JPH04249174A - Paper feed device for printer - Google Patents

Abstract

PURPOSE:To eliminate slack of paper without forcing a user to process with complicated operations of a key board. CONSTITUTION:A cover 50 is to be closed before it is used generally. A switch 51 is arranged at a position where the switch is turned on at closing of the cover 50. When the switch 51 is turned on, transfer of driving between a drive shaft of a downstream pin tractor 12 and a platen shaft is cut off by using a one-way clutch 22a. In this state, a paper feed motor 37 is rotated reversely. Then, although the downstream pin tractor 12 does not rotate, the platen 2 rotates in the direction of returning a continuous paper P, so that a tension is given to the paper between the platen 2 and the downstream pin tractor 12. That is, a proper tension will be given to the continuous paper P automatically by only the closing operation of the cover 50 without any other operation.

Description

[Detailed description of the invention]

0001

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

0002

BACKGROUND OF THE INVENTION The present applicant has filed patent applications for the technology related to the above-mentioned device in Japanese Patent Application No. 63-286546 and Japanese Patent Application No. 2-120831. In the former case, after setting the paper on the upstream tractor, the key operation rotates the pin tractor in the forward direction to feed the paper, the paper is set on the downstream pin tractor, and the key operation rotates only the upstream pin tractor in the reverse direction. It is something that is rotated. The latter type is configured to cut off power transmission between the platen and the tractor by placing the carriage in a predetermined position by operating a key or the like. As explained above, all of these devices start their operation by key operation or the like, and take up the slack in the paper between the two tractors.

0003

[Problem to be Solved by the Invention] However, with the above configuration, it is necessary to perform key operations as described above to take up slack in the paper, and although the operation is simplified compared to conventional devices, it is still difficult for the user to do so. The disadvantage was that it forced users to perform complicated operations. Therefore, there is a need for a configuration that can take up the slack in the paper without forcing the user to perform complicated operations such as key operations.

The present invention was made in response to the above-mentioned needs, and its object is to provide an apparatus that can automatically take up the slack in paper without requiring any special key operations.

[0005]

[Means for Solving the Problems] In order to achieve this object, the present invention includes a platen disposed along the width direction of the continuous paper on the transport path of the continuous paper, and a plurality of pins movable in rotation. and arranged on the downstream side and upstream side of the platen on the transfer path, respectively,
a pair of pin tractors capable of transporting the continuous paper as each pin moves based on the engagement between the respective pins and the feed holes of the continuous paper; a drive source capable of rotating in forward and reverse directions; and the drive source. a transmission mechanism that transmits the rotational motion of the pin tractor to both pin tractors; a clutch unit that turns on and off power transmission between the drive source and the downstream pin tractor; and a cover that covers the printing mechanism section in an openable and closable manner; A detection means for detecting the opening/closing of the cover, and an output from the detection means based on the closing of the cover operate to disengage the clutch means, and the continuous paper is moved only by the upstream pin tractor to the downstream side. The present invention is characterized by comprising a control means for controlling the drive source to rotate in the reverse direction so as to be pulled back in the opposite direction from the pin tractor toward the upstream pin tractor.

[0006]

[Operation] In the present invention having the above structure, the clutch means is disconnected by the output from the detection means based on the opening and closing of the cover. Therefore, power is transmitted to the pin tractor on the upstream side, but not to the downstream side. In this state, if the pin tractor is rotated in the opposite direction, the paper will be returned, but since no power is transmitted to the downstream side, the paper will not rotate until tension is applied to the paper. When tension is applied to the paper, the pin tractor on the downstream side also follows. If the rotation is stopped in this state and the clutch means is connected, the paper is stretched between both pin tractors without slack.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to the drawings.

First, a first embodiment will be explained based on the drawings.

As shown in FIGS. 1 and 2, a printer case 1
, a platen 2 is rotatably supported by a platen shaft 3 along the width direction of the continuous paper P on a transport path of the continuous paper P, and a platen gear 4 is fixed to one end of the platen shaft 3. A paper guide plate 6 rotatably supporting a plurality of paper press rollers 5 is disposed below the platen 2.
A print head 7 that can reciprocate along the platen 2 is disposed on the front side of the platen 2. 50 is a cover that covers the upper part of the print head 7 so that it can be opened and closed; 51 is a switch that detects the opening and closing; and 52 is a paper bail.

