JPS61209181A - Paper guide mechanism of printing apparatus - Google Patents

Abstract

PURPOSE:To enable the accurate setting of paper and to facilitate the taking-out of printing paper, by arranging the guide plate for guiding lower supply paper, by arranging the guide plate for guiding lower supply paper and the guide plate for guiding upper supply paper toward the same side of the same paper press roller and making the guide plate for guiding the lower supply paper openable and closable. CONSTITUTION:When printing papers 70, 73 are supplied from the upper part of an apparatus main body 10, said papers 70, 73 are guided by guide plates 25, 74, 79, 84 to be guided between a platen 24 and a paper press roller 41 and wound around the platen 24 through the nip therebetween to be set to a paper feed possible state. When printing paper 69 is supplied from the lower part of the apparatus main body 10, the paper is guided by separate guide plates 31, 37, 75, 84 to be guided between the platen 24 and the press roller 41 and wound around the platen 24 through the nip therebetween to be set to a paper feed possible state. According to necessity, when the platen 24 is detached and revolved by a bent projection 34, the guide plate 31 can be opened. By this mechanism, the taking-out of the printing paper can be performed in an extremely easy manner when the jamming of the paper is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention can be applied to printing devices such as digital printers, wire dot printers, thermal printers, and thermal transfer printers that can supply printing paper from both above and below the main body. Specifically, the present invention relates to a paper guide mechanism that guides printing paper to a platen in such a printing device.

Conventionally, in most printing devices, printing paper is supplied from above the main body, guided by a guide plate, and set on a platen. However, in printing devices that only feed paper from above the main body.

1) Automatic paper feeder, home tractor,
It is inconvenient to attach a letter guide, etc. because it has to be removed; 2) If a large and heavy automatic paper feeder is attached to the main body, it is unstable and looks bad; is troublesome.

There were problems such as.

Therefore, among conventional printing apparatuses, there is a wire dot printer that can supply printing paper from both the upper and lower parts of the main body, as shown in FIG.

In FIG. 15, reference numeral (1) is the main body of the printer, and (2) is an automatic paper feeder, as shown in the figure.
2) The printer main body (1) is placed on top. The printer body (1) is equipped with a platen (3).
3), a guide plate (4) is installed along the outer periphery with a slight gap therebetween. The paper fed from above the printer main body (1) in the direction of arrow (a) in the figure is guided to the platen (3). Reference numbers (5) and (5) in the figure hold the paper and feed the paper. This is a paper press roller that is pressed against the platen (3).

On the other hand, the front end of a guide plate (6) made of Mylar paper or the like is pressed against the front side (left side in the figure) of the platen (3).

The base end of the guide plate (6) is attached to the upper end of the guide plate (7). The guide plate (7) stands up from below with a gap slightly larger than the paper thickness between it and the guide plate (8). And those pair of guide plates (7) and (8
) guides the paper fed from the automatic paper feeder (2) in the direction of arrow (b) in the figure to the platen (3).

When setting the printing paper from the automatic paper feeder (2) onto the platen (3), the amount of rotation of the paper feed roller in the automatic paper feeder (2) is controlled to change the amount of paper fed out. Then, the paper was set at an appropriate position with respect to the platen (3).

However, the amount of paper fed from the automatic paper feeder (2) to the printing position (P) is large, and the amount of paper deflection during the process varies depending on the thickness and size of the paper, and furthermore, there are differences in the feeding accuracy of the paper feed roller. Because of this, it was very difficult to set the paper in the correct position. and the tilt of the paper (
The disadvantage was that it was not possible to correct the skew.

Also, since the upper ends of the pair of guide plates (7) and (8) are placed in front of the paper presser roller (5) (on the left side in Figure 1), there is no space below the front side of the platen (3). It was not suitable for printing devices with large print heads, such as printers. It is also conceivable to move the guide plates (7) and (8) rearward in order to secure a large space below the front side of the platen (3).

Then, the paper press roller (5) also moves backward, and the distance between the printing position (P) and the paper press roller (5) increases.
This has the disadvantage that there is a large margin at the bottom of the paper.

Furthermore, in this type of conventional printing device, since the pair of guide plates (7) and (8) are fixed, there is a drawback that it is troublesome to take out the printing paper when a paper feed jam occurs.

