JPH0687242A - Paper change-over device in printer - Google Patents

Abstract

PURPOSE:To simplify an operation for changing over cutforms and continuous forms by operating a remote control key or an electric switch on a printer operation panel at a breath. CONSTITUTION:A carriage 31 driven by a carriage motor M1 is overtraveled beyond a maximum printing width. A rocking lever 29 as a clutch operation means is operated by a projected piece 33 of the carriage 31. In this manner, a paper feed motor M2 is connected to a change-over lever 11 as a paper supply selection means through a gear 26 serving as a clutch of the paper supply selection means. In this state, the paper feed motor M2 is driven to rotate the change-over lever 11. Furthermore, the actuating state of a roller holder device 3 and a tractor 4 forming a paper feed means is changed, and either cutforms or continuous forms are selected to be supplied. In this manner, paper can be automatically selected without providing a special drive source used for changing over paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a paper switching device for a printer.

[0002]

2. Description of the Related Art A continuous paper transport mechanism integrally formed with a printer and a sheet feeding device detachably attached to the printer are provided, and the mounting of the sheet feeding device is detected to continuously perform continuous feeding. A paper feeding device (see Japanese Patent Laid-Open No. 1-301345) that facilitates a paper feed switching operation from continuous paper to single-cut paper by a so-called paper parking function that retracts the leading end of the paper from the print head unit. It has both a paper feed mechanism and a cut paper feed mechanism, and the shaft output from the paper feed motor of the printer can be either a cut paper feed mechanism or a continuous paper feed mechanism by operating the manual lever. Switch to one side and connect it to the platen so that the paper feed roller for pressure-sensitive contact with the platen is brought into and out of contact with the platen, and the power of the tractor for continuous paper is disengaged. switching Sheet feeding apparatus so as to perform the printing operation Te (see JP Showa 62-134280)
Etc. are already known.

[0003]

However, in these conventional sheet feeding devices, the selection state of sheets is changed depending on whether the sheet feeding device is attached or not, and continuous paper and cut sheets are selected by manual operation of the manual lever. Since the switching was performed, even if the continuous paper transport mechanism, the cut sheet transport mechanism, and the paper parking function were combined, the operator switched the printer hardware to perform the paper switching operation itself. There was an annoyance that had to be done. Also, when switching the paper by manual operation of the manual lever, the contact and separation of the paper feed roller and the tractor and the engagement and disengagement operation are performed mechanically via the manual lever, so this lever operation requires a certain amount of force or more. Is required.
Therefore, an object of the present invention is to eliminate such a troublesome operation, and to perform a remote key operation by a personal computer or a word processor or the like connected to the printer, or one-touch of an electric switch on an operation panel provided in the printer. It is an object of the present invention to provide a paper switching device of a printer that can easily perform switching operation between cut paper and continuous paper by operation.

[0004]

A paper switching device for a printer according to the present invention comprises a paper feed selecting means for selecting either one of cut paper and continuous paper as a paper feed target and the selected paper as a print head portion. In a printer provided with a paper feeding means for feeding in, a paper feeding motor for paper feeding is connected so as to be freely contactable and separable via a clutch connected to the paper feeding selecting means, and a carriage driven by a carriage motor has a maximum print width. And a clutch operating means for detecting the overtravel position of the carriage and connecting the clutch to the side of the paper feed selecting means, and a carriage motor for receiving an electrical switching command. Each of the paper feed motors is provided with control means for outputting a movement command to the overtravel position and a drive command for paper selection. And achieve the object by the configuration to.

[0005]

When the operator inputs an electric switching command to the control means of the paper feeding device by remote operation from a personal computer or a word processor connected to the printer or by one-touch operation of an electric switch on the operation panel, the switching command is detected. The control means outputs a movement command to the overtravel position to the carriage motor, and moves the carriage driven by the carriage motor to the overtravel position. When the carriage moves to the overtravel position, the clutch operating means detects this and connects the paper feed motor to the paper feed selecting means. Then, in this state, the paper feed motor is operated by the output from the paper feed motor, and the paper feed is switched to one of the cut paper and the continuous paper.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a main part of the structure of a paper feeding device (hereinafter, simply referred to as a paper feeding device) 1 of a printer of an embodiment, and FIG. 2 is a side view showing the main part of the configuration of the paper feeding device 1.