A downstream tractor unit 8 is disposed downstream of the platen 2 on the transport path of the continuous paper P. As shown in FIGS. 1 to 5, this tractor unit 8 includes a pair of left and right side plates 9 that are removably assembled to both ends of the platen shaft 3, and a transmission line that extends parallel to the platen 2 between the both side plates 9. A shaft 10 and a guide shaft 11, a pair of left and right downstream pin tractors 12 supported on both shafts 10 and 11 so as to be movable and adjustable in the width direction of continuous paper P, and both shafts 10 between both pin tractors 12. , 11 and a paper receiving plate 13 supported on them.

As shown in FIGS. 1 and 4, a part of both side plates 9 is provided with an assembly recess 9a that is assembled in correspondence with both ends of the platen shaft 3, and a support shaft is provided inside each side plate 9. A rotatable engagement lever 14 is provided around the engagement lever 14a. A tension spring 15 is hung on the engagement lever 14, and during assembly, the hook portion 14b at the tip is engaged with an engagement pin 16 provided on the printer case 1 due to the force of the spring. Also, when removing, the engagement lever 14 is pulled against the spring force of the tension spring 15.
is rotated to detach the hook portion 14b from the engagement pin 16.

As shown in FIGS. 1 to 3, each downstream pin tractor 12 is equipped with a tractor frame 17, and a driving pulley 18 and a driven pulley 19, which are rotatable together with the transmission shaft 10, are attached to the tractor frame 17. , both pulleys 18
, 19 is hung with a pin belt 20 having a plurality of pins 20a that can move around. As shown in FIG. 3, each pin 20a is engaged with a feed hole Pa of continuous paper P, and feed is applied to continuous paper P as each pin 20a rotates. Additionally, a paper holding plate 21 is attached to the tractor frame 17.
can be switched between a reclining position where the continuous paper P is held, as shown by the solid line in FIGS. 1 and 4, and an upright position, which allows the continuous paper P to be attached and removed, as shown by the two-dot chain line in the figure. It is provided.

A tractor gear 22 is provided at the end of the transmission shaft 10 on the outside of one of the side plates 9, and the gear 22 only allows forward rotation of the transmission shaft 10, that is, rotation in the direction of arrow A. However, a one-way clutch 22a such as a spring clutch is provided as a clutch means for preventing the reverse rotation. Further, an intermediate gear 23 rotatably supported by the side plate 9 is meshed with the tractor gear 22, and the tractor gear 22 and the platen gear 4 are meshed and connected via the intermediate gear 23. As shown in FIGS. 3 and 5, both ends of each gear 22, 23 and both shafts 10, 11 are covered with a cover 24 attached to the outside of both side plates 9.

On the other hand, as shown in FIGS. 1 and 2, an upstream tractor unit 25 is provided upstream of the platen 2 on the transport path of the continuous paper P. This tractor unit 25 includes a transmission shaft 26 and a guide shaft 27 that extend parallel to the platen 2 and are rotatably supported by the printer case 1, and both shafts 26 and 27 are movable and adjustable in the width direction of the continuous paper P. A pair of left and right upstream pin tractors 28 are supported.

Each upstream pin tractor 28 is constructed in substantially the same manner as the downstream pin tractor 12, and has a tractor frame 29.
a drive pulley 30 inserted onto the transmission shaft 26 via;
A pin belt 32 having a plurality of pins 32a that is movable in rotation is hung between the driven pulley 31 supported by the tractor frame 29. Also, tractor frame 2
9 is provided with a paper holding plate 33 that can be switched between a collapsed position and an upright position.

As shown in FIG. 1, a tractor gear 34 is fixed to the end of the transmission shaft 26 on the outside of one of the upstream pin tractors 28. Further, the tractor gear 34 is meshed and connected to the platen gear 4 via a pair of intermediate gears 35 and 36 that are rotatably supported by the printer case 1. Further, a motor gear 38 of a paper feed motor 37, which serves as a drive source capable of rotationally driving in forward and reverse directions, is meshed and connected to one of the intermediate gears 35.

In this embodiment, each of the gears 4, 22, 2
3, 34 to 36 constitute a transmission mechanism, and by driving the paper feed motor 37, its rotational motion is transmitted to the upstream and downstream pin tractors 28, 12.

Next, the electrical configuration of this paper feeding device is shown in FIG.
Explain according to the following.

This paper feeding device includes a microcomputer (hereinafter referred to as "microcomputer") 41 as a control means for controlling the operation of the paper feeding motor 37, and a control program for the paper feeding motor 37 is stored in advance in the microcomputer 41. ing. This microcomputer 41 also has a paper feed motor 3.
A forward feed switch 42 operated to rotate 7 in the forward direction.
A normal rotation signal is input from the input/output interface 43 through the input/output interface 43. Further, a signal from the detection switch 51 is input to the microcomputer 41 via the input/output interface 43.

