JPH0462270B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a printing device equipped with an automatic opening/closing mechanism for a paper holding member when replacing printing paper in the printing device.

<Prior art> In general, a paper holding member installed in a printing device presses the printing paper against the printing surface of the platen, prevents the printing paper from rising above the printing surface of the platen during printing, and keeps the printing paper from touching the tip of the printing head. This is necessary for beautiful printing by always maintaining an appropriate distance between the printing paper and the printing paper.

On the other hand, when replacing the printing paper after desired printing is completed, the paper holding member is moved from the first position where the printing paper is pressed to the second position where the printing paper is released from the printing surface of the platen. There is a need.

In conventional printing devices, the opening/closing operation of the paper holding member is generally performed by a solenoid or the like.

Further, for example, in Japanese Utility Model Application Publication No. 59-53947, a cam is provided on the shaft of the platen via a clutch mechanism operated by a solenoid, and a support means that supports a pressure roller of a paper pressing member is brought into contact with the cam. An opening/closing mechanism for a paper press member has been proposed in which the press roller is engaged with the paper press member and can be opened and closed using the rotation of the platen.

Further, in Japanese Utility Model Application Publication No. 57-121549, a pair of arms rotatably supporting a pressure roller for printing paper and a pair of arms are arranged along the movement path of the carriage so that the pressure roller can be opened and closed by movement of the carriage. The cam plate is pivoted to rotate together with the cam plate, and by moving the carriage out of the printing area, when a part of the carriage contacts the cam plate, the rotation of the cam plate moves the pressure roller away from the platen. A new printer has been proposed.

<Problems to be Solved by the Invention> In the case of a printing device equipped with such a paper holding member constructed from a conventional solenoid or the like, the parts cost of the opening/closing mechanism of the paper holding member is high;
As a result, there was a drawback that the cost of the printing apparatus as a whole increased.

In addition, those that utilize the driving force of the platen to open and close the pressure roller also use a solenoid to operate the clutch mechanism, resulting in high parts costs, similar to the above-mentioned printing apparatus. Furthermore, in the case where the pressure roller is opened and closed by moving the carriage, if the printing paper carriage does not stop outside the printing area, the pressure roller cannot be kept away from the platen, so while the printing paper is being inserted, the pressure roller cannot be kept away from the platen. , the carriage remains stopped outside the print area. Therefore, since there is no carriage at a position facing the platen while the printing paper is being inserted, the inserted printing paper may fall toward the carriage and may not be inserted reliably between the platen and the pressure roller.

<Object of the Invention> The object of the present invention is to solve the above-mentioned conventional drawbacks, and to provide a paper presser with a simple structure that uses the driving force of a paper feed motor to open and close a paper presser member, and which is low in cost. It is an object of the present invention to provide a printing device that is equipped with an automatic opening/closing mechanism for members and that can reliably guide the insertion of printing paper using a carriage.

<Means for Solving the Problems> The present invention has been made to solve the above-mentioned drawbacks, and includes a printing paper that is rotatably supported by a main body about a rotation axis parallel to the direction of movement of the printing mechanism, and that print paper is a first cartridge having a platen to be mounted; a carriage supporting the printing mechanism so as to face the platen and to be movable along the axial direction of the platen; a paper presser member rotatably supported between a position and a second position where the pressure roller is separated from the platen; and a paper feeder that feeds the printing paper between the platen and the paper presser member. a separating member that moves the paper holding member to the second position and holds the paper holding member at the second position by a transmitted driving force; and a separation member that moves the carriage out of the printing range. a transmission member that transmits the driving force of the paper feed motor to the separation member for a predetermined period as the printing paper is inserted; A carriage control means for moving the carriage into the printing range after transmitting the information to the separating member via the member and guiding the printing paper between the platen and the paper holding member by the carriage. It is a printing device that

<Function> The present invention is constructed as described above, and the carriage control means moves the carriage out of the printing range and transmits the driving force of the paper feed motor to the separation member for a predetermined period of time via the transmission member. do.
This rotation of the separating member causes the paper pressing member to follow, and the paper pressing member is rotated from a first position where the pressure roller and the platen are in contact with each other to a second position where the pressure roller is separated from the platen.

Then, by moving the carriage into the printing range, the inserted printing paper is fed by the paper feed motor and guided between the platen and the paper pressing member by the carriage. Furthermore, due to the rotation of the separating member, the paper pressing member returns to the first position and presses the printing paper against the platen.

<Example> An example of the present invention will be described below with reference to FIGS. 1 to 4.

As shown in the figure, a platen 2 is rotatably supported between the side frames 1 on both sides of the printing device, and a carriage 6 carrying a printing head 7 is guided by a guide bar 5 so that the printing head 7 It is reciprocated to move along the printing surface of the platen 2 on which the printing paper 8 is attached. And the carriage 6
A paper guide 45 is vertically provided along the platen 2.

