so that the PF gear 15
(FIG. 12 (b ')). At this time, the ratchet plate 508 also moves following the ratchet gear 509. When the PF gear 15 and the ratchet gear 509 mesh with each other here, the load on the ratchet gear 509 increases, so the ratchet plate 508
Pawls 508a-d and ratchet teeth 509c of ratchet gear 509
, And the rotational force of the motor 502 is released. The ratchet plate 508 releases the force in the F direction, but transmits the force in the C direction. Therefore, when the ratchet gear 509 and the PF gear 15 are meshed with each other now, when the motor 502 is rotated in the reverse direction again, the PF gear 15・ Precision gear 18 and PF roller gear 11
The rotational force is transmitted to rotate the PF roller 4, and the printing paper S can be fed by the frictional force between the paper feed rubber roller 5 and the printing paper. When the motor 502 is rotated forward after the printing paper S is fed by a predetermined amount, the ratchet 508 is rotated.
And the torque of the motor 502 is not transmitted to the PF gear 15, so that the PF roller 4 does not rotate in the reverse direction, and the carrier pinion 506 rotates in the direction of arrow G. And rack 2
After the start tooth 2c and the sync tooth 506b abut on each other, the rack tooth 2a and the pinion tooth 506a mesh with each other, and the carrier 50 starts moving rightward (FIG. 12 (c)). In addition, carrier 50
The PF gear 15, the shutter gear 16, and the ratchet gear 509 disengage from each other with the movement of. Ratchet gear 509 and PF
While the gear 15 is out of engagement, the ratchet 508 operates to release the rotational force. Guide hole 1 of left side plate 103
03a and stop ring 51 press fit into bevel gear 507
Since 1 is fitted, the gap between the PF gear 15 and the ratchet gear 509 can be accurately maintained when the ratchet gear 509 and the PF gear 15 are meshed with each other. Further, in the case where the paper feed amount is large, in this apparatus, the paper feed amount per rotation is one rotation or less of the carrier pinion 506. Therefore, the motor 502 is alternately rotated in the forward and reverse directions to continuously perform the paper feed. 50
Enables continuous paper feed without moving. Also, the motor 502
When the forward and reverse rotations are repeated, a backlash is generated between the motor pinion 503 and the PF gear 15. Paper is fed by adding pulses. This backlash correction is performed by the reverse rotation of the motor 502 and is always performed before the paper feeding operation is performed.

As described above, according to the present embodiment, the driving force of the motor 502 can be arbitrarily taken out so that the sheet S can be conveyed, so that the motor 502 is also used and the size and weight of the apparatus can be reduced. .

Since the compression gear 18 is always pressed against the PF gear 15 and the PF roller 11 by the compression spring 20, the backlash is removed. Also, press gear
18 is arranged in a direction in which the PF gear 15 bites in the direction in which it is pulled by the pressurizing spring 20 when feeding a paper with a large load, the spring force of the pressurizing spring 20 may be weak, and the load on the motor 502 increases only slightly. is there.

Next, the initialization (initial position setting) of the printer when the power is turned on will be described.

 FIG. 14 shows a timing chart.

When switch 21 is off, carrier 50
02 is rotated backward to return to the home position a. At this time, if the print head 63 is still down,
Since the head cam 516 rotates in the reverse direction by the reverse rotation of the motor 502, the head 63 is separated from the platen 7. At this time, when the stopper cam 518c of the ribbon feed cam 518 and the ribbon lever arm 76b of the ribbon lever 76 come into contact with each other, the clutch spring 515 is released and the rotation of the head cam 516 is stopped. The center gear 504 and the carrier 50 are provided for movement.

Then, when the protrusion 501b of the carrier 50 presses the contact piece 21a and the switch 21 is turned on, a predetermined amount of ramp down is performed and the carrier 50 is stopped. Next, the carrier 50 is moved in the forward direction to detect that the switch 21 is turned off, and if the motor 502 is rotated forward by the specified pulse, the index points to the first digit and the carrier 50 stops. During this time, the head 63 is moved down and up to remove the slack of the ribbon R. When the power is turned on and the switch 21 is ON, first
By rotating the 502 forward, the carrier 50 is moved rightward, and after confirming that the switch 21 is turned off, the slack of the ribbon is removed as described above, and the index is set to the first digit. That is,
The timing chart shown in FIG. 14 is to be operated from the portion A.

Next, the printing operation will be described. FIG. 15 is a timing chart of the printing operation.

