JP2513497Y2 - Printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a paper feeding device of a printer used for a register, a word processor, a computer and the like.

(Prior Art) Known paper feeding devices for printers are disclosed in, for example, Japanese Patent Publication No. 57-2514, Japanese Patent Publication No. 58-394, and Japanese Patent Publication No. 58-31313.

Further, in this type of paper feeding device, a pair of paper feeding rollers is generally arranged on either the upstream side or the downstream side of the printing means in the paper feeding direction.

(Problems to be solved by the invention) By the way, in the case where the paper feed roller is arranged on the upstream side of the printing means, the recording which is transported toward the delivery port through the printing means by the paper feeding action of the paper feeding roller. "Slack" is likely to occur on the paper. Then, the "slack" causes an excess or deficiency in the pitch between the print lines on the recording paper, and sometimes the leading end of the print head forming the printing means catches the slack portion of the recording paper and damages the recording paper. There is a case.

Further, in the case where the paper feed roller is arranged on the downstream side of the printing means, the occurrence of the above-mentioned trouble can be prevented, but the pull-out edge of the recording paper is inserted into the paper feed roller through the printing means to remove the recording paper. The work of setting it becomes difficult. Further, in the case where the paper feeding roller is arranged on the downstream side of the printing means, there is a problem that when the recording paper is transferred in the reverse direction (upstream side) by the paper feeding roller, "slack" occurs in the recording paper. It was

In view of the above-mentioned conventional problems, the present invention provides a paper feeding device that can prevent the occurrence of "slack" in both forward and backward feeding directions of recording paper and that can easily set the recording paper. The purpose is to do.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a printer according to the present invention is configured such that a first paper feeding unit is provided upstream of a printing unit in a paper feeding direction and a second paper feeding unit is provided downstream of the printing unit. Disposing each feeding means,
In the printer, which normally feeds the paper from the upstream side to the downstream side by positively driving the paper feeding means and reversely drives the paper from the downstream side to the upstream side, First switching means for switching the paper feeding operation of the paper feeding means to valid or invalid, second switching means for switching the paper feeding operation of the second paper feeding means to valid or invalid, and a sheet from the upstream side of the printing means. When inserting, the first and second switching means make the paper feeding action of the first and second paper feeding means effective, and the first and second paper feeding means are positively driven to insert the paper. At the time of forward feeding of the finished paper with printing, at least the second paper feeding means is made effective by the second switching means and the second paper feeding means is normally driven to finish the insertion. When sending paper back And and a control unit for inversely driving the first paper feeding means together to enable the first sheet feeding means by the first switching means.

(Operation) In the printer configured as described above, when the paper is inserted from the upstream side of the printing means through the printing means and set, the first operation on the upstream side of the printing means is performed by the switching operation of the first and second switching means. In the state where both the paper feeding means and the second paper feeding means on the downstream side are arranged in the effective position,
By positively driving the first and second paper feeding means,
After the edge of the paper supplied to the first paper feeding means is transferred to the second paper feeding means through the printing means, the second edge is fed to the second paper feeding means.
The paper feeding means transfers the paper by a predetermined length to the downstream side and sets the paper.

When the above-mentioned paper is set and the paper is forwardly fed in accordance with the printing on the paper, the second paper-feeding means located on the downstream side of the printing means is arranged at the effective position. Is driven in the normal direction, so that the paper is fed forward without sagging.

When the paper is fed backward, the first paper feeding means upstream of the printing means is placed at the effective position, and the first paper feeding means is driven in reverse, so that the paper does not sag. Sent back.

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS.

In FIG. 1 showing a printer mainly used for a register from a side view and FIG. 2 showing a side section, a recording paper 2 wound in a roll shape is replaceably accommodated on the rear side of a printer main body 1. A paper holder 4 having a paper storage unit 3 for storing is attached.

A free roller 5 for guiding the drawn-out portion 2a of the recording paper 2 is rotatably arranged on the upper portion of the rear side surface of the left and right side frames 1a of the printer body 1.