The sheet conveying means of the sheet feeding device 1 is composed of a sheet conveying means for the cut sheet constituted by the platen 2 and the roller holder unit 3 and a sheet conveying means for the continuous sheet constituted by the tractor 4, and further. The paper transporting means and the paper transporting means are configured as a part of the paper feed selecting means for selecting either the cut paper or the continuous paper as the paper feeding target by the various members constituting the paper transporting means. There is a functional distinction between the selection means.

The drive sources of the platen 2 which constitutes a part of the sheet conveying means for cut sheets and the tractor 4 which constitutes the sheet conveying means for continuous paper are both constituted by a paper feed motor M2, and serve as a sheet conveying means. The platen 2 is rotated by the paper feed motor M2 via a gear 14 fixed to the platen shaft 13, a gear 15 rotatably supported by the printer body, and a gear 16 fixed to the motor shaft of the paper feed motor M2. The tractor 4 that is driven and serves as a sheet conveying unit is
The paper feed motor M2 is driven through a gear 17 fixed to the drive shaft of the tractor 4, a gear 18 rotatably supported on the printer body, and a gear 19 that works with a gear 14 fixed to the platen shaft 13. It is rotationally driven as a source. The gear 18 that transmits the rotation of the gear 19 to the gear 17 is slidably attached to the printer body in the axially supporting direction and is constantly urged by a spring 18a toward the right in FIG. A slide position is regulated by a tapered support surface 20 formed in a part of 11. The power transmission mechanism between the gear 19 and the gear 14 is not particularly shown.

Further, the roller holder unit 3 which constitutes a part of the sheet conveying means for single-cut sheets and the paper feed selecting means.
Is swingably mounted on a shaft 6 which is controlled to move up and down, and friction rollers 5 and 5'contacting the lower surface of the platen 2 are rotatably supported on the upper surface of the roller holder unit 3. A spring 7 that biases the roller holder unit 3 toward the platen 2 is fixed to a shaft 6 that is provided in the roller holder unit 3 and is fixed to the roller holder unit 3. Further, a substantially rectangular cam 9 having an engaging projection 8 is pivotally supported at one end of the shaft 6 via an arm 8a, and the outer peripheral portion of the cam 9 serves as a platen 2 and a roller holder unit 3. It is adapted to be in sliding contact with the protrusion 10 of the printer main body which is provided so as to protrude between the two.

The engaging projection 8 provided on the cam 9 has a switching lever 11 having a segment gear 25 at a part of a peripheral edge rotatably supported by the printer body about a rotation center 11 '(see FIG. 2). Is engaged with the engaging groove 12 of the switch lever 11, the engaging protrusion 8 is pushed by the engaging groove 12 in correspondence with the rotational position of the switching lever 11, and the cam 9 is rotated via the arm 8a, whereby the printer main body is rotated. The posture of the cam 9 with respect to the protrusion 10 changes.

The switching lever 11 is shown by the solid lines in FIGS.
Shows a state in which the cam 9 is tilted and the shaft 6 is close to the projection 10 at the position for feeding cut sheets. In this state, the friction roller 5 of the roller holder unit 3 fixed to the shaft 6 urged by the spring 7
5'presses against the platen 2, and the friction roller 5,
The cut sheet sandwiched between 5'and the platen 2 is sent in the sheet conveying direction as the platen 2 rotates. Further, in this state, the gear 18 is supported by the thin portion of the support surface 20 of the switching lever 11, and the sliding position of the gear 18 is maintained at the rightward movement limit in FIG. The mesh with 17 is released, and the continuous paper cannot be fed by the tractor 4. That is, the switching lever 11 forming a part of the paper feed selecting means is positioned at the cut sheet paper feeding position, the tractor 4 forming the paper conveying means for continuous paper becomes inoperable, and the paper feeding for cut paper is conveyed. Platen 2 and roller holder unit 3 as means
Is ready for operation.

