JP2569701B2 - Printer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer capable of easily exchanging roll paper in a state where an opening / closing member is opened in a paper storage portion of a printer body. .

(Prior Art) Conventionally, printers of this type include, for example,
There is one disclosed in JP-A-59-35410.

That is, in this case, a paper storage unit, a print head, and a feed roller are disposed on the printer main body side, and a tension roller and a platen that press against the feed roller are mounted on a cover side that is openably and closably mounted on the paper storage unit of the printer main body. And are arranged. Further, the feed roller and the tension roller are provided between the paper storage unit and the print head.

(Problems to be Solved by the Invention) By the way, in the case where a feed roller and a tension roller that perform a paper feeding operation are provided between a paper storage unit and a print head, paper feeding by the feed roller and the tension roller is performed. When the sheet is transported toward the print head by the action, "slack" occurs in the sheet on the downstream side in the sheet feeding direction of each roller. Especially,
When the paper is transferred from below to above with respect to the print head as in the printing apparatus disclosed in the above publication, "slack" is likely to occur.

When the paper is sagged, not only is there an excess or shortage in the interval between print lines on this paper, but also "sag"
Is generated between the print head and the platen, the leading end of the print head is caught in the slack portion of the sheet, and the sheet is damaged.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an object of the present invention is to provide a function that enables easy exchange of roll-shaped paper into a paper storage unit of a printer body and that can print on cut-sheet paper such as slip paper. It is another object of the present invention to provide a printer capable of preventing the occurrence of "slack" of rolled paper.

(Means for Solving the Problems) In order to solve the above-mentioned conventional problems, the present invention provides:
A printer body, and an opening / closing body attached to the paper storage section of the printer body so as to be openable and closable, wherein a pull-out portion of the roll-shaped paper stored in the paper storage section is provided on either the printer body side or the opening / closing body side. Or a printer that feeds paper between a print head provided on one side and a platen provided on the other side. A pair of feed rollers for transferring the rolled paper, one of which is provided on the opening / closing body side and the other of which is supported on the printer main body side, which is provided at a position allowing insertion of cut sheet paper between the printer and the platen. And moving the other feed roller from a paper feed position that is rotatable in contact with the one feed roller to a retracted position that does not hinder the opening / closing operation of the opening / closing body. And a retracting means for causing.

(Operation) In the printer configured as described above, the roll-shaped paper is exchanged for the paper storage unit with the opening / closing body attached to the paper storage unit of the printer body being opened.

By closing the opening / closing body in a state where the roll-shaped paper is pulled out to a predetermined length, the drawn-out portion of the paper is passed between the print head and the platen and between the pair of feed rollers.

In particular, since the pair of feed rollers for transferring the roll-shaped paper are disposed on the downstream side of the print head and the platen in the paper feed direction, the drawing-out portion of the roll-shaped paper between the print head and the platen is “slack”. Can be positively prevented.

Further, since the pair of feed rollers is disposed at a position allowing insertion of the cut sheet between the print head and the platen, printing can be performed on the cut sheet.

Moreover, when opening the opening / closing body provided with one feed roller, the other feeding roller provided on the printer body is moved by the evacuation means to a retracted position which does not hinder the opening / closing operation of the opening / closing body. Does not hinder the opening of the body.

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

In FIG. 1 showing a printer mainly used for a register in a side view, FIG. 2 showing a plan view, and FIG. 3 showing a side cross section, a printer 1 mainly includes a printer main body 2 and an opening / closing body 12. I have.

A paper holder 4 is mounted on the rear side of the main body frame 3 of the printer main body 2. In the paper holder 4, each paper storage section 5 having an upper opening for storing the receipt paper P1 and the journal paper P2 wound up in a roll shape in parallel on the left and right sides is partitioned and formed with a partition wall. Further, the paper holder 4 has a guide plate 6 for guiding the drawn-out portion of each roll-shaped paper P1, P2 stored in each paper storage unit 5 toward a print head 8 described later. Has been extended.

A feed cam shaft 7 is rotatably provided 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 cam shaft 7. When 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 reciprocally slid in the axial direction. The feed cam shaft 7 is connected to a carriage drive motor 11 via a gear train 10 as shown in FIG.

An opening / closing body 12 is supported above the left and right side walls 4a of the paper holder 4 at one end of the left and right side walls 12a so as to be openable and closable with a support pin 13 as a fulcrum. Has been energized. On the other end (free end) side of both side walls 12a of the opening / closing plate 12, a platen 15 in the form of a vertical plate is mounted at a position facing the print head 8. As shown in FIG. 3, upper and lower guide plates 16 and 17 for guiding the drawn-out portions of the roll-shaped paper P1 and P2 respectively extend from the paper feed side and the paper feed side of the platen 15. The guide plate 16 on the paper feed side of the platen 15 faces the guide plate 6 of the paper holder 4 to form a paper feed passage.