Therefore, an object of the present invention is to provide a printing device that can supply printing paper from both above and below the main body, and to place all of the supplied printing paper as close as possible to the printing position (P). It feeds the paper from the feed roller, making it possible to set the paper accurately, and it also allows for a larger space below the front of the platen, making it suitable for printing devices with large print heads such as digital printers, and when a paper feed jam occurs. Another object of the present invention is to provide a paper guide mechanism that facilitates the removal of printing paper.

Therefore, the paper guide mechanism according to the present invention is capable of handling the printing paper (69) from both the upper and lower sides of the apparatus main body (10).
- In a printing device that can supply (70) and (73), guide plates (31), (37), (75), and (84) that guide the downwardly fed paper (69) that is fed from below, Upper feed paper (70) and (73) fed from above
Guide plates (25), (74), (79), (
The guide plates (31) and (84) that guide the downwardly fed paper (69) are openable and closable.

Then, transfer the printing paper ()O) (73) to the main body of the device (10
) When feeding from above, guide plates (25) and (7
4), (79), (84) to guide the platen (24)
and the paper presser roller (41), and wrap it around the platen (24) through the gap and set it so that it can feed one sheet. On the other hand.

When feeding the printing paper (69) from below the main body (10), separate guide plates (31), (37), and (75) are used.
- Guide the paper at (84) and similarly guide it between the platen (24) and the paper presser roller (41), pass through the gap, wrap it around the platen (24), and set it so that the paper can be fed.

The present invention will be described in detail below according to an embodiment shown in one drawing.

FIG. 2 shows a digital serial printer equipped with a paper guide mechanism according to the present invention. In FIG. ) is provided with two cassette insertion ports on the front, as shown in FIG. 3, and paper cassettes (12) and (13) are removably attached to these insertion ports, respectively. Further, the automatic paper feeder (11) has a print paper delivery port (14) on the top surface;
4) upward from both ends of the support frames (15) and (16).
) and pass the feeding roller shafts (17) and (18) between the supporting frames (15) and (16), respectively. are also provided with recesses (19), respectively.In these recesses (19), feet (
20)..., and place the printer main body (lO) on the automatic paper feeder (11) as shown in FIG. At this time, inside the printer body (10) there is a support frame (
15), (16) and feed roller shaft (17), (
18) enters.

Then, the printing paper in the above-mentioned cassettes (12) and (13) is sent out from the delivery port (14) by a delivery roller or the like, and can be automatically supplied to the printer main body (10).

The printer main body (10) is provided with side plates (21) and (22) on the left and right as shown in FIG.
(up) The platen (24) is removably hung between the side plates (21) and (22) as is known. It can be rotated by a space motor (not shown).

Now, as can be seen from FIG. 1, a guide plate (25) is arranged around the outer periphery of the platen (24) from the rear to the bottom with a slight gap between the platen (24) and the platen (24).

The guide plate (25) is curved into a cylindrical shape as shown in FIG. 5, and has a mounting bent piece (26) and a locking projection piece (27) on the left and right sides, respectively. Then, fold the bent pieces on both sides (26
) and (26) to the left and right side plates (21) and (22), respectively.

The locking protrusions (27) on both sides are hooked onto the upper portions (29) and (29) of the locking stoppers (28) and (28), respectively, to fix the entire structure. As can be seen from FIG. 6, the locking stopper (28) has upper and lower step portions (29) and (30). and.

Insert the protrusion (28a) into the side plate hole and open the rear 1 through hole (32
) and insert the screws (33) into the left and right side plates (21) respectively.
・It is fixed to the corresponding inner surface of (22).

By the way, the upper end of the guide plate (31) rests on the lower portions (30), (30) of the locking stoppers (28), (28).

As shown in FIG. 7, the guide plate (31) is curved upward into a cylindrical shape, and has a knob bending protrusion (34) and an attachment bending piece (35) formed on the left and right sides, respectively.

Then, attach the bent pieces (35) and (35) on both sides to the side plate (21).
)・(22) rotatably attached, bending protrusion (34)
・Tension springs (36) and (36) are installed at the base of (34), respectively.
) at one end. However, the tension spring (36
) and (36) are hooked onto the side plates (21) and (22), and the guide plate (31) is arranged so as to rise from the bottom to the top, and the tip curves toward the front. Both ends are pressed onto the lower portions (30) and (30) of the locking stoppers (28) and (28) as described above. and,
The printing paper supplied from the delivery port (14) of the automatic paper feeder (11) described above is guided to the platen (24).

