JPH0692183B2 - Paper transport device for printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a printer device for office automation (OA), and more particularly to a paper feeding means in the printer device for inserting and feeding paper from the front and rear. The present invention relates to a paper transporting device of a printer having a configuration obtained.

(B) Conventional Technology In general, a wire dot type printer apparatus is configured to roll a sheet from a back surface of a printer body around a platen so that a continuous sheet or a single-cut sheet can be used, and perform a predetermined printing by a sheet feeding unit. Is provided on the back surface, and especially for the continuous paper, there is only one set of paper feeding means called a tractor, and accordingly, only one type of continuous paper can be mounted.

Therefore, in Japanese Utility Model Sho 58-2610, two sets of tractors were installed,
A configuration has been proposed in which two types of paper can be loaded.

(C) Problems to be Solved by the Invention In the above-described conventional example, two sets of tractors are provided, and it is possible to insert two sets of paper and print, but as two types of paper, a wide width is provided at the same time. It was very inconvenient because we could not deal with the paper.

In addition, when inserting the paper, the paper must be inserted into the two sets of tractors from the rear side, and thus the efficiency of inserting the paper is poor. Therefore, the present invention provides a novel paper transporting device for a printer that eliminates the above-mentioned drawbacks.

(D) Means for Solving the Problems The present invention is provided with a first transporting unit and a second transporting unit, which are provided at the front and rear portions of the printer body, and which feed continuous paper to the printing unit.
Is provided in the confluence of the transporting means of the printer, the moving path of the cut sheet inserted from the front of the printer body, and the moving path of the continuous paper by the first transferring means, and sends the cut sheet to the printing section. The first pinch roller is provided in a confluence of the moving path of the cut paper inserted from the rear part of the printer body and the moving path of the continuous paper by the second conveying means, and the cut paper is provided in the printing section. A second pinch roller for feeding a sheet, a selection means for selecting one of continuous paper feeding and cut sheet feeding by the first or second conveying means, and either the first or the second by the selecting means. The first and second pinch rollers are switched to the released state in response to the selection of the continuous sheet feeding by the transporting means, and the first sheet is fed in response to the selection of the cut sheet feeding by the selecting means. And the second
And a switching means for switching the pinch roller to a state in which the sheet is conveyed, and either the continuous sheet or the cut sheet can be conveyed from the front portion or the rear portion of the printer body.

(E) Operation In the present invention, regarding the sheet feeding, the sheet conveying means is provided at the front portion and the rear portion, respectively, and the conveying means can be selectively driven and controlled by the switching means provided between these and the driving source.

(F) Embodiments The present invention will be described with reference to the drawings. FIG. 1 is a side view of a main portion of the device of the present invention, and FIG. 2 is an external perspective view showing a sheet conveying device of a printer of the present invention, FIGS. The figure is a cross-sectional side view of the main part of the same device, and FIG. 5 is a perspective view of the main part of the device with the bottom cabinet and top cabinet removed, and FIG. 6 corresponds to each lever position in FIG. FIG. 7 and FIG. 8 are plan views of the main part showing a state in which a continuous sheet and a cut sheet are used, respectively. FIG. 9 is an exploded perspective view of essential parts showing a switching lever and a main gear driven by the operation of the switching lever, and FIG. 10 is a system block diagram of the device of the present invention.

In the drawings, (1) and (2) are a bottom cabinet and a top cabinet that respectively constitute the printer main body,
(3) is a manual knob for rotating the platen, (4) is a tractor switching lever, (5) is a paper insertion port, (6) and (7) are continuous narrow and wide papers, and (8) is a front portion. Tractor mechanism, (9) rear tractor mechanism, (10) platen,
(11) is a bale roller for holding the paper, (12) and (13) are rear pinch rollers, (14) and (15) are front pinch rollers, and (1
6) is a pinch roller holder, (17) is a leaf spring for urging the holder, (18) is a leaf spring fixing bracket, (19) is a paper guide, (20) and (21) are tractor guide shafts,
(22) print head, (23) carriage, (24) guide rail, (25) base plate, (26) paper guide plate, (27) single-cut paper, (28) sprocket,
(29) is a paper feed motor, (30) is a motor pulley,
(31) is a belt, (32) is a platen pulley, (33) (3
4) is a tractor shaft, (35) and (36) are tractor gears, (37) and (38) are idle gears, (39) and (40) are connecting gears, (41) is a side plate, and (42) is a platen shaft. Show.

Next, the operation of the paper transporting device of the printer of the present invention will be described. First, as shown in FIG. 2, a continuous paper (6) having a narrow width is inserted into the insertion opening (5) from the front with respect to the printer body (43). When inserting a wide continuous sheet from the rear while inserting the sheet, one side of the continuous sheet is printed, and the other is placed in a standby state.