First, when the power switch 1014 is turned on, the printer is initialized as described above, and the carrier 50 stops at the first digit. Then, characters and symbols are input from the keyboard 1015 (FIG. 13), and the printing operation is started by pressing the return key. Therefore, first, the motor 502 is rotated in the reverse direction to return the carrier 50 by a predetermined amount (a). Next, the carrier 50 is moved to the right by a predetermined amount (b), the control lever 513 is brought into contact with the B locking portion of the control cam 512, and then the motor 502 enters a reverse rotation operation (trigger operation) (c). Brings 63 down. Here, during the return operation of the carrier 50, the relationship between the control lever 13 and the control cam 512 is
Since the stop cam 518c of the ribbon feed cam 518 and the ribbon arm 76b are in contact with each other, as shown in FIG. 16 (a).
As shown in, the pawl 513c is in a state of being expected on the straight line of the slope 512d of the control cam 512. When the forward rotation of b is performed here, the control cam 512 and the control lever 513 are brought into contact with each other, and the trigger operation is started (FIG. 16 (b). Next, the reverse rotation of the motor 502 of c is performed (A The head-down operation is performed by applying a trigger) (d) At this time, the head-down ends at d ₁ , the run-up before printing is performed at d ₂ , and the printing (voltage is applied to the head) is performed at d ₃ . , D ₄ run after printing and finish printing.

At this time, the print head 63 is pressed down against the platen 7 while the head down is slowly taken down over time.
Since each head shape of the head cam 516 is set so that the friction clutch rotates after the ribbon R is started to be fed, there is no problem such as print head dirt.

The head f is rotated by applying the reverse rotation (B trigger) e of the motor 502. At this time as well, the ribbon R also stops winding after the head 63 has been pulled up, so the ribbon pulled out at the time of head down is wound up. Therefore, ribbon slack does not occur. In addition, since the heads up is done instantaneously,
It is possible to prevent the trailing edge of the print.

Now, after the head-up, the carrier 50 is returned to the left, and after detecting that the g ₂ switch 21 is ON, the g ₂ motor is further rotated by a predetermined amount. At this time, the movement of the carrier 50 has stopped as described above. Here, by performing the forward rotation H, the engagement with the PF gear 15 has been restricted by the shutter gear 16 until now, but the PF gear 15 and the ratchet gear 509 are engaged. Next, by performing reverse rotation i of the motor 502, the PF gear 15 and the PF roller gear 11 rotate to feed a predetermined amount of printing paper. When the motor 502 is rotated in the normal direction j after paper feed,
After a predetermined amount of rotation, the carrier pinion 506 meshes with the rack teeth 2a, the carrier 50 moves to the right, and stops at the first digit. The normal printing has been described above.

Next, the printing of the first layer ink on the self-collection ribbon or the so-called two-color ribbon (the ribbon disclosed by the present applicant in Japanese Patent Application No. 59-260403 or Japanese Patent Application No. 60-298831) will be described. The ink layer has a layered relationship with the first layer and the second layer. In this case, the ribbon cassette is selected by specifying the ribbon cassette from the keyboard 1015 and switching the ribbon mode, but the ribbon mode is automatically switched by a dedicated switching switch or a detection hole provided in the ribbon cassette and a contact provided on the carrier. You can go.
When printing the first layer ink of the self-collection ribbon or the two-color ribbon, it is necessary to peel off the ribbon R from the paper S at a steep angle after the printing head 63 is heated. Therefore doing slack of the ribbon R fed out from the head 63 by increasing the run-up d ₂ after Hetsudodaun in consideration of a case in which the winding timing of the ribbon R varies. FIG. 17 shows a timing chart of the motor 502 in this case. As shown in the figure, only a 'at the time of return of the carrier and d ₂ ' at the time of head down are different.

 The printing state in this case is shown in FIGS. 19 (a) and (b).

In the figure, 900 is a substrate of the ink ribbon R, and 901 is a multilayer ink layer. Reference numeral 63a denotes a heating portion of the head 63, and B1 denotes a recorded image.

Next, the collection operation of the self-collection ribbon will be described with reference to the timing chart of FIG.

First, in response to the input of the erase key a provided on the keyboard 1015, the motor 502 is reversed a and the carrier 50 is returned.
Next, the control lever 513 is set at b, and the motor 502 is reversely rotated (A trigger) c to start head down. Further, at d ₀ , the switching slider 72 turns the head cam 51
Since it comes to the position of the switching groove 517b of 6, the reverse rotation (C trigger) c'of the motor 502 for rotating the switching lever 71 is applied. The reverse rotation c '(C trigger) of the motor 502 is the normal reverse rotation c / e of the motor 502 when the head is down and down.
Since the amount of reverse rotation is larger than that of (A / B trigger), the carrier 50 moves slightly in the opposite direction, but since the head 63 has not yet pressed against the platen 7, there is no adverse effect on printing. Well motor
The reverse rotation (C trigger) of 502 causes the switching lever 71 to slightly rotate, and the switching slider 72 falls to the switching cam surface 517c to complete the set.

