JPS62134280A - Paper feed mechanism of printing press - Google Patents

Abstract

PURPOSE:To make the use of a slip possible even as a continuous form paper remains set to a tractor and to make the simple reset of the continuous form paper again to the tractor possible, by a method wherein prior to the changing use from the continuous form paper to the slip, a platen drive motor is reversely driven to return the continuous form paper automatically to a stand-by position. CONSTITUTION:Before a slip 23 is printed after ending the printing of a continuous form paper 26, the continuous form paper 26 is cut off at the position where it goes from a platen to a tractor 25, or it not when it goes out from the tractor 25. By pushing a continuous form paper stand-by button, a platen drive motor 62 is reversely driven to operate the platen 10 and the tractor 25 inversely and the continuous form paper 26 is reversely fed. The return of the top of the paper is detected with a paper sensor 64 and the actuation of the platen drive motor 62 is stopped several seconds later. The top of the paper stops at the stand-by position where it goes from the tractor 25 to the bottom end direction of the first guide plate 22. By lowering an operation lever 45 backward, the slip form paper 23 is inserted and can be printed with the continuous form paper 26 remaining set to the tractor 25.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention can be applied to printing devices such as printers, plotters, typewriters, etc., which can selectively use continuous form (rapid form) in addition to single form. More specifically, in such printing devices.

The present invention relates to a paper feeding mechanism that selectively transports single sheets and continuous sheets.

Conventional technology In a printing device that selectively uses single-sheet paper and continuous-sheet paper, if the rotation of the platen drive motor is always transmitted to the tractor, the tractor is always driven even when single-sheet paper is used. Therefore, in that case, the continuous form must be completely removed from the tractor, or the tractor itself must be removed from the main body of the apparatus.

However, it is very cumbersome to have to do this every time a cut sheet is used. Therefore, even in conventional printing devices, when using single-sheet paper, the rotation transmission from the platen drive motor to the tractor is cut off, eliminating the need to remove the tractor and further eliminating the need to completely remove the continuous-sheet paper from the tractor. There is something like that.

However, in such printing devices, when switching from using continuous paper to single-sheet paper, the continuous paper that was being used until then is moved to a standby position where it does not interfere with the conveyance of the next single-sheet paper. The problem was that I had to put it back, and the hassle of putting it back was a hassle.

Purpose Therefore, as described above, an object of the present invention is to provide a printing device that enables rotation transmission from the platen drive motor to the tractor when continuous sheet paper is used, and blocks the rotation transmission when single sheet paper is used. To make it possible to easily return the continuous sheet to a standby position where it does not interfere with conveyance of the single sheet when switching from using continuous sheet to using single sheet.

Structure Therefore, the paper feeding mechanism according to the present invention will be explained together with the reference numerals used in the embodiments to be described later.
When releasing the press of the paper feed roller (28) against the platen (10) by rotating in the - force direction of 5), the rotation of the platen drive motor (62) is controlled by the tractor (25). The tractor (25) transports the consecutive sheets (26) and prints them one after another, and the operation lever (45) rotates in the other direction to print on the platen (10). The paper feed roller (28)...
When pressing ..., a printing device cuts off rotational transmission from the platen drive motor (62) to the tractor (25), and sequentially prints on the inserted slip sheets (23) while conveying them. , the said consecutive slip form (26)
The platen drive motor (62) is driven in the opposite direction to reverse the platen (10) and the tractor (25), and the connection The present invention is characterized in that a consecutive form standby button is provided for returning the form (26) to a standby position (c) where it does not interfere with the conveyance of the single form (23).

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below based on an embodiment shown in the drawings.

The illustrated embodiment is a case where the present invention is applied to a digital serial printer, and FIG. 2 shows the main body of the printer.