A paper feed side of the print head 8 and the platen 15,
That is, on the downstream side, the printer body 2 side and the opening / closing body 12
A pair of right and left drive / following feed rollers 18 and 19 for transporting the rolled paper P1 and P2 are respectively arranged on the left and right sides. Further, as shown in FIG. 3, the drive / following feed rollers 18, 19 are vertically moved above the platen 15 on the opening / closing body 12 side with respect to the extended surface of the gap between the print head 8 and the platen 15. Facing. Then, the insertion of the cut sheet (validation sheet, slip sheet, etc.) P3 from above into the gap is allowed without being hindered by the drive / following feed rollers 18,19.

That is, in this embodiment, as shown in FIG. 4, a roller shaft 20 is provided on the free ends of the left and right side walls 12a of the opening / closing body 12, and each of the roll-shaped papers is wound around the roller shaft 20. Left and right drive feed rollers 18 corresponding to P1 and P2 are rotatably fitted. Then, these two drive feed rollers 18
Is exposed through an opening window formed between the platen 15 and the upper guide plate 17 thereabove. Further, as shown in FIG. 4, both drive feed rollers 18 have bevel gears 18a formed on their opposing surfaces, respectively.
The rotation of the drive gear 21 integrally formed with the bevel gear 21a meshing with 8a rotates both drive feed rollers 18 around the roller shaft 20. As shown in FIG. 4, a feed motor 22 for the drive gear 21 is mounted on a connection frame 12b integrally connecting the free ends of the left and right side walls 12a of the opening and closing body 12. An output gear 22a of the feed motor (stepping motor) 22 is meshed with the drive gear 21. Each drive feed roller 18
Between the bevel gear 18a, a one-way clutch (not shown) having a different allowable rotation direction is provided, and when the feed motor 22 rotates in the forward direction, one drive feed roller 18a is rotated.
(For example, only the lower side in FIG. 4) rotates, and only the other drive feed roller 18 (upper side in FIG. 4) rotates by the reverse rotation.

At the rear upper end of both side walls 3a of the main body frame 3, a first
As shown in the figure, a support wall 3b extending upward is formed, and a movable roller shaft 24 extends along the long hole 23 in the vertical direction extending through the upper portion of both support walls 3b. It is supported so that it can move up and down. On the axis of the movable roller shaft 24, both left and right driven feed rollers 19 are rotatably fitted so as to face the respective drive feed rollers 18. These two driven feed rollers 19 are always urged by a spring 25 toward a paper feed position in which the driven feed roller 19 moves to the lower part of the long hole 23 integrally with the movable roller shaft 24. At this paper feed position, the driven feed roller 19 rotates in contact with the drive feed roller 18 so as to perform the paper feed action.

Further, in the retracted position where both the driven rollers 19 move to the upper part of the elongated hole 23 integrally with the movable roller shaft 24, the driven roller 19 escapes to the outside of the opening / closing locus of the opening / closing body 12 so as to allow the opening / closing of the opening / closing body 12 without being hindered. It has become.

At the rear of the left and right side walls 3a of the body frame 3,
As shown in FIG. 1, a lock operation lever 26 for removably locking the opening / closing body 12 at a closed position is rotatably supported at its lower portion with a support pin 27 as a fulcrum. The lock operation lever 26 is provided with a lock claw 26a which is removably engaged with a lock pin 28 protruding from a free end of the outer side surface of both side walls 12a of the opening / closing body 12. The lock operation lever 26 is always pressed by its lock claw 26 by a spring (a tension coil spring in this embodiment) 29.
a is urged in the lock direction to engage with the lock pin 28. Further, 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. And lock operation lever 26
An operation piece 26b for rotating the lock operation lever 26 in the unlock direction is formed at the upper end of the lock lever 26.