Therefore, when loading the continuous paper P, the user operates the normal feed switch 42 while the continuous paper P is set with each pin 32a of the upstream pin tractor 28 engaged with the feed hole Pa at the leading end of the continuous paper P. Then, a normal rotation signal is input to the microcomputer 41, and based on this input signal, the microcomputer 41 drives the paper feed motor 37 to rotate forward by a predetermined amount in order to apply a predetermined amount of normal feed to the continuous paper P. As a result, the rotational motion is transmitted to the upstream and downstream pin tractors 28, 12 via the respective gears 4, 22, 23, 34-36, and each pin 32a2 of both pin tractors 28, 12.
0a is rotated in the forward direction, and the leading edge of the paper is sent in the forward direction from the upstream pin tractor 28 to below the paper bail 52 via between the platen 2 and the paper pressing roller 5.

Then, open the cover 50 and remove the platen (
2) manually or further by using the forward feed switch 42 so that the leading edge of the continuous paper P is aligned with the downstream pin tractor 1.
After normal feeding is performed to the extent that the pin 2 is set with a margin, the feed hole Pa at the tip is engaged with each pin 20a of the downstream pin tractor 12 and set. During this set,
Downstream pin In view of the fact that the pins 20a of the tractor 12 do not align with the feed holes Pa of the continuous paper P, the continuous paper P must be set with some slack, so the platen 2 and the downstream The continuous paper P is set with a slight slack between the pin tractors 12.

Thereafter, when the cover 50 is closed (S1 in FIG. 7), the output from the detection switch 51 causes the microcomputer 41 to rotate the paper feed motor 37 in the forward direction in order to first transport the continuous paper P by a predetermined amount in the forward direction. drive (Figure 7
S2). This forward transport is carried out in advance to prevent the continuous paper P from coming off the pin tractor 12 due to reverse feeding, which will be described later, even if the amount of continuous paper P that is attached to the downstream pin tractor 12 is small in the paper set described above. It should be transferred to. Subsequently, the microcomputer 41 reversely rotates the paper feed motor 37 by a predetermined amount in order to pull back the continuous paper P by a predetermined amount (S3 in FIG. 7). Thereby, the rotational motion is transmitted to the upstream pin tractor 28 via each gear 34, 35, 38. At this time, the power transmission to the downstream pin tractor 12 is interrupted by the one-way clutch 22a, only each pin 32a of the upstream pin tractor 28 is rotated in the opposite direction, and the continuous paper P is moved downstream only by the upstream pin tractor 28. side pin tractor 1
2 toward the upstream pin tractor 28 in the opposite direction. At this time, the pullback distance is such that the continuous paper P does not come off the downstream pin tractor 12, and the upstream pin tractor 28 is slightly reversed as the continuous paper P is pulled back, and is a distance that is equal to larger than the amount transferred. As a result, tension is applied to the continuous paper P and its slack is removed.

[0023] Then, in a state in which the paper slack etc. have been removed in this way, the microcomputer 41, following the above-mentioned reverse drive, drives the paper feed motor 37 in normal rotation by a predetermined amount again and stops it (S4 in FIG. 7). , has printing operation. This eliminates backlash between the gears 4, 22, 23, 34-36, and ensures engagement between the feed hole Pa of the continuous paper P and each pin 32a, 20a.

As described above, in this embodiment, the slack in the paper can be easily and reliably removed by simply closing the cover 50 to remove the slack in the paper when setting the paper. It should be noted that the operation of closing the cover 50 has conventionally been performed manually and does not place an additional burden on the user. Also, when paper slack is removed,
Uniform tension can be applied to the continuous paper P by the driving force of the paper feed motor 37, and the paper can be fed smoothly at all times.

Further, for example, an electromagnetic clutch may be provided in place of the one-way clutch 22a as the clutch means, and the electromagnetic clutch may be configured to allow or prevent rotation of the transmission shaft 10 of the downstream pin tractor 12. Further, in the embodiment described above, the downstream tractor unit 8 is described as being detachable, but it may be incorporated into the printer together with the upstream pin tractor unit. In this case as well, it is not necessary to accurately adjust the distance between both pin tractor units to meet the feed hole of the continuous paper and assemble the unit, and it is also possible to absorb expansion and contraction due to changes in the mechanism of the continuous paper. In addition, a part of the configuration may be changed as appropriate without departing from the spirit of the invention.

