JPS6236259A - Sheet-head adjustment for printing device - Google Patents

Abstract

PURPOSE:To reduce the tape interval by reversely sending and discharging the next sheet nipped by a transport means simultaneously with the completion of discharge of the sheet for which printing in a printing part is completed and again nipping said sheet onto the transport means. CONSTITUTION:When the printing for the sheet P sent out one by one from a feeding roller 58 by a printing head 29 is completed, discharge of sheet P by a platen 19 and a discharge roller 241 is started. Then, the next sheet P is nipped between the platen 19 and a pressure roller 33. Simultaneously with the completion of discharge, the nipped sheet P is sent reversely and discharged by reversely revolving the platen 19. The sheet P is curved as shown by the dotted line in the figure, and the top edge of the sheet P uniformly contacts with the platen 19. Then, the platen 19 is normally revolved, and printing of each line on the sheet P is carried out by the printing head 29, and the sheet P is discharged. Therefore, the bending of the head part of the sheet P is prevented, and the sheet P is correctly resisted, and the high-speed printing work can be carried out by keeping narrow the interval between the preceding sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a sheet cueing method for a printing device such as a printer or a typewriter, in which a sheet such as printing paper is set at the printing position of the printing device.

[Technical background of the invention]

Generally, when printing on a plurality of sheets of paper continuously using a printing device such as a printer or a typewriter, a paper feed unit that automatically supplies the paper is attached to the paper feed port of the printing unit.

Some paper feeding units are equipped with a drive source, but
Recently, in order to reduce costs, some printers do not have a driving source, but instead obtain driving force from a printing unit to rotate a paper feed roller and feed sheets one by one to the printing unit.

Further, the printing unit grips the supplied paper between a platen and a pressure roller, supplies it to a printing position, and prints with a head that reciprocates along the platen.

An example of a printing device in which the driving force for the paper feed unit is obtained from the printing unit in this manner is disclosed in Japanese Patent Publication No. 58-6633.

In order to register the leading edge of the paper sent out by the paper feed roller, this printing device bends the paper by abutting the leading edge of the paper against the pressure contact between the platen and the pressure roller, and uses the stiffness of the paper to register the leading edge of the paper. are doing.

However, since the paper feed unit receives driving force from the print unit, when the paper feed roller is rotating, the platen must also rotate. On the other hand, in order to register the leading edge of the paper sent out by the paper feed roller, if the platen is rotated in the conveyance direction of the paper, the leading edge of the paper cannot be registered. For this reason, the platen is rotated in a direction opposite to the paper conveyance direction.

2. In other words, the paper sent out by the paper feed roller is brought into contact with the pressure contact between the platen and the pressure roller, which rotate in the opposite direction to the conveyance direction, and the paper is deflected to register the leading edge of the paper. The platen is rotated in the normal direction and the paper is set in the print position.

[Problems with background technology]

However, because the paper is in contact with the press between the platen and the pressure roller, which rotate in the opposite direction to the conveyance direction,
Not only is the leading edge of the paper bounced and not accurately registered, but the leading edge of the paper is also easily folded.

Also, since the platen and pressure roller are reversed and the paper is fed and registered by the paper feed roller, the platen and pressure roller are reversed and the paper is fed before the printed paper is completely ejected. When paper feeding by the rollers is started, the paper that is being ejected moves backward and a new paper is supplied, which may cause the two to overlap.

For this reason, paper must be fed while the printed paper is being ejected, which slows down the paper feeding speed and lowers the print processing capacity.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet cueing method for a printing device that has a high print processing ability and is capable of ensuring that the leading edge of the sheet is not easily bent during registration and that the leading edge of the sheet can be reliably registered.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention aims to transfer the sheet sent out by the feeding means such as the paper feed roller to the first side of the platen while the sheet is being ejected by the ejection means such as the paper ejection roller. After being held between the conveying means and the second conveying means such as a pressure roller, this sheet is once retreated and discharged, and then the sheet is returned to the first conveying means such as a pressure roller.
The paper is held between the conveyance means and the second conveyance means and is conveyed to the printing position.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

The printing device of this embodiment includes a printing unit 3 as shown in FIGS. 1 and 2 and a paper feeding unit 1 as shown in FIG.
01.

