JPS6144666A - Printer - Google Patents

Abstract

PURPOSE:To promote the operational property of the blank setting operation by providing the blank setting mechanism which carries out a latching and latch releasing of a paper bail and the blank setting control means controlling a rotation of a platen. CONSTITUTION:Besides a paper bail is latched to a position where the paper bail 22 is released from a platen by the blank setting mechanism 29, the latch of the paper bail is released by the opposite direction rotation of the platen. An auto-set-switch 76 is operated by a switch arm of the bail lever 28, the line feed motor is driven controlled by the printer control circuit, and the rotation of the platen is controlled into the positive direction and opposite direction.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a printer, and more particularly to a paper setting mechanism.

In general, various types of printers such as type wheel printers, thermal printers, thermal transfer printers, dot impact printers, and typewriters, etc.
When setting paper, it is necessary to place the paper bail in a position where it is released from the platen, insert and set the paper, and then return the paper bail to the setting position where it contacts the platen.

Therefore, in the conventional paper set V& mechanism, the paper bail is held in that position by, for example, manually pulling the paper bail toward you, and by further pulling the paper bail toward you, a microswitch or the like is actuated to move the platen a predetermined amount or While the microswitch is in operation, it is rotated in the forward direction to set the paper, and then manually operated again to push the paper bail toward the platen to release the holding state, thereby completing the paper setting state.

However, manually operating the paper bail to set paper in this manner has the disadvantage that the paper setting operation is not easy to operate.

Purpose This invention has been made in view of the above points, and an object thereof is to improve the operability of paper setting operations.

1. In order to achieve the above object, the present invention latches the paper bail in a position where the paper bail is released from the platen, and releases the latch of the paper bail by rotating the platen in the opposite direction. The paper setting mechanism is provided with a paper setting mechanism that rotates the platen in the forward direction and then in the reverse direction when the paper setting mechanism latches the paper bail.

Hereinafter, a detailed description will be given based on one embodiment of the present invention.

FIG. 1 is an external perspective view showing an example of a type wheel type printer embodying the present invention.

The outer casing of this printer consists of a lower case 1 and an upper case 2 that house a mechanical section and a control section, and a cover 3 that can be opened and closed for replacing type wheels, ribbon cassettes, etc. is equipped with character scale 4.

In addition, the operation panel 5 attached to the front of the upper case 2 has
Although not shown, various switches such as an online/offline switch, line feed switch, and margin set switch, and various indicators such as a ribbon king display are arranged.

FIGS. 2 and 3 are a schematic plan view and a front view showing an example of the mechanism of this printer.

In this mechanical section, a platen 12 is rotatably mounted between frames 11 and 11, which wraps and feeds paper to be printed.

Referring also to FIG. 4, this platen 12 is
A line feed motor 13 consisting of a stepping motor fixed to motor gear 14 . Idle gear 15. Idle gear 1 that moves simultaneously with this idle gear 15
6 and platen gear 17 to automatically feed the paper.

The platen gear 17 has a shaft 18 as shown in FIG.
The tip of the detent lever 20 is rotatably supported by the detent lever 20 and biased by a detent spring made of a tension coil spring.

Additionally, knobs 21 and 21 are provided at both ends of the platen 12.
This knob 21.2 is fixed when removing the paper.
You can rotate it manually by turning 1 once.

In front of this platen 12 is a paper bail 2.
2 is biased toward the platen 12 and is swingably disposed.

In other words, referring also to FIG. 4, this paper bail 22 is constructed by pivoting both ends of a pail rod 24 on which a pail roller 23 is rotatably and movably mounted on a shaft 25 so as to be swingable, and a pail lever made of a tension coil spring. It is attached to a pail lever 27 and a pail lever 28 which are biased toward the platen 12 by a spring 26, and is arranged so as to be able to move toward and away from the platen 12.

A paper setting mechanism 29 is provided on the pail lever 28 side for latching and unlatching the paper bail 22 in the open position, the details of which will be described later.

On the other hand, a carriage 32 is mounted on rods 30 and 31 fixed between the frames 11 and 11 so as to be movable in parallel with the platen 12 in its axial direction. In addition,
Details of this carriage 32 will be described later.

