JPH02219669A - Paper feeder - Google Patents

Abstract

PURPOSE:To enable three different kinds of paper to be transferred with one driving motor by a method wherein a feed roller mechanism to be given in normal rotation of the driving motor, a feed roller mechanism to be driven in reverse rotation, and a driven roller arranged, in a contact with and separation from free manner, to one side driving roller, are established. CONSTITUTION:When a mode selection change-over switch is of an ordinary state, a driven roller 103 is arranged at a non paper feed position. In normal rotation of a driving roller 22, a driving roller 18 is rotated in a paper feed direction, and paper P1 is drawn out by a specific length to be transferred. Thereafter, when reversely rotated, the driving roller is rotated in the paper feed direction, and paper P2 is drawn out by a specific length to be transferred. Further, in the case where printing is performed on paper P3, when the paper is inserted to a specific position, it is detected by a paper detector 118, and a signal is inputted to a control part of a register. When the mode selection change-over switch is changed, the driven roller 103 is arranged at a paper feed position, and the driving motor 22 is actuated. In normal rotation, the paper P3 piled on receipt paper P1 are transferred by a specific length. Therefore, three kinds of paper can be transferred by one driving motor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device for a printer mainly used for a register.

[Prior Art] Conventionally, as a paper feeding device for transporting three different types of paper: receipt paper, journal paper, and validation paper, there is one disclosed, for example, in Japanese Patent Publication No. 58-31313.

In this case, drive rollers 54 and 60 are disposed on a common drive shaft 76 that is driven by a step motor 86 that rotates forward and backward through a gear train. Additionally, each pinch roller 56, 62 corresponds to each drive roller 54 and 60.
will be placed. When the drive shaft 76 rotates in one direction, the receipt paper 50 is transported by the feeding action of the drive roller 54 and the pinch roller 56, and when the drive shaft 76 rotates in the other direction, the receipt paper 50 is transported by the drive roller 54 and the pinch roller 56. The cut sheet 58 is transported by the feeding action with the pinch roller 62.

Further, the journal 1140 is wound from the supply roller 42 through the platen 44 onto the take-up spool 46.

[Problem to be Solved by the Invention 1] Incidentally, in the conventional device described above, the receipt paper 50 and the slip paper 58 are transferred by forward and reverse rotation of the common drive shaft 76 using the step motor 86 as the drive source. However, in order to transport the receipt paper 40, a drive system dedicated to the receipt paper must be provided separately from the drive shaft 76 to transport the receipt paper, resulting in a complicated structure. This results in high costs.

An object of the present invention is to provide a paper feeding device that can transport three different types of paper, such as receipt paper, receipt paper, and slip paper, using a single drive motor that rotates in forward and reverse directions as a drive source.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a single drive motor that rotates in forward and reverse directions, and a drive motor that is driven in the paper feeding direction via a one-way clutch when the drive motor rotates in the forward direction. a first feed roller mechanism that transports the first sheet by having a first drive roller driven by the drive motor; and a second drive roller that is driven in the paper feed direction via a one-way clutch when the drive motor is reversed. a second feed roller mechanism for transporting a second sheet of paper;
The third driven roller is provided so as to be able to move toward and away from at least one of the two driving rollers, and transports the third sheet.

[Function] In the paper feeding device configured as described above, when the drive motor rotates normally, the first feeding roller mechanism is driven in the paper feeding direction via the one-way clutch and has the first driving roller. Paper, for example receipt paper, is transported.

When the drive motor reverses, a second paper, for example a journal paper, is transported by a second feed roller mechanism having a second drive roller driven in the paper feed direction via a one-way clutch.

Roughly speaking, when the third driven roller is in contact with at least one of the first and second driving rollers with a third sheet of paper, for example, a cut sheet in between, the drive motor is The third paper is transported by the paper transport action of the drive roller and the third driven roller, which are driven in the paper transport direction during rotation or reverse rotation.

[Example] Embodiment 1 of the present invention will be described with reference to the drawings.