The reference numeral (10) in the figure is a platen, which, as is known, is removably attached between the left and right side plates (11) and (12) of the printer body. Those side plates (11) and (I2) are shown in Figure 1 (
As shown in A) and (B), the stay plates (13) having an L-shaped cross section are firmly assembled and erected at specified intervals. Then, as shown in Figure 2, those side plates (
There is also a guide shaft (14) between 11) and (12).
and support stay (15) together with the platen (1
Pass the hook parallel to 0). Thus, the carriage (16) is supported by the guide shaft (14) and support stay (15). A printing hammer (17) is attached to the carriage (16), and a Digiwheel (18), a part of which is shown in FIG. 1, and a ribbon cassette (not shown) are each removably mounted in a known manner. Then, a wire (19) is attached to the carriage (16), and the wire (19) is hung between the pulleys (20) and stretched between the side plates (11) and (12). Then, the wire (19) is driven by a space motor (not shown),
A carriage (16) is guided by a guide shaft (14) so as to be able to reciprocate along the platen (10). When the carriage (16) is moved to the right in the figure, the Digiwheel (18) is rotated to select the desired type, and the selected type is successively hit with the printing hammer (17), and the ribbon cassette is Ribbon (21)
) (see FIG. 1) to print sequentially on the paper set on the platen (10), that is, the single sheet (23) or continuous sheet (26) to be described later. After printing one line, rotate the space motor in the reverse direction and return the carriage (16) to the left end in the figure.
At the same time, the platen (10) is advanced by one line to start a new line, and the carriage (16) is again moved from the column to the right in the figure to print sequentially. By repeating this process, printing on the paper is completed.

Now, as shown in FIGS. 1(A) and (B) to FIG. 3, behind the platen (10), there is a first guide plate (22) which has a flat plate shape and whose upper end is bent horizontally toward the rear. ), and attach both ends to the left and right side plates (11), respectively.
- Place it firmly on (12). First guide plate (22)
The lower part is close to the rear side of the platen (10) and faces the outer periphery of the platen (10) with a slight distance therebetween, and the upper part is slightly inclined toward the rear. and.

As shown in FIG. 1(A), a cut sheet (23) that is manually inserted from above to the rear of the platen (10) is guided and sent to the second guide plate (24).

The second guide plate (24) includes a curved curved surface portion that curves into a cylindrical shape along the lower outer periphery of the preten (10), and a flat plate-shaped curved surface portion that extends straightly from the curved surface portion toward the rear with a slight upward slope. The tip of the flat part is bent slightly backward and horizontally. Similarly, both ends thereof are fixed to the left and right side plates (11) and (12), respectively. Then, attach the front curved surface part to the platen (10
) is located close to the lower side of the guide plate (22) and faces the outer periphery of the guide plate (22) with a slight distance therebetween, and its rear flat portion extends across the lower side of the first guide plate (22) to the front of the tractor (25). Tractor (25
) is built into the printer body, and is guided by a second guide plate (24) as shown in Fig. 1(B), and the platen (10)
Set the continuous paper (26) wrapped around the paper. and,
The continuous form (26) can be moved by the tractor (25).

As shown in FIG.
As shown in Figure (A), those roller windows (27)...
...Paper feed roller (28) through the platen (10)
...... can be pressed. Paper feed roller (2
8) ... is attached to a roller shaft (29), and the roller shaft (29) is connected to a pair of rotating levers (30) and
Pass the hook between the ends of (31).

Those rotating levers (30) and (31) are connected to the stay plate (
13) and is rotatably supported by a support shaft (33) passing through the center of each other. Support shaft (33)
Attach both ends to the trigger pieces (34) of each stay plate (13).
・Support with (35) and prevent removal with E-ring (36). One end of a tension spring (37) is hung on the other end of each of the rotating levers (30) and (31). The other ends of the tension springs (37) are hooked onto the stay plates (13) (see Figure 5). However, the lever (33) rotates around the support shaft (33) at all times.
30) and (31) are given a clockwise rotational habit in the figure, and paper feed rollers (28) are pressed against the platen (10).