A space motor 35 made of a DC motor is attached to the subframe 34, and a photo encoder (space sensor) 3S is attached to the space motor 35 to detect the rotation of its rotating shaft 35a.

Further, pinion gears 3 fixed to the rotating shaft 35a of the space motor 35 are mounted on both sides of the subframe 34, 34'.
A pulley 41 integrally formed with a gear 40 that meshes with the gear 8 is disposed with its shaft 41a rotatably mounted between the subframes 34 and 34', and a guide pulley 42 is mounted between the subframes 34 and 34'.
A is rotatably installed between the sub-frames 34 and 34'.

Then, a space wire 43 is stretched between these pulleys 41 and guide pulleys 42, and this space wire 43
The end of the carriage 32 is fixed to the side of the carriage 32, and the carriage 32 is moved parallel to the platen 12 by a space motor 35.

Next, details of the carriage 32 will be explained with reference to FIG. 5.

This carriage 32 includes a carriage block 51 slidably attached to the rod 30 in FIG. 3, and a rod 3 at the rear end.
a carrier frame 53 with a guide 52 that engages with the carrier frame 53;
are fixed together.

Note that the illustrations in FIGS. 3 and 4 are simplified.

These carriage blocks 51. D with a type wheel 55 attached to the tip on a carrier frame 52
A selection motor 56 consisting of a C motor, a photo encoder (selection sensor) 57 that detects the rotation of this selection motor 56, a print hammer 58 that hits the type on the type wheel S5, and a ribbon feed mechanism that feeds the ink ribbon. We are prepared.

The ribbon feed mechanism SS includes a ribbon feed motor 60. Drive gear 61. It consists of a feed gear 62 and a feed knob 63.

Also, this carriage! Carriage block 51 of I2
A paper guide 64, 64 shaped to follow the platen 12 at a predetermined interval is attached to the front side of the platen.

Furthermore, the carrier frame 5'5 of this carriage 32
Above is a ribbon cassette loaded with ink ribbon 65 (
A ribbon end sensor 67 consisting of a transmission type photosensor that detects the ribbon end protruding into the ribbon cassette 66 when the ribbon cartridge) 66 is installed.
It is installed.

Next, details of the paper setting mechanism 2 will be explained with reference to FIG. 6. Note that this paper setting mechanism was installed on the 6th day on the 2nd day.
The state shown in the figure is a set state in which the paper bail 22 is in contact with the platen.

In this paper setting mechanism 2, the pail lever 28 has a lever 71 that moves in conjunction with the rotation of the pail lever 28.
It is equipped with.

On the other hand, a reset ratchet 72 is fixed to the shaft 12a of the platen 12.

The latch lever 73, which has an arm portion 715a that can be engaged with the reset ratchet 72 and a first click portion 73b and a second click portion 73c that can be engaged with the lever 71, is pivoted on a shaft 74 so as to be freely swingable. In addition to supporting the pail lever 28, a tension coil spring 75 is engaged between the two parts of the pail lever 28.

Furthermore, a switch arm 2B is integrally formed at the rear of the pail lever 28 to operate an auto-set switch 76 consisting of a microswitch.

The auto-set switch 76 causes the switch arm 28 to rotate when the pail lever 28 is rotated to a predetermined position.
activated by a.

The operating state of this paper setting mechanism on the second day (including an enlarged view of the main part) is shown in FIGS. 7 to S, and the details will be described later.

FIG. 10 is a block diagram showing the control section of this printer.

This control section includes a printer interface 81 that inputs various data from the host system side, a printer control circuit 82 that also serves as a paper caddy control means that controls the entire printer, and a drive circuit 83 that includes various drive circuits. It consists of

The printer interface 81 is one such as Centronics parallel two interface or R8232C.
A serial interface is used to input various data such as character code data, space (carriage movement amount) data, line feed data, etc. from the host system side.

The printer control circuit 82 receives data from the printer interface 81 via the l1084 and controls each section using two microcomputers (hereinafter referred to as "microcomputers").