First, the printing unit 3 has a structure as shown in FIGS. 1 to 4.

As shown in FIG. 1, a frame 9 is provided inside the cover 7 of the printing unit 3, and a platen shaft 13 is rotatably supported on both sides 9L, 9R of the frame 9 via bearings 11L, 11k. . A platen knob 15L and a gear 17 are placed on the left side of the platen shaft 13, and a platen 1 is placed in the center.
9 is attached, and a gear 21 and a platen knob 15R are attached to the right side.

A motor 23 for driving the platen 19 is attached to the side 9R of the frame 9, and the driving force of the motor 23 is transmitted to the gear 21 via gears 24 and 25.

Further, as shown in FIG. 2, guide rods 26, 28 are provided parallel to the platen 19. A head carriage 27 is attached to these guide rods 26, 28 so as to be reciprocally movable, and the head carriage 27 is driven laterally along the guide rods 26, 28 by a drive device (not shown).

The print head 2 is mounted on the head carriage 27 as shown in FIG.
9. A tip guide 30 is attached, and a ribbon cassette 34 is detachable.

Furthermore, as shown in FIGS. 2 and 3, around the platen 19 there are pressure rollers 33, 35 arranged in two rows of platen guides 31, a pail roller 37, a platen cover 39, which presses the paper against the platen 19. etc. are provided.

The pressure rollers 33, 35 are shown in FIGS. 1 and 3.
By rotating the pressure lever 43 shown in the figure about the shaft 42, the roller 44 rotates the arm 46 attached to the shaft 45, and the guide 31 rotates about the shaft 45, causing the platen 19 to rotate. The pressure contact is zero or the pressure contact is released. Note that the arm 46 is attached to the roller 4 by a spring 48.
It is energized to 4.

Further, the paper pail roller 37 is connected to the paper pail lever 4
By rotating the arm 51, the arm 51 is rotated about the shaft 49, and the arm 51 is brought into pressure contact with the platen 19 or released from the pressure contact.

Note that a cup 53 above the head carriage 27 can be opened and closed, and the ribbon cassette 34 can be replaced in the open state.

The paper feed/discharge port 5 of the printing unit 3 configured as described above has a paper feed unit 1 as shown in FIGS. 5 to 1O, for example.
01 is installed.

As shown in FIG. 8, this paper feeding unit 101 supports a paper feed stacker 54 that accommodates stacked sheets of paper P by a pair of left and right side plates 56L and 56R as shown in FIG. The paper P is sent out to the platen 19 side.

(As shown in FIG. 8, the ll board 56L includes a storage portion 57, a flange 59, a support portion 61 of a support shaft 65 that supports the paper feed stacker 54, etc.).

In addition, as shown in FIG. 9, the storage portion 57 includes a shaft hole 69 that supports a rotating shaft 67 on which a paper feed roller 58 is attached, and a support that supports a manual feed guide 71 provided in front of the paper feed roller 58 from above and below. A shaft hole 77.79 is provided which holds a shaft 73.75. Although not shown, a confirmation window for confirming the home position of the drive transmission mechanism 55 for the paper feed roller 58 is provided.

A drive transmission mechanism 55 is housed in the housing portion 57, as shown in FIGS. 9 and 10.

First, a gear 107 that meshes with the gear 17 of the printing unit 3 is attached to the support shaft 81 .

Further, the rotating shaft 108 to which the paper discharge roller 241 is attached has a gear 109 that meshes with the gear 107, and the supporting shaft 85 has a gear 1.
A gear 111 meshing with 09 and a gear 113 smaller than this gear 111 are attached. Furthermore, the support shaft 87
A gear 115 that meshes with the gear 113 is attached to the support shaft 89, and a gear 119 that meshes with the gear 115 is attached to the support shaft 89.