Next, a second embodiment will be explained. The cover and detection means of the second embodiment are not particularly different from those of the first embodiment, so a detailed explanation thereof will be omitted.

The center shaft 102 of the platen 101 is rotatably supported by a printer main body 103 (see FIG. 13), and a platen gear 104 (see FIG. 8) is fitted to the end of the center shaft 102. A platen gear 104 meshes with a motor gear 105 connected to a paper feed motor 150. A carriage 140 is placed in front of the platen 101 on guide shafts 143 and 145 so as to be movable along the platen 101. The carriage 140 is configured to move left and right along the platen 101 by driving a carriage motor 164, which will be described later. Further, a print head 106 and a ribbon cartridge 146 are placed on the carriage 140, and as the carriage 140 moves left and right,
The print head 106 moves left and right along the longitudinal direction of the platen 101 to perform printing operations.

On the other hand, a plurality of paper press rollers 108 are rotatably supported on a paper guide plate 107 provided below the platen 101, and between these paper press rollers 108 and the platen 101, a printing paper 110 is is now loaded. On the rear side of the platen 101, lower tractors 111 for transporting the printing paper 110 to the platen 101 are provided, one on each side. The lower tractors 111 on both sides are supported by a rectangular bar-shaped drive shaft 112 and a guide shaft 113 that extend parallel to the platen 101, and are adjustable in position in the width direction of the printing paper 110. A pin belt 116 is stretched between the drive pulley 114 fitted on the drive shaft 112 and the driven pulley 115 behind it, and a pin 116a on the outer periphery of the pin belt 116
The paper is fed by rotating the pin belt 116 while engaging sprocket holes 117 (see FIG. 8) on both side edges of the printing paper 110. The lower tractor 111 having such a configuration is driven by a well-known connecting member (none of which is shown) such as a gear train or a timing belt that interlocks with the rotation of the platen 101. On the other hand, above the platen 101, there is a printing paper 10 fed out from the platen 101.
1, a pull-up tractor 120 is provided, and this pull-up tractor 120 will be described below.

The pull-up tractor 120 is supported by a drive shaft 122 and a guide shaft 123 that are rotatably supported by the printer main body 103. In this example,
The drive shaft 122 is formed into a square rod shape, and a pair of left and right drive pulleys 124 (see FIG. 12) are fitted onto the drive shaft 122. On the other hand, a pair of left and right driven pulleys 125 are fitted to the guide shaft 123, and a pin belt 126 is stretched between each driven pulley 125 and each drive pulley 124, respectively. Then, while engaging the sprocket holes 117 on both side edges of the printing paper 110 with the pins 126a formed on the outer periphery of each pin belt 126, the pin belts 126 on both sides
The printing paper 110 is pulled out from the platen 101 by rotating the printer. Note that the pair of left and right drive pulleys 124 and driven pulleys 125 are connected to the drive shaft 122 and the guide shaft 123.
The pin belts 126 on both sides can be slid in the axial direction of the printing paper 11 by sliding.
It can be adjusted according to the width of 0.

Next, the pull-up tractor 120 having the above configuration
The gear train 127 that constitutes the connecting member that drives the will be explained based on FIG. 8.

This gear train 127 includes a platen gear 104 that rotates integrally with the platen 101, and a platen gear 104 that rotates integrally with the platen 101.
04, and this intermediate gear 128.
The drive gear 129 meshes with the drive gear 129. In this case, the intermediate gear 128 is rotatably supported by a shaft 130 horizontally fixed to the printer main body 103, as shown in FIG. On the other hand, the drive gear 129 is connected to the drive shaft 12
2 so as to be slidable in the left and right direction. In this case, since the drive shaft 122 and the fitting hole 129a of the drive gear 129 fitted therein are formed into substantially the same square shape, the drive gear 129 and the drive shaft 122 rotate integrally. , to rotate the pin belt 126. As shown in FIG. 9, a spring 132 is interposed between the drive gear 129 and the bearing 131, and the spring 132 urges the drive gear 129 to the left. The leftward limit position of this driving gear 129 is regulated by a pressing body 153 formed on a fork lever 157, which is a blocking member described later, and is a position shown by a solid line in FIG.
The drive gear 129 is in mesh with the intermediate gear 128. (Hereinafter, this position will be referred to as the connected state.) Drive gear 12
A fork lever 157, which is a cutoff member for cutting off the connection between the printer 9 and the intermediate gear 128, is supported by a support shaft 154 on the support stand 103a of the printer main body 103 so as to be rotatable about the support shaft 154. . A pin 155 is suspended from an end 156 of the fork lever 157 on the carriage 140 side. This pin 155 comes into contact with the carriage 140 when the carriage 140 moves leftward and reaches a predetermined position, and as the carriage 140 moves further leftward from the predetermined position, the pin 155
55 is moved to the left, and the fork lever 157 is rotated clockwise about the support shaft 154.