In particular, in the first embodiment, the lock operation lever 26
By disposing the driven feed roller 19 at the lock position, the driven feed roller 19 is disposed at the paper feed position, and by rotating the lock operation lever 26 to the unlock position, the driven feed roller 19 is moved to the retracted position in conjunction with this. It is designed to be placed. That is, the driven lower 19 is provided above the lock operation lever 26.
The shaft end of the movable roller shaft 24 is movably fitted to form an elongated cam hole 30. The cam hole 30 is formed in an oblique or curved shape in which the distance from the support pin 27 of the lock operation lever 26 is gradually increased from one end to the other end. When the lock operation lever 26 is at the lock position, a movable roller shaft is attached to one end of the cam hole 30.
24, and the driven feed roller 19 of the roller shaft 24 is arranged at the paper feed position. Further, by rotating the lock operation lever 26 in the unlocking direction, the movable roller shaft 24 is moved up along the elongated hole 23 of the main body frame 3 while being pushed up by the cam surface of the cam hole 30, and the lock operation lever
By rotating 26 to the unlock position, the driven feed roller 19 is arranged at the retracted position.

The lock operation lever 26 has an engagement hole 31 formed continuously with the other end of the cam hole 30. 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 urging force of the spring 29. The driven feed roller 19 is held at the lock position, and the driven feed roller 19 is held at the retracted position against the urging force of the spring 25.

In the first embodiment, the roller support groove having an upper opening is formed between one side wall 12a and the intermediate wall 12b of the opening / closing body 12.
32 is formed in a notch shape. And the roller support groove
In 32, a take-up roller 33 for winding the journal paper P2 sent from the drive / following feed rollers 18 and 19 by an amount corresponding to the feed length is rotatable on its roller shaft 34 and It is detachably supported together with the roller shaft.

The take-up roller 33 is connected to one drive feed roller 18 via a belt mechanism 35, as shown in FIGS. The belt mechanism 35 includes two drive and driven pulleys 36 disposed on the inner surface of one side wall 12a of the opening / closing body 12.
37, and an endless belt 38 stretched between the pulleys 36 and 37.

As shown in FIG. 4, the drive pulley 36 is formed with a gear 36a that meshes with a gear 18a formed on the drive feed roller 18. Further, the driven pulley 37 has a take-up roller
A gear 37a meshing with a gear 34a formed on the roller shaft 34 of the 33 is formed. Then, at the time of paper feeding in which the drive feed roller 18 is rotationally driven by the feed motor 22, the torque of the drive feed roller 18 is transmitted to the roller shaft 34 of the winding roller 33 via the belt mechanism 35. In addition, the roller shaft
The torque transmitted to the roller
Within the range of the frictional force between the journal P33 and the take-up roller 33, the take-up roller 33 takes up the withdrawal edge of the journal P2 by an amount corresponding to the feed amount of the journal paper P2 by the drive feed roller 18 within the range of the frictional force. It has become.

Further, in this embodiment, an arc-shaped sector gear 39 centering on the support pin 13 of the opening / closing body 12 is formed on one side wall 4a of the paper holder 2 of the printer main body 2. The sector gear 39 is a gear of the driven pulley 37 of the belt mechanism 35.
37a so as to be able to be disengaged, and as shown in FIG.
When the gear 2 is in the open position, it is formed at a position where the gear 2 is disengaged from the gear 37a. Further, when the opening / closing body 12 is opened by a predetermined amount from the closed position, the gear 37a and the sector gear 39 are opened.
With the opening of the opening / closing body 12 thereafter, the roller shaft 34 of the winding roller 33 is rotated in the rewinding direction, and conversely, by closing the opening / closing body 12 at the opening position, The roller shaft 34 rotates in the winding direction.

The first embodiment is configured as described above. Therefore, at the time of paper feeding in which the feed motor 22 operates, the drive feed roller 18 is driven to rotate in the paper feed direction, and the rotation of the drive feed roller 18 and the driven feed roller which rotates in contact therewith.
Due to the paper feeding action of step 19, each of the rolled sheets P1, P2 is pulled out by a predetermined length.

The driving / following feed rollers 18 and 19 are connected to the print head 8.
In addition, since it is disposed on the downstream side of the platen 15 in the paper feeding direction, it is possible that “slack” occurs on the upstream side and the downstream side of the print head 8 and the draw-out portion of each roll-shaped paper P1, P2 with respect to the platen 15. Is prevented.

After the papers P1 and P2 are fed, the print head 8 is driven based on print data output from a print head driving device built in the register, and the same printing is performed on each of the rolled papers P1 and P2. Done.

When the rolled sheets P1 and P2 are inserted between these rollers, the drive / following feed rollers 18 and 19 move between the print head 8 and the platen 15 from above the cut sheet paper. P3 can be inserted, that is, it is vertically arranged on the opening / closing body 12 side of the insertion path of the cut sheet P3. Therefore, as shown in FIG.
Side, between the print head 8 and the platen 15,
By inserting the cut sheet P3 from above, printing can also be performed on the cut sheet P3.