The microcomputer 85 has a CPU, ROM, RAM, and Il.
o, etc., and controls the line feed (paper feeding) operation and space (carriage movement) operation among the printer controls.

In other words, the microcomputer 85 outputs line feed drive data LFD to the line feed drive circuit 87 to drive and control the line feed motor 13 to control rotation of the platen 12, thereby controlling line feed and back line feed.

Further, the microcomputer 85 outputs space drive data SPD specifying the amount of rotation of the space motor 35 corresponding to the amount of movement of the carriage 32 and the direction of rotation to the space servo drive circuit 88, so that the space motor 35
is driven to perform a spacing operation in which the carriage 32 is moved by a required amount in a predetermined direction.

This space servo drive circuit 88 is a microcomputer 85
Based on the space drive data SPD from and the position signal Pc from the space sensor 36, the space motor'
55 is driven and controlled.

On the other hand, the microcomputer 86 controls controls other than space and line feed among the printer controls, such as printing and ribbon feed.

In other words, this microcomputer 86 outputs the hammer drive data HMD on the 8th day of the hammer drive circuit and outputs the hammer drive data HMD to the printing hammer 5.
By driving and controlling the Hanhan magnet S8A that constitutes 8,
The type letters on the type wheel 55 are struck by the hammer SBB.

The microcomputer 86 also outputs ribbon feed drive data RBD to the ribbon feed drive circuit 90 to drive and control the ribbon feed motor SO to feed the ink ribbon 65 of the ribbon cassette 66.

Further, the microcomputer 86 outputs selection drive data 5LED to the selection servo drive circuit 81, which specifies the rotation amount and rotation direction of the selection motor 56 corresponding to the rotation amount of the type wheel S5, and drives the selection motor 56 to rotate. Type wheel S
5 is rotated in a predetermined direction by a required amount to bring the desired type into a position where it is struck by the printing hammer 58.

The selection servo drive circuit 91 drives and controls the selection motor S6 based on the selection drive data 5LED from the microcomputer 86 and the position signal Ps from the selection sensor 57.

Also, the microcomputer 8 of this printer control circuit 82
5 inputs the autoset instruction signal from the autoset switch flow via l1092, and controls the line feed motor 13 to rotate the platen 12 in the forward and reverse directions according to the result. At the same time, it is determined whether or not there is a paper setting error, and if an error occurs, an alarm S3 is activated via a step 1092 to notify the operator of the error.

Furthermore, this printer control circuit 82.

The state signal of the cover open switch S4, which detects the opening and closing of the cover 3 shown in FIG. 1, is input via l1092, and processes such as stopping the printer operation when the cover is open are performed.

Next, the paper setting operation in this printer configured as described above will be explained with reference to FIG. 11 as well.

First, the operation of the paper setting mechanism 29 in this printer will be described with reference to FIGS. 6 to 9.

In this paper setting mechanism 2S, the paper bail 22
In the set state in which the lever 71 is in contact with the platen 12, the tip of the lever 71 is in contact with the first latch lever 73 as shown in FIG.
, IIj is engaged with a surface other than the click portion 73b and the second click portion 7c, and the latch lever 7
The arm portion 73a of No. 3 is not engaged with the reset ratchet 72.

From this state, pull the pail lever 28 toward you to release the paper bail 22 from the platen 12.

As shown in FIG. 7, the lever 71 engages with the first click portion 73b of the latch lever 73, and the paper bail 22 is held in this state.

At this time, the latch lever lever 3 and the reset ratchet 72
is not engaged, and the autoset switch 76 is not operating.

This is a state in which the paper bail 22 is released from the platen 12 so that, for example, skew correction work can be easily performed, and at this time, automatic paper setting operation is not performed.

When the pail lever 28 is further pulled in the direction of the arrow from this state, the lever 71 engages with the second click portion 73G of the latch lever 73, and the paper bail 22 is latched in this state. Also, the tip of the arm portion 7'5a of the latch lever 73 engages with the reset ratchet flap 2.

At this time, the autoset switch 76 is activated by the switch arm 28a of the pail lever 28, and the autoset instruction signal AS is sent to the printer control circuit 8.
2 is input.

