JPS587473B2 - Printing paper conveyance device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for conveying printing paper in synchronization with the printer in a line printer that prints dates, numbers, etc. on tickets and the like.

In a line printer that prints the date and number on a ticket while conveying a roll of printing paper, it is necessary to stop conveyance of the paper during printing.

Therefore, conventionally, as shown in Figure 2, if the length of the ticket A is L, this L is divided into equal lengths of L/5, and the paper is intermittently conveyed in increments of L/5. We are using the following methods.

FIG. 1 shows a typical example of such a conventional printer.

That is, 1 is a printing paper, 2 is a type drum, and 3 is a hammer, and the paper 1 is conveyed by a drive roller 4 and a vinyl roller 5.

A ratchet 6 is provided on the shaft of the drive roller 4, and a swing pawl 7 is engaged with the ratchet 6 to rotate the drive roller 4.

The swing claw 7 engages with a pin q of a rotary disk 9 rotated by a one-turn clutch 8 and swings.

As is well known, this one-turn clutch 8 is a clutch in which power transmission is cut off every turn, and this one turn causes the pawl 7 to make one reciprocating motion, thereby moving the paper to the above-mentioned length of L/5. The paper is fed by a distance of 1, then stops, and during this stop, the hammer 3 is used to print.

That is, in the case of the ticket shown in FIG. 2, when the first L/50 part a of the ticket A stops at the type drum 2 and hammer 3, the date 10 is printed, and then the L/50 part a is printed. 5
When the final part e of L/5 is located on the type drum 2 and hammer 3 after intermittent feeding as b, c, and d, the ticket number is 11.
print.

However, as is clear from FIG. 2, parts b, c, and d do not require printing, so there is no need to stop them.

Conventionally, as mentioned above, intermittent feeding is performed at regular intervals, so it is necessary to perform intermittent feeding even to unnecessary parts.
Not only are there problems such as noise generation and shortened parts life due to the operation of the intermittent feed mechanism, but there is also a drawback that the feed speed is reduced by the amount of unnecessary intermittent feed.

The present invention provides a printing paper conveyance device with a simple structure that eliminates the above-mentioned drawbacks by stopping the paper only at the portion where printing is necessary.

Hereinafter, one embodiment of the present invention will be described based on the drawings from FIG. 3 onwards.

In FIG. 3, reference numeral 4 denotes a drive roller, and the drive roller 4 is driven via gears 12, 13, and 14.

This gear 12 is attached coaxially with the drive roller 4, and the gear 14 is fixed to the shaft of the one-way clutch 15 on the transmission side.

By controlling this one-way clutch 15 by a control mechanism 16, the drive roller 4 is stopped at a predetermined position.

FIG. 4 to FIG. 8 show the one-way clutch 15 and the control mechanism 1.
6 specific examples are shown.

The illustrated example uses a roller clutch as the one-way clutch 15.

That is, 17 is a shaft to be transmitted, and the gear 14 is fixed to the shaft 17 to be transmitted.

Furthermore, a clutch plate 18 is rotatably supported on the transmitted shaft 17.

The clutch plate 18 has an inner ring 2 having three grooves 19.
0 is provided integrally.

The inside of the inner ring 20 is hollow, and an inclined cam 21 fixed to the transmitted shaft 17 and having a flat portion 23 facing the split groove 19 is loosely inserted into the hollow portion.

A roller 22 is inserted into the split groove 19 and comes into contact with the flat portion 23 of the inclined cam 21.

On the outside of the inner ring 20, an outer ring 25 is rotatably supported on the transmitted shaft 11 via a bearing member 24 (FIG. 5).
are fitted.

A mounting portion 26 is integrally formed on the outer ring 25, and a power transmission gear 27 is mounted on the mounting portion 26.

A spring bearing ring 28 is fixed to the transmitted shaft 17, and springs 29, 2 are connected between the spring bearing ring 28 and the clutch plate 18.
It is multiplied by 9.

As a result, the transmitted shaft 17 is urged counterclockwise in FIG. 6, and the tilt cam 21 fixed to the transmitted shaft 17 is always tilted clockwise as shown in FIG. 7 (b) and FIG. 8 (b). The rollers 22 are pressed against the inner peripheral surface of the outer ring 25.

Therefore, if the outer ring 25 is driven in the counterclockwise direction of FIG. 7B or FIG. Since the direction is , the clutch plate 18
When the inner ring is rotatable, the rollers 22 rotate around the shaft 17 while being pressed against the inner peripheral surface of the outer ring 25 by the inclined cams 21. Therefore, the transmitted shaft 17 rotates through the rollers 22 and the inclined cams 21. The clutch plate 18 is also driven in the same direction via the rollers 22 and the inner ring 20.

