JPS63153170A - Automatic paper setting mechanism for printer - Google Patents

Abstract

PURPOSE:To enable automatic setting of a paper to a platen, by providing a bail cam for moving a bail arm against an energizing means, and a clutch mechanism for and breaking the transmission of the rotation of a motor to the bail cam. CONSTITUTION:At the time of inserting a piper, an automatic setting signal is inputted, and a spacing motor 19 is driven to move a carriage 15 to a central position in the width direction of a paper 22. The rotation of the spacing motor 19 is transmitted to a bail cam 35a through a clutch mechanism A. The bail cam 35a is rotated to rotate a bail arm 37 against an energizing force of an energizing spring 42, thereby separating bail rollers 41 ... from a platen 10. The paper 22 is inserted from the rear side of the platen 10, is clamped between the platen 10 and pressure rollers 45, 45 by appropriately rotating the platen 10, and is wrapped around the platen 10 by guiding the paper by a deflector 44. The spacing motor 19 is reversely driven to return the carriage 15 from the center of the paper 22 to a left end initial position for starting printing.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention is applicable to printers such as inkjet printers, and other printing devices such as plotters and typewriters. More specifically, the present invention relates to an automatic paper setting mechanism for winding paper around a platen, pressing it with a bail roller, and automatically setting the paper on the platen in a serial printing apparatus among such printing apparatuses.

BACKGROUND ART Conventionally, when setting paper on a platen, a bail arm is manually operated to press the paper wrapped around the platen with a bail roller. However, with this method, the paper cannot be set automatically, so it is complicated and there are problems in that an automatic paper feeder cannot be used.

For example, as shown in Fig. 4, the bail arm (2) is normally pulled by the tension spring (1) to press the bail roller (3) against the platen (4), and the plunger (5) is operated when inserting paper. However, there is one in which the bail arm (2) is moved counterclockwise in the figure about the mounting shaft (6) against the biasing force of the tension spring (1). Then, insert the paper (7), guide it with the deflector (8) and wrap it around the platen (4), and then use the plunger (
5), press the bail roller (3) against the platen (4) again to hold down the paper (7), and then press the paper (7).
) was automatically set on the platen (4). However, with this method, when the plunger (5) stops operating, the bail roller (3) presses against the platen (4) forcefully due to the biasing force of the tension spring (1), which causes an impact sound and noise. There was a problem that caused this.

Purpose Therefore, the purpose of the present invention is to solve such problems in a serial printing device and to provide a serial printing device that does not generate noise.
The purpose is to automatically set paper on a platen.

Structure Therefore, the paper automatic setting mechanism according to the present invention is configured to include a space motor (19), as shown in the illustrated embodiment, for example.
The carriage (15) is moved along the platen (10) by driving the carriage (15) along the platen (10).
), the bail roller (41)... rotatably supports the bail roller (41) and presses the bail roller (41) against the platen (10), and rotates between a first position and a second position where the pressing is released. a possible bail arm (37), a biasing means, such as a biasing spring (42), for biasing the bail arm (37) into said first position, and a biasing means for biasing said bail arm (37) against said biasing means. Arm (37)
a bail cam (35a) that moves the bail cam to the second position;
and a clutch device provided between the bail cam (35a) and the space motor (19) to appropriately transmit the rotation of the motor (19) to the oil mud bail cam (35a) or interrupt the transmission. 11(A).

Then, using the driving force of the space motor (19), the driving force is transmitted to the bail arm (37) via the bail cam (35a), and the bail arm (37) is rotated to rotate the platen (10). ) against bail roller (41)...
It is used to press or release the press.

The present invention will be described specifically and in detail according to an embodiment shown in the following five drawings.

FIG. 3 is a schematic plan view of the internal mechanism of a serial printing device equipped with an automatic sheet setting mechanism according to the present invention. Reference numeral (10) in the figure is a round platen, and both ends are supported by left and right side frames (11) and (12), respectively. A support shaft (13) and a rear steering wheel (14) are also connected to these side frames (11) and (12), and are parallel to the platen (10). Their support shaft (I3) and rear steering wheel (14) are attached to the carriage (
15). A timing belt (16) is attached to the carriage (15). Timing belt (1)
6) is an endless loop between the driving pulley (17) and the driven pulley (18), and the driving pulley (17) is attached to the motor shaft (20) of the space motor (19).