Opposed to this guide plate (31) is another guide plate (37) that guides the printing paper supplied from the automatic paper feeder (11). As shown in Fig. 8, the guide plate (37) has a flat plate whose upper part is curved in a wave pattern, and a plurality of roller windows (3B) are provided on the curved surface of the guide plate (37) arranged in a straight line. Each has bent pieces (39) and (40) for attachment. As can be seen from Figure 1, these bent pieces (39) and (40)
are fixed to the side plates (21) and (22), respectively, and face the guide plate (31) with a slightly wide gap in the lower part. The guide plate (31) is arranged so that it rises upward from the bottom and gradually narrows the gap with the guide plate (31) at the lower curved surface, and faces the platen (24) at the upper curved surface and its outer periphery. be in line with.

By the way, as you can see from Figures 1 and 4.

One paper presser roller (4) is passed through the aforementioned roller window (38) of the guide plate (37) to the platen (24).
1) Press the paper presser roller (41)
... is attached to a roller shaft (42), and the roller shaft (42) is connected to a pair of rotating levers (43) and (4), respectively.
4) A hook is passed between the tips of the rotating levers (43).
- (44) is inserted into the window hole (45) of the stay plate (23) and rotatably supported by a support shaft (46) passing through the center of each other. The support shaft (46) has both ends attached to each stay plate (
23), supported by the trigger pieces (47) and (48), and
Stop the removal with the ring (49). A tension spring (5) is attached to the other end of each rotating lever (43) and (44).
0)...Hang one end. Tension spring (50)・
...The other end is hooked onto the stay plate (23). Therefore, the rotary levers (43) and (44) are normally given the habit of rotating clockwise in the figure around the support shaft (46), and the paper presser rollers (41) are rotated around the platen ( 24).

A camshaft (51) is arranged below the stay plate (23), and both ends are connected to the side plate (21) via bearings (52).
- Rotatably supported by (22), and E-ring (53) (
53) to stop the extraction. This camshaft (51) is cut out to have a semicircular cross section to form a plurality of cam parts (54). As shown in Fig. 1, the flat parts of the cam parts (54) are opposed to the side surfaces of the respective rotary levers (43) and (44) with a slight gap (p) between them. do. This camshaft (
One end of an arm (56) is attached to a flat part (55) formed at one end of 51) so as to be able to transmit one rotation. At the other end of this arm (56).

Put up the caulking pin (57). Then, this caulking pin (57) is fitted into the elongated hole (59) at the tip of the operating lever (58) and fixed with an E-ring (60). Operation lever (58
)teeth.

Bend it into a crank shape, fit the pin (61) placed on the outside of the right side plate (22) into the corner hole, and then insert the E-ring (
Stop at 62). The operating lever (58) can be rotated about the pin (61) by holding the knob (63) at the upper end.

Now, as shown by the two-dot chain line in FIG. 19, the printer main body (10) is provided with a type wheel (64) mounted on a carriage (not shown), and the type wheel (64) is driven by a selection motor (65). ) to enable rotation. Then, rotate the type wheel (64) to obtain the desired type (65).
) and position it to the print position. Then, the selected type (65) is struck with a printing hammer (66) to print on the paper set on the platen (24).

As can be seen from Figures 1 and 4, the stay plate (
23), a paper sensor (6B) is attached via a bracket (67).

The illustrated digital serial printer is configured as described above. Next, a case will be described in which printing paper is supplied to this digital serial printer.

First, when automatically feeding print paper using the automatic paper feeder (11), the print paper (69) sent out from the feed opening (14) is moved by a pair of guide plates (31) and (37). invite. Then, it is introduced from below the printer main body (10) between the platen (24) and the paper press roller (41), and is applied between them to stop the feeding of the leading edge of the paper (69). Even after the feeding of the leading edge of the paper (69) is stopped, the feeding roller shafts (17) and (1
8) continues to feed out the printing paper (69), and the paper (69) is passed between the pair of guide plates (31) and (37).
) to give some degree of deflection. After confirming the presence of the paper (69) with the paper sensor (68), the platen (24) is rotated in response to a command from the host, and the paper (69) is rotated in response to a command from the host.
69) is wound between the paper presser roller (41) and fed by a certain amount.