Next, when exchanging each roll-shaped paper P1, P2, the first
As shown in the figure, when opening the opening / closing body 12 in the chain closed state, first, as shown in FIG. 5, the lock operation lever 26 is turned in the unlock direction against the urging force of the spring 29, as shown in FIG. . Then, the movable roller shaft 24 of the driven feed roller 19 moves along the long hole 23 of the main body frame 3 while being pushed up by the cam surface of the cam hole 30 of the lock operation lever 26 against the urging force of the spring 25. Moved up. Then, when the lock operation lever 26 is rotated to the unlock position, the driven feed roller 19 together with the movable roller shaft 24 is disposed at a retreat position beyond the range of the opening / closing locus of the opening / closing body 12.

When the lock operation lever 26 is rotated to the unlock position, the engagement between the lock claw 26a of the lever 26 and the lock pin 28 of the opening / closing body 12 is released, and the opening / closing body 12 is The fulcrum is opened. Then, in a state where the opening / closing body 12 is opened, the exchange of the roll-shaped sheets P1 and P2 into the sheet storage section 5 of the paper holder 4 is performed.

The pull-out edges of the roll-shaped paper sheets P1, P2 placed in the paper storage section 5 of the paper holder 4 are drawn out along the open platen 15 of the opening / closing body 12 and the guide plates 16, 17 above and below it. The pull-out edge of the journal paper P2 among the roll-shaped papers P1 and P2 is a winding roller of the opening / closing body 12.
Locked to the outer circumference of 33.

After pulling out each roll-shaped paper P1, P2 as described above,
The opening / closing body 12 is closed to the closed position. Here, when the lock operation lever 26 is rotated to the lock position, the lock claw 26a of the lever 26 engages with the lock pin 28 of the open / close body 12, whereby the open / close body 12 is locked at the closed position.

When the lock operation lever 26 is rotated to the lock position, the driven feed roller 19 is lowered by the cam hole 30 of the lever 26 along with the movable roller shaft 24 along the elongated hole 23 of the main body frame 3. The driven feed roller 19 is disposed at a paper feed position where the driven feed roller 19 protrudes into the opening / closing locus of the opening / closing body 12 and comes into contact with the drive feed roller 18 via the respective roller-shaped sheets P1 and P2. The paper is biased and held at the paper feed position by the elastic force.

As described above, the opening / closing body 12 is closed and the lock operation lever 26 is closed.
Is arranged in a lock position and the opening and closing body 12 is held in a closed position, so that as shown in FIG.
The drawer portion 2 is passed between the print head 8 and the platen 15 and set between the drive and driven feed rollers 18 and 19. Therefore, the work of replacing each of the rolled sheets P1 and P2 becomes extremely easy.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. 7 and 8. In the second embodiment, a swing arm 40 is attached to the upper part of both left and right support walls 3b of the main body frame 3 so as to be centered on a pin 41 at the base end thereof. The movable roller shaft 24 of the driven feed roller 19 is provided. Therefore, in the second embodiment, as shown in FIG. 8, by rotating the lock operation lever 26 in the unlock direction, the movable roller shaft 24 It is rotated upward with the pin 41 as a fulcrum, and is arranged at a retracted position beyond the range of the opening / closing trajectory of the opening / closing body 12. Other parts are almost the same as those in the first embodiment, and the description thereof is omitted.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, a lock lever 43 for locking the opening / closing body 12 to the closed position with respect to the printer main body 2 and an operation lever 45 for unlocking the lock lever 43 are formed by separate members. The main body frame 3 is disposed at predetermined intervals on the front and rear portions on the outer surfaces of the left and right side walls 3a.

That is, a lock lever 43 is provided at the rear portion of the outer side surface of the left and right side walls 3a of the main body frame 3 at the lower end portion thereof.
Adhered rotatably with 44 as a fulcrum. At the upper end of the lock lever 44, a lock claw 43a that engages with the lock pin 28 of the opening / closing body 12 in a detachable manner is formed. And the lock lever 43 is always moved to its lock claw by the spring 47.
43a is urged in the locking direction to engage with the lock pin.

An operation lever 45 is mounted on the outer side surface of the left and right side walls 3a of the main body frame 3 at a position in front of the lock lever 43 at one end thereof so as to be rotatable around a pin 46 as a fulcrum. A movable roller shaft 24 is provided at the tip of the operation lever 45, and a driven feed roller 19 corresponding to the drive feed roller 18 of the opening / closing body 12 is rotatably disposed on the axis of the movable roller shaft 24. I have. The operating lever 45 is always
As a result, the driven feed roller 19 protrudes into the opening / closing locus of the opening / closing body 12 and is urged to the rotatable paper feed position in contact with the drive feed roller 18, and the operating lever 45 is pressed against the urging force of the spring 48. In FIG. 10, by rotating the movable roller shaft 24 by a predetermined amount in the evacuation direction in the counterclockwise direction, the driven feed roller 19 together with the movable roller shaft 24 is moved to the evacuation position beyond the range of the opening / closing trajectory of the opening / closing body 12. It is arranged to be.

