JPH0224677B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing device having a paper feeding means for feeding paper to a platen.

[Conventional technology]

Conventional printing devices of this type, such as ledger printing devices, use a device called a front inserter.The operator manually inserts the ledger into the inserter, and then the inserter automatically sets the ledger to the printing position and finishes printing. The latter ledger is automatically output. In this ledger printing device, in order to automatically detect the printing position, a photoelectric converter is attached to the inserter, or a punching device is attached to detect the punched holes, and the ledger is automatically printed. It is set at the print position. In this conventional ledger printing device, the operator has to insert the ledger sequentially, and therefore the operator has to align the print position and input the specified code from the keyboard etc. according to the ledger.
The burden on operators is increasing.

[Problem to be solved by the invention]

The present invention aims to eliminate the above-mentioned drawbacks of conventional printing devices.

[Means to solve the problem]

The above problem has been solved by the present invention, which includes a platen for feeding paper, a pressing roller provided opposite to the platen, and a paper holding section provided behind the platen for holding a plurality of sheets of paper for printing. , a paper feed roller for feeding each sheet of paper held by the paper holder toward the platen, and a second guide means to be described later that transports the paper fed by the paper feed roller to the platen. a first guide means provided below the platen and for guiding the paper fed from the rear of the platen along the platen to a position in front of the printing position in front of the platen; a second guide means, a printing means provided at a printing position in front of the platen; a printing means provided movably between a position away from the platen and a position pressing against the platen; a paper bail for pressing the paper against the platen at a position above the printing position; a paper bail driving means for moving the paper bail between a position away from the platen and a position for pressing the paper against the platen; When the paper bail is in a position away from the platen, the second guiding means guides the paper from the rear of the platen to the front of the printing position in front of the platen, and then guides the paper further upward to the printing means. A third guiding means provided between the first guiding means and the second guiding means feeds the paper until the leading edge of the paper reaches the platen, and applies a brake to the paper after the leading edge of the paper reaches the platen. This problem is solved by having a paper feeding means that exerts an action.

〔Example〕

In FIG. 1, a printing device 1 is equipped with a ledger processing device 2 at its upper portion. A hopper section 3 as a first paper holding section is installed in the ledger processing device 2,
On the bottom plate 4 whose one end is pivotally mounted in the hopper part 3,
Ledgers 5 as shown in FIG. 2 are stacked on top of each other. The bottom plate 4 is pushed upwards by a pressurer 6 under the action of a spring, thereby pressing the ledger 5 on the bottom plate against a hopper roller 7 as a feed roller. The hopper roller 7 is rotated by a motor 8 via an electromagnetic clutch 8a. 9 is a separation claw.

A guide plate 10 as a first guide means is disposed in the path of the ledger sent out by the hopper roller 7, and a stationary feed roller 11 is further disposed along this path.
and a movable pressure roller 12 that cooperates with this.
and a stopper claw 13 are arranged. A one-turn clutch 14 is connected to the shaft end of the feed roller 11, and this one-turn clutch is driven by the motor 8 mentioned above. The pressure roller 12 has both end shafts supported by a spring-loaded lever 15, and the lever 15 is supported by a plunger 16 of an electromagnet 16.
Connected to A. As a result, the pressure roller 12 is normally pressed against the feed roller 11 under the action of a spring and is spaced from the feed roller 11 when the electromagnet 16 is activated. The stopper claw 13 is controlled by a pole release electromagnet 17, and is moved out of the ledger path when the electromagnet is energized.

As shown in FIG. 2, a code 18 is printed in advance at the left or right end of the ledger depending on the printing position. Furthermore, in order to automatically set the ledger at the printing position, a printing line designation point 19 is also formed. A detector 20 for reading the code 18 and designated points 19 is arranged in the ledger path. An example of this detector is shown in FIG.