Inside the printer body 1, a pair of guide plates for forming an upstream guide passage 6 and a downstream paper guide passage 7 for transferring and guiding the drawer portion 2a of the recording paper 2 respectively.
8, 9 and 10, 11 are arranged.

A platen 13 and a print head 14 which form the printing means 12 are arranged in a facing manner with a predetermined gap between the both paper guide passages 6 and 7. The carriage 53 having the print head 14 is reciprocated by a carriage moving mechanism using a carriage moving motor as a drive source while being guided by a guide shaft 15 parallel to the platen 13.

On the upstream side in the paper feeding direction with respect to the printing means 12, the first
Driving and driven feed rollers 17 and 18 forming the paper feeding means 16 are arranged so as to be able to come into contact with and separate from each other. The drive feed roller 17 is
It is rotatably arranged on the shaft of a drive roller shaft 19 which is installed between the side frames 1a of the printer body 1 so as to rotate integrally with the roller shaft 19. At the shaft end of the drive roller shaft 19, a gear 20
Is provided, and the gear 20 is meshed with the feed gear 22 via the first intermediate gear 21. Further, a large gear 23 is provided on the shaft of the feed gear 22, and this large gear 23 meshes with a small-diameter output gear 25 provided on the output shaft of the feed motor 24.

The driven feed roller 18 is supported by the side frame 1a of the printer body 1 via the movable arm 26 at a position facing the drive feed roller 17 so that the driven feed roller 17 can come in contact with and separate from the drive feed roller 17. The end of the movable arm 26 is swingably supported by the side frame 1a with a pin 27 as a fulcrum. And the movable arm
The driven feed roller 18 is rotatably arranged around a roller shaft 28 provided at the other end of 26. further,
The movable arm 26 is connected to the plunger 30 of the first electromagnetic solenoid 29 by a connecting pin 31. When the plunger 30 is pulled in by the excitation of the first electromagnetic solenoid 29, the movable arm 26 is rotated counterclockwise in FIG. 1, and as a result, as shown in FIG. 18 is arranged at the paper feed position where it is in contact with the drive feed roller 17. When the first electromagnetic solenoid 29 is in the non-excited state, the movable arm 26 is rotated clockwise by the biasing force of the spring built in the solenoid and the own weight of the movable arm 26, whereby the third electromagnetic solenoid 29 is rotated. As shown in the figure, the driven feed roller 18 is arranged at a non-paper feed position separated from the drive feed roller 17.

On the downstream side of the printing means 12 in the paper feeding direction, drive / driven feed rollers 33, 34 forming a second paper feeding means 32.
Is arranged so that it can come into contact with and separate from the first paper feeding means 16 independently. The drive feed roller 33 is the printer body 1
It is arranged on the shaft of a drive roller shaft 35 provided between the side frames 1a so as to be rotatable integrally with the roller shaft. A gear 36 is provided at the shaft end of the drive roller shaft 35, and the gear 36 is meshed with the feed gear 22 via a second intermediate gear 37. Further, the peripheral speed of the drive feed roller 33 is the first
The roller diameter or the number of teeth of the second intermediate sheave 37 is set so as to be appropriately higher than the peripheral speed of the drive feeding roller 17 of the paper feeding means 16.

The driven feed roller 34 of the second paper feed means 32 is supported by the side frame 1a via a support lever 38 at a position facing the drive feed roller 33 such that the driven feed roller 34 can come into contact with and separate from the drive feed roller 33. The support lever 38 is rotatably supported at the center thereof with the pin 39 as a fulcrum. A roller shaft 34a is installed at one end of the support lever 38, and the driven feed roller 34 is rotatably provided around the roller shaft 34a.
The support lever 38 is always arranged at the paper feed position where the driven feed roller 34 is in contact with the drive paper feed roller 33 by the elastic force of a spring (not shown). Further, the lever piece 40 at the other end of the support lever 38 is connected to the blanker 42 of the second electromagnetic solenoid 41 by a connecting pin 43, and an operating piece 44 is formed at the tip of the lever piece 40. And
The plunger 42 is pulled in by the excitation of the second electromagnetic solenoid, or by the manual operation by the operation piece 44,
As the support lever 38 is rotated counterclockwise in FIG. 1 against the biasing force of the spring, the driven feed roller 34 separates from the drive feed roller 33 as shown in FIG. It is supposed to be placed in.