Note that when the outer ring 25 is rotated in the opposite direction, that is, clockwise in FIGS.
Since the rollers 22 are urged in the same direction in the figure by the springs 29 and 29 via the spring 17, the roller 22 is released from the state of being clamped between the outer ring 25 and the inclined cam 21 and rotates idly. The frictional force between the outer ring and the rollers becomes smaller, and only the outer ring idles.

Two stoppers 30 and 31 are formed on the outer periphery of the clutch plate 18. The stoppers 30 and 31 are formed of locking steps.

A clutch plate control mechanism 32 that engages and disengages the stoppers 30 and 31 is provided.

As shown in FIG. 7, the control mechanism 32 includes a lever 34 pivotally supported on a shaft 33, a solenoid 35 that swings the lever 34, and a tension spring 3 that urges the lever 34 clockwise.
It consists of 6.

When a signal is given to the solenoid 35, the lever 34 moves to the seventh position.
It is rotated to a position away from the locking step portions 30, 31 as shown in Figures 9 and 8B, and in this state, power is transmitted to the transmitted shaft 11 as described above.

Therefore, the drive roller 4 is driven via the gear 14,
Paper 1 is transported.

When the solenoid 35 loses the signal, the lever 34 is rotated clockwise by the tension spring 36 to close the stoppers 30, 31.
to be locked.

As a result, rotation of the clutch plate 18 is prevented and the inner ring 2
0 does not rotate, the rollers 22 only idle (rotate) as the outer ring 25 rotates, and therefore the outer ring 2
5 rotates while idling the roller 22, and as a result gear 1
It stops after 40 rotations.

One rotation of the one-way clutch 15 transports the paper 1 by the length of one ticket, that is, L.

Then, conveyance of the paper is stopped at the positions of date 10 and number 11 at both ends of ticket A.

This stopping position is set by the stoppers 30 and 31.

That is, when the lever 34 is engaged with one of the stoppers 30, the conveyance of the paper 1 is stopped as described above, and the date 10 is printed at this position.

When the lever 34 is unlocked by the solenoid 35 after printing is completed, the clutch plate 18 rotates and the paper 1 is conveyed.

Then, the lever 34 is engaged with the next stopper 31 to stop conveyance of the paper, and the number 11 is printed at this position.

As described above, according to the present invention, the outer ring to which the gear connected to the power source is fixed is rotatably attached to the transmission shaft connected to the roller for conveying the printing paper, and the inner ring having split grooves at a plurality of locations is installed. A clutch plate integrally provided inside the outer ring and having a plurality of stoppers is provided on the transmitted shaft, an inclined cam having a flat portion at a portion facing the split groove is provided inside the inner ring, and a clutch plate is provided on the transmitted shaft. fixed to,
A spring bearing ring is fixed to the transmitted shaft, a spring is provided between the spring bearing ring and the clutch plate, and the spring biases the clutch plate in a direction opposite to the direction of rotation of the outer ring by the power source; Since this printing paper conveying device is provided with a clutch control means that stops the rotation of the clutch plate by stopping the rotation of the clutch plate, the configuration is simple, and the distance between the stoppers of the clutch plate and the drive of the clutch control means can be adjusted. By setting the timing appropriately, the paper can be configured to stop feeding only in the area where printing is required, and to continue feeding the other areas, which reduces the number of paper stops compared to the conventional method. The advantage is that the printing speed is faster and the noise is reduced, and the clutch is used less frequently and has a longer clutch life.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of a printer using a conventional printing conveyance device, Fig. 2 is a plan view of a ticket printed by the same printer, and Fig. 3 shows an embodiment of the present invention. 4 is a side view showing an example of the clutch used in the present invention, FIG. 5 is a sectional view of the same, and FIG. 6 is a cross-sectional view of the clutch shown in FIG.
VI line sectional view, Figure 7 A, mouth is a sectional view taken along line 1-2 in Figure 4, where A shows the clutch disengaged state and the clutch engaged state. Figure 8 A is a sectional view taken along the line ■■ in Figure 4, and Figure 8A shows the clutch disengaged and the clutch engaged. 1...Paper, 2...Type drum, 3.
...Hammer, 4..., Drive roller, 15
...One-way clutch, 16...Clutch control mechanism, 30, 31...Stopper, 34.
·····lever.

Claims (1)

[Claims] 1. An outer ring to which a gear connected to a power source is fixed is rotatably attached to a transmission shaft connected to a roller for conveying printing paper, and an inner ring having grooves at multiple locations is integrated inside the outer ring. A clutch plate having a plurality of stoppers is provided on the transmitted shaft, an inclined cam having a flat portion at a portion facing the split groove is provided inside the inner ring and fixed to the transmitted shaft; A spring bearing ring is fixed, and a spring is provided between the spring bearing ring and the clutch plate for biasing the clutch plate in a direction opposite to the direction of rotation of the outer ring by the power source, and further latched to a stopper of the clutch plate. A printing paper conveyance device comprising a clutch control means for stopping the rotation of a clutch plate.