A guide plate 3 having a curved cross section is disposed below the platen 2, and a plurality of driven rollers 4 supported by the guide plate 3 are pressed onto the platen 2 and cooperate with the platen 2. It is formed to feed printing paper 8. Further, an intermediate gear 11b is meshed with a driven gear 12 coaxially fixed to the platen 2,
It meshes with a small gear 10 of the paper feed motor 9 via an intermediate gear 11a coaxially formed integrally with this intermediate gear 11b.

The paper holding member 13 is rotatable on both sides of the platen 2 in the length direction about the shaft 16 between the solid line position and the two-dot chain line position in FIG.
It is composed of a pair of paper bails 14 supported by a pair of left and right side frames 1, and a plurality of pressure rollers 15 supported by roller support portions 14b of the paper bails 14. The paper veil 14 is provided with a driven convex portion 14a at its lower part on the side closer to the platen 2 (on the left side in FIG. 1), and a pressure roller 15 is attached to the platen 2 by a spring (not shown). It is urged to press the paper 8.

The drive body 17 has a transmission gear 20 which is a transmission member.
The clutch portion 23 and a spacing cam 19 serving as a spacing member are integrally formed coaxially and rotatably supported on the side frame 1 by a shaft 18. Further, the driving body 17 is biased counterclockwise in FIG. 1 by a tension spring 22 hooked between the pin 21 and the side frame 1. Further, an engaging convex portion 24 is protruded from one side, and an engaging portion 28 of an actuation lever 26, which will be described later, is provided.
The driving body 17 is prevented from rotating due to the biasing force of the tension spring 22.

The transmission gear 20 is a toothless gear formed on the periphery of the drive body 17, and is disposed so as to be able to mesh with the intermediate gear 11a.

The clutch portion 23 has a drive body 17 that is connected to the engagement convex portion 24.
This is a toothless portion of the transmission gear 20 that is formed so as to interrupt engagement between the intermediate gear 11a and the transmission gear 20 when the transmission gear 20 is rotated by engagement with the engagement portion 28. Then, when the above engagement is released,
The driving body 17 rotates counterclockwise in FIG. 1 due to the biasing force of the tension spring 22, and the rotating intermediate gear 1
A transmission gear 20 meshes with 1a to transmit the driving force of the paper feed motor 9.

The separation cam 19 is a substantially fan-shaped cam that protrudes from the other side of the drive body 17, and when the drive body 17 is stopped by the engagement between the engagement convex portion 24 and the engagement portion 28, The surface of the separation cam 19 faces the driven protrusion 14a of the paper veil 14 and is in a non-contact state.
When the separation cam 19 rotates, the arcuate portion 19a of the cam comes into contact with the driven protrusion 14a, and when the separation cam 19 rotates once, it comes out of contact with the driven protrusion 14a. There is. In the non-contact state, the paper presser member 13 is located at the first position shown by the solid line in FIG. It is designed to be rotated to an intermediate position.

The arm-shaped operating lever 26 is rotatably supported by a support fitting 33 fixed to the side frame 1 by a shaft 32.

The first arm 27 is provided with an engaging portion 28 at its tip, and the operating lever 26 connects one end to the support fitting 3.
When the engaging portion 28 is pulled by the spring 34 hooked on the side frame 1 to the solid line position shown in FIG.
6 and is formed so as to abut and engage with the engagement protrusion 24 of the drive body 17. Also, the second arm 29
A locking portion 31 provided at the tip of the lever 26 is locked to the side frame 1 to restrict rotation of the operating lever 26. Furthermore, the second arm 29 has a protrusion 30 extending therethrough, and when the carriage 6 moves fully to the left in FIG. It is formed so that it can be rotated to the position shown by the chain line. Furthermore, when printing,
Even if the printable area (margin position) by the print head 7 is set to the maximum print digit and printing is performed, the protrusion 30 of the operating lever 26 and the carriage 6
It is designed so that it does not come into contact with the

The carriage control means (not shown) is a well-known
It is composed of a CPU, and receives a paper feed signal from a paper insertion key (not shown), and as shown in FIGS.
It is configured to control the movement of the paper feed motor 9, drive control of the paper feed motor 9, etc.

Next, the paper insertion operation will be explained.

First, when you operate the paper insertion key (not shown),
The carriage control means moves the carriage 6 at an arbitrary position S to the left and stops at a hooking position C where one edge of the carriage 6 presses the protrusion 30 of the operating lever 26. Then, the operating lever 26 is rotated to the position shown by the two-dot chain line in FIG.
4 is released. Along with this, the driver 1
7 is pulled counterclockwise in FIG. 1 by the tension spring 22, the transmission gear 20 meshes with the intermediate gear 11a, and the rotation of the paper feed motor 9 can be transmitted to the drive body 17.