Set the winding on the platen (24). After that, printing is performed on the paper (69).

Next, when manually setting cut sheets from above the printer main body (10), hold the knob (63) and tilt the operating lever (58) toward you (counterclockwise in Fig. 1). ) rotates clockwise in FIG. 1 around the camshaft (51).

Then, the cam portion (54) pushes the side surface of the corresponding rotating lever (43) and (44), and the rotating lever
(43) and (44) are rotated counterclockwise in FIG. 1 about the support shaft (46) against the tension springs (50).

As can be seen from Fig. 9, the paper presser roller (41)
... is separated from the platen (24) to form a slight gap (q) therebetween. Therefore, as shown in Figure 9, the printing paper (7) is inserted from above the printer main body (10).
0) by hand. Then, the paper (70) is guided by the guide plate (25), passes between the platen (24) and the paper presser roller (41), and then passes between the platen (24) and the paper presser roller (41).
4). Therefore, when the control lever (58) is raised again using the knob (63) and returned to its original position, the arm (56) will move onto the camshaft (
51), the cam portion (54)... is disengaged from the rotation levers (43) and (44), and the first rotation levers (43) and (44) are released from the tension springs. (50
) It rotates clockwise in the diagram with the force of... Then, the paper pressing roller (41) presses down the printing paper (70) with the force of the tension spring (50).
The paper (70) can be set on the platen (24).

Next, when automatically setting the cut paper by hand from above the printer main body (10), press the 11-cut lever (58).
Raise the paper presser roller (41) to the platen (24).
While pressing ..., press the printer body (1) in the same way.
0) Manually feed the printing paper (70) from above. Then, the paper (70) is guided by the guide plate (25) and guided between the platen (24) and the paper press roller (41).

Thereafter, the platen (24) is rotated by pressing a feed button (not shown) or by turning the platen knob (71) shown in FIG. 4 by hand. Then, roll it in between the platen (24) and the paper presser roller (41).

Set the printing paper (70) on the platen (24).

Finally, when setting continuous paper using the home tractor, the home tractor (72) is attached to the printer main body (IO) as shown in FIG. Then, the continuous paper (73) from the home tractor (72) is wound and set on the platen (24) in the same manner as the above-mentioned manual setting or automatic setting of the cut paper. In normal cases, the operation lever (58) is tilted down to release the paper presser roller (41) from the platen (24), and then the home tractor (72) is driven to rotate the platen (24) and press the paper. It is used for sending.

By the way, in the illustrated embodiment, the exterior cover (not shown) is opened, the platen (24) is removed as necessary, and the bent protrusion (3) is removed.
4), the guide plate (31) can be opened as shown by the dashed line in FIG. At this time, when the guide plate (31) is opened to a certain angle or more, the force of the tension springs (36) (36) gives it the opposite rotational behavior in the clockwise direction in the figure, and the bending protrusion (34)・(34)
The tip is placed against the outer case shown by the two-dot chain line in the figure to stop it. Therefore, when a paper jam occurs, the printing paper can be taken out very easily by opening the guide plate (31).

The paper guide mechanism according to the present invention is formed, for example, as described above. Of course, Figures 1 to 10
The present invention is not limited to the above embodiment shown in the figures.

Appropriate changes may be made. For example, guide plates (74) and (75) as shown in FIG. 11 may be used instead of the guide plates (25) and (37) of the above embodiment.

111th! As can be seen from 1, the guide plate (75) is made at almost the same height as the opposing guide plate (31), and similarly, the guide plates (31) and (75) are connected to the automatic paper feeder (
11) to guide the printing paper (69).

On the other hand.

As shown in Fig. 12, the guide plate (74) has a long window (76) in the center, and a plurality of roller windows (77) are opened in parallel with the long window (76). . Then, the paper (69) guided by the pair of guide plates (31) and (75) passes through the long window (76) and is guided between the platen (24) and the paper presser roller (41). Do it like this. Instead of this guide plate (74), for example, a guide plate (74) provided with a window hole (78) as shown in FIG.
9) can also be used. Here, the window hole (78) is the 121st! Long window (76) and roller window ()7) shown in l.
. . . are connected to form one hole. In addition, at both ends of the guide plates (74) and (79), for example, there are bent pieces (80) and (81) for mounting, respectively, as in the conventional case.
and (82) and (83), respectively, and left and right side plates (2
Installation is possible in 1) and (22). Although the upper ends of the guide plate (75) are not shown, they can be attached to the left and right side plates (21) and (22) by appropriate means.

