JPS6067182A - Printer - Google Patents

Abstract

PURPOSE:To bring a recording paper into close contact with the outside peripheral surface of a platen and securely guide and set the paper to a predetermined position, by turning a paper-setting roller in the same direction as a platen while clamping a leading end part of the recording paper by the roller. CONSTITUTION:The leading end of the recording paper P is detected by a detector 35, whereby a paper-setting lever 23 is turned counterclockwise for receiving the leading end part of the paper P, and is stopped at a predetermined position to stand by. Then, after the leading end of the paper P is passed between the platen 1 and the paper-setting roller 25 and is clamped by the force of a spring 26, the roller 25 is turned in the same direction as the platen 1 at a circumferential velocity slightly higher than that of the platen 1 while clamping the paper P, thereby feeding the paper P. Accordingly, the paper P is wound around the outside peripheral surface of the platen 1 in a close contact condition, and is securely guided and set to the predetermined position.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a printer that winds recording paper around the outer periphery of a platen to feed the paper and forms a recorded image with a recording head.

(Prior Art) Conventionally, in this type of printer, it is necessary to set recording paper before starting a recording operation, but there are the following drawbacks when sectoring the recording paper onto a platen. In other words, whether it is a wire R7 printer, a thermal #7 printer, or an inkjet printer, the space required for the print head to form a print image is limited between the print head and the platen that the head faces. ,d
-/It is difficult to install the e-guide. Therefore, when the platen is rotated to feed the recording paper, the leading edge of the recording paper does not wrap around the platen and hits the recording head), causing a jamming phenomenon of the recording paper. As a means to avoid this, the construction means shown in FIGS. 1 and 2 have been implemented.

The explanation will be given below according to the same figure.

FIG. 1 is a left front perspective view of a conventional embodiment, and FIG. 2 is a left side view of FIG. 1. In the same figure, l is a grating for wrapping and feeding the recording paper P around its outer periphery, and 2 is the platen 1.
The recording paper P is wound around the outer periphery of the platen L, and the platen 1 rotates counterclockwise in the direction of the arrow in FIG.
It will be sent to you. 3 is a recording head for forming a recorded image on the recording paper P; 4 is a carriage on which the recording head 3 is mounted; 5 is a guide shaft that fits with the carriage 4; and 6 suspends the carriage 4 together with the guide shaft 5. It is a subshaft. The carriage 4 is slidably guided by a guide shaft 5 and a sub-shaft 6. 7 is fixed to the carriage 4 with a synchronized belt, and is stretched by an idle pulley 8 and a drive pulley 9.

10 is a space motor that is directly connected to the drive pulley 9 and allows the system sheath motor 10 to rotate in forward and reverse directions.A carri-no-4 equipped with a recording head 3 slides on the guide shaft 5 and sub-shaft 6 in parallel with the platen 1. It has a movable structure. Reference numeral 11 guides the recording paper P fed by a protector fixed to the carriage 4 toward the platen 1 side, and reference numeral 12 guides the recording paper P guided by the protector 1 along a preset route. This is a Nofid board for.

The operation of feeding the recording paper P and guiding it along a predetermined route in the above configuration will be explained.

In FIG. 1, when the recording paper P is fed to the platen 1, a detector (not shown) detects the leading edge of the recording paper P, and the space motor 10 drives the carriage 4 to almost reach the platen 1. Move to the center. When the recording paper P is further fed in this state, the leading edge of the recording paper P is guided by the protector J1 to follow the route shown in FIG. When the recording paper P is further fed, it is guided by the guide plate 12 and fed to a predetermined route, completing the setting of the recording paper P.

Next, a recording operation is performed, but in a normal printer, the carriage 4 moves to the left, temporarily stops at a preset home position, and then moves to the right while printing the recording paper.
A recorded image is formed thereon.

When a conventional printer with the above configuration and operation is applied to an inkjet printer, the recording head-3
Ink droplets are ejected from the paper and collide with the recording paper P to form a recorded image, but the ink mist generated at this time adheres to the surfaces of the protector 11 and guide plate 12 near the recording paper P, and the attached ink is has the disadvantage that it stains the recording paper P.