In FIG. 3 showing a side view of a printer mainly used for a register, FIG. 4 showing a plan view, and FIG. There is.

A vapor holder 4 is attached to the rear side of the main body frame 3 of the printer main body 2. This vapor holder 4 has
Receipt paper P wound into a roll as the first paper
Each paper storage section 5 has an upper opening and is partitioned by a partition wall for storing journal paper P1 and journal paper P2 wound into a roll as a second paper side by side on the left and right.

Further, the vapor holder 4 is provided with a guide plate 6 toward the main body frame 3 for guiding the drawn-out portion of each roll paper Pi, P2 stored in each paper storage section 5 toward a print head 8, which will be described later. It has been extended.

A feed cam shaft 7 is rotatably installed between the left and right side walls 3a of the main body frame 3. This feed cam shaft 7
A carriage 9 having a print head 8 is fitted on the shaft so as to be movable in the axial direction of the camshaft 7 . Then, in a state where the cam groove formed in the feed cam shaft 7 and the slider protruding from the inner peripheral surface of the shaft hole of the carriage 9 are fitted, the feed cam shaft 7 continuously rotates in one direction. The carriage 9 is configured to slide back and forth in the axial direction.

Note that the feed cam shaft 7 is connected to the gear train 1 as shown in FIG.
It is connected to the carriage drive motor 11 via 0:a.

An opening/closing body 12 is supported on the left and right side walls 4a of the vapor holder 4 on one end side of the left and right side walls 12a using a support pin 13 as a fulcrum, and is always supported in the opening direction by a spring 14. is energized by A flat platen 15 extending vertically is attached to the other end (free end) of the copper end of both side walls 12 a of the opening/closing body 12 at a position facing the print head 8 . Platen 1
As shown in FIG. 5, each roll of paper P1. Upper and lower guide plates 16 and 17 are extended to respectively guide the drawer portions of P2, and the guide plate 16 on the abrasive feed side of the platen 15 faces the guide plate 6 of the vapor holder 4 and guides the paper feed path. It consists of

the paper sending side of the print head 8 and platen 15;
That is, on the downstream side, the printer main body 2 side and the opening/closing body 1
2 side, each of the roll paper P1. First and second driving/driven rollers 18 for transporting P2.
19, 18-19' are arranged respectively. Further, the driving/driven roller 18.19.18=
As shown in FIG. 5, 19' vertically faces above the platen 15 on the side of the opening/closing body 12 with respect to the extension surface of the gap between the print head 8 and the platen 15.

Then, inserting a cut sheet (validation sheet, slip sheet, etc.) P3 as a third sheet into the gap from above causes each of the first and second driving and driven rollers 18
．． 19.18” 19- is permitted without hindrance.

That is, in this embodiment, as shown in FIG.
is installed, and first and second drive feed rollers 18, 18.corresponding to the respective rolls of paper Pi, P2 are rotatably fitted around the axis of this roller shaft 20, respectively.

Furthermore, around the axis of the roller shaft 20, the first. Bevel gears 18a, 18a= are rotatably fitted on the opposing surfaces of the second drive rollers ia, ia-, respectively, and these bevel gears 111F3a, 18a- and each drive roller 18, 18- First and second clutch springs 101 and 102 forming one-way clutches that permit different rotational directions are interposed between the two. 1st, 2nd
The clutch springs 101 and 102 are tightly wound around the boss portions of the bevel gears 18a and 18a'' with their winding directions reversed, without any gaps, and the clutch springs 101 and 102 are wound tightly around the boss portions of the respective bevel gears 18a and 18a'', and one end portion 101a of each of the clutch springs 101 and 102 is tightly wound around the boss portions of the bevel gears 18a and 18a''.

102a is latched in a latching groove formed in the end face of each of the first and second drive rollers 18, 18'. and,
Only when the bevel gears 18a, 18a' rotate in a direction that reduces the diameter of the first and second clutch springs 101, 102, the torque is applied to the boss portions of the bevel gears 18a, 18a- and the first and second clutch springs 101, 102. The friction force generated at the gate with each clutch spring 101, 102 is transmitted to each drive roller 18, 18''. Furthermore, the bevel gears 18a, 18a- When rotating, slippage occurs between the boss portions of the bevel gears 18a, 18a' and each clutch spring 101, 102, so that torque transmission of the bevel gears 18a, 18a'' to the drive roller 18.18 is cut off. It has become.