A ratchet pawl 123 rotating about a shaft 121 and a temporary spring 125 biasing the ratchet pawl 123 toward the support shaft 89 are attached to the inside of the gear 119. A cam 127 that regulates the operation of the ratchet pawl 123
are attached to pins 91.93.95. Note that a color indicating the home position is displayed at one location on the outside of the gear 119 at a position corresponding to the confirmation window.

Furthermore, a gear 129 shown in FIG. 10 is attached to the support shaft 89. A ratchet 131 shown in FIG. 9 is attached to the gear 119 side of this gear 129. Shaft hole 69
The gear 13 meshes with the gear 129 via the support shaft 67.
3 is provided.

The drive transmission mechanism 55 configured in this manner is covered with a cover plate 147 as shown in FIG.

A chucking part 99 is attached below the housing part 57 that houses the drive transmission mechanism 55, as shown in FIG.

This chucking portion 99 includes a fitting portion 135 that fits into the bearing 11L shown in FIG.

On the other hand, the side plate 56R includes a flange 165, support portions 169, 171, 173, and a first
A chucking portion similar to the chucking portion 99 that fits into the bearing 11R shown in the figure is provided.

The support shafts 65, 73, 75 and the conveyance guide 134 are attached between the side plates 56L, 56R configured as above to provide rigidity, and the rotation shafts 67, 108
is rotatably mounted.

The support shaft 65.75 has a bottom plate 1 having an N-shaped side surface.
95 are attached via support plates 197 and 199.

This bottom plate 195 includes a back surface section 195A located at the rear, a stopper section 195B that holds the leading edge of the paper, a guide section 195C that guides the paper forward, and a support section 19 shown in FIG.
It is equipped with 5D. A paper feed frame 201 that supports the rear of the paper on the paper feed stacker 54 is removably attached to the rear surface portion 195A.

Further, a set lever 202 that moves the paper feed stacker 54 up and down is rotatably attached to the support portion 195D via a shaft 204. This set lever 202 is a lever part 20
2A and a cam portion 202B are integrally provided. A click spring 206 is installed between the support portion 195D and the cam portion 202B.

A paper feed stacker 54 is rotatably attached to the support shaft 65. As shown in FIG. 8, this paper feed stacker 54 is divided into a left stacker 54L having a side plate 203L and a right stacker 54R having a side plate 203R, and the left stacker 54L is fixed in the axial direction.
The right Z-socket 54R is movable in the axial direction.

On the back side of the left stacker 54L, as shown in FIG. 6, there is a bin 211 that engages with the cam portion 202B of the set lever 202.
A frame 213 having an arm 213L and a spring attachment portion 213R shown in FIG. 5 is attached. A spring 215 is attached between the spring attachment portion 213R and the back portion 195A,
The paper feed stacker 54 is always urged toward the paper feed roller 58 side.

'Side play) - A support shaft 217 is provided on the outside of 203L and 203R, and a support shaft 217 is provided on the outside of the separation levers 219L and 219R.
is attached through the attachment hole 221.

The separation levers 219L and 219R include a separation claw 223 that separates the paper P sent out by the paper feed roller 58 into one sheet, and a stopper 225 that restricts the amount of downward rotation.

Sponge rollers 227L and 227R are attached to both sides of the paper feed roller 58 on the rotation shaft 67 to which the paper feed roller 58 is attached.

The manual feed guide 71 supported by the support shafts 73 and 75 has arms 229L and 229L, which engage with the support shaft 75 on both lower sides.
29R, and a paper discharge frame 233 is attached to the upper part via a pair of support parts 231. Note that this paper ejection frame 233 constitutes a paper ejection stacker together with the recessed portion of the conveyance guide 134 and the manual feed guide 71.

The support part 231 has a slit 235 that engages with a notch provided in the upper part of the manual feed guide 71, and also has a stopper 237, and this stopper 237 and the manual feed guide 1
A leaf spring 239 is interposed between the support part 2 and the back surface of the upper part.
31 is fixed to a manual feed guide 71, and the manual feed holds the ID 71 on a support shaft 73.