Further, in this embodiment, a drive / driven paper forming a third paper feeding means 46 for transferring a single cut paper (validation paper, slip paper, etc.) 46 different from the roll-shaped recording paper 2 Feed rollers 47 and 48 are arranged between the first paper feeding means 16 and the printing means 12. The drive feed roller 47 of the third paper feed means 46 is rotatable on the drive roller shaft 49 provided between the side frames 1a integrally with the drive roller shaft 49, and as shown in FIG. In addition, the recording paper 2 is disposed on the left and right with a space wider than the paper width of the recording paper 2. A gear 50 that meshes with the first intermediate gear 21 is provided at the shaft end of the drive roller shaft 49.

The driven feeding roller 48 of the third paper feeding means 46 is the first feeding roller 48.
As shown in FIGS. 5, 5 and 6, the pressure arm
It is supported by the side frame 1a via 51. One end of the pressure arm 51 is rotatably supported by the side frame 1a with a support shaft 52 as a fulcrum. A roller shaft 48a is installed at the tip of the pressure arm 51, and right and left driven feed rollers 48 corresponding to the drive feed rollers are rotatably arranged around the roller shaft 48a.

Further, the pressure arm 51 is always urged by the spring in the counterclockwise direction in FIG. 1, and the driven feed roller 48 is driven by the driven feed roller 48 as shown in FIGS. 7 and 8.
It is designed to be placed at the paper feed position where it contacts 47.
Further, as shown in FIGS. 5 and 7, the pressure arm 51 is provided with a cam 55 which is detachably engaged with a cam 54 formed at a predetermined position of the carriage 53. And
As shown in FIG. 5, when the carriage 53 moves to the outside of the printing section, the pressure arm 51 rotates clockwise against the urging force of the spring by the cam action of the cams 54 and 55. The driven feed roller 48 is arranged at the paper insertion position separated from the drive feed roller 47 as shown in FIG.

In FIG. 9 which is a block diagram showing the control of the printer, the first and second electromagnetic solenoids 29 and 41, the feed motor 24, the print head 14 and the carriage movement motor 56 are shown.
Is connected to a control circuit 57 arranged on the main body side of the register. A keyboard 59, a character generator 60, etc. are connected to the control circuit 57.

 The first embodiment is configured as described above.

Therefore, when setting the recording paper 2, a paper setting key (not shown) arranged on the keyboard 59 is operated. When the operation signal of the sheet setting key is input to the control circuit 57, the first electromagnetic solenoid 29 is excited and the second electromagnetic solenoid 41 is kept in the non-excited state.

Movable arm by excitation of the first electromagnetic solenoid 29
26 is rotated counterclockwise, and the driven feed roller 18 of the first paper feed means 16 is arranged at the paper feed position where it is in contact with the drive feed roller 17. Further, when the second electromagnetic solenoid 41 is in the non-excited state, the support lever 38 is urged clockwise by the elastic force of the spring, so that the driven feed roller 34 of the second paper feeding means 32 is driven and fed. It is arranged at a paper feed position in contact with the roller 33.

In this way, when both the first and second sheet feeding means 16 and 32 are made effective, one end edge of the roll-shaped recording sheet 2 stored in the sheet storage section 3 is manually moved to a predetermined length. Then, the leading edge is inserted from the entrance of the upper edge side guide passage 6 to the first paper feeding means 16.