As shown in FIG. 2, a drive gear 21 integrally provided with a bevel gear 21a that meshes with the bevel gears 18a, 18a-, respectively, is installed on the free end side of the left and right side walls 12a of the opening/closing body 12. It is rotatably supported by the cross frame 12b and is meshed with an output gear 22a of a drive motor (stepping motor) 22 which is mounted on the cross frame 12b and is capable of forward and reverse rotation. And the drive motor 22
The forward rotation causes only the first driving roller 18 to rotate in the paper feeding direction, and the reverse rotation causes only the second driving roller 18' to rotate in the paper feeding direction.

At the rear upper end of both side walls 3a of the main body frame 3, a third
As shown in FIG. 6 and FIG. 6, a support wall 3b extending upward is formed, and a vertically elongated hole 23 penetrating through the upper part of both of these supporting walls 3b is movable along the elongated hole 23. A roller shaft 24 is supported so as to be movable up and down. This is possible! il1
First and second driven rollers 19 and 197 are rotatably fitted on the axis of the roller shaft 24, facing the first and second driving feed rollers 18 and 18', respectively. .

These first and second driven rollers 19°19'
is normally urged together with its movable roller shaft 24 by a spring 25 toward the paper feeding position below the elongated hole 23. In this paper feeding position, each driven roller 19, 19- rotates in contact with each driving roller 18, 18- to perform a paper feeding action.

Furthermore, in the retracted position where both the first and second driven rollers 19 and 19' move together with the movable roller shaft 24 to the upper part of the elongated hole 23, they escape to the outside of the open m locus of the b'ri rM body 12. 1 m of the opening/closing body 12 is allowed without obstruction.

At the rear of the outer surface of the left and right side walls 3a of the main body frame 3,
As shown in FIG. 3, a pair of lock operation levers 26 are provided for removably locking the opening/closing body 12 in the closed position.
is rotatably supported at its lower part using a support bin 27 as a fulcrum.

This lock operation lever 26 has side walls 3 of the opening/closing body 12.
A lock pawl 26a is formed to removably engage with a lock pin 28 protruding from the free end of the outer surface. The lock operating lever 26 is normally urged by a spring 29 in the locking direction in which the lock claw 26a engages with the lock pin 28. Furthermore, the lock operation lever 26
extends upward to a position along the support wall 3b of the main body frame 3 and beyond the support wall 3b by a predetermined height.

An operating piece 26t) for rotating the lock operating lever 26 in the unlocking direction is formed at the upper end of the lock operating lever 26. Further, by placing the lock operation lever 26 in the lock position, both the first and second driven rollers 19, 19- are placed in the paper feeding position, and the lock operation lever 26 is rotated to the unlock position. In conjunction with this, both the first and second driven rollers 19 are placed in the retracted position. That is, an elongated cam hole 30 is formed in the upper part of the lock operation lever 26, into which the shaft end of the movable roller shaft 24 of both the first and second driven rollers 19 is movably inserted. This cam hole 30
is the lock operation lever 26 from one end to the other end.
The support bins 27 are formed in an oblique or curved shape in which the distance between them increases successively. As shown in FIG. 3, when the lock operation lever 26 is in the lock position, the movable roller shaft 24 is located at one end side of the cam hole 30, and both the first and second followers of the roller shaft 24 are located at one end side of the cam hole 30. A rib row 519 is arranged at the paper feeding position. Furthermore, as shown in FIG. 6, by rotating the lock operation lever 26 in the unlocking direction, the movable roller shaft 24 is moved into the cam hole 30.
While being pushed up by the cam surface of the main body frame 3, the elongated hole 23
By rotating the lock operation lever 26 to the unlock position, both the first and second driven rollers 1
9.19'' is placed in the retracted position, and as shown in FIG. 7, the opening/closing body 12 is opened using the support bin 13 as a fulcrum by the biasing force of the spring 14.