In FIG. 2, the switching lever (4) is in the neutral state, and the continuous paper on either side is not conveyed. That is, as shown in FIGS. 1 (a) and 6 (a), the motor (29) rotates when a signal for paper feeding is transmitted, and the platen pulley (32) rotates by the belt (31). However, in this state, both of the connection gears (39) (40) ride on the stepped portions (43) (44) of the switching lever (4), and the platen pulley (3
The platen gear (45) rotates with the rotation of 2),
Connecting gears (39) (40) are idle gears (37)
Since it is not meshed with (38), its rotation is not transmitted and therefore the paper is not conveyed.

Next, as shown in FIGS. 1 (b) and 6 (b), when the switching lever (4) is tilted rearward, that is, backward, it penetrates through the long holes (46) (47) of the switching lever (4). The connected gear shafts (48) (49) are located at the right ends of the elongated holes (46) (47). At this time, as shown in FIG. 9, the tips of the holding pieces (50) (51) of the leaf spring (80) are connected by the tip of the connecting gear (3).
9) (40) are urged to the left in Fig. 9 and the connecting gear (3
9) One of the (40) (40) moves from the step (44) to the bottom (51) as shown in FIGS. 1 (b) and 6 (b), and the connecting gear (40) is Mesh with the idle gear (38),
The rotation of the platen pulley (32) is transmitted from the connection gear (40) to the idle gear (38) and further to the tractor gear (36) to rotate the tractor shaft (34) shown in FIG.
The rear tractor (9) is driven, the continuous paper (7) is printed by the print head (22), and is conveyed in the forward direction by the tractor (9).

In this case, especially when the paper (7) is conveyed, especially the tractor (9).
The paper is fed in a state of being wound around the platen (10) in accordance with the conveyance by the. The operation of the switching lever (4) causes the cam at the lower end of the switching lever (4) as shown in FIG. The rotating arm (53) pressed and urged by the surface (52) rotates clockwise in the drawing, and the hexagonal shaft (54) serving as a supporting shaft of the rotating arm (53) is the same. Since the pinch roller arm (81) attached to the hexagonal shaft (54) rotates from the state shown in FIG. 8 (a) to the state shown in FIG. 7 (a), The leaf spring (17) for urging the holder is pushed down by the urging force and the urging force is removed, so that the pinch roller holder (16) rotates clockwise around the support shaft of the rear pinch roller (12),
As a result, the rear pinch rollers (12) (13) are separated from the platen (10). And continuous paper (7)
Are freely conveyed to the rear pinch rollers (12) (13).

Therefore, as the platen (10) rotates, the rear tractor (9) also rotates and the continuous paper (7) is conveyed in the forward direction,
As the platen (10) rotates, as shown in FIG. 3, the continuous paper (7) is conveyed while being sandwiched between the platen (10) and the bale roller (11) arranged for delivering the paper. To be done.

Further, as described above, when the hexagonal shaft (54) rotates clockwise in response to the operation of the switching lever (4), the pinch rollers (14) (15) cause the pin (56) of the hexagonal shaft (54) to move.
Is configured to press one wall of the elliptical cam (57) to separate it. That is, from the state shown in FIG. 8 (b), the pinch roller (15) provided at the tip of the elliptical cam (57) rotates clockwise and is separated from the pinch roller (14) so that the pinch roller (14) shown in FIG.
The state becomes as shown in.

Next, when the switching lever (4) is tilted forward and set to the state shown in FIG. 1 (C) and FIG. 6 (C), the connection gear (39) causes the platen gear (45) to rotate, contrary to the above description. ) And the idle gear (37), the connection gear (39) and the idle gear (37) rotate as the platen (10) rotates, and the transmission gears (58) (59) (60) ( 61) (62) (63)
Through sprocket gear (64) and tractor gear (3
5) rotates, the continuous paper (6) is sent out by the sprocket (28) and the front tractor (8), and the narrow continuous paper (6) shown in FIG. 1 is guided along the guide plate (26). Be transported.

At this time, the front pinch rollers (14) and (15) are separated from each other as shown in FIG. 7 (b), so that the continuous paper (6) is separated from the front pinch rollers (14) and (15). It is freely guided by the guide plate (26) and conveyed upward in front of the platen (10).

On the other hand, with respect to the cut sheet, in the state shown in FIG. 4 and the above-mentioned FIG. 1 (a), the cut sheet (27) is wound around the platen (10) from the back or the front. First, when inserting the cut sheet paper (27) from the rear, insert the cut sheet paper (27), set the bale roller (11) in the open state, set the switching lever (4) to the neutral position, and set the platen (10) and the pinch. When the sheet is moved until it comes into contact with the contact point of the roller (13) and the manual knob (3) is rotated, the cut sheet (27) is separated by the pinch rollers (12) (13) and the platen (10). The form sheet (27) is held, and the cut form sheet (27) is conveyed according to the rotation of the platen (10).

Next, an example of inserting the cut sheet (27) from the front sheet insertion opening (5) will be described. As in the above, the switching lever (4) is set to the neutral position and the cut sheet (27) is inserted from below. Then, insert it until it abuts on the front pinch rollers (14) and (15), and rotate the manual knob (3), the cut sheet paper (27) will be removed from the pinch rollers (14) (15) and the platen (10). It is transported according to the rotation and is sent out upward.