Here, a paper feed key (not shown) arranged on the keyboard 59 is operated. This paper feed key signal is the control circuit
When input to 57, the feed motor 24 is rotationally driven in the forward direction. Then, as shown in FIG. 2, the drive feed rollers 17 and 33 of the first and second paper feed means 16 and 32 and the driven feed rollers 18 and 34 that are in contact with them respectively rotate in the forward feed direction. To be done. The paper feed action of the drive / following rollers of the first paper feed means 16 causes the leading edge of the recording paper 2 to pass between the platen 13 and the print head 14 and the second paper feed means 32.
Transported to

When the pull-out edge of the recording paper 2 is transferred to the second paper feeding means 32 and is inserted into the driving and driven feed rollers 33 and 34, the paper feeding action of these both feeding rollers causes
The leading edge of the recording paper 2 is transported along the downstream paper guide passage 7.

Since the peripheral speed of the drive paper feed roller 33 of the second paper feed means 32 is set appropriately higher than the peripheral speed of the drive paper feed roller 17 of the first paper feed means 16, the first and second It is possible to positively prevent the occurrence of slack in the drawn-out portion 2a of the recording paper 2 between the paper feeding means 16 and 32.

In this way, when the pull-out edge of the recording paper 2 is forward-transferred by the predetermined length through the second paper feeding means 32,
The feed motor 24 is stopped. Almost at the same time, the first electromagnetic solenoid 29 is de-energized, the movable arm 26 is rotated to the original position by the urging force of the spring, and the driven feed roller 18 of the first paper feed means 16 is driven by the drive feed roller 17. It is arranged at a non-sheet feeding position which is separated from each other.

As shown in FIG. 3, by arranging the driven feed roller 18 of the first paper feed means 16 at the non-paper feed position, the first paper feed means 16 is invalidated, and the second paper feed means is Printing on the recording paper 2 is shown in the valid state. That is, when the print operation key arranged on the keyboard 59 is operated and the signal is input to the control circuit 57, the control circuit 57 drives the print head 14 and the carriage movement motor 56. In this print control, the control circuit 57 reads the corresponding dot pattern from the character generator 60 and drives the print head 14 based on the read dot pattern.

As described above, every time one line is printed on the recording paper 2, the feed motor 29 is intermittently driven positively, and the second paper feeding means 32 causes the drawn-out portion 2a of the recording paper 2 to be printed on the printing line pitch. Is intermittently transferred forward by the amount corresponding to.

Since the driving and driven feed rollers 33 and 34 which constitute the second paper feeding means 32 are located on the downstream side of the print head 14, the drawn-out portion 2a of the recording paper 2 does not sag in the printing means 12. It is kept in tension. Therefore, the recording paper 2
It is possible to prevent problems such as an excess or deficiency of the printing line pitch caused by the slack of the drawn-out portion 2a of the paper, and the print head 14 catching and damaging the slackened portion of the drawn-out portion 2a of the recording paper 2.

Next, when the recording paper 2 is transported in the reverse direction, the keyboard 59
Operate the reverse key (not shown). When the operation signal of the reverse feed key is input to the control circuit 57, both the first and second electromagnetic solenoids 29 and 41 are excited. By the excitation of the first electromagnetic solenoid 29, the driven feed roller 18 of the first paper feed means 16 is placed at the paper feed position where it is in contact with the drive feed roller 17. Further, by the excitation of the second electromagnetic solenoid 41, the driven feed roller 34 of the second paper feed means 32 is arranged at the non-paper feed position where it is separated from the drive feed roller 33.

Then, as shown in FIG. 4, when the first paper feed means 16 is enabled and the second paper feed means 32 is disabled, the feed motor 24 is reversely driven. Then, the recording paper 2 is reversely transported by the reverse feeding action of the driving and driven feeding rollers 17 and 18 of the first paper feeding means 16.

As described above, the first paper feeding means 16 arranged on the upstream side of the printing means 12 transfers the recording paper 2 in the reverse direction, so that the drawn-out portion 2a of the recording paper 2 sags in the printing means 12. Is prevented.