The lock operation lever 26 also has a cam hole 30.
A locking hole 31 is formed continuously at the other end. Then, when the lock operation lever 26 is rotated to the unlock position, the locking hole 31 and the movable roller shaft 24 are engaged, whereby the lock operation lever 26 is unlocked against the biasing force of the spring 29. Hold the driven roller 19 in the locked position.
19- is held in the retracted position against the biasing force of the spring 25.

Further, as shown in FIGS. 3 and 4, a roller support groove 32 with an upward opening is formed in the shape of a notch in one side wall 12a and the intermediate wall 12b of the WIm body 12. In the roller support groove 32, each of the second driving and driven rows 5 is provided.
Journal paper P2 sent from 1g-, i9-,
A winding roller 33 for winding up an amount corresponding to the feed length is rotatably supported on the roller shaft 34 and removably supported together with the roller shaft 34.

The winding roller 33 is connected to the second drive 10-518 via a belt mechanism 35, as shown in FIGS. 3 and 4. As shown in FIGS. 1 and 2, the horizontal belt f1 35 has both driving and driven pulleys 36, 37 disposed on the inner surface of one side wall 12a of the opening/closing body 12, and these pulleys 36.37. An endless belt 38 stretched between 37
It is mainly composed of.

A gear 36a is formed on the drive pulley 36 and meshes with a gear 18b' formed on the second drive roller 18'. Further, the driven pulley 37 has a gear 37 that meshes with a gear 34a formed on the roller shaft 34 of the winding roller 33.
a is formed.

Then, by reversing the drive motor 22, the second drive row 5
During cantering when the roller 18' is driven, the torque of the second drive roller 18- is transmitted to the roller shaft 34 of the take-up roller 33 via the belt 11vI35. Furthermore, the torque transmitted to the roller shaft 34 is the l! between the roller shaft 34 and the take-up reroller 33! Within the range of I friction force,
This is transmitted to the take-up roller 33, and the take-up roller 33 winds up the drawn-out edge of the receipt paper P2 by an amount corresponding to the feed m of the receipt paper P2 by the second drive row 518'.

Also, one side wall 4 of the vapor holder 4 of the printer main body 2
An arcuate sector gear 39 centered on the support bin 13 of the opening/closing body 12 is formed on a.

This sector gear 39 is removably engaged with the gear 37a of the driven pulley 37 of the belt mechanism 35, and as shown in FIG.
It is formed at a position where the mesh with a is disengaged. moreover,
When the opening/closing body 12 is opened by a predetermined amount from the rIIia position, the l1137a and the sector gear 39 mesh with each other, and as the opening/closing body 12 is subsequently opened, the winding roller 33
The roller shaft 34 of is rotated in the rewinding direction, and on the contrary,
By closing the opening/closing body 12 in the open position, the roller shaft 34 is rotated in the winding direction.

A third follower roller is configured to face the first drive row 518 on an extended surface of the gap between the print head 8 and the platen 15 so as to be able to come into and out of contact with the first drive row 518, and is for transporting the cut sheet P3 as the third sheet. 13 is provided. Said third driven roller 1
As shown in FIG. 3, the third paper feeding unit 104 equipped with the paper feed unit 104 is removably attached to the upper surface of the printer main body 2 so as to cover the upper part of the print head 8. That is, the third
As shown in FIG. 1, the mounting frame 105 of the paper feed unit 104 is formed in the shape of a rectangular box that opens downward, and can be detachably attached to the top surface of the printer main body 2 using screws 106 at mounting pieces 105a on the bottom surface of both side plates. It is fastened.

On one side of the top plate 105b of the mounting frame, there is a sliding plate 1 that rotatably supports the third driven roller 103.
07 is guided by a pair of left and right guide pieces 108 formed on the top plate 105b, and is assembled so as to be movable forward and backward.