Next, the carriage 6 moves into the printing range on the right side of FIG. 3 and stops at the center position B of the margin. As the carriage 6 moves, the operating lever 26
is returned to the solid line position in FIG. 2 by the spring 34.
At this time, the engagement between the engagement portion 28 of the actuation lever 26 and the engagement convex portion 24 of the driver 17 remains disengaged. The carriage 6 is moved to the margin center position B by bringing the actuating lever 26 into contact with the driving body 17 again, and by guiding the center of the printing paper 8 by a paper guide 45 provided on the carriage 6 and printing. This is to make it easier for the entire paper 8 to follow the outer peripheral surface of the platen 2.

At this time, the paper feed motor 9 is rotated under the control of the carriage control means, and the intermediate gears 11a,
11b is driven clockwise in FIG. 1, the driven gear 12 and platen 2 are driven counterclockwise in FIG.
4 and is similarly fed counterclockwise along the outer peripheral surface of the platen 2. At the same time, the driver 17 is also rotated counterclockwise.

The separation cam 19 cooperates with the rotation of the driving body 17.
The circular arc portion 19a comes into contact with the driven convex portion 14a of the paper veil 14, and the paper veil 14 is gradually rotated to the right in FIG. The roller 15 also moves to the right. The paper veil 14 then reaches the second position shown by the two-dot chain line in FIG.

When the drive body 17 further rotates in parallel with the rotation of the platen 2 and the meshing position of the intermediate gear 11a and the transmission gear 20 reaches the clutch portion 23, the intermediate gear 1
1a and the transmission 20 are released, and the drive body 17
is rotated counterclockwise in FIG. 1 by the biasing force of the tension spring 22. Then, the engaging convex portion 24 abuts and engages with the engaging portion 28 of the actuating lever 26 located at the solid line position in FIG. be done.

At this time, the leading edge of the printing paper 8 has already passed between the platen 2 and the pressure roller 15 of the paper veil 14.

At the same time as the drive body 17 is rotated by the biasing force of the tension spring 22, the circular arc portion 19a of the separation cam 19 and the driven convex portion 14a come into a non-contact state, the paper bail 14 returns to the first position, and the platen 2 The pressure roller 15 presses the printing paper 8 that has been fed upward. The paper feed motor 9 is controlled by the carriage control means to prevent rotation.

When the insertion of the printing paper 8 is completed, the carriage 6 is moved to the initial printing position A by the carriage control means.

In this way, desired printing is performed on the attached printing paper 8 using the print signal. At this time, the paper veil 14 is connected to the separation cam 19 and the driven protrusion 14a.
Since these are in a non-contact state, the printing paper 8 is biased and held at the first position shown by the solid line in FIG.

Next, the third section regarding the control of the carriage control means will be explained.
This will be explained with reference to the figures and FIG.

First, when the paper insertion key is operated, a paper feed signal is sent to the carriage control means, thereby moving the carriage 6 from an arbitrary position S to the hooking position C, as shown in step 41 of FIG. do. As a result, the engagement between the engagement portion 28 of the actuating lever 26 and the engagement portion 24 of the driver 17 is released as described above. Then, as shown in step 42,
The carriage 6 moves to the pine surge center position B.

Then, as shown in step 43, print paper 8
The paper feed motor 9 (platen 2) rotates until it reaches the insertion completion position. As a result, the insertion of the printing paper 8 and the automatic opening and closing of the paper veil 14 as described above are performed.

Finally, the carriage 6 is moved to the initial printing position A as shown in step 44.

<Effects of the Invention> As explained above, the printing device of the present invention has a simple configuration and utilizes the driving force of the paper feed motor to open and close the paper presser member, resulting in a low-cost paper presser member. In addition to having an automatic opening/closing mechanism, when inserting printing paper, the carriage can reliably guide the printing paper between the platen and the paper holding member, which has a great effect.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of the paper feeding device portion of a printing device according to an embodiment of the present invention, FIG. 2 is a plan sectional view of the main parts, FIG. 3 is a diagram explaining the operation sequence, and FIG. 4 is a flowchart. It is. 2...Platen, 8...Print paper, 9...Paper feed motor, 14...Paper veil, 15...Pressure roller, 19...Separation cam, 20...Transmission gear,
23...clutch portion, 26...operating lever.

Claims (1)

[Scope of Claims] 1. A platen that is rotatably supported by a main body about a rotation axis parallel to the moving direction of the printing mechanism and to which printing paper is attached; a carriage supported movably along a direction; and a pressure roller, the carriage rotating between a first position in which the pressure roller contacts the platen and a second position in which the pressure roller is spaced from the platen. In a printing device comprising a movably supported paper holding member and a paper feed motor that feeds the printing paper between the platen and the paper holding member, the paper holding member is moved by a transmitted driving force. a separating member for moving the paper holding member to the second position and holding the paper pressing member at the second position; and transmitting the driving force of the paper feed motor to the separating member for a predetermined period as the carriage moves out of the printing range. a transmission member, and when the printing paper is inserted, the carriage is moved out of the printing range and the driving force of the paper feed motor is transmitted to the separation member via the transmission member, and then the carriage is moved into the printing range. A printing device comprising: carriage control means for moving and guiding printing paper between a platen and a paper holding member by means of a carriage.