On the other hand, when the switching lever 11 is in this state,
When rotated in the counterclockwise direction, the engaging projection 8 is pushed by the engaging groove 12 of the switching lever 11, and the cam 9 rotates clockwise about the shaft 6 via the arm 8a and is axially attached to the cam 9. The shaft 6 is separated from the protrusion 10 of the printer body,
A gap is created between the platen 2 and the friction rollers 5 and 5'provided in the roller holder unit 3 integrated with the shaft 6, and the function of the platen 2 for feeding cut sheets is canceled. Further, in this state, the gear 18 is pressed by the thick portion of the support surface 20 of the switching lever 11, and the thrust position of the gear 18 moves to the left in FIG. 1, so that the gear 18 and the gear 17 , And the continuous paper can be fed by the tractor 4. That is, the switching lever 1 that constitutes a part of the paper feed selection means
1 is located at the continuous paper feeding position, the platen 2 and the roller holder unit 3 as the paper transporting means for single-cut sheets are deactivated, and the tractor 4 constituting the paper transporting means for continuous paper is operable. It is in a state of becoming. It should be noted that the positions of the engaging projection 8, the engaging groove 12, the cam 9, the shaft 6, the roller holder unit 3, and the gear 18 when the switching lever 11 is rotated and positioned at the continuous paper feeding position are shown in FIGS. 2 to 8 ', 12', 9 ', 6',
It is shown by broken lines 3'and 18 '.

Whether the switching lever 11 as the paper feed selecting means is positioned at the single-cut paper feed position or the continuous paper feed position is determined by the arm 21 using the sensor 24 such as a photo interrupter provided on the printer main body side. It is detected by whether or not the light blocking member 23 at the tip is blocking. When the switching lever 11 is located at the cut sheet feeding position, the light-shielding member 23 is located within the detection range of the sensor 24, so the detection output from the sensor 24 is ON.
Is located at the continuous paper feed position, the light blocking member 2
Since 3 is out of the detection range of the sensor 24, the detection output is OFF.

Further, a segment gear 25 is formed on the outer peripheral portion of the switching lever 11 so as to mesh with a gear 26 rotatably supported by the printer body. The gear 26 that constitutes the clutch is attached to the printer body so that it can move in the thrust direction, and the spring 2
7, the slide position is regulated by one end of a swing lever 29 that is constantly urged rightward in FIG. 1 and is rotatably supported by the printer body via a support shaft 28.
The other end of the swing lever 29 that constitutes the clutch operating means is a pressing member 30 slidably attached to the printer body.
Of the pressing member 30, and the other end of the pressing member 30 is attached to a projecting piece 33 provided on a paper guide 32 of a carriage 31 (including a print head) which is driven in the axial direction of the platen 2 by a carriage motor M1. It is designed to engage.

FIG. 1 shows the carriage 31 overtraveling to the right beyond the maximum print width.
In this state, the protruding piece 33 of the paper guide 32 presses the pressing member 30 to the right, and the swing lever 29 engaged with one end of the pressing member 30 rotates clockwise to move the gear 26 to the left. Therefore, the rotation of the gear 14 driven by the paper feed motor M2 is transmitted via the gear 26 to the switching lever 1
1 is transmitted to the segment gear 25, and the switching lever 11
Is driven to rotate about a rotation center 11 '. Further, when the carriage 31 is located within the range of the maximum print width, the pressing force applied to the pressing member 30 is removed, and the swing lever 29 is allowed to freely rotate. Therefore, the gear 26 is biased by the spring 27. As a result, it moves to the right and disengages from the gear 14, and the rotation of the gear 14 is not transmitted to the switching lever 11. The positions of the swing lever 29 and the gear 26 when the carriage 31 is positioned within the maximum print width range are indicated by broken lines 29 'and 26' in FIG. The relationship between the maximum print width P1-P2 of the carriage 31 and the overtravel position P3 is shown in FIG.
As shown in.