Furthermore, when setting the recording paper P, the carriage 4 moves to approximately the center of the platen L and returns to the home position after completing the setting of the recording paper P, which takes extra time.
Furthermore, the recording paper does not adhere to the platen 1, and the recording paper P
The raised spots will adversely affect the quality of the recorded image, and the guide will be jealous. There were drawbacks such as hrs.

(Object of the Invention) The present invention has been made in view of the above-mentioned points, and its purpose is to bring the recording paper into close contact with the outer peripheral surface of the platen, reliably guide it to a predetermined position, and reduce the setting time. The goal is to provide printers that can.

(Structure of the Invention) In order to automatically set the recording paper on the platen, the present invention configures the Eie set roller shaft to be rotatable around the spindle, and controls the rotation of the circumferential surface of the platen in forward and reverse directions. However, when setting the recording paper, the leading edge is held between the set rollers and rotated in the same direction as the platen, which will be explained in detail below.

(Example) The present invention will be explained below based on an example. FIG. 3 is a right front perspective view showing the first embodiment of the present invention, FIG. 4 is a right side view of FIG. 3, and FIG. 5 is an explanatory diagram of the operation of one embodiment of the present invention.

First, the configuration when applied to an inkjet link will be explained with reference to FIGS. 3 and 4.

1 is a platen for feeding the recording paper P by wrapping it around its outer circumferential surface; 2 is a support shaft of the platen 1;

The recording paper P is wound around the outer peripheral surface of the platen 1 and is fed by the platen 1, which rotates clockwise 9 in the direction of the arrow in FIG. Reference numeral 3 denotes a recording head for forming a recorded image on recording paper P. As shown in FIG. It detects the flow velocity of ink ejected from the nozzle and checks that a normal recorded image is obtained.

13 is an LF motor using a pulse motor for rotating the platen 1 and feeding the recording paper P, and 14 is an L motor.
LF motor zori fixed to F motor 13, 15 is L
Synchronous belt 16 hung on F motor pulley 14
is the outer peripheral surface of the platen which is fixed to the support shaft 2 and transmits the power of the LF motor pulley 14 via the synchro belt 15 to rotate the platen 1.

Reference numeral 17 denotes a nozzle set motor which rotates the e-Passet lever 23 in forward and reverse directions along the outer circumferential surface of the platen 1 - a jitter using a pulse motor that is a power source, 18 a motor gear fixed to the shaft of the vapor set motor 12, and 19 This is an idle gear arranged to mesh with the motor gear 18, 2o is a 1' live shaft to which the idle gear 19 is fixed and transmits rotational force, and 21 is a drive gear fixed to the drive shaft 2o. One of each is fixed. Reference numeral 22 indicates a base A upper setter which is rotatable around the support shaft 2, and is engaged with the left and right drive gears 21, and is driven by the power of the upper A setter motor 17. 23 is fixed integrally with the PIE set gear 22, and has a 0-shaped groove 23a at its tip, and a sugering post 23 is formed on a line connecting the 0-shaped groove 23a and the support shaft 2.
b, and further has a fan-shaped cam 23a formed thereon. 24 is a vapor set roller shaft slidably inserted into and suspended in the O-shaped groove 23a of the target pass set lever 23, 25 is a vapor set roller rotatably inserted into the vapor set roller shaft 24, and 26 is a vapor set roller having one hard end.・
One end of the roller is hung on the end of the passet roller shaft 24, and one end of the roller is hung on the spring post 23b of the passet lever 23.
This is a spring that applies tension to the vapor set roller shaft 24 toward the center of the support shaft 2 and causes the recording paper P to be held between the outer peripheral surface of the platen 1 and the penoc set roller 25.
il 7 'ii d -7! A beno-e set lever detector 28 is for detecting a fan-shaped cam 23c forming a part of the set lever 23, and a first gravure roller 28 is pressed against the outer peripheral surface of the platen 1 and is used to feed the recording paper P.
91d A first pressure roller shaft 30, which rotatably suspends the first pressure roller 28, is pressed against the outer peripheral surface of the platen similarly to the first pressure roller 28, and a second pressure roller 31 for feeding the recording paper P. The second pressure roller shaft 32 rotatably suspends the second pressure roller 30, and the center portion thereof is connected to the lower seat guide 34.
It is fixed on both ends of the old 1 play 1. This is a leaf spring that is pressed against the Cisse roller shaft 29 and the armpit 2 pressure roller shaft 31 to press the first pressure roller 2g and the 27' pressure roller 30 against the outer peripheral surface of the platen 1. 33
3 is an upper sheet guide for guiding the recording paper P to the platen 1; 34 is a lower sheet guide for guiding the recording paper P to the bottom of the platen 1; 35 is attached to the upper sheet guide 33 and the lower sheet guide 34; A detector 36 detects that the recording paper P is fed to the platen 1, and a paper detector 36 detects that the recording paper P is set on the platen 1 and that the recording paper P is fed to a preset position. It is a tip detector. The arrow 37 indicates the rotation range of the passet lever 23, and the two-dot chain line at the tip of the arrow indicates the rotated position.

