JPS58138676A - Paper feeder - Google Patents

Abstract

PURPOSE:To prevent the falling of a continuous paper when a single slip paper is printed by providing a brake to prevent the rotation of a continuous paper drive shaft in a back paper supply direction in a printer paper feeder to feed two kinds of printing papers, continuous paper and single slip paper. CONSTITUTION:During the printing period of single slip papers, the rotation of a paper feeding motor 18 for a drive shaft 9a is interrupted by the separation of the first solenoid clutch 16, and thereby a pin tractor 9 is intented to turn toward a back paper supplying direction under the weight of the continuous paper 7. In this case, since a plastic collar 31 turning integrally with the drive shaft 9a of the pin tractor 9 and a brake spring 32 wound one or two times around the acting face 30 thereof are directed toward winding direction, frictional resistance is increased and rotation toward the back paper supplying direction is interrupted. Since the drive force of the paper feeding motor 18 is sufficiently stronger than the braking force of the brake spring 32, no troubles occur during the drive period.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device in a printer capable of feeding two types of printing paper, continuous paper and cut paper.

An example of this type of device capable of feeding two types of printing paper is a device proposed by the present applicant in Japanese Patent Application No. 56-91028. In the case of paper feeding@pupil, if continuous paper is being fed by the second paper feeding device while continuous paper is being fed from the first paper feeding device, continuous The paper is held attached to the first paper feeder, and the first paper feeder has a clutch mechanism that cuts off the transmission of driving force from the paper feed motor. Since the drive shaft of the continuous paper can freely rotate in the opposite paper feeding direction, the continuous paper sometimes falls off from the first paper feeding device due to its own weight.

An object of the present invention has been made to eliminate the above-mentioned drawbacks, and one embodiment of the present invention will be described below with reference to the drawings.

゛ A platen 2 is fixed to a frame 1 of the printer as a printing mount, and its front side is a printing surface 3.

A guide shaft 4 extending parallel to the platen 2 is installed on the frame 1, and a carriage 5 is supported on the guide shaft 4 so as to be able to reciprocate. A print head 6 is mounted and fixed on the carriage 5F, and while the carriage 5 moves back and forth, a print wire (not shown) built in the print head 6 is connected.
Accordingly, printing is performed on the continuous paper 7 or the cut paper 8 on the printing surface 3 in a dot matrix.

Below the platen 2, a pair of left and right bin tractors 9 as a first paper feeding device are disposed, and the bin tractors 9 engage with feed holes (not shown) on both sides of the continuous paper 7 to continuously convey the continuous paper 7. The paper 7 is fed to a printing position in the darkness between the print surface 3 and the print head 6. Further, the pair of bin tractors 916 are provided with a paper detector 11 consisting of a limit switch, a photosensor, etc.

The configuration of the bin tractor 9 is described in detail in Japanese Patent Application No. 11 [55-94144 [Paper Feeding 1i1fJ] previously filed by the applicant of the present invention, so the explanation thereof will be omitted.

A pair of pull-out rollers 12.13 as a second paper feeding device are arranged above the printing position w10, and the continuous paper 7 and the cut paper 8 are pulled upward by the cooperation of the pull-out rollers 12.13. It is configured as follows. Further, the drawer 0-512.13 is configured to be able to be separated so that the cut sheet 8 can be inserted into the lower printing position @10.

On one end side of the drive shafts 9a and 13a of the bin tractor 9 and the pull-out roller 13, gears 14 and 15 as a drive transmission mechanism consisting of an appropriate gear ratio are meshed with each other, as shown in FIG. It is rotatably mounted and has a length. Further, on the drive shafts 9a, 13a, there are first and second electromagnetic clamps 16, 16, 16, which act as clutch mechanisms that press against the gears 14, 15 to couple and interrupt the rotation of the gears 14, 15 to the drive shafts 9a, 13a. 17 is fixed. The gear 14 includes a gear 19 fixed to the rotating shaft 18a of the paper feed motor 18.
The bin tractor 9 and the pull-out roller 13 are rotationally driven by a common paper feed motor 18. In front of the bin tractor 9, a bevaniban 20 is arranged and fixed below the printing position 10; A plurality of guide pieces 21 extending obliquely toward the lower part of the joint are bent and formed on the inner bolt part.

A ticket guide plate 22 is disposed on the rear surface of the vapor pan 20 so as to be movable up and down, and can be moved between the lower position shown in FIG. 1 and the lower position shown in FIG. 3.
It is configured to be movable between 11 directional positions.

When the single sheet guide plate 22 is placed in the lower position, it is located outside the feeding range of the continuous paper 7, and when placed in one position, one piece passes through the printing position 10 and is removed from the drawer. roller 1
Located directly below 2.13.