Here, the tractor (9) at the rear portion when the continuous paper is conveyed
Alternatively, the front tractor (8) was manually switched by the switching lever (4), but via the connection gears (39) (40) and the idle gears (37) (38) interlocking with the switching lever (4). Although the above has been described with respect to an example in which the coupling of each is switched,
Instead of switching the lever (4), the embodiment shown in FIG. 10 is also possible. That is, (65) is the host computer,
Various data including print data is sent to the central information processing unit (CPU) (67) through the input circuit (66), and the platen motor (69) is rotated by the drive signal from the motor drive circuit (68). .

At this time, the CPU (6
A switching signal is applied to 7), the plunger (72) is operated by the switching circuit (71), and the connecting gear (39) (4)
One of the connection gear groups (73) including 0) is set to mesh with the platen gear (45). In the figure, (74) indicates the printer body.

The switching operation switch (70) may be provided on the printer side, and a control signal for switching may be sent from the host computer (65) by operating a keyboard. Printing paper may be set on the printer side in advance. Operation on either the rear tractor (9) or the front tractor (8) or a single-cut sheet in the same manner as when the changeover operation switch (70) is operated by operating the host computer (65). It can be performed.

As described above, when the front tractor or the rear tractor is switched, the connecting gear meshes with the platen so that the front or rear tractor responds to the rotation of the platen. In this case, it is necessary to set it at a position where it does not contact the front or rear pinch roller, and if the front tractor is used and the continuous paper is not completely ejected, the continuous paper is fed from the rear and used. At this time, the continuous paper inserted from the front side is fed in the reverse direction to the position where it does not contact the front pinch roller as described above.

(G) Effect of the Invention According to the paper transporting device of the printer of the present invention, continuous paper and single-cut paper can be fed from both the front part and the rear part of the printer body. Further, since the first and second conveying means are provided on the front and rear portions of the printer body, respectively,
You can use two types of continuous paper properly,
Continuous paper can be easily attached to each conveying means.

Furthermore, no matter whether the cut paper is inserted from the front or the back of the printer body, pinch rollers are provided in each moving path, so the leading edge of the cut paper is smoothly guided to the contact point of the pinch roller, and a reliable paper As a result, it is possible to set, and as a result, problems such as insufficient amount of cueing and skewing of the paper are eliminated.

[Brief description of drawings]

FIG. 1 is a side view of an essential part of the device of the present invention, FIG. 2 is an external perspective view showing a sheet conveying device of a printer of the present invention, and FIGS. 3 and 4 are cross-sectional views of the essential part of the same device. FIG. 5 is a perspective view of an essential part showing a state in which the bottom cabinet and the top cabinet of the same device are removed, and FIG. 6 is a plan view of an essential part showing a state corresponding to each lever position in FIG. 1, FIG. FIG. 8 is a cross-sectional side view of essential parts showing a state in which each sheet is mounted on the platen when using continuous sheets and single-cut sheets,
FIG. 9 is an exploded perspective view of essential parts showing a switching lever and a main gear driven by the operation of the switching lever, and FIG. 10 is a system block diagram of the device of the present invention. (1) ... bottom cabinet, (2) ... top cabinet, (3) ... manual knob, (4) ... switching lever, (5) ... paper insertion slot, (6) (7) ... Continuous paper, (8) …… front tractor, (9) …… rear tractor, (10) …… platen, (11) …… bale roller,
(12) (13) …… Rear pinch rollers, (14) (15) ……
Front pinch roller, (16) …… Pinch roller holder,
(17) …… leaf spring, (19) …… paper guide, (20) (2
1) tractor guide shaft, (22) print head, (23) carriage, (24) guide rail,
(25) …… Base plate, (26) …… Guide plate, (2
7) …… Single-cut paper, (28) …… Sprocket, (30)…
… Motor pulley, (32) …… Platen pulley, (35)
(36) …… Tractor gear, (37) (38) …… Idle gear, (39) (40) …… Connecting gear, (42) …… Platen shaft.

Claims (1)

[Claims] 1. A first transporting means and a second transporting means, which are respectively provided at the front and rear portions of a printer body, for feeding continuous paper to a printing portion, and a cut sheet inserted from the front portion of the printer body. And a first pinch roller which is provided in the confluent path of the moving path of the continuous paper and the moving path of the continuous paper by the first conveying means and which feeds the cut sheet to the printing section, and the single pinch roller inserted from the rear part of the printer body. A second pinch roller, which is provided at a confluence of the moving path of the form paper and the moving path of the continuous form paper by the second conveying means, and which sends the cut form paper to the printing unit, and the first or second conveyance. Selecting means for selecting either continuous paper feeding or single-cut paper feeding by means, and the first or second conveying means for selecting continuous paper feeding by the selecting means. Release the 1st and 2nd pinch rollers And a switching unit that switches the first and second pinch rollers to a state in which the sheet is conveyed in response to selection of cut sheet paper feed by the selection unit. A paper transport device for a printer, which is capable of transporting either continuous paper or single-cut paper from the rear part.