As a result, the microcomputer 85 of the printer control circuit 82 controls the line feed motor 13 (details will be described later).
is driven and controlled to rotate the platen 12 in the forward direction (line feed direction) in the direction of arrow R shown in FIG. 8 by an amount equal to a predetermined amount It is rotated by a prescribed amount N in the direction of arrow S shown in the figure (backline feed direction).

At this time, the reset ratchet 72 is
Since it is fixed to the second shaft 12a, it rotates together with the platen 12.

Therefore, the reset ratchet 72 is moved in the forward direction (arrow R
direction), the reset ratchet 72 and the arm portion 73a of the latch lever 7!1 engage as shown in Figure S, so the latch lever 73 swings slightly in the A direction shown in the figure. Just do it.

On the other hand, when the reset 1 to ratchet 72 rotate in the opposite direction (arrow S direction), the latch lever 73 follows the rotation, is pushed down in the arrow B direction, and swings greatly.

Thereby, the second click portion 73 of the latch lever 73
c is disengaged from the lever 71, the pail lever 28 is rotated in the direction of the arrow by the restoring force of the pail lever spring 26, returning to the set state shown in FIG. contact with oppression.

Next, the paper set control process executed by the printer control circuit 82 will be described with reference to FIG. 11.

First, it is determined whether the autoset switch 76 is turned on (operated) or not. When the autoset switch 76 is turned on, the status signal from the cover open switch S4 is checked to confirm that the cover 3 is closed (cover closed). Determine whether or not.

At this time, if the cover 3 is closed, the carriage 32 is moved to a substantially intermediate position between the left margin and the right margin, which are transferred from the host system side or set by its own switch, or the left margin and right margin are not set. Sometimes, a carriage centering process is performed in which the carriage is moved to approximately the middle position of the platen.

This carriage centering process is performed to ensure the insertion of paper by guiding the paper with paper guides 64, 64 mounted on the carriage 32.

Then, the platen 12 is rotated in the positive direction (line feed direction) by a predetermined amount
After rotating in the positive direction (prescribed quantum N), the platen 12
Rotate in the opposite direction (backline feed direction) by the specified amount ff1N (specified amount -N) L, and return the paper to the normal setting position.

As a result, the paper bail 22 is unlatched in the paper setting groove 29 as described above.

Thereafter, it is determined whether the autoset switch 76 is in the off state. This determination process is performed to determine whether the paper bail 22 has returned to the set state.

That is, at this time, if the autoset switch 76 is in the OFF state, it can be determined that the paper bail 22 has returned to the set state, so the process returns to the main routine.

On the other hand, if the autoset switch 76 is in the ON state, it can be determined that the paper bail 22 has not returned due to some abnormality, so the platen 12 is moved in the positive direction again by a predetermined amount M (M=N may also be used). After rotating, it rotates by the predetermined amount M in the opposite direction.

Then, it is determined again whether or not the auto-set switch flow is in the OFF state, and if the auto-set switch 7 days is still in the OFF state at this time, an alarm S3 is sounded to notify the operator of the paper setting abnormality.

Thus, in this printer, by releasing the paper bail from the platen, the paper bail is latched in that position, and by rotating the platen in the opposite direction, the latch is released.

As a result, the paper bail automatically returns to the set state in which it contacts the platen upon completion of paper setting, which facilitates the paper setting operation and prevents the paper bail from being forgotten to return.

FIG. 13 is an external perspective view showing an example of an electronic typewriter embodying the present invention.

This electronic typewriter has one sentence:! A keyboard 111 for inputting graphic character data necessary for creating and editing IF (text), various format data such as left margin, right margin, tab, and other function data such as correct (correction) instruction data; a liquid crystal display (LCD) or L
It is equipped with a line display 112 consisting of an ED display, etc., and a printer 113 for printing text, layouts, etc.

FIGS. 13 and 14 are a schematic plan view and a front view showing an example of the mechanism of the printer 113 in this electronic typewriter.

In this mechanism section, the above-mentioned embodiment (FIGS. 3 and 4)
Mechanism unit, its pail lever 28 and paper setting machine [2
9 is replaced with a pail lever 128 and a paper setting mechanism 129, and the detent lever 20 of the line feed mechanism (FIG. 5) is omitted.