A plurality of positioning pieces 23 are bent and formed at a predetermined interval in the right direction of the cut sheet guide plate 22 at approximately the center of the cut sheet guide plate 22, and when the cut sheet guide plate 22 is placed at the lower position, When the positioning piece 23 is located below the guide piece 21 and the cut guide plate 22 is placed in the upper direction, the positioning piece 23
3 is positioned above the guide piece 21 so as to be able to receive the lower end of the cut sheet 8 inserted from both the pull-out rollers 12 and 1311.゛A paper cutter 24 is arranged and fixed above the paper cutter 0-512, and its cutting edge 25 touches both the drawing rollers 12 and 13.
It faces directly above the continuous paper 7 and is configured to be able to cut the continuous paper 7 at its perforations (not shown).

A switching lever 27 as a switching switch is rotatably supported on one side of the frame 1 by a shaft 26, and in order to feed the continuous paper 7, the continuous paper 7 is moved to the <a) position 1 shown in FIG. To reverse feed, move to position 1 (b) shown in Figure 2.
To insert the cut sheet 8, move it to the <C> position shown in Figure 3.
Further, in order to feed the cut sheet 8, switches or levers (not shown) located at the (d> position) shown in FIG. 4 are operated.

The detailed mechanism of the switching lever 27 and both pull-out rollers 12 and 13 is described in the patent application filed in 1986-94 by the present applicant.
144M and Japanese Patent Application No. 55-94145, the explanation thereof will be omitted.

Reference numerals 28 and 29 in the figure are paper guide plates disposed between the platen 2 and the bin tractor 9 to guide the continuous paper 7.

A plastic collar 31 is attached to a position close to the frame 1 of the drive shaft 98 of the bin tractor 9, which can rotate integrally with the drive shaft 9a and has a cylindrical outer surface working surface 30. .

A brake spring 32 is wound one or two times around the working surface 30, and one end of the brake spring 32 extending upward is hooked to a pin 33 fixed to the frame 1-t. The winding direction of the brake spring 32 is such that when the drive shaft 9a is rotated in the paper feeding direction, the brake spring 32 is unwound from the working surface 30, and when the drive shaft 9a is rotated in the opposite direction to the sheet feeding direction, the brake spring 32 is unwound from the working surface 30. This is a direction in which the frictional resistance between the brake spring 32 and the working surface 30 is increased.

Next, the operation of this embodiment will be explained.

First, in order to feed the continuous paper 7, the front end of the continuous paper 7 is attached to the bin tractor 9, and when the switching lever 27 is switched to the position (a) shown in FIG. 13, and the first and second
The electromagnetic rollers 16 and 17 are activated to couple the gears 14 and 15 with the drive shafts 9a and 13a. In addition, ticket information board 2
2 is lifted upward to 1. In the above state, the paper feed motor 18 is driven to rotate, and the rotation is caused by the gears 14, 15,
and drive shafts 9a and 1 via electromagnetic clutches 16 and 17.
3a, the bin tractor 9 and the drawer 0-
The rollers 12 and 13 are rotated in the paper feeding direction.

At this time, since the drive shaft 9a of the bin tractor 9 is rotated in the paper feeding direction, the brake spring 32 on the collar 31 is about to be unwound from the action surface 30.
hardly hinders the rotation of the drive shaft 9a. With this operation, the continuous paper 7 mounted on the bin tractor 9 is moved to printing position 1.
0 and reaches both pull-out rollers 12 and 1366, and is pulled upward by the pull-out rollers 12 and 13 at a predetermined speed.

Note that since the rotational speed of both pull-out rollers 12 and 13 is slightly faster than the feeding speed of the bin tractor 9, both pull-out rollers 1-2 and 13 pull out the continuous paper 7 while slipping at a speed faster than the feeding speed. , the continuous paper 7 is always kept stretched. When the front end of the continuous paper 7 reaches the cutting edge 25 of the paper cutter 24, a sensor (not shown) detects the front end, and based on the detection signal, the bin tractor 9,
The feeding of the continuous paper 7 by both drawers 0-ra 12 and 13 is stopped once I:. Further, during printing, each time printing for one print line is completed, the bin tractor 9 and the pull-out rollers 12 and 13 are rotated to a predetermined maximum rotation to feed the continuous paper 7 upward by one print line.

Next, move the switching lever 27 from the position (a,) shown in FIG.
,b), the second electromagnetic clutch 17
is released, the coupling of the gear 15 to the drive shaft 13a is cut off, and the pull-out roller 13 is allowed to freely rotate.

When the paper feed motor 18 is reversely rotated in the above state,
The front end of the continuous paper 7 is attached to a pull-out roller 12/1 which is idly rotated.
3 and is sent back to the bin tractor 9 side. When the drive shaft 9a rotates in the opposite paper feeding direction, the brake spring 32 wraps around the working surface 30, and the frictional resistance increases;
The driving force of the paper feed motor 18 is sufficiently large compared to its frictional resistance, and does not interfere with the rotation of the drive shaft 9a.