When the reverse feed key is released when the recording paper 2 is reversely transported by the desired length, the feed motor 24 is stopped and both the first and second electromagnetic solenoids 29 and 41 are de-energized. Then, the driven feed roller 18 of the first paper feed means 16 is arranged at a non-paper feed position separated from the drive paper feed roller 17, and the driven feed roller 34 of the second paper feed means 32 is set to the drive feed roller 33. The paper feed position is in contact with each other.

Next, when printing on a cut sheet 61 different from the roll-shaped recording sheet 2, first, a cut sheet insertion key (not shown) of the keyboard 59 is operated. When the operation signal of the cut sheet paper insertion key is input to the control circuit 57, the first electromagnetic solenoid 29 is kept in a non-excited state and the second electromagnetic solenoid 41 is excited. As a result, the driven feed rollers 18 and 34 of the first and second paper feed means 16 and 32 are arranged at the non-paper feed positions separated from the drive feed rollers 17 and 33. Also,
When the operation signal is input to the control circuit 57, the carriage moving motor 56 is driven, and the carriage 53 is moved to the outside of the printing section and stopped at that position, as shown in FIG. When the carriage 53 is moved to the outside of the printing section, the pressure arm 51 of the third paper feeding means 46 is moved by the cam action of the cams 54 and 55 arranged between the carriage 53 and the pressure arm 51. It is rotated against the elastic force of the spring and, as shown in FIG.
48 is arranged at a paper insertion position separated from the drive feed roller 47.

Then, from the paper insertion slot on the front side of the printer,
The cut sheet 61 is manually inserted into a predetermined position between the platen 13 and the platen 13, and between the driving and driven feeding rollers of the third sheet feeding means 46.

Here, the cut sheet paper printing operation key (not shown) of the keyboard is operated. When the operation signal is input to the control circuit 57, the control circuit 57 controls the carriage 53 and the print head.
14 is driven to print on the cut sheet 61.

With the movement of the carriage 53, as shown in FIGS. 7 and 8, the driven feed roller 48 of the third paper feed means 46 is arranged at the paper feed position where it is in contact with the drive feed roller 47. Then, every time one line is printed on the cut sheet 61, the feed motor 24 is intermittently driven positively, and the third sheet feeding means 43 causes the cut sheet 61 to correspond to the print line pitch. Only intermittently forward transfer is performed.

During the normal transfer of the cut-sheet paper 61, the driven rollers 18 and 34 of the first and second paper-feeding means 16 and 32 are arranged at the non-paper-feeding positions, so that the roll-shaped recording paper 2 is transferred. The problem does not occur.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the drive feeding roller 33 of the paper feeding means 32 for the roll-shaped recording paper 2 arranged on the downstream side of the printing means 12 is used.
And a drive feed roller 47 of the paper feed means 46 for single-cut sheets is selectively driven by the switching operation of the switching arm 62.

That is, a switching arm 62 is rotatably supported at the center of the feed gear 22 that is driven by the feed motor 24, and the switching gear 62 includes the feed gear 22.
Both first and second intermediate gears 21 and 37, which constantly mesh with 22, are rotatably supported. Further, the switching arm 62 is connected to the plunger 64 of the electromagnetic solenoid 63.

When the roll-shaped recording paper 2 is transferred, the electromagnetic solenoid 63 is kept in a non-excited state, and the switching arm is
62 is arranged in the first switching position shown by the solid line in FIG. 10 by the elastic force of the spring. At this time, the second intermediate gear 37 of the switching arm 62 meshes with the gear 36 of the drive feed roller 33 forming the paper feeding means 32 of the recording paper 2 to drive the same, while the first intermediate gear 21 is operated by the first intermediate gear 21. It is arranged so as to be separated from the gear 50 of the drive feed roller 47 which forms the paper feed means 46.