Next, referring to FIG. 5, the setting operation of the recording paper P will be explained.

First, each of FIGS. 5(a) to 5(e) illustrates the setting operation of the recording paper P in the order of each step.

FIG. 5(a) is a diagram showing a state in which no recording paper P is set on the platen 1. In the figure, when the recording paper P is supplied to the platen 1 from a recording paper feeding mechanism (not shown), A detector 35 detects the leading edge of the recording paper P. When the detector 35 detects the leading edge of the recording paper P, a control circuit (not shown) drives the passet motor 17 and the LF motor 13 shown in FIG. 4, and the platen rotates clockwise. K
- The passet handler 23 starts rotating counterclockwise.

At this point, the recording paper P is being fed by the driving force of a recording paper feeding mechanism (not shown).

Note that the fan-shaped cam 23c forming a part of the wave-passet lever 23 shields the target lever detector 27, and detects that the wave-passet lever 23 is at the home position.

FIG. 5(b) illustrates the next step, in which the bevel f set lever 23 driven by the paper set motor 17 rotates to a preset position and then stops, and the platen l is moved clockwise by the LF momo 13. The recording paper P is rotated in the direction C and is being fed from a recording paper feeding mechanism (not shown).

FIG. 5 (/) shows that the recording paper P runs one time through the platen and is fed to the first and second pressure rollers 28 and 30, and then the recording paper P is fed between the paper set roller 25 and the platen 1, and the spring 26 is activated. It shows a state in which the recording paper P is held under tension.The dimension t shown in the figure indicates the length of the leading edge of the recording paper P (-A?) being fed out from the center of the set roller 25; Leading edge of P - detector 35
The length is uniquely determined by converting the length into the number of steps of the LF motor 13 and driving the LF motor 13 by the converted value after the leading edge of the recording paper P is detected by the detector 35. When the recording paper P is fed by the length t from the set roller 25 (when the LF motor J3 has rotated by the set number of steps), the vapor set lever 23
is driven in the same direction as the platen 1, that is, clockwise, as shown by an arrow, by a vapor set motor 17 controlled by a control circuit (not shown). If the circumferential speed of the outer circumferential surface of the Silentine 1 is ω1, and the circumferential speed of the Passet roller 25 is ω2, then the relationship ωl<ω2 holds, which is determined from the drive pulse period of the E-Passet motor 17 and the motor gear 18. 4
- It is set by the tooth number ratio of a series of gears of the passet gear 22, and in order to prevent the recording paper P from sagging, the circumferential speed of the A set roller 25 is set to be about υl higher than the circumferential speed of the platen L. .

In FIG. 5), the front edge of the recording paper P is rotated clockwise by the platen 1 and the paper set roller 25 while being held by the system grinder 26, and the fan-shaped cam portion 23c of the paper set lever 23 is set to the vapor set position. Detected by lever detector 27,
FIG. 3 is a diagram showing the point in time when the vapor set motor 17 stops (the platen 1 is rotating clockwise).

FIG. 5(E) shows that the LF motor 13 further rotates the platen 1 clockwise, feeds the recording paper P, and detects the leading edge of the recording paper P with the paper leading edge detector 36. LF
FIG. 3 is a diagram in which the motor 13 has stopped and the recording paper P has been set at a predetermined position.