Further, the carriage 32 of this printer 113 has a collection tape for peeling off, and the ink ribbon 65
It is equipped with a collection mechanism that swaps the positions of the two.

Note that the other points are similar to the mechanical parts of the previous embodiment, so the explanation thereof will be omitted.

Therefore, details of the paper setting mechanism 129 will be explained with reference to FIG. 15. Note that in FIGS. 1!1 and 14, only some parts of this paper setting mechanism 12B are shown.

The paper setting mechanism 129 is in a set state as shown in FIG. 15, that is, the paper bail 22 is in pressure contact with the platen 12, and this set state will be described here.

First, there is an operation knob 131 on the shaft 12a of the platen 12.
A set lever 131 integrally formed with a is fitted so as to be rotatable in the directions of arrows P and Q, and a reset ratchet 132 is fixed.

The set lever 131 has a cam portion 131b.

It has a projection part 131c and a cam part 131d, and a stopper 133 is implanted at a predetermined position.

The pail set arm 135 includes a roller 128 rotatably attached to a protrusion formed in the middle of the pail lever 128.
A cam part 13Sa, step part 1 Sb, and step part 13Sc that are continuously formed and can be engaged with a, and a set lever 1 at the tip.
The arm 1!156 is rotatably equipped with a roller 13Sd that can be engaged with the cam portion 131d of the fixed shaft 1.
It is pivotably supported at 36.

The latch lever 138 is the projection 1 of the set lever 131.
31C has a first click part 138a and a second click part 138b which can be engaged, and is biased in the direction of the arrow by a tension coil spring 139 and supported swingably by a fixed shaft 136.

These pail set arm 135 and latch lever 1
38 constitutes a latch mechanism that releases the paper bail 22 from the platen 12 in conjunction with the rotation of the set lever 131 and latches the set lever 131 at that position.

The reset arm 140 has an arm 140a that can come into contact with the upper end of the latch lever 138, and is pivotably supported on the fixed shaft 136. Note that this reset arm 140
can swing only in the direction of the arrow, and swinging in the opposite direction to the direction of the arrow is restricted by a stopper 141.

The reset ball 143 has a ratchet 143a't- that can be engaged with the reset ratchet 132.

It is biased in the direction of the arrow by a tension coil spring 144 engaged between the pail lever 128 and the shaft 25, and is pivotally supported on the reset arm 140 by a shaft 145.

These reset ratchets 132. Reset arm 1
40 and the reset ball 143 constitute a latch release mechanism that releases the latch of the set lever 131 by the aforementioned latch mechanism by rotating the platen 12 in the opposite direction.

The autoset switch 147 is a microswitch, and is installed at a position where it is activated by being kicked by the end of the cam portion 131b when the set lever 131 is rotated in the direction of arrow Q to a predetermined position.

Further, below the platen 12, there is a pressure release bar 148 equipped with a pressure roller that is swung in the direction of the arrow P by the cam portion 131b when the set lever 131 is rotated in the direction of the arrow P.
9, it is biased toward the set lever 131 side.

The various states of the paper setting mechanism 129 during paper setting (including enlarged views of main parts) are shown in Figs. 16 to 20.
Although shown in the figure, the details will be described later.

FIG. 21 is a block diagram showing the control section of this electronic typewriter.

The control unit 150 is entirely controlled by a microcomputer control unit including a CPU 15I, a ROM 152, a text memory for storing text, text formats, etc., a RAM 153 which also serves as a format memory, etc.

The control unit 150 also controls the kana-kanji conversion dictionary memory 154. keyboard interface 155, display controller 156. Printer interface 15
7 and a floppy disk controller 158 for connecting a floppy disk.

Note that the control section of the printer 113 of this electronic typewriter has the control section of the printer of the embodiment shown in FIG. 10 and a circuit for driving the above-described correction mechanism and selecting the correction tenib. Since the only difference is in one point, the explanation thereof will be omitted.

Next, a paper setting operation in this electronic typewriter configured as described above will be explained.

First, the operation of the paper setting mechanism 129 in this printer will be described with reference to FIGS. 15 to 20.