A camshaft (38) is arranged below the stay plate (13), and both ends are connected to the side plate (11) via bearings (39).
・Support rotatably with (12), E-ring (40)・(
In step 40), the camshaft (38) that is removed for the first time is cut out to have a semicircular cross section to form a plurality of cam portions (41). Further, a flat portion (42) is formed at one end of the camshaft (38), and one end of an arm (43) is attached to the flat portion (42) so as to be able to transmit rotation.

A caulking pin (44) is erected at the other end of this arm (43). Then, this caulking pin (44) is fitted into the elongated hole (46) at the tip of the operating lever (45).

The operating lever (45) is bent in the shape of <〃, and a cylindrical portion (47) is provided at the bent portion. The cylindrical part (
47), an end cam portion (48) is formed by cutting the cylindrical portion (47) diagonally. Then, the cylindrical portion (47) is fitted onto the rotation center shaft (49).

Thus, the operating lever (45) can be rotated about the rotation center axis (49) by holding the knob (50) at the upper end.

Now, as shown in FIG. 1(A), press the operating lever (45).
When the arm (43) is rotated and tilted backward, the arm (43) rotates counterclockwise with it around the camshaft (38).
II L, as shown in the figure, the flat portions of the cam portions (41) face the side surfaces of the rotating levers (30) and (31), respectively, with a slight gap (p) in between. Therefore, the rotation levers (30) and (31) rotate clockwise around the support shafts (33) and (33) by the force of the tension springs (37), thereby speeding up the paper roller (28). ... on the platen (1
0) and it will stop for 1 minute. Therefore, at this time, the cut sheet (23) is inserted as shown in the figure, and the first guide plate (22) is inserted.
), the second guide plate (24) guides the tip of the platen (10) and the paper feed roller (28)...
- By guiding the cut sheet (23) between the slots and holding it between them, the cut sheet (23) can be conveyed by the clockwise rotating platen (10) and manually set on the platen (10).

However, as shown in Fig. 1 (B), when the operating lever (45) is rotated and tilted toward the front, the arm (43)
rotates clockwise around the camshaft (38), and as shown in the figure, the cam portion (41)...
・Push the sides of each rotating lever (30) and (31) with ・. Therefore, the rotating levers (30) and (31) are moved against the support shafts (33) and (37), respectively, against the tension springs (37).
33) in a counterclockwise direction, and the platen (1
0) is released from the paper feed roller (28). Therefore, at this time, the consecutive ticket form (26
) is set below the tractor (25), and then the tractor (25) is driven to convey the continuous form (26),
The continuous sheet (26) is guided by the second guide plate (24) and hung on the platen (10), and then set on the upper side of the tractor (25) to convey the continuous sheet (26) to the platen (10) as shown in the figure. Can be set as possible.

Now, the rotation center axis (49) mentioned above is connected to the right side plate (12).
A release cam (51) is attached to the outside of the operating lever (45) so as to be movable in the axial direction. Release cam (
51) is a cylindrical portion (51) through which the rotation center shaft (49) extends.
2) and an arm portion (53) extending from the side thereof. An operating lever (45) is provided on the end surface of the cylindrical portion (52).
The cylindrical part (48) has the same slope as the end cam part (48) of
52) is cut diagonally to form an end cam portion (54), which is engaged with the end cam portion (48). On the other hand, a rotary pin shaft (55) mounted on the right side plate (12) is fitted into the tip hole of the arm part (53), so that the release cam (51) can slide freely in the axial direction but cannot rotate. .

By the way, an intermediate wheel (56) is further attached to the rotation center shaft (49) on the outside of the release cam (51), and is rotatable around the rotation center shaft (49) and slidable in the axial direction. do. A compression coil spring (57) is attached to the outside of the intermediate wheel (56), and an E-ring (58) is attached to the outer side of the intermediate wheel (56).
) to exit 11. The intermediate wheel (56) is biased toward one side in the axial direction, that is, toward the right side plate (12) in the illustrated embodiment.