In FIG. 3, the detector 20 includes a light source 21, a lens 22, and a light receiving element 23. A light beam from a light source 21, which is a lamp or a light emitting diode, is focused by a lens 22 and is applied to the code 18 on the ledger.
If code 18 is present, the reflected rays will be weaker;
Since the reflected light beam is strong when there is no code, it passes through the slit 35 and is detected by the light receiving element 23. The light receiving element 23 is provided with one for reading a code and one for reading a designated point, and reads the code in synchronization with the feed operation signal of the platen 24.

The printing device 1 is provided with a platen 24, which is provided with a pressure roller 25 for guiding the ledger and a guide plate 26 as second guide means. A printing head serving as printing means is provided at the printing position C of the platen 21, but this is not shown. As shown in FIG.
guides the ledger sent from the rear of the platen to the front of the printing position in front of the platen, and this guide plate 26 does not become an obstacle during printing.
A paper bail 27 pivotally connected at one end is attached to the control arm 2.
The paper bail is controlled by a paper bail electromagnet 29 as a paper bail driving means via a paper bail 8, and when it is separated from the ledger or when the ledger comes to the printing position, it is pressed against the platen 24. 30 is a guide plate for the ledger after printing is completed, 31 is a discharge roller, and 32 is a stacker section as a second paper holding section. The paper discharge roller 31 is a first
As shown in the figure, it is drivingly connected to the platen 24 and rotates following the platen.

The separating claw 9 is provided, as usual, at the free end of the support 33 which is pivotally mounted on the side wall of the hopper part 3.
Due to the action of gravity, it rests on the corners of both ends of the topmost ledger of the stacked ledger bundle. Furthermore, the separating pawl 6 is provided with an elastic member 34 which thereby extends inwardly in substantially the same plane as the separating pawl 6 and thus extends in a direction closer to each other than the separating pawls.

As shown in FIG. 5, each ledger has a rounded end corner. When an attempt is made to separate such a ledger using a separation claw with a conventional structure as shown in Figure 6, the center of the ledger rises and its tip ends up on the separation claw, as shown in Figure 6. It doesn't jump up. On the other hand, when a separating claw configured as shown in FIG. 4 is used, the ledger sent out by the hopper roller 7 has both leading edge corners trying to slip under the separating claw as shown in FIG. Also, both elastic members 34 are bent as shown in FIG. 7, and exert a force in the direction of the arrow on the ledger. This force acts to flip the ledger over the separating claw, so that the ledger can be conveniently separated.

The operating name of the above-mentioned device is as follows.

When the start button of the device is pressed, the motor 8 and electromagnetic clutch 8a are energized to rotate the hopper roller 7, and the uppermost ledger of the ledgers 2 stacked in the cassette 3 is separated by the action of the separating claw 9. and is conveyed along the guide plate 10.
When the start button is operated, the electromagnet 16 is also energized, thereby causing the plunger 16A and the lever 1 to
5, the pressure roller 12 is separated from the feed roller 11. The leading edge of the ledger 5 conveyed as described above through the spaced apart rollers 11 and 12 temporarily stops when it hits the stopper pawl 13 and the curve is evened out. Then, when the electromagnet 16 stops being energized, the pressure roller 12 is again pressed against the feed roller 11, and at this time, the ledger located between both rollers is held. By energizing the pole release electromagnet 17, the stopper pawl 13 is retracted from the ledger path, and the one-turn clutch 14 is further connected to cause the feed roller 11 to rotate. The ledger is conveyed again, but before it reaches clutch 24, platen 2
4 has started rotating. The feed roller 11 is 1
By stopping the rotation of the rotary clutch 14 after one rotation, the ledger is fed by a predetermined amount, and thereafter a braking action is applied to the ledger. When the ledger that is fed by the rotation of the advance roller 11 reaches the platen 24, it is held between this and the pressing roller 25, and the platen stops after a certain period of time. After the platen is stopped, the electromagnet 16 is energized again, and the pressure roller 12 moves away from the feed roller 11 to release the ledger from its grip. At this time, the printing head is placed in the center of the device, so that even if the ledger comes out from the rear side, it is guided by a paper guide serving as a third guiding means on the printing head and sent upward. Furthermore, in this case, the paper bail 27 is connected to the electromagnet 2
9 is deenergized, so that it is separated from the platen 24. Then, the platen 24 rotates again to bring the ledger to the printing position and stops, and at the same time the electromagnet 29 is energized, which causes the paper bail 27 to be moved to the platen 24 via the control arm 28 with the ledger inserted therebetween. Pressed. In this way, the ledger is pressed against the platen in a predetermined position and is ready for printing. In that case, the ledger 5 is provided with a code 18 and a print line designation point 19, as shown in FIG.
The print line designation point 19 is read by a detector 20, and the signal is sent to a central processing unit of a computer (not shown). Based on this signal, the central processing unit supplies the platen feed amount and print information to the printing device 1, sets the ledger at a predetermined position, and performs predetermined printing. After printing is completed, the paper bail 27 is connected to the platen 24 which can resume rotation at this time.
Further apart, the ledger is thus fed by the rotatable platen and stacked onto the stacker section 32 via the guide plate 30 and the discharge roller 31.