As described above, the paper setting mechanism 129 is in the set state as shown in FIG. 15, and the paper bail 22 is in pressure contact with the platen 12.

When inserting paper, from this state, press the set lever 1.
31 is rotated in the direction of arrow P shown in FIG.

This causes the set lever to be moved as shown in Figure 1S.
The roller 135d of the pail set arm 135 that is engaged with the cam portion 131d of the pail set arm 131 is pushed and the pail set arm 135 swings in the direction of the arrow. Roller 1 of pail lever 128
28a is pushed, so the paper bail 22 is moved to the platen 1.
2 and released, and the paper bail 22 is held with the roller 128a of the pail lever 128 engaged with the stepped portion 135b of the pail set arm 135.

At this time, at the same time, the cam portion 131b of the set lever 131
As a result, the pressure release bar 148 is rotated and held in the direction of the arrow, and a pressure roller (not shown) is released from the platen 12, so that a sheet can be inserted.

Next, when setting the paper, move the set lever 131 to the 15th position.
Rotate in the direction of arrow Q in the figure.

As a result, as shown in FIG. 17(a), the pale set arm 1 is engaged with the cam portion 131d of the set lever 131! The +5 roller 135d is pushed, and the pail set arm 135 swings in the direction of the arrow.

As the pail set arm 135 swings, the roller 1 of the pail lever 128 is engaged with the recess 135a.
28a is pushed, so the paper bail 22 is placed on the platen 1.
2 and released 31, and the paper bail 22 is held with the roller 128a of the pail lever 128 engaged with the stepped portion 135c of the pail set arm 135.

At the same time, as shown in Fig. 17 (b), set tray / (
The protrusion 131c of -131 moves upward, so the latch lever 1! +8 swings in the direction of the arrow, the protrusion 131c of the latch lever 131 falls into the first click part 138a of the latch lever 138, the set lever 131 is held in this state, and the paper bail 22 is also moved to the platen 12. It is kept free from.

This is done by moving the paper bail 22 to the platen 1 as described above.
This is a state in which 1 is opened from 2 to facilitate skew correction work, for example, and no automatic paper setting operation is performed at this time.

At this time, the reset pole 143 is also
As shown in b), it swings in the direction of the arrow in response to the rotation of the set lever 131, but it is still engaged with the flange 133 of the set lever 131.

The ratchet 143a is the reset ratchet 1'52
It is held in a state where it is not engaged with.

Note that although FIGS. 17A and 17B show the same state, they are shown separately for the sake of explanation.

Therefore, from this state, move the set lever 151 further in the direction of arrow Q.
When the set lever 131 is rotated in the direction shown in FIG. 18, the projection 131C of the set lever 131 comes out of the first click part 138a of the latch lever 138 and engages with the second click part 138b, so that the set lever 131 is rotated. 131 and paper bail 22 are latched in their current state.

Also, at this time, the reset pole 143 is connected to the set lever.
131 is disengaged from the stopper 133, so that its ratchet 14''5a engages with the reset ratchet 132 (see also FIG. 1S).

At the same time, the autoset switch 147 is pressed and activated at the end of the cam portion 131b of the set lever 1'51.
The autoset instruction signal As is input to the printer control circuit of the control section.

Thereby, the printer control circuit drives and controls the line feed motor 13 to move the platen 12 in the forward direction (line feed direction) in the direction of arrow R shown in FIG. After rotating by the added amount, the platen 12 is rotated by a specified amount fiN in the opposite direction (backline feed direction) in the direction of arrow S shown in the figure.

At this time, the reset ratchet 132
Since it is fixed to the shaft 12a of the platen 12, it rotates together with the platen 12.

Therefore, when the reset ratchet 132 rotates in the forward direction (arrow R direction), the reset ratchet 13
2 and the ratchet 143a of the reset pawl 143 are engaged in the state shown in FIG. It does not rotate.

On the other hand, when the reset ratchet 132 rotates in the opposite direction (arrow S direction), the reset pawl 143 can follow the rotation of the reset ratchet 132, as shown in FIG. Because it moves in the direction shown.