The space motor (19) is attached to the right side frame (12).
). The drive pulley (17) is rotated by the drive of the motor (19), the timing belt (16) is moved, and the carriage (15) is guided by the support shaft (13) to reciprocate along the platen (lO). do. At this time, the print head (21) mounted on the carriage (15)
The set paper (22) wraps around the platen (10).
Printing is carried out sequentially.

FIGS. 1 and 2 show the automatic paper setting mechanism provided in the serial printing machine shown in FIG. 16) and attach the drive pulley (17).

There is a clutch mechanism (A) on the outside of the drive pulley (17).
will be established. In other words, as shown in Figure 1, the drive pulley (
A truncated conical recess is provided on the side surface of 17), a conical tooth portion (17a) is formed on the inner periphery of the truncated conical recess, and a flat abutment portion (17b) is formed at the bottom.

The conical tooth part (17a) is provided with triangular teeth whose helix angle is zero in the pitch cone, and the flat abutting part (17a) is provided with triangular teeth whose helix angle is zero.
7b) with one end of the coil spring (24) pressed against it. The coil spring (24) is arranged around the outer periphery of the motor shaft (20),
The other end is inserted into the side recess (25a) of the slide gear (25). The slide gear (25) is attached to the motor shaft (20) so as to be rotatable and slidable in the axial direction, and is prevented from being removed by a ring (26) attached to the motor shaft (20). Then, the outer periphery of the side surface on the negative side, that is, the side recess (
A conical tooth portion (25b) is formed on the outer periphery of the side surface of the 25a) side, and a cylindrical tooth portion (25c) is formed on the entire outer periphery. The operating rod (28) of the magnet (27) comes into contact with the other side of the slide gear (25). Although not shown, the magnet (27) is fixed on the right side frame (12). do. And, the tension spring (2
At step 9), give the operating rod (28) the ability to rotate clockwise in FIG. Apply and stop. However, the magnet (
27) is turned on, it attracts the 9 operating rod (28), rotates the operating rod (28) counterclockwise against the tension spring (29), and moves the slide gear (25) to the coil spring (24). The triangular tooth of the conical tooth portion (25b) engages with the conical tooth portion (17a) of the drive pulley (17). Then, when the magnet (27) is turned off, the operating rod (28) returns to the position where it hits the stopper (31) by the force of the tension spring (29), and the slide gear (25) is moved by the biasing force of the coil spring (24). is the motor shaft (
20), and the slide gear (25) and drive pulley (17) are disengaged from each other.

Now, the teeth of the crown gear (33) are always engaged with the cylindrical tooth portion (25c) of the slide gear (25).
is, for example, a sheet metal layer, and is rotatably attached to the fixed shaft (34). The fixed shaft (34) has its base end fixed on the right side frame (12), and has a cam gear (35) attached thereto that rotates together with the crown gear (33). Then, they are prevented from being removed by a ring (36) attached to the tip of the fixed shaft (34). Therefore, a clutch mechanism (A) is provided between the space motor (19) and the cam gear (35), and the clutch mechanism (A) appropriately transmits the rotation of the space motor (19) to the cam gear (35). This means that the transmission can be blocked.

By the way, the cam gear (35) is the bail cam (35a)
The lower end of the bail arm (37) is brought into contact with the outer periphery of the bail cam (35a). The bail arm (37) is rotatable about the support shaft (38). The support shaft (38) is supported by the right side frame (12), and the bail arm (37) is attached to the ring (39).
) to stop extraction. Although not shown, the bail arm (
37), another bail arm is rotatably attached to the left side frame (11) side. A bail shaft (40) is provided between the upper ends of both bail arms, and a plurality of bail rollers (41) are rotatably mounted on the bail shaft (40) at predetermined intervals. . As shown in FIG. 2, one end of the biasing spring (42) is applied to give the bail arm (37) the ability to rotate clockwise in FIG. 2 about the support shaft (38), and the bail roller ( 41) Press against the platen (10). Although not shown, the biasing spring (
42) The other end is fixed to a fixing pin placed on the right side frame (12), for example.

In addition, the cylinder number (44) in Figure 2 is a deflector that guides the inserted paper, and (45) and (45) are the platen (10
) is a pressure roller that conveys the paper (22) by sandwiching it between them.