Then, the leading edge of continuous paper 7 is detected! 111, the paper feed motor 18 is stopped in response to a detection signal from the paper detector 11. Therefore, the continuous paper 7 is transferred to the bin tractor 9 by the device,! It is kept in the same state.

Next, move the switching lever 27 from the position (b) shown in FIG.
) position, the drawer 0-ra 12 is separated from the other drawer row 513 and the cut guide plate 22
is placed in the [azimuth -.

In the above state, the cut sheet 8 is pulled out from both sides by the rollers 12 and 12.
13, and its lower end is placed on the positioning piece 23 of the cut guide plate 22.

Thereafter, the switching lever 27 is moved from the (C) position shown in FIG.
When the switch is made to the d > position, the pull-out rollers 12 and 13 slowly return to nip the cut sheet 8 of both pull-out rollers 12 and 13, and then the cut sheet guide plate 22 is slowly returned downward.

Further, due to the dissociation of the first electromagnetic clutch 16, the drive shaft 9a
Transmission of the rotational force of the paper feed motor 18 to the paper feed motor 18 is cut off. As a result, the bin tractor 9 attempts to rotate in the wrapping paper feeding direction due to the weight of the continuous paper 7, but the collar 3
A brake spring 32 on the paper prevents the paper from rotating in the opposite direction.

That is, although the frictional resistance force of the brake spring 32 when the drive shaft 9a rotates in the opposite paper feeding direction is sufficiently smaller than the driving force of the paper feed motor 18, it is difficult to prevent the continuous paper 7 from being attached to the bin tractor 9. Set it to a size large enough to hold it.

In addition, the rotation of the paper feed motor 18 is controlled by the drive shaft 13 through the gear 14 which is idly rotated by the operation of the second electromagnetic clutch 17.
a, and the cut sheet 8 is sent downward by the rotational drive of the pull-out roller 13. The front end of the cut sheet 8 is the cutting edge 25
When it reaches the front end, the sensor detects the front edge, and after feeding the cut sheet 8 downward by a predetermined amount, the paper feed motor 1 is activated.
8 is reversely rotated, and both drawers 0-512 and 13 are reversely rotated to send the cut sheet 8 upward. When the front edge of the cut sheet 8 is detected again by the sensor, the pull-out roller 12.1
3 is stopped. Thereafter, the cut sheet 8 is sequentially fed upward by the rotation of both pull-out rollers 12 and 13 each time the printing of the 1a character line is completed.

In addition, when feeding the cut sheet 8, the pull-out rollers 12 and 1
3 is rotated so as to feed the continuous paper 7 at the same speed.

Therefore, when the paper feeding device in this embodiment interrupts printing on the continuous paper 7 and inserts the cut paper 8, the rotational force of the paper feeding motor 18 to the bin tractor 9 is reduced by disengaging the first electromagnetic clutch 16. When the transmission is cut off, the brake spring 32 prevents the bin tractor 9 and drive shaft 9a from being rotated in the opposite paper feeding direction due to the weight of the continuous paper 7, so that the continuous paper 7 does not fall off from the bin tractor 9. When the interrupt printing of the cut sheet 8 is completed, printing of the continuous sheet 7 in the basket can be resumed.

As explained above, in the paper feeding device of the present invention, when cutting cut paper is interruptedly printed during printing of continuous paper, the continuous paper that has been retracted and held in the first paper feeding device is transferred to the first paper feeding device. This makes it extremely easy to perform interrupt printing on cut sheets.

[Brief explanation of drawings]

Fig. 1 is a side view of the paper feeding device according to the present invention when continuous paper is fed, Fig. 2 is a side view when continuous paper is fed backwards, and Fig. 3
The figure is a side view when inserting a cut sheet, Fig. 4 is a side view when feeding a cut sheet, Fig. 5 is a drawing of the drive transmission mechanism viewed from diagonally above, and Fig. 6 is a partial slope showing the brake mechanism. In the figure, 7 is continuous paper, 8 is cut paper, 9 is a bin tractor as a first paper feeding device, 9a is a drive shaft, 10 is a printing position, 12 and 13 are second paper feeding devices 14 and 15 are gears as a drive transmission mechanism, 16 is a first electromagnetic clutch as a clutch mechanism, 18 is a paper feed motor, 27 is a changeover lever as a changeover switch, 32
is the brake spring. patent applicant

Claims (1)

[Claims] 1. A first paper feeding device driven by a drive shaft to feed continuous paper, and a second paper feeding device that feeds cut paper and discharges printed continuous paper. a feeding device; at least one paper feeding motor that drives the first and second paper feeding@1; a changeover switch for selecting between continuous paper feeding and cut paper feeding; and the paper feeding device. The rotation of the feed motor is transmitted to the drive shaft via the clutch IllI4, and when the changeover switch selects the cut sheet, the clutch mechanism is disengaged to cut off the transmission of the driving force to the drive shaft. A paper feeding device comprising: a drive transmission mechanism; and a brake mechanism that prevents the drive shaft from rotating in a direction opposite to paper feeding.