〔Effect of the invention〕

As described above, according to the printing apparatus of the present invention, if paper is set in the paper holding section behind the platen, the paper is automatically fed one after another, thereby reducing the burden on the operator. Furthermore, although there may be some hesitation when setting the paper on the platen, during printing the paper bail necessary to press the paper against the platen is moved by the paper bail drive means, so the operator must also operate the paper bail. There is no.

In addition, in order to reliably feed the paper between the paper bail located at a distance from the platen and the platen, a second guide means provided in the printing means is used to guide the paper from the rear of the platen to the front of the printing device. Since the paper can be guided upward by the three guide means, paper jams near the paper bail can be prevented.

Further, the first guide means and the second guide means are provided with paper feeding means, and this paper feeding means feeds the paper until the leading edge of the paper reaches the platen, and applies a braking action to the paper after the leading edge of the paper reaches the platen. The paper remains stretched at all times and paper jams between both the first and second guide means are greatly reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a printing device according to the invention, FIG.
3 is an explanatory diagram of a detector, FIG. 4 is a perspective view of a feeding mechanism equipped with a separating claw according to the present invention, and FIG. 5 is a plan view of a ledger with rounded corners. FIG. 6 is a perspective view of a conventional feeding mechanism equipped with a separation claw, and FIG. 7 is a functional explanatory diagram of an elastic member provided on the separation claw. 1...Printing device, 2...Ledger processing device, 3...
Hopper section (first paper holding section), 5... Ledger (paper), 7... Hopper roller (paper feed roller), 1
0... Guide plate (first guide means), 11... Feed roller, 12... Pressure roller, 24...
platen, 26... guide plate (second guide means),
27... Paper bail, 29... Paper bail electromagnet (paper bail driving means), C... Printing device.

Claims (1)

[Claims] 1. A platen for feeding paper; A pressing roller provided opposite to the platen; A paper holding section provided behind the platen for holding a plurality of sheets of paper for printing; a paper feed roller for feeding each sheet of paper held by the paper holding section toward the platen; and a direction between the platen and a second guide means to be described later for the paper fed by the paper feed roller. a first guiding means provided below the platen and guiding the paper fed from the rear of the platen along the platen to a position in front of the printing position located in front of the platen; a guiding means; a printing means provided at a printing position in front of the platen; a printing means provided movably between a position away from the platen and a position pressing against the platen, and for printing at the printing position; a paper bail for pressing the paper against the platen at a higher position; a paper bail drive means for moving the paper bail between a position away from the platen and a position for pressing the paper against the platen; When the bail is in a position away from the platen, the printing means is provided in order to further guide the paper that has been guided by the second guiding means from the rear of the platen to the front of the printing position in front of the platen upwards. and a third guide means provided between the first guide means and the second guide means, which advances the paper until the leading edge of the paper reaches the platen and applies a brake to the paper after the leading edge of the paper reaches the platen. A printing device characterized in that it has: a paper feeding means for causing