Next, in forward d ₁ of the motor 502, head 63 is pressed against the platen 7 continues down. At this time, the switching lever 71 and the pressing pin 71a also rotate, and the slider 809 of the ribbon cassette 80 is rotated.
Is pressed to press the delay roller 804 against the platen 7 via the delay lever 806 (see FIG. 20 (a)).

Next, at the position of the printing section B1, a voltage is applied to the head 63 and the heating section 63 is applied.
When a is heated and the ink is in a semi-molten state, printing area B
Peel off 1 from the paper S d ₃ (see FIG. 20 (b)). In this case, since Deirerora 804 is required run-up after printing to pass through a printing portion B1, the approach d ₄ is greater than the printing operation of the self-collection Chillon.

Next, the reverse rotation (B trigger) e of the motor 502 is performed, and the up f of the head 63 is performed. At the same time when the head 63 is pulled up, the switching lever 71 is reset, and the delay roller 804 also releases the pressure contact with the platen 7. Incidentally, the above-mentioned collection operation may be repeated only once in consideration of the smoothness of the sheet S, the difference in type, and the like.

Next, when printing the ink of the second layer in the case of using the above-mentioned two-color ribbon, the delay lever 804 is taken out and the ribbon R after printing is peeled from the paper S as in the case of erasing the self-collection ribbon. It may be delayed, and the same operation as erasing may be performed on the timing chart. That is, in printing, if the reverse rotation (trigger) of the motor 502 at the time of head-down is performed as reverse rotation c (A trigger) and reverse rotation c ′ (C trigger), the delay roller 804 presses the platen 7,
The timing of peeling the ribbon R from the paper S can be delayed.

〔The invention's effect〕

As described above, according to the present invention, the up / down operation of the recording head and the reciprocating movement of the carrier provided with the recording head can be performed by the common motor, so that the printer is small, lightweight and inexpensive. Can be provided.

[Brief description of drawings]

1 is an overall perspective view showing one embodiment of the present invention, FIG. 2 is a cross-sectional view of one embodiment of the present invention, FIG. 3 is an exploded perspective view of the carrier portion, and FIG. FIG. 5 is an enlarged perspective view of a control plate and a head cam, and FIG.
8 and 9 are left and right side views of one embodiment of the present invention, FIGS. 8 and 9 are plan views of the inside of the ribbon cassette of one embodiment of the present invention, and FIG. 10 is one embodiment of the present invention. FIG. 11 is a perspective view of the shutter gear, FIG. 11 is a state diagram for explaining the operation of the control plate and the head cam, FIG. 12 is a state diagram for explaining the operation of the carrier pinion and the paper feed mechanism in one embodiment of the present invention, FIG. 13 is a block diagram of an output device of an electronic typewriter using the printer of the present invention, FIG. 14 is a timing chart of carrier initialization, and FIG. 15 is an overall timing chart showing the operation of the printer of the present embodiment. Figure,
FIG. 16 is a state diagram showing the operation of the control plate, FIG. 17 is a timing chart for printing the self-collection ribbon, FIG. 18 is a timing chart for erasing the self-collection ribbon, and FIG. 19 is a timing chart for the printing. FIG. 20 is a diagram showing a state where the ribbon is peeled from the paper, FIG. 20 is a diagram showing a state where the ribbon is peeled from the paper at the time of erasing, FIG. 21 is a partial perspective view of another embodiment of the paper feeding device, and FIG. 22 is FIG. 23 is a perspective view of an embodiment for removing backlash, and FIG. 23 is a state diagram for explaining the operation of the switching lever. In the figures, 1... Base 2... Rack 4... PF roller 5... PF rubber roller 7... Platen 11 .PF roller gear 15 PF gear 16 shutter gear 18. Press gear, 21 ... Switch, 22 ... Flexible, 50 ... Carrier, 502 ... Motor, 506 ... Carrier pinion, 512 ... Control plate, 515 ... Catch spring, 516 ... Head cam, 55 ... Bevel gear unit, 63 Print head, 71 Switch lever 71 Press pin, 80 Ribbon cassette, 804 Day-lay roller, 805 Day-lay lever.

Claims (4)

(57) [Claims] 1. A platen, a carrier that reciprocates along the platen, a motor provided on the carrier, and a recording head for recording on a recording sheet that is displaceable on the carrier. A first drive transmission means for reciprocating the carrier along a sheet conveying path by forward / reverse driving of the motor; and a forward / reverse driving of the motor to press the recording head against the platen or move it away from the platen. And a second drive transmission unit for performing the serial drive. 2. The serial printer according to claim 1, wherein the second drive transmission means has a one-way clutch. 3. A serial printer according to claim 1, wherein when the recording head is separated from the platen, the reverse rotation of the motor is instantaneously driven. 4. A carrier is temporarily stopped when the recording head is separated from the platen.
The serial printer described in the item.