Now, in the example shown in FIGS. 11 to 13, the guide plate (25) and the guide plate (37) shown in FIGS.
). However, instead of the guide plate (37), a guide plate (84) as shown in FIG. 14 is used, which is a combination of the guide plate (25) and the guide plate (31).
A guide piece (85) may be fixed to the guide plate (84) to guide the printing paper (69), (70), and (73).

As shown by the dashed line in Figure 1, the guide plate (84
) can be opened and closed in its entirety.

Yutaka--1 Therefore, according to the paper guide mechanism according to the present invention,
The following effects occur.

l) Since it is possible to feed printing paper from both the bottom and top of the main body of the device, automatic paper feeding and manual paper feeding can be completely separated. There is an advantage that there is no need to attach and detach the automatic paper feeder when handling paper.

2) Since there is no need to mount a heavy and bulky automatic paper feeder on the main body of the apparatus, there is no risk of instability or deterioration of the appearance.

On the other hand, if the main body of the apparatus is placed on the automatic paper feeder, there is an advantage that there is no need to attach or detach the automatic paper feeder.

3) Once the paper from the automatic paper feeder is pressed between the platen and the paper presser roller and stopped, the feeding of the leading edge of the paper is stopped, and then the paper continues to be fed from the automatic paper feeder until 1. A certain amount of deflection is caused in the paper between the pair of guide plates, and the stiffness of the paper is used to firmly feed the paper between the platen and the paper presser roller, so there is no misalignment when feeding the paper from the automatic paper feeder. Even if there is, the deviation can be absorbed near the printing position.

In addition, even if the paper is fed at an angle, the inclination of the paper is corrected by being pressed between the platen and the paper holding roller, so that from now on, an accurate feed amount can be obtained by the amount of rotation of the platen. You can neatly align the leading edge of paper (leading edge registration set). Therefore, there is no misalignment in the paper set, the print quality can be made good, and paper feed jams can be prevented from occurring.

4) Since the lower front side of the platen is wider, it can also be applied to printing devices with large print heads, such as digital serial printers, as in the embodiment.

5) Since the guide plate for guiding the downwardly fed paper can be opened and closed, it is possible to easily take out the paper when a paper feed jam occurs.

[Brief explanation of the drawing]

1 to 10 show an embodiment of the present invention, FIG. 1 is a side view showing a paper guide mechanism in the digital serial printer shown in FIG. 2, and FIG. 2 is a schematic external configuration diagram of the digital serial printer. , FIG. 3 is a perspective view of the automatic paper feeder used in the digital serial printer shown in FIG. 2, FIG. 4 is an exploded perspective view of FIG. 1 with some parts omitted, and FIG. A perspective view of the guide plate of FIG. 6, a perspective view of the locking stopper thereof, FIG. 7, and FIG. 81i! ff is a perspective view of a guide plate for guiding the downwardly fed paper;
The figure is a side view of the paper guide mechanism shown in Figure 1 when the operating lever is rotated and the paper presser roller is pulled away from the platen. Figure 10 is a side view of the paper guide mechanism shown in Figure 2 when the home tractor is attached to the digital serial printer. FIG. No. tig is a mechanism explanatory diagram showing an example in which the guide plate in the embodiment shown in FIGS. 1 to 10 is changed. FIG. 12 is a perspective view of a guide plate used in the mechanism shown in FIG. 11, and FIG. 13 is a perspective view showing a modification thereof. FIG. 14 is a mechanism explanatory diagram showing an example in which the guide plate in the embodiment shown in FIGS. 1 to 10 is further modified. FIG. 15 is a schematic configuration diagram showing a conventional paper guide mechanism in a printing device that supplies paper from both above and below the main body. (10)・・・・・・Device body (24)・・・・・・Platen (25)・(31)・(37)・(74)・(75)・
(79)・(84)・・・・・・Guide plate

Claims (1)

[Claims] In a printing device that can supply printing paper from both above and below the device body, the guide plate that guides the printing paper that is fed from below is the same as the guide plate that guides the printing paper that is fed from above. A paper guide mechanism of a printing device in which the guide plate, which is disposed on the same side as the paper presser roller and which guides the printing paper supplied from below, can be opened and closed.