Furthermore, an interlocking arm 1 is provided near the other side of the bottom surface of the top plate 105b.
An electromagnetic solenoid 109 is attached by screws 110 for moving the sliding plate 107 forward and backward through the screws 11 and for moving the third driven roller 103 toward and away from the first driving roller 18 .

As shown in FIGS. 1 and 2, the MvJ arm 111 is located between the sliding plate 107 and the electromagnetic solenoid 107, and is rotatably attached to the lower surface of the top plate 105b using the bin 112 as a fulcrum. Further, in the interlocking arm 111, a bottle 114 protruding from the sliding plate 107 is fitted into a notch-shaped connecting groove 113 formed at one end thereof.
Connection piece 111a formed on the other side of the interlocking arm 111
However, the electromagnetic solenoid 1 is
It is connected to the tip of plunger 109a of No. 09. Furthermore, the interlocking arm 111 is normally urged in a direction in which the sliding plate 107 is moved backward by the elastic force of the spring 117. When the electromagnetic solenoid 109 is in a de-energized state, the elastic force of the spring 117 causes the interlocking arm 111 to rotate counterclockwise in FIG. 2, thereby moving the sliding plate 107 to the rearward end. At the same time, the third driven roller 103 is connected to the first drive roller 1.
8 and is arranged at a non-paper feeding position δ. Then, as shown in FIG. 5, the first drive roller 18
The cut sheet P3 can be inserted into a predetermined position through the space between the print head 8 and the third slave roller 103 and between the print head 8 and the platen 15.

At a predetermined position in the printer main body 2, there is a paper detector 11 equipped with a light emitting element and a light receiving element that photoelectrically detects the paper P3 when the cut paper P3 is inserted to a predetermined position.
8 are arranged. Then, when the detection signal of the cut paper P3 by the paper detector 118 is input to the control section of the register (not shown) and the mode selection switch on the keyboard is switched to the position corresponding to the cut paper, the electromagnetic solenoid 109 is excited. As a result, the plunger 109a is retracted, and the interlocking arm 111 is moved by the spring 1.
The sliding plate 107 is rotated in the direction of advancing against the elastic force of the plate 17, and the third driven roller 103 of the plate moves to the 11II! ! It is arranged at a paper feeding position where the moving roller 18 and the cut sheet P3 are in contact with each other in between.

This embodiment is constructed as described above. Therefore, in the normal state in which the mode selection switch on the keyboard of the register (not shown) is switched to the position corresponding to the receipt paper P1 and the journal paper P2, the third driven
- roller 103 is arranged at a non-paper feeding position away from first drive roller 518 . In this state, the drive motor 22 is activated and rotates in forward and reverse directions.

When the drive motor 22 rotates normally, its output gear 22a
, the first drive row 518 is rotated in the paper feeding direction via the drive teeth *21, the bevel gears 21a and 18a, and the first clutch spring 101. Then, a first drive roller 18 and a first drive roller that rotates to follow the receipt paper P1 with the same roller sandwiched therebetween.
The receipt paper P is moved by the paper feeding action with the driven roller 19.
1 is pulled out by a predetermined length and transferred. At this time, the bevel gear 18a- on the second drive roller 18' side is rotated in a direction to expand the second clutch spring 102, and the bevel gear 18a-
88' and the clutch spring 102, the torque of the drive motor 22 is reduced to the bevel gear 18.
8- and the second clutch spring 102,
The second drive roller 18' does not rotate.

After the receipt paper P1 is pulled out and transported by a predetermined length by the forward rotation of the drive motor 22, the drive motor 22
is reversed. Then, the output gear 22a1 drive gear 2
1. Bevel gears 21a, 18a' and second clutch spring 1
02, the second drive roller 18' is rotated in the paper feeding direction. Then, on the same day, the second drive roller 18'
The journal paper P2 is pulled out and transported by a predetermined length by the paper feeding action of the second follower l0-519' which rotates to follow the journal paper P2 with the receipt paper P2 sandwiched therebetween.

At this time, since there is slippage between the bevel gear 18a of the first drive roller 18 and the first clutch spring 101, the first drive roller 18 does not rotate.