FIG. 3 is a block diagram showing a main part of the printer control section 100 which also serves as the first, second and third motor control means and the selection state determination means in the paper feeding device 1.
The control unit 100 is generally provided with a microprocessor (hereinafter referred to as CPU) 104, a ROM 103 in which a control program and the like necessary for drive control of each unit of the printer main body and drive control of the sheet feeding device 1 are written, and data. Of the RAM 102 used for temporary storage of data and the like, and driver circuits 105 to 107 for the print head 31, the carriage motor M1, the paper feed motor M2, etc., and these elements are connected to the personal computer or the word processor 200. CPU 104 together with the interface 101 and sensor 24 used
Connected to the bus.

FIG. 5 is a flow chart showing an outline of the "switching detection processing" which is repeatedly executed by the task processing of the CPU 104 at a predetermined cycle. The processing operation of this embodiment will be described below with reference to this flow chart.

First, the CPU 104, which has started the "switching detection process" for each predetermined period, receives a paper switching command from a personal computer or a word processor 200 or a paper switching command from a key switch provided on the operation panel of the printer body. It is determined whether or not (step S1), but if the paper switching command is not input, the processing after step S2 is not executed and the "switching detection processing" of the processing cycle is ended. The determination process of step S1 in the "switching detection process" is repeatedly executed, and the input of the paper switching command is awaited. In the meantime, in another task process, a process relating to printing, paper feeding, etc. is executed in the same manner as in the conventional case, if necessary.

When a paper switching command is input from a key switch provided on the personal computer, the word processor 200 or the operation panel,
The CPU 104, which repeatedly executes the "switching detection process" for each predetermined cycle, detects the input of this signal in the determination process of step S1 and whether the output of the detection signal from the sensor 24 is ON, that is, It is determined whether the switching lever 11 is located at the cut sheet feeding position or the continuous sheet feeding position (step S2). As described above, when the output of the detection signal from the sensor 24 is ON, the switching lever 11 is positioned at the position for feeding the cut sheet,
If the output of the detection signal from the sensor 24 is OFF, it means that the switching lever 11 is located at the continuous paper feeding position.

If the result of the determination in step S2 is true, that is, if the switching lever 11 is currently in the single-sheet paper feeding position, the paper switching command input this time is the mode of the paper feeding device 1. It means that it is for changing from single-cut paper support to continuous paper support. In this case, the CPU 104 causes the message or symbol indicating the paper feeding mode newly selected by this command, for example,
Display data such as "continuous paper" is output to and displayed on the display means on the personal computer, the word processor 200, or the operation panel (step S3), and the form of the paper feeding device 1 is changed from single-cut paper compatible to continuous paper compatible. The processing for starting the operation will be started.

Therefore, the CPU 104 first starts the output of the distribution pulse as a movement command to the overtravel position P3 to the driver 106 of the carriage motor M1 for moving the carriage 31 along the platen 2 (step S4), and the pulse is outputted. It waits until the distribution is completed (step S5). Then, the pulse distribution is completed and the carriage 31
When is moved to the overtravel position P3, the protruding piece 33 provided on the paper guide 32 of the carriage 31 presses the pressing member 30 in the right direction in FIG. 1 to rotate the swing lever 29 in the clockwise direction to form the clutch. The segment gear 25 and the gear 14 of the switching lever 11 that serves as a paper feed selection unit are connected via the gear 26.