A plurality of paper discharge rollers 241 are provided on the rotating shaft 108 as shown in FIGS. 5 and 8.

Further, the conveyance guide 134 forms a manual feed port 243 between it and the manual feed guide 71, and is formed in an N-shape so as to support the rear end of the paper P discharged by the paper discharge roller 241. Further, a static eliminating brush 245 is attached to the front surface of the conveyance guide 134 as shown in FIG.

The paper ejection guide 141 guides the paper P ejected from the printing unit 3 toward the paper ejection roller 241 side.
It has support plates 246L and 246K as shown in the figure, and is rotatably supported by side plates 56L and 56R about shafts 143 and 189.

The printing device configured as described above operates as follows.

First, rotate the lever part 202A of the set lever 202 shown in FIG.
1 to move the paper feed stacker 54 away from the paper feed roller 58.

Then, the sheets P are stacked on this sheet feed stacker 54 with their leading ends abutting against the stopper portion 195B of the bottom plate 195. At this time, the right stacker 54R is moved according to the width of the paper P.

Next, turn the platen knob 15L by hand while looking through the confirmation window provided on the side plate 56L, stop when the color indicating the home position is visible, and set the platen to the home position.

Then, the lever portion 202A is rotated clockwise as shown by the solid line in FIG. 6 to remove the cam portion 202B from the pin 211. As a result, the return force of the spring 215 causes the paper feed stacker 5 to
4 is urged upward, and the paper P is pressed against the paper feed roller 58.

In this state, when a print command is issued, the helad carriage 27 shown in FIG. 4 moves from the left end home position to the center side and waits for paper to be supplied.

Further, the motor 23 in FIG. 1 is driven to rotate as shown in FIG. 11, and the platen shaft 13 rotates clockwise in FIGS. 9 and 10. For this reason, gear 17.107.109.1
11, 113, and 115, the gear 119 rotates to the left. At this time, the ratchet pawl 123 is in contact with the inner circumferential surface of the cam 127, so it is not coupled to the ratchet 131. Therefore, the gear 129 does not rotate and no drive is transmitted to the rotating shaft 67, so the paper feed roller 58 does not rotate.

As the gear 119 rotates, the ratchet pawl 123 engages the cam 1.
When it is turned out from 27, it engages with the ratchet 131. Therefore, the driving force of the gear 119 is transmitted to the gear 129, and the paper feed roller 58 and the sponge rollers 227L, 227R rotate as shown in FIG. Rollers 227L, 22
While lightly pressing with 7R, feed the paper P by the paper feed roller 58.
Pushes out to 0.

At this time, both front ends of the paper P are caught by the separation claws 223, 223 and begin to bend. Then sponge roller 2
27L and 227R are deformed by the force caused by the bending of the paper. When the deflection of the paper exceeds the elastic limit, both front ends of the paper P bounce and are separated into one sheet, which passes between the guide section 195C and the manual feed guide 71 and is fed between the platen 19 and the pressure roller 33. .

When the motor 23 starts rotating and rotates by a predetermined amount M1 as shown in FIG. 11, that is, when the platen 19 and the pressure roller 33 grip the paper as shown in FIG. 12, the rotation of the motor 23 is stopped. .

Then, the motor 23 is reversely rotated by a predetermined amount M2. This causes the platen 19, which rotates in reverse, to eject the paper P.

Incidentally, when the platen shaft 13 is reversed, the gear 119 also rotates in the opposite direction, but since the ratchet 131 idles relative to the ratchet pawl 123, the drive is not transmitted to the gear 129, and the paper feed roller 58 and sponge rollers 227L, 2
27R stops.

As a result, the paper P is bent between the platen 19 and the paper feed roller 58, and the leading edge of the paper is bent to the platen 1 due to the stiffness of the paper P.
9 and the pressure roller 33.