Each of the sheets P1. When the transfer of P2 is stopped, the print head 8 is driven based on print data output from a print head drive device built into a register (not shown), and the same printing is performed on each of the sheets Pi and P2.

Next, when printing on the cut sheet P3, insert the cut sheet P3 through between the first driving roller 18 and the third driven roller 103 and between the print head 8 and the platen 15 until it reaches a predetermined position. , the cut sheet P3 is detected by the sheet detector 11
8, and the signal is input to the control section of the register. Here, when the mode selection switch on the keyboard is switched to the position 1 corresponding to the cut sheet P3, the electromagnetic solenoid 107 is activated and its plunger 109a is retracted. Then, the interlocking arm 111 is rotated clockwise in FIG. 2 with the bin 112 as a fulcrum, and the sliding plate 107 is advanced toward the first drive roller 18. Then, the third driven roller 10 of the sliding plate 107
3 is placed at a paper feeding position sandwiched between and in contact with the first drive roller 18 and the cut sheet 83. In this state, the drive motor 22 is operated, and the motor 22 is rotated in forward and reverse directions.

When the drive motor 22 rotates normally, the slip paper P3 is overlapped with the receipt paper P1 and transported by a predetermined length by the paper feeding action of the first drive roller 18 and the third driven roller 103, which are driven in the paper feeding direction. Ru.

Then, printing is performed on the cut sheet P3 by the print head 8 that is driven when the sheet P3 is stopped being transferred. Note that when the first driving roller 518 is rotated in the paper feeding direction, the receipt paper P1 is transported by a predetermined length by the paper feeding action of the first driving roller 18 and the first subordinate roller 19. Since the cut paper P3 is located on the print head 8 side with respect to the receipt paper P1,
Printing is performed on the cut sheet P3, but not on the receipt sheet P1.

In addition, in the embodiment described above, clutch springs 101 and 102 were employed as one-way clutches that connect the drive motor 22 and the first and second drive rollers is, is-, but the present invention is not limited to this. For example, a gear mechanism meshing in one direction may be employed.

[Effects of the Invention] As described above, according to the present invention, three sheets of paper can be transported using one driving motor that rotates forward and backward, and the paper feed for transporting the three sheets of paper is The structure of the device can be simplified and costs can be reduced.

Moreover, due to the structure in which the first drive roller is driven in the paper feeding direction via the one-way clutch when the drive motor rotates in the normal direction, and the second drive roller is driven in the paper feeding direction when the drive motor rotates in the reverse direction,
Unlike the case where both second drive rollers are driven at the same time, it is possible to use a drive motor with a small driving force, and it is possible to reduce the manufacturing cost and operating cost of the paper feeding device.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is an exploded perspective view of the main parts of the paper feeding device, Fig. 2 is a partially cutaway plan view, and Fig. 3 is a perspective view showing the main parts of the paper feeding device. 4 is a plan view, FIG. 5 is a side sectional view, and FIG. 6 is a side view showing the state in which the lock operation lever is rotated in the unlocking direction. FIG. 7 is a side view showing the opened N-body. 1... Printer 2... Printer main body 18... First drive roller 18'... Second drive roller 19... First driven roller 19'... Second driven roller 22...・Drive motor 101...First clutch spring 102...Second clutch spring 103...Third driven roller 107...Sliding plate 109-・Electromagnetic solenoid 118...Paper detector Pl... Receipt paper P2...Journal paper P3...Slip paper

Claims (1)

[Claims] The first paper is transported by having one drive motor that rotates in forward and reverse directions, and a first drive roller that is driven in the paper feeding direction via a one-way clutch when the drive motor rotates in the normal direction. a second feed roller mechanism that transports a second sheet by having a first feed roller mechanism, a second drive roller that is driven in the paper feed direction via a one-way clutch when the drive motor reverses; 1. Of both the second drive rollers,
A paper feeding device comprising: a third driven roller that is movable toward and away from at least one driving roller and that transports a third sheet of paper.