As explained above, in this embodiment, the detector 35 recognizes the leading edge of the recording paper P, and this causes the deflection passer set lever 23 to rotate counterclockwise, so that the front edge of the recording paper P After stopping and waiting at a predetermined position, the paper set roller 25 moves along with the platen 1 in the same direction as the platen 1, and after passing between the grooves 25 and being clamped by the force of the spring 26. Since the shiwa-passet roller 25 rotates and feeds the recording paper P while holding it at a slightly faster circumferential speed, the recording paper P is tightly wound around the outer circumferential surface of the shirataten l, and is still at a predetermined position. Since the platen 1 can be guided and set reliably until the recording paper P is set, and the rotation of the platen 1 does not stop while the recording paper P is being set, there are advantages such as being able to shorten the setting time. Furthermore, since the passet roller 25 only rotates on the outer peripheral surface of the 70 latin 1, there is an advantage that no impact noise is generated.

The first embodiment has a structure in which recording paper P of normal thickness is set, but a structure in which, for example, a thick recording paper P' of 9 or more is set in the ream 1135 will be described.

6 and 7(a) and 7(b) are right side views showing other embodiments of the present invention, and FIG. 8 is a sectional view of the passet roller. The explanation will be given below according to the same figure.

・Vapor guide arranged inside the gusset lever 23,
38a is a cam portion forming a part of the paper guide 38. The other configurations are the same as in the first embodiment. In FIG. 6, when the paper set lever 23 rotates counterclockwise about the support shaft 2 from the upper left of the platen 1 indicated by the solid line to the lower left indicated by the two-dot chain line, the U-shaped groove of the paper set lever 23 rotates. Slidably inserted and suspended bean-grill set roller shaft 2
4 and the paper set roller 25 inserted into the paper set roller shaft 24 also stop at the position shown by the two-dot chain line.

At this time, a cam portion 38 formed in a part of the vapor guide 38
The paper set roller shaft 24 rides on the point a, and a gear solenoid occurs between the outer peripheral surface of the platen 1 and the vapor set roller 25, as shown in FIG. make it easier to integrate.

FIGS. 7(a) and 7(b) are operation explanatory diagrams illustrating the setting operation of recording paper P' when the set roller 39 shown in FIG. 8 is used.

Figure 8 shows a
4-Passeso troller 3 for being rotatable only in the direction
9 is a sectional view of FIG. In the same figure, vapor set roller 3
Since the one-way clutch 39a is press-fitted into the inside of the roller 9, the vapor set roller 39 can only rotate counterclockwise with respect to the K-passet loan shaft 24, as shown by the arrow in the figure.

do not have.

The operation of FIGS. 7(a) and 7(b) will be explained below.

First, FIG. 7(A) shows that when the paper set lever 23 is rotated counterclockwise as shown by the arrow in the figure, the paper set lever 23 is assembled into the platen set lever 23 via the vane set o-;ly shaft 24. It is shown that the punch set roller 39 also rotates counterclockwise around the passet roller shaft 24 around the outer peripheral surface of the platen l.

FIG. 7(B) shows a state in which the recording paper P' is fed between the outer peripheral surface of the platen 1 and the vapor set roller 39, and is held between the springs 26, as in the first embodiment. Note that when the recording paper P' passes under the vapor set roller 39, even if the recording paper P' hits the surface of the vapor set roller 39, the vapor set roller 39 rotates counterclockwise, so the one-way clutch 39a does not particularly impede the passage of paper. Next, in order to center the recording paper P' in a predetermined position, when the K-passet lever 23 is rotated clockwise together with the platen 1 as shown by the arrow in the figure, the recording paper P' is centered as described in the first embodiment. Set roller 39
The circumferential speed of platen 1 is faster than that of platen 1, so '? -7e The set roller 39 tries to rotate clockwise, but
Since the one-way clutch 39a is incorporated, it does not rotate. As a result, even if the recording paper P' is thick and stiff, the one-way clutch 39a
This has the effect of being forcibly pushed up by the attached vapor set roller 39 to ensure that it comes into close contact with the outer circumferential surface of the platen 1 and being set.