The automatic sheet setting mechanism according to the present invention is configured, for example, as described above. Therefore, when paper is inserted, for example, if the paper set switch provided on the operation panel of this printing device is pressed or an auto-set signal is input from outside, the space motor (19) is driven and the carriage (
15) to the center position in the width direction of the paper (22) shown in FIG. At this time, the magnet (27) is turned on to connect the clutch mechanism (A), and the rotation of the space motor (19) at this time is transmitted to the bail cam (35a) via the clutch mechanism (A). Then, the bail cam (35a) is rotated and the biasing spring (42)
The bail arm (37) is rotated against the urging force of the bail roller (41) to separate it from the platen (10). Then, as shown in Figure 2, place the platen (10
), insert the paper (22) from the rear of the platen (1
0) is rotated and sandwiched between the pressure rollers (45) and (45), and guided by the deflector (44), the paper (22) is wound around the platen (10). Thereafter, the space motor (19) is driven in reverse to return the carriage (15) to the initial position at the left end in FIG. 3 in order to start printing from the center position in the width direction of the paper (22). At this time, turn on the magnet (27) again and connect the clutch mechanism (A).

The space motor (19) is connected to the clutch mechanism (A).
) is transmitted to the bail cam (35a). Then, the bail cam (35a) is rotated in the opposite direction, and the bail arm (37) is rotated following the cam surface based on the biasing force of the biasing spring (42), and the bail roller (35a) is rotated again. 41) Press against the platen (10).

At this time, due to the cam shape of the bail cam (35a),
Bail roller (41) against platen (10)...
... so that they come in gentle contact with each other.

Therefore, according to the present invention, since the bail arm is rotated using the bail cam, it is possible to press the bail roller against the platen and release the pressing smoothly, and the durability is improved. This has the effect of improving noise and preventing the generation of noise.

Further, since a conventional space motor is used to rotate the bail cam without providing a separate drive member, the number of parts can be reduced.

In addition, the carriage is centered when paper is inserted, and at this time the driving force of the space motor is transmitted to the bail cam to release the bail roller from pressing against the platen. Similarly, when the carriage is returned to the initial position after paper is inserted, this By transmitting the driving force of the space motor to the bail cam and pressing the bail roller against the platen again, there is no wasted movement and paper can be set reliably without significant time loss. becomes.

Therefore, in the printing device, it is possible to automatically set paper on the platen, and it is possible to easily use an automatic paper feeder.

[Brief explanation of the drawing]

1 and 2 show an automatic paper setting mechanism which is an embodiment of the present invention, and FIG. 1 is a schematic plan view of the mechanism;
FIG. 2 is a schematic side view thereof. FIG. 3 is a schematic plan view of the printing device equipped with the automatic sheet setting mechanism. FIG. 4 is a side view of a main part of a printing device showing an example of a conventional paper automatic setting mechanism. (10)...Platen (15)...Carriage (19)...
・・・・・・Space motor (21)・・・・・・・・・
・Print head (22)...Paper (35a)...Bail cam (37)...Bail arm (41)...
・・・・・・Bailrolla (42)・・・・・・・・・
・Biasing spring (A)・・・・・・・・・Clutch mechanism Fig. 2

Claims (1)

[Claims] 1. A serial printing device that sequentially prints on sheets of paper set on the platen using a print head mounted on the carriage while driving a space motor to reciprocate a carriage along the platen, a bail arm that rotatably supports a bail roller and is rotatable between a first position in which the bail roller is pressed against a platen and a second position in which the pressing is released; a bail cam for moving the bail arm to the second position against the urging means; and a bail cam provided between the bail cam and the space motor. An automatic paper setting mechanism for a printing device, comprising a clutch mechanism that appropriately transmits the rotation of the motor to the bail cam or interrupts the transmission. 2. The clutch mechanism includes a slide gear that is freely movable in the axial direction, and the slide gear can be moved appropriately against a biasing force to transmit the rotation of the space motor to the bail cam via the gear. An automatic sheet setting mechanism for a printing device according to claim 1, comprising a magnet. 3. When paper is inserted, the space motor is driven to move the carriage in the printing direction, and at this time, the clutch mechanism is connected to transmit the rotation of the space motor to the bail cam, and the bail cam drives the carriage. The automatic paper setting mechanism of the printing device according to claim 1, wherein the bail arm is moved to the second position. 4. After inserting the paper, drive the space motor to return the carriage to the initial position, connect the clutch mechanism at this time to transmit the rotation of the space motor to the bail cam, and use the bail cam to move the carriage back to the initial position. The automatic sheet setting mechanism of the printing device according to claim 2, wherein the bail arm is moved slowly to the first position.