Then, when the platen 19 rotates normally again, the paper P is gripped by the platen 19 and the pressure roller 33, and at the same time, the paper P is backed up and fed by the paper feed roller 58 at the rear.

When the gear 119 rotates further and the ratchet pawl 123 comes into contact with the inner peripheral surface of the cam 127, the ratchet pawl 123 separates from the ratchet 131 and the drive is no longer transmitted to the gear 129.

However, the paper P is connected to the platen 19 and the pressure roller 33.
．． 35, so the platen 19
The rotation of the paper P pulls the paper P away. Therefore, the paper feed roller 58 and the sponge rollers 227L and 227R rotate following the paper P.

When the motor 23 has rotated by a predetermined amount M33, the motor 23 is temporarily stopped, that is, at the printing start position of the paper P, and the print head 29, which was located at the center, is returned to the home position on the left side by the movement of the carriage 27, and printing is started. Start. - The motor 23 rotates one line each time printing for each line is completed.

The printed paper is guided along the guide surface of the paper ejection guide 141 and is ejected by the paper ejection roller 241 or
As shown in Figures 1 and 12, the paper ejection roller 241
While the next sheet is being ejected, the next sheet is sent out by the sheet feed roller 58, registered as described above, and sent to the rL printing position.

The paper ejected from the paper ejection roller 241 is ejected with its leading edge in contact with the manual feed guide 71 and the paper ejection frame 233, and its rear end is supported by the recessed portion of the conveyance guide 134.

According to the above embodiment, the following effects can be obtained.

(1) After the paper sent out by the paper feed roller 58 is gripped between the platen 19 and the pressure roller 33, the paper is moved backward to form a sag and register, so that the paper is not gripped. At this time, the paper is fed between the platen 19 and the pressure roller 33, which are rotating in the transport direction, so that the paper is smoothly gripped and the leading edge of the paper is not easily bent.

Furthermore, since registration is performed by spitting out the paper held in the mouth to form a sag in the paper, the registration can be performed reliably.

(2) While the paper ejection roller 241 is ejecting the paper, the paper fed by the paper feed roller 58 is sent to the platen 1.
9 and the pressure roller 33,
Since the paper is once retracted and ejected, and the paper is bent to perform registration, even if the paper that is being ejected moves back when the platen is reversed, the paper that is to be registered will also move back and will not overlap. Further, the paper ejection operation and the registration operation are performed in parallel, and the distance between the ejected paper and the paper supplied to the printing position is small, so that printing processing performance is not reduced.

(3) After the motor 23 has rotated by a predetermined amount M1 after the motor 23 starts rotating, the motor 23 is rotated in the opposite direction to register the paper P, so that the paper can be ejected without the need for a paper edge detection means such as a sensor; Can be resisted.

Therefore, this cueing method can be applied even to a printing device in which the printing unit 3 is not provided with a sensor for detecting the leading edge of the paper held between the platen 19 and the pressure roller 33.

That is, cueing can be performed without depending on the format of the printing unit 3.

[Modified example]

The present invention is not limited to the above-mentioned embodiment, and for example, the following modifications are possible.

(1) In the above embodiment, a printing device is shown in which the printing unit and the paper feeding unit are detachable, but the printing unit and the paper feeding unit may be integrated.

(2) In the above embodiment, after the platen 19 rotates and feeds the paper by the paper feed roller 58, the motor 23 is rotated by a predetermined amount M2 after rotating by a predetermined amount M1, and the pressure roller 33 is rotated by a predetermined amount M2.
Although the paper held by the platen 19 is ejected, a sensor may be provided at the tip of the pressure roller 33, and when this sensor detects the leading edge of the paper, the platen 19 may be reversed.

(3) As shown in FIG.
05.307 may be pressed into contact with the pulley latin 309.

In this case, once the paper has been held up to the pressure roller 305, the paper may be moved backward and discharged, or when the paper has been held up to the pressure roller 307, it may be discharged.

(4) In the above embodiment, the platen 19 is driven and the pressure rollers 33.35 are driven, but the pressure rollers 303, 305, 307 may be driven and the platen 309 is driven as shown in FIG. .