Then, as shown in FIG. 1(B), the operating lever (45)
When rotated and tilted towards you, the compression coil spring (57
) is used to push the intermediate wheel (56) toward the right side plate (12). Therefore, as shown by the solid line in FIG. 4, the end cam part (48) and the end cam part (54) are in close contact with each other on their entire surfaces,
As shown in FIG. 1(B), the intermediate wheel (56) meshes with the left and right platen gears (59) and the tractor gear (60). As shown in FIG. 5 as well as FIGS. 1(A) and (B), the idle gear (61) meshes with the platen gear (59).
A drive gear (63) of a platen drive motor (62) fixed to the inner surface of the right side plate (12) meshes with the drive gear (63) of the platen drive motor (62). Therefore, when the platen drive shaft 1 motor (62) is created, the drive m
+ Gear (63) rotates, and its rotation is caused by the idle gear (6
1) to the platen gear (59) to rotate the platen (10). At the same time, the rotation of the platen gear (59) is controlled by the tractor teeth via the intermediate wheel (56). (fliO
) as well as the tractor (2) along with the platen (10).
5) is also driven to move the platen (10) as shown in Figure 1(B).
) is conveyed.

However, as shown in Fig. 1(A), the operating lever (45
) is rotated and tilted backward, the end cam part (
48) pushes the end cam part (54), and the intermediate wheel (56)
on the other side in the axial direction, that is, in the illustrated embodiment, the rotation center axis (4
9) to disengage its engagement with the platen gear (59) and tractor gear (60). Therefore,
In this state, the rotation of the platen drive motor (62) is transmitted to the platen (10) but not to the tractor (25). Therefore, when a cut sheet (23) is inserted as shown in FIG. 1(A), the cut sheet (23) is conveyed as the platen (10) rotates. However, even if the consecutive sheets (26) are set under the tractor (25), the consecutive sheets (26) will not be fed sequentially.

Next, when the operating lever (45) is pushed forward again, the amount by which the end cam part (48) pushes the end cam part (54) gradually decreases, and the biasing force of the compression coil spring (57) causes the intermediate wheel to move forward. (56) is gradually moved toward the right side plate (12). Therefore, as shown in Figure 1 (B), the operating lever (
45) completely to the front side and then drive the platen drive motor (62), the intermediate wheel (56) will eventually completely mesh with the platen gear (59) and the tractor gear (60) in sequence, and both end cam parts ( 48) and (54) are in close contact again on the entire surface. Then, the consecutive sheets (26) left on the tractor (25) are fed one by one.

Well, i! lI! When printing on the cut sheet (23) after printing on the slip sheet (26), the printed continuous sheet (26) is moved from the platen (10) to the tractor (25).
) as far as I can go! It (a) (see Figure 1 (B))
Or the place after leaving the tractor (25) (b) (Fig. 1 (
(see B)), and then, by pressing, for example, a continuous paper standby button (not shown) provided in the outer case, the platen drive motor (62) is driven in the opposite direction to separate the platen (10) and tractor (25). , and feed the continuous sheet (26) backwards. Then, the paper sensor (64) detects the return of the leading edge of the paper (see Figure 1 (B)).
After a few seconds, the platen drive motor (62) is activated 1#-.At this time, the leading edge of the paper is moved from the tractor (25) to the first guide plate so that it does not interfere with the conveyance of the cut paper (23). (22) Standby position toward the bottom (
C) (see Figure 1 (R)) to make a circle of 1h. As a result, the operation lever (45) is activated as shown in FIG. 1(A).
By tilting the unit backwards and inserting the single sheet (23) as shown in the figure, the continuous sheet (26) can be set on the tractor (25) without sending the continuous sheet (z6), as described above. It is possible to print on the cut paper (23).