Next, the CPU 104 controls the paper feed motor M2.
The output of the forward rotation instruction, which is the drive instruction for selecting the continuous paper, is started to the driver 107 (step S6), and the sensor 24
Wait until the detection signal from is inverted (step S
7). At this stage, since the segment gear 25 of the switching lever 11 and the gear 14 are already connected via the gear 26, first, the gear 1 is rotated by the forward rotation of the paper feed motor M2.
6, the switching lever 11, which is a sheet feeding selection unit, rotates counterclockwise in FIG. 2 via the gear 15, the gear 14, the gear 26, and the segment gear 25 to separate the roller holder unit 3 from the platen 2 and the platen 2 The function of cutting paper feed by is canceled. Then, the paper feed motor M
When 2 further rotates, the gear 18 which is in sliding contact with the tapered support surface 20 of the switching lever 11 is guided by the support surface 20 and gradually moves to the left in FIG. The meshing of 17 allows the continuous paper to be fed by the tractor 4. That is, the release of the cut sheet function and the recovery of the continuous sheet feed function are not always performed at the same time.
Due to the relationship between the disposition position of the engagement groove 12 and the formation position of the support surface 20 in No. 1, the recovery of the function of continuous paper feeding is performed in time series.

Then, when the switching lever 11 is rotated to a predetermined angle, that is, to the position of continuous paper feeding, when the release of the cut sheet feeding function and the recovery of the continuous paper feeding function are completed,
The light-shielding member 23 at the tip of the arm 21 separates from the sensor 24, the detection signal from the sensor 24 is turned off, and the CPU 104, which has detected the inversion of the detection signal from the sensor 24 in the determination processing of step S7, detects that the paper feed motor M2 is positive. The rotation is stopped (step S8). In the case of this embodiment, part of the paper feed selecting means and part of the paper conveying means are shared by the platen 2, the roller holder unit 3, the tractor 4, etc., but when switching from single-cut paper to continuous paper, Since the cut sheet paper feeding function is canceled prior to the recovery of the continuous paper feeding function, and further, the driving of the paper feeding motor M2 is stopped immediately when the continuous paper feeding function is recovered, the continuous paper is not prepared. There is no such problem as feeding or jamming.

CPU in which the driving of the paper feed motor M2 is stopped
104 is the driver 1 of the carriage motor M1.
An original position return command is output to 06, the carriage 31 is returned to the home position, the pressing force on the pressing member 30 is removed, and the swing lever 29 is allowed to freely rotate.
The biasing force of the spring 27 moves the gear 26 to the right in FIG. 1 to release the meshing between the gear 26 and the platen gear 14, and the printing operation and the paper feeding operation are performed while the switching lever 11 is held at the continuous paper feeding position. Is started (step S9), the "switching detection process" is terminated, and the system waits until a normal command relating to printing, paper feeding, etc. is input.

When a command relating to printing, paper feeding, etc. is input, the CPU 104 controls the print head by the same processing as in the conventional case, and the carriage 31 driven by the carriage motor M1 is within the maximum print width range. Move
Moreover, the paper feed motor M2 is rotated by a predetermined amount for each line feed command, and the continuous paper is fed by the tractor 4. Gear 2
Since the meshing between 6 and the platen gear 14 has already been released at this stage, the rotation of the motor M2 is not transmitted to the switching lever 11. Further, since the message or symbol of the paper feeding mode displayed on the display means on the personal computer, the word processor 200 or the operation panel in the processing of step S3 is held as it is until the next paper selecting operation is performed, the operator Can easily know the type of the sheet currently selected by referring to the display means.

On the other hand, when the determination result of step S2 is false, that is, when the switching lever 11 is located at the continuous paper feeding position at the current stage, the paper switching command input this time is output from the paper feeding device 1. It means that the mode is to be changed from continuous paper compatible to single-cut paper compatible. In this case, the CPU 104 outputs a message or a symbol indicating the paper feed mode newly selected by this command, for example, display data such as “cut sheet” to the personal computer, the word processor 200, or the display unit on the operation panel. And display it (step S1
0), the tractor 4 is rotated in the reverse direction by the same process as the conventional one, and the continuous paper is returned to the standby position (step S11,
A process for changing the mode of the paper feeding device 1 (so-called paper parking function) from continuous paper compatible to cut paper compatible will be started.