Further, when the operation lever 45 is rotated in the evacuation direction and the driven feed roller 19 is disposed at the evacuation position, the lock lever 43 is rotated in the unlock direction in conjunction with the rotation of the operation lever 45. Operating lever 45 and lock lever 43
The interlocking pin 49 and the interlocking piece 50 are disposed so as to be able to approach and separate from each other.

Therefore, when the opening / closing body 12 is opened, the operation lever 45 is rotated in the evacuation direction, and the driven feed roller 19 is disposed at the evacuation position, whereby the lock lever 43 is interposed via the interlock pin 49 and the interlock piece 50. Is rotated in the unlocking direction, the lock claw 43a is disengaged from the lock pin 28, and the
Is released by the urging force of the spring 14. The other parts are almost the same as those in the first embodiment, and a description thereof will be omitted.

In each of the first, second, and third embodiments, the print head 8 is provided on the printer main body 2 side and the platen 15 is provided on the opening / closing body 12 side. The print head 8 may be provided on the opening and closing body 12 side.

Further, of the drive / following feed rollers 18 and 19, the drive feed roller 18 may be provided on the printer body 2 side, and the driven feed roller 19 may be provided on the opening / closing body 12 side.

(Effects of the Invention) As described above, according to the present invention, the roll-shaped paper is exchanged with respect to the paper storage portion of the printer body with the opening / closing body opened, and the roll-shaped paper is pulled out by a predetermined length. By closing the opening / closing body, it is possible to easily exchange the roll paper with the printer and set the paper.

In particular, since the pair of feed rollers for transferring the roll-shaped paper are disposed on the downstream side of the print head and the platen in the paper feed direction, the drawing-out portion of the roll-shaped paper between the print head and the platen is “slack”. Can be positively prevented. As a result, it is possible to prevent excessive or insufficient print line intervals on the rolled sheet due to the slack of the sheet, and to prevent the sheet from being damaged due to the print head being caught by the slack portion of the sheet.

Further, since the pair of feed rollers is disposed at a position allowing insertion of the cut sheet between the print head and the platen, printing can be performed on the cut sheet.

Moreover, when opening the opening / closing body provided with one feed roller, the other feeding roller provided on the printer main body is moved by the retracting means to a retracted position which does not hinder the opening / closing operation of the opening / closing body. It is possible to prevent the feed roller on the main body side from becoming an obstacle that hinders the opening of the opening / closing body.

[Brief description of the drawings]

1 to 6 show a first embodiment of the present invention. FIG. 1 is a side view of a printer, FIG. 2 is a plan view of the same, FIG. 3 is a side sectional view of the same, and FIG. FIG. 5 is a plan view showing a paper feed drive system, FIG. 5 is a side view showing a state where the lock operation lever is rotated in the unlocking direction, FIG. 6 is a side view showing a state where the opening / closing body is opened, and FIG. And FIG. 8 show Embodiment 2 of the present invention. FIG. 7 is a side view of the printer, FIG. 8 is a side view showing a state in which the opening / closing body is opened, and FIGS.
FIG. 10 shows a third embodiment of the present invention. FIG. 9 is a side view of the printer, and FIG. 10 is a side view showing a state where the opening / closing body is opened. DESCRIPTION OF SYMBOLS 1 ... Printer 2 ... Printer body 5 ... Paper storage part 8 ... Print head 12 ... Opening / closing body 15 ... Platen 18 ... Drive feed roller 19 ... Driven feed roller

Claims (1)

(57) [Claims] An image forming apparatus comprising: a printer main body; and an opening / closing body which is openably and closably mounted on a paper storage section of the printer main body. In a printer configured to feed a paper between a print head provided on one of the opening and closing sides and a platen provided on the other side, a downstream side in a paper sending direction with respect to the print head and the platen In order to transfer the roll-shaped paper supported on the opening / closing body side and the other on the printer main body side, the cut-sheet paper is provided at a position allowing insertion of cut sheet paper between the print head and the platen. The pair of feed rollers and the other feed roller do not hinder the opening / closing operation of the opening / closing body from a paper feed position rotatable in contact with the one feed roller. Printer, characterized in that a and retracting means for moving the avoided position.