The paper sensor (64) is mounted on a bracket (64) at the exact center of the stay plate (13), as shown in FIG.
5) Attach via. Then, the second guide plate (24
) or a dedicated sensor hole provided therein to face the platen (10).

Effects Therefore, according to the present invention, there is a printing device that enables rotation transmission from the platen drive motor to the tractor when continuous sheet paper is used, and cuts off the rotation transmission when single sheet paper is used. Before switching from using slip paper to using single slip paper, simply by operating the continuous paper standby button, the platen drive motor can be reversely driven and the continuous slip paper can be automatically returned to the standby position. After that, if you cut off the rotation transmission from the platen drive motor to the tractor, you will not have to take the trouble to remove the tractor from the device, and even if you leave the continuous paper set in the tractor, it will not be an obstacle, allowing you to use single paper. becomes possible. Then, when the continuous form is to be used next time, the continuous form can be easily set on the tractor again.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which the paper speeding mechanism according to the present invention is applied to a digital serial printer, in which Fig. 1 (A) shows when single sheet paper is used, and Fig. 1 (B) shows when continuous sheet paper is used. Diagram of the paper feed mechanism at each time. Fig. 2 is an external perspective view of the printer main body, Fig. 3 is an exploded perspective view thereof, Fig. 4 is a partially enlarged front view showing the switching mechanism that moves the intermediate wheel in the axial direction using the operating lever, and Fig. 5 is the platen. FIG. 3 is a partially enlarged front view showing a rotation transmission mechanism that transmits the rotation of the drive motor to the platen.

Claims (1)

[Claims] 1. When releasing the paper feed roller from pressing against the platen by rotating the operating lever in one direction, the rotation of the platen drive motor is transmitted to the tractor, and the tractor feeds the continuous sheet of paper. is sequentially printed while conveying the paper, and when the operation lever is rotated in the other direction to press the paper feed roller against the platen, rotation transmission from the platen drive motor to the tractor is cut off. In a printing device that sequentially prints on sheets of paper to be inserted while conveying them, the platen drive motor is operated in the opposite direction when switching from using the continuous sheet to using the cut sheet. A paper feeding mechanism of a printing device, further comprising a continuous paper standby button for rotating the platen and the tractor in the reverse direction and returning the continuous paper to a standby position where it does not interfere with conveyance of the single cut paper. 2. An intermediate wheel that transmits the rotation of the platen drive motor to the tractor is rotatably attached to the rotation center shaft of the operating lever and biased toward one side in the axial direction; Accordingly, the intermediate wheel is configured to be movable to the other side in the axial direction against the biasing force by cam operation, and when the operation lever is rotated and the paper feed roller is pressed against the platen, the intermediate wheel is moved against the other gear. The printing device disengages from the engagement with the platen drive motor to cut off the rotation transmission from the platen drive motor to the tractor, and conversely, when the pressing is released, the intermediate wheel meshes with other gears to enable the rotation transmission. A paper feeding mechanism of a printing device according to claim 1, which is applied to a paper feeding mechanism of a printing device according to claim 1. 3. Forming a cylindrical portion having an end cam portion on the operating lever, and fitting the cylindrical portion onto the rotation center shaft;
Paper feeding of the printing device according to claim 2, wherein the intermediate wheel is moved against an urging force by an end cam portion thereof as the operating lever rotates about its rotation center axis. mechanism. 4. When rotating the operating lever and pressing the paper feed roller against the platen, move the intermediate wheel against the urging force to disengage it from the other gears, and then reverse the pressing force. The paper feeding mechanism of the printing device according to claim 2, wherein the intermediate wheel is moved to mesh with another gear based on a biasing force when the intermediate wheel is released. 5. According to claim 1, wherein a paper sensor detects the leading edge of the continuous sheet of paper that is fed backwards, and the rotation of the platen drive motor is stopped, and the continuous sheet of paper is stopped at the standby position. Paper feed mechanism of printing device.