In the first embodiment, the recording head 3 is retracted further to the left outside from the left end of the platen 1.
3.K-Guse...If the recording head 3 does not move around due to the rotation of the roller 25, there is no need to retreat to the left outer side of the platen 1, and the recording head 3 does not need to be moved to the left side of the platen 1.
If the structure is such that the recording head 3 slides and retracts in a direction perpendicular to the platen 1, or if the carriage 4 has a fulcrum and the recording head 3 rotates and retracts with respect to the platen 1, the recording head 3 may be retracted by sliding in a direction perpendicular to the platen 1. There is no need to evacuate.

Furthermore, as shown in FIG. 3, the vapor set roller 25 has been explained as an example in which it is mounted in four parts, but it may also be a single roller of the required length. Although the suspension ring 26 which applies the pressing force for holding the recording paper P at 25 is described as a tension coil spring, it may be replaced with a leaf spring.

Furthermore, in the first embodiment, when the passet roller 25 rotates while holding the recording paper P between the outer circumferential surface of the platen 1, the circumferential speed of the passet roller 25 is one inch lower than the circumferential speed of the platen 1. I explained that they are set relatively fast, but are the circumferential speeds of the two the same? -No e set roller 25 is shown in Fig. 5 (b)
If it is within the range of the pre-testing of the recording paper P at the time of ,
The peripheral speed of the P-i+ set roller 25 may be further increased.

(Effects of the Invention) As explained above, in the first embodiment of the present invention, the front edge of the recording paper is held between the outer circumferential surface of the platen and the passing roller by the spring, and the wave-noxet repeller is moved from the platen. Since it rotates and feeds in the same direction at a slightly faster circumferential speed, it is possible to tightly wrap the recording paper around the outer circumferential surface of the platen, and it is also possible to guide and set it securely at the predetermined position 1. This has the advantage that the recording paper can be set in continuous rotation without stopping the rotation of the platen, so that the setting time can be shortened.

Furthermore, in another embodiment of the present invention, when setting thick recording paper, as explained in FIG. , it has the advantage of making it easier for the recording paper to pass through, and as explained in Figures 7 (a), (b) and 8, a one-way clutch is provided on the peno set roller, so the paper and set roller can easily pass through the recording paper. There is an effect of squeezing up the paper, so there are advantages such as being able to securely set thick recording paper in close contact with the outer circumferential surface of the Silaten.

[Brief explanation of the drawing]

FIG. 1 is a left front perspective view of a conventional embodiment, FIG. 2 is a left side view of FIG. 1, FIG. 3 is a right front perspective view of an embodiment of the present invention, and FIG. 4 is a third view. The right side view of FIG.
6 and 7 (a) and (b) are right side views showing other embodiments of the present invention,
FIG. 8 is a cross-sectional view of the E-passet roller. 1...Platen, 2...Spindle, 13...LF motor, 17...Peno or set motor, 22...<-
/J Kamisetsutoya, 23...Ae -iJ? Set lever, 24... Hard-noise set roller shaft, 25... Beno set roller, 26... Spring, 35...
Detector, 36... Paper leading edge detector, s s a ・-
Cam part, 39a... one-way clutch.

Claims (2)

[Claims] (1) It has a platen that rotates around a support shaft driven by a drive source and feeds recording paper by wrapping it around its outer circumferential surface, and a recording head that is disposed opposite to the platen, and between the two A printer that forms a recorded image on recording paper passing through the platen, a detector that detects that the recording paper is supplied to the platen, a drive source that is activated by a signal from the detector, and the drive source. The platen is rotatable in forward and reverse directions around the platen support shaft, and when the leading edge of the recording paper is detected by the detector, the platen is rotated from the first stop position in the opposite direction to the traveling direction of the recording paper. a rotating member that rotates in a direction and waits to stop at a predetermined second stop position; a roller attached to the rotating member and arranged to press the outer circumferential surface of the platen; and a roller that presses the outer circumferential surface of the platen. and a pressing means for pressing the recording paper, and the first chamber rotates in the same direction as the platen while holding the recording paper in the same direction after the leading edge of the recording paper is clamped on the outer peripheral surface of the platen. printer. (2) The printer according to claim 1, wherein the suppressing means is a spring member.