Therefore, the CPU 104 first moves the carriage 31 to the overtravel position P3 by the same processing as in steps S4 and S5 described above, and after connecting the segment gear 25 of the switching lever 11 and the gear 14 (step). (S12, S13), output of a reverse rotation command, which is a drive command for selecting cut sheets, to the driver 107 of the paper feed motor M2 is started (step S14), and the sensor 24
Wait until the detection signal from is inverted (step S1
5). In this case, the reverse rotation of the paper feed motor M2 causes the switching lever 11, which is the paper feed selecting means, to rotate clockwise through the gear 16, the gear 15, the gear 14, the gear 26, and the segment gear 25 in FIG. The gear 18 that is in sliding contact with the tapered support surface 20 of 11 is guided by the support surface 20 and gradually moves to the right in FIG. 1 to disengage the gear 19 from the gear 19 and the gear 17, and the tractor 4 After the paper feed function by is released (continuous paper is held in the standby position as it is), the switching lever 11
The roller holder unit 3 is pressed against the platen 2 by the urging force of the spring 7 due to the change in the posture of the cam 9 due to the rotation of the plate 9, and the function of feeding the single-cut sheets by the platen 2 is restored.

Then, when the switching lever 11 is rotated to a predetermined angle, that is, to the position of the cut sheet paper feeding, when the release of the continuous paper feeding function and the recovery of the cut sheet paper feeding function are completed,
The light-shielding member 23 at the tip of the arm 21 blocks the sensor 24, and the detection signal from the sensor 24 is turned on.
The CPU 104, which has detected the inversion of the detection signal from the sensor 24 in the determination process of 5, stops the reverse rotation of the paper feed motor M2 (step S8).

Next, the CPU 104 outputs an original position return command to the driver 106 of the carriage motor M1 to return the carriage 31 to the home position, and as described above, the gear 26 and the segment gear 2 of the switching lever 11.
5 is released, the printing operation and the paper feeding operation can be started while the switching lever 11 is held at the cut sheet feeding position (step S9), and the "switching detection processing" is ended. Then, it waits for a normal command relating to printing, paper feeding, etc. to be input.

When a command relating to printing, paper feeding, etc. is input, the CPU 104 controls the print head by the same processing as in the conventional case, and the carriage 31 driven by the carriage motor M1 is within the maximum print width range. Move
In addition, the paper feed motor M2 is rotated by a predetermined amount for each line feed command, and the platen 2 and the roller holder unit 3 feed the cut paper. Similar to the above, step S1
The message or symbol of the paper feeding mode displayed on the display means on the personal computer, the word processor 200 or the operation panel by the processing of 0 is held as it is until the next paper selection operation is performed, so that the operator can display the display means. By referring to, it is possible to easily know the type of the sheet currently selected.

Hereinafter, every time the CPU 104 detects a paper switching command from the personal computer or the word processor 200 or a paper switching command from the key switch provided on the operation panel of the printer body, the output of the detection signal from the sensor 24 is turned on. Or not,
That is, it is determined whether single-cut paper feeding or continuous paper feeding is selected at the present stage, and either one of the processes of steps S3 to S7 or S10 to S15 is selectively performed. In step S8 to step S9, the paper selection switching operation is performed.

When switching the paper selection, the operator operates the CPU 1 via the interface 101 by operating the keys of the personal computer, the word processor 200 or the like.
It is not necessary to operate the manual lever on the printer side away from the personal computer or the word processor 200 as in the past, and to input the switch on the operation panel of the printer. Even when the switching operation is performed, the sheet feeding motor M2 provides all of the substantial labor required for operating the switching mechanism, so that the switching operation becomes very easy.