Also, the platen 309 and pressure rollers 313 and 305
．． 307 may be driven together.

(5) This invention is based on the platen 311 as shown in FIG.
is fixed, and the present invention can also be applied to a printing device in which paper guided by a guide 313 is fed to a printing position by rollers 315, 317, 319, and 321.

(6) This invention provides a guide 323 as shown in FIG.
The paper guided by 325 is transferred to rollers 327 and 329.
．． The present invention can also be applied to a printing device in which the printing position of the platen 335 is supplied by 331 and 333.

〔Effect of the invention〕

As explained above, according to the present invention, the stacked sheets are fed out one by one by the feeding means, and the fed sheets are pressed together! In a printing device in which the sheet is held between the first conveying means and the second conveying means, the sheet is conveyed to a printing position, printed, and then ejected by the ejecting means, while the ejecting means is ejecting the sheet. After the sheet sent out by the feeding means is held between the first conveying means and the second conveying means, this sheet is once retreated and discharged, and then this sheet is again transferred to the first conveying means. Since the sheet is held between the conveying means and the second conveying means and sent to the printing position, the leading edge of the paper is unlikely to break during registration (and the registration of the leading edge of the paper can be reliably performed). Accordingly, it is possible to obtain a sheet cueing method for a printing device with high printing processing capacity.

[Brief explanation of drawings]

Figures 1 to 4 are diagrams showing the configuration of the printing unit.
FIG. 2 is a cross-sectional view of the printing unit, FIG. 2 is a longitudinal sectional view of the printing unit, FIG. 3 is a sectional view showing a pressure roller pressure contact mechanism, and FIG. 4 is a view showing the structure around the print head. Figures 5 to 10 are diagrams showing the configuration of the paper feed unit, where Figure 5 is a vertical sectional view showing the overall configuration of the paper feed unit, Figure 6 is a left side view of the area around the paper feed stacker, and Figure 7 is a diagram showing the structure of the paper feed unit. is a right side view of the vicinity of the paper feed stacker, FIG. 8 is a partially cutaway plan view of the paper feed unit, and FIGS. 9 and 10 are diagrams showing the structure of the drive 1 delivery mechanism. . FIG. 11 is a timing chart for explaining the operation.
FIG. 12 is an explanatory diagram of the operation. FIGS. 13 to 15 are diagrams showing modifications of the present invention. 3...Printing unit 19----Platen 29...Axis print head 33, 35...Pressure roller 101-...
・Paper feed unit 58-...axis paper feed roller 241 axis 1・
Paper ejection roller No. 17/, L diagram! 3 ura! Ward 3 305″

Claims (5)

[Claims] (1) The stacked sheets are fed out one by one by the feeding means, and the fed sheets are held between the first conveying means and the second conveying means that are pressed together and sent to the printing position for printing. After that, in a printing device that discharges the sheet by a discharge means, while the discharge means discharges the sheet, the sheet sent out by the feeding means is transferred between the first conveyance means and the second conveyance means. After the sheet is held between the first and second conveyance means, the sheet is once retreated and discharged, and then the sheet is again held between the first conveyance means and the second conveyance means and sent to the printing position. A sheet cueing method for a printing device characterized by: (2) In the sheet cueing method for a printing device according to claim 1, the first conveyance means is a platen, and the second conveyance means is a pressure roller. How to cue the sheet. (3) In the sheet cueing method for a printing device according to claim 1, the first conveying means and the second conveying means are rollers that are pressed against each other. How to cue the sheet. (4) In the sheet cueing method for a printing device according to claim 1, the first conveying means is driven by a drive source, and the second conveying means is driven by the operation of the first conveying means. A sheet cueing method for a printing device characterized by being driven. (5) In the sheet cueing method for a printing device according to claim 1, the second conveying means is driven by a drive source, and the first conveying means is driven by the operation of the second conveying means. A sheet cueing method for a printing device characterized by being driven.