Further, when the cut sheet is transported, the electromagnetic solenoid 63 is excited and the switching arm 62 is arranged at the second switching position shown by the chain line in FIG. 10 against the elastic force of the spring. At this time, the first intermediate gear 21 of the switching arm 62
Is engaged with a gear 50 of a drive feed roller 47 which forms the paper feed means 46 for single-cut sheets and drives the same, while a second intermediate gear 37 forms a paper feed means 32 for the recording paper 2 and a drive feed roller 33.
It is designed to be separated from the gear 36 of the. Therefore, in the second embodiment, a structure for bringing the driven feed roller 34 into and out of contact with the drive feed roller 33 of the roll-shaped recording paper 2 becomes unnecessary.

(Effect of the Invention) According to the present invention, when a sheet is inserted from the upstream side of the printing means through the printing means and set, the switching operation of the first and second switching means causes the first upstream side of the printing means.
When the first paper feeding means and the second paper feeding means on the downstream side are both placed at effective positions, the first and second paper feeding means are driven in the normal direction, thereby the first paper feeding means. After the edge of the paper supplied to the paper is transferred to the second paper feeding means through the printing means, the paper can be set by being moved to the downstream side by a predetermined length by the second paper feeding means. . Therefore, it is possible to easily set the paper in the printer.

When the paper is set and the paper is fed forward along with the printing on the paper, the second paper on the downstream side of the printing means is used.
By driving the second paper feeding means in the forward direction with the paper feeding means in the effective position, the paper can be forwarded without sagging. Therefore, it is possible to prevent the print line pitch from being excessive or insufficient due to the slack of the paper.

Further, when the paper is fed backward, the first paper feeding means upstream of the printing means is arranged at the effective position, and the first paper feeding means is driven in reverse, so that the paper does not sag. Can be sent back.

[Brief description of drawings]

1 to 9 of the drawings show Embodiment 1 of the present invention. FIG. 1 is a side view showing a printer for a register in a partially cutaway manner, and FIG. 2 is a case where recording paper is set. FIG. 3 is a side sectional view showing the arrangement of the rollers, FIG. 3 is a side sectional view showing the arrangement of the rollers when printing on the recording paper, and FIG. 4 is an arrangement of the rollers when the recording paper is fed backward. Side sectional view, fifth
6 and 6 show a state in which a cut sheet is inserted into the third paper feeding means, FIG. 5 is a plan view of the third paper feeding means, FIG. 6 is a side sectional view, FIGS. 7 and 8 show a state in which printing is performed on cut-sheet paper. FIG. 7 is a plan view of the third paper feeding means, FIG. 8 is a side sectional view, and FIG. 9 is a printer drive. FIG. 10 is a block diagram showing a control circuit, and FIG. 10 is a side view schematically showing a second embodiment of the present invention. 2 …… Recording paper 12 …… Printing means 13 …… Platen 14 …… Print head 16 …… First paper feeding means 17 …… Drive feed roller 18 …… Driven feed roller 24 …… Feed motor 29 …… First Electromagnetic solenoid 32 …… Second paper feeding means 33 …… Drive feed roller 34 …… Driven feed roller 41 …… Second electromagnetic solenoid 57 …… Control circuit

Claims (1)

(57) [Scope of utility model registration request] 1. A first printer is provided upstream of a printing means in a paper feeding direction.
The second paper feeding means is provided on the downstream side of each of the paper feeding means, and the paper is forwardly fed from the upstream side to the downstream side by driving these paper feeding means in the forward direction, and the reverse driving is performed. In a printer that reversely feeds a sheet from a downstream side to an upstream side by means of a first switching means for switching the paper feeding action of the first paper feeding means to valid or invalid, and a paper feeding of the second paper feeding means. Second switching means for switching the operation between valid and invalid, and the first switching means for inserting the paper from the upstream side of the printing means.
And the second switching means to enable the paper feeding action of the first and second paper feeding means, and to drive the first and second paper feeding means in the forward direction to print the paper after the insertion. When the sheet is forward-fed by means of at least the second switching means, the second sheet-feeding means is enabled, and the second sheet-feeding means is normally driven to reversely feed the sheet after the insertion. A printer, comprising: a control unit that activates the first paper feeding means by a first switching means and reversely drives the first paper feeding means.