When the above-mentioned "switch detection processing" is performed by using a paper switching command from a personal computer or a word processor 200 or a paper switching command from a key switch provided on the operation panel of the printer as an interrupt signal, It is not necessary to perform this processing as task processing, and the processing of step S2 and subsequent steps may be started based on these interrupt signals.

[0034]

The paper switching device for a printer according to the present invention has a structure in which a carriage driven by a carriage motor can be overtraveled over a maximum print width, and the carriage operation can be performed by a clutch operating means having a simple mechanism. By detecting the travel position and switching the clutch, the paper feed motor for paper transport operates the paper feed selection means to select either single-cut paper or continuous paper as the paper feed target. Even if a special drive source for activating the paper selection means is not provided in the printer, it is possible to easily switch the selection of paper feed targets only by controlling the drive of the carriage motor and paper feed motor required for the configuration of the printer itself. You can Furthermore, since the control device required for such drive control can be configured by the microprocessor of the printer itself, an electric switch for inputting a switching command is provided on the operation panel of the printer, or a personal computer or By inputting a switching command by remote key operation using a word processor or the like, the paper switching operation can be completely automated. Therefore, it is no longer necessary for the operator to operate the manual lever for switching provided on the printer side away from the personal computer or word processor etc. as before, and to operate the electric switch on the operation panel to perform the switching operation. Even when it is performed, since the paper feed motor provides all of the substantial labor required to operate the paper feed selection unit, the switching operation itself becomes very easy.

[Brief description of drawings]

FIG. 1 is a plan view showing a main part of a configuration of a paper feeding device of a printer according to an embodiment of the present invention.

FIG. 2 is a side view showing a main part of the configuration of the paper feeding device of the printer in the embodiment.

FIG. 3 is a block diagram showing a main part of a printer control unit that also serves as first, second, and third motor control units and a selection state determination unit of the paper feeding device of the printer in the embodiment.

FIG. 4 is a maximum print width P1- of the printer in the embodiment.
The figure which shows the relationship between P2 and the overtravel position P3 of a carriage.

FIG. 5 is a flowchart showing an outline of “switching detection processing” in the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Paper feeding device of printer 2 Platen forming part of paper conveying means 3 Roller holder unit forming part of paper conveying means 4 Tractor forming part of paper conveying means 5, 5 ′ Friction roller 6 Shaft 7 Spring 8 Engagement Protrusions 8a Arms 9 Cams 10 Protrusions 11 Switching Lever Constituting Part of Paper Feed Selection Means 12 Engagement Grooves 13 Platen Shafts 14, 15, 16, 17, 18, 19 Gears 20 Supporting Surfaces 21 Arms 22 Spindles 23 Light-shielding member 24 Sensor (photointerrupter) 25 Segment gear 26 Gear wheel constituting clutch 27 Spring 28 Spindle 29 Swing lever constituting a part of clutch operating means 30 Pressing member constituting a part of clutch operating means 31 Carriage 32 Paper guide 33 Part of clutch operating means Protruding piece 100 Printer control unit that also serves as first, second, and third motor control means and selection state determination means 101 Interface 102 RAM 103 ROM 104 Microprocessor 105, 106, 107 Driver 200 Host computer including personal computer or word processor M1 Carriage motor M2 Paper feed motor

Claims (1)

[Claims] 1. A printer provided with a paper feed selecting means for selecting either one of a cut paper and a continuous paper as a paper feed target and a paper transporting means for feeding the selected paper to a print head portion. A paper feed motor is connected to the paper feed selection means via a clutch so that the paper feed motor can freely come into contact with and separate from the paper feed motor, and a carriage driven by a carriage motor is configured to be able to overtravel beyond the maximum print width, and the carriage can be overdriven. A clutch operating means for detecting the travel position and connecting the clutch to the paper feed selecting means, and a carriage motor and a paper feed motor each receiving an electric switching command for moving a command to an overtravel position and selecting a paper. And a control means for outputting a drive command for the sheet switching device of the printer.