Reset arm 140 rotates in the direction of the arrow.

Thereby, the arm portion 140 of the reset arm 140
Since the latch lever 138 is lowered by the lever a and swings in the direction of the arrow, the engagement between the latch lever 138 and the set lever 131 is released.

Therefore, the set lever 1!11 is rotated in the direction of the arrow from the state shown in FIG.
swings in the direction of the arrow, the pail lever 128 rotates toward the platen 12, returns to the set state shown in FIG. 15, and the paper bail 22 comes into pressure contact with the platen 12.

In this manner, the paper setting mechanism 129 latches the paper bail 22 in a position released from the platen 12, and
The platen 12 is rotated in the opposite direction to release the latched state.

Next, the paper setting process executed by the printer control section will be described with reference to FIG. 22.

This paper setting process is the same as the paper setting process of the previous embodiment shown in FIG.

However, as the line feed mechanism of this printer's mechanical part does not have a detent lever as mentioned above,
When rotating (returning) the platen in the opposite direction, after returning it by a predetermined amount n or a predetermined amount m (m = n), the gear is rotated again by a predetermined amount n (m) in the forward direction. Set position II due to backlash! This ensures that there are no errors.

In this way, even with this electronic typewriter, the paper bail is latched in a position where it is released from the platen, and by rotating the platen in the opposite direction, the latch is released and the paper bail is returned to the set state. , the same effects as in the above embodiment can be obtained.

In each of the above embodiments, an example in which the present invention is applied to a type wheel type printer has been described, but the present invention is not limited to this, and can be applied to various types of printers such as a dot impact printer, a thermal printer, a thermal transfer printer, an inkjet printer, etc. It can be implemented.

In addition, in the above embodiment, an example was described in which both the space motor and the selection motor were configured with servo motors, but they may also be configured with stepping motors and closed control using an encoder, or they may be configured using an encoder. Shina 11) may be used for open control,
This method is advantageous in terms of cost.

As explained above, according to the present invention, the operability of paper setting operation is improved.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing an example of a printer embodying the present invention, and FIGS. 2, 3, and 4 are a schematic plan view, front view, and left side view showing the mechanism thereof. FIG. 5 is a perspective view showing details of the carriage section, and FIG. 6 is a side view showing the paper setting mechanism. 7 to 9 are side views showing the operating states of the paper setting mechanism, respectively. FIG. 10 is a block diagram showing the control unit of this printer, and FIG. 11 is a paper FIG. 3 is a flow diagram showing set processing. FIG. 12 is an external perspective view showing an example of an electronic typewriter embodying the present invention. 13 and 14 are a schematic plan view and a front view showing the mechanism of the printer, and FIG. 15 is a side view showing the paper setting mechanism. 16 to 20 are side views showing the operating states of the paper setting mechanism, respectively. FIG. 21 is a block diagram showing the control section of this electronic typewriter. FIG. 22 is a flowchart showing a paper setting process similarly executed by the printer control section of this electronic typewriter. 12...Platen 13...Line feed motor 22...Paper bail 27.28,128...Pail lever 29.129.
・Paper setting mechanism 71 ・Lever 72, 132 ・Reset ratchet 73.138 ・
... Latch lever 76.138 ... Autoset switch S2 ... Printer control circuit 131 ... Set lever -1'55 ... Pail arm 143 ... Reset 1-arm 143 ... Reset pole Fig. 1 Figure 4 Figure 5 Figure 8 Figure 9 Diagram 115:... 17U; Day

Claims (1)

[Scope of Claims] 1. In a printer equipped with a paper bail, when the paper bail is placed in a position where it is released from the platen, the paper bail is latched at that position, and the paper bail is latched at that position by rotating the platen in the opposite direction. A printer comprising: a paper setting mechanism for releasing a latch; and a paper setting control means for rotating the platen in a forward direction and then in a reverse direction when the paper setting mechanism latches the paper bail. . 2. The paper setting mechanism includes a reset ratchet that moves together with the platen, and a latch lever that latches the paper bail in a position where it is released from the platen and releases the latch of the paper bail only when the reset ratchet rotates in the opposite direction. A printer according to claim 1.