On the other hand, the fork lever 157 drive gear 12
A pressing body 153 is suspended from the end 151 on the 9 side. This pressing body 153 moves to the right as the fork lever 157 rotates clockwise, and slides the drive gear 129 to the right against the spring 132, as shown in FIG.
As shown by the two-dot chain line, the intermediate gear 128 is configured to be disconnected from the intermediate gear 128. This drive gear 129
When the carriage 140 is moved to the right, the fork lever 157 is rotated counterclockwise, and the pressing body 153 is moved to the left along with this rotation, so that the spring is released from the intermediate gear 128. The elastic force of 132 causes the driving gear 129 to slide to the left, so that the driving gear 129 and the intermediate gear 128 return to a connected state in which they mesh. In this embodiment, in order to facilitate sliding and separation of the drive gear 129 and the intermediate gear 128, both gears 129 and 128 are formed into a tapered gear shape as shown in FIG. gear 10
4 and the motor gear 105 are also formed into tapered gear shapes. Note that the counterclockwise rotation of the fork lever 157 is configured by an appropriate member (not shown) so that the pressing body 153 does not rotate beyond a position where the driving gear 129 and the intermediate gear 128 are maintained in a meshed state. ing.

As shown in FIG. 8, on the top surface of the pull-up tractor 120, a paper holding cover 137 for preventing the printing paper 110 from coming off the pin belt 126 is configured to be openable and closable with respect to the top surface of the pin belt 126. has been done. (For the pull-up tractor 120 on the left side, illustration of the paper holding cover 137 is omitted.) Note that FIG.
Similarly to the pull-up tractor 120, the lower tractor 111 shown in FIG. 2 is also provided with a paper holding cover (not shown).

Next, the drive mechanism of the carriage 140 will be explained with reference to FIG. 10.

In FIG. 10, the CPU 162 is connected to a carriage drive driver 163, and the carriage drive driver 163 drives a carriage motor 164 in accordance with instructions from the CPU 162. The carriage motor 164 is the carriage drive driver 16
3, the carriage 140 is moved left and right along the longitudinal direction of the platen 101. Further, a paper feed switch 170 is provided on the upper surface or the entire surface of the housing of the printer main body 103. The paper feed switch 170 is
The CPU 162 outputs a drive command to the paper feed driver 171 in accordance with the operation of the paper feed switch 170. The paper feed driver 171 drives the paper feed motor 150 according to instructions from the CPU 162, and the paper feed motor 15
0 drives the motor gear 105 and the platen gear 10.
4, the platen 101 is rotated in the direction of the arrow in FIG. And this platen 101
At the same time as the platen gear 104 and the intermediate gear 128 rotate,
, a drive shaft 122 connected to the platen 1 via a drive gear 129, and a drive shaft 112 connected to the platen 101 via an appropriate connection member such as a timing belt (not shown), respectively, in the direction of the arrow in FIG. It is designed to rotate. Therefore, by rotating the drive shaft 122 in the direction of the arrow and rotating the drive shaft 112 in the direction of the arrow,
The pin belts 126 and 116 are rotated in the directions of the arrows, respectively, and the lower tractor 111 and the pull-up tractor 120
The printer is configured to transport printing paper mounted on the pull-up tractor 120 from the lower tractor 111 via the platen 101.

Next, the operation of the paper feeding mechanism of the printer configured as described above will be explained with reference to FIG. 11.

When setting the printing paper 110, first guide the paper 110 to the pin belt 116 of the lower tractor 111, and align the sprocket hole 117 with the pin belt 116.
16 pin 116a (FIG. 12). and,
After covering both sides of the printing paper 110 with a paper holding cover (not shown) provided on the lower tractor 111, the paper feed switch 170 is operated to drive the paper feed motor 150, and the gear train described above is used to drive the paper feed motor 150. The platen 101, pin belt 126, and pin belt 116 are each rotated in the direction of the arrow. This platen 101 and both pin belts 126,
By the rotation of 116, the printing paper 11 is rotated as in the previous embodiment.
After the paper is fed until the tip of the paper can be attached to the pull-up tractor 120, the operation of the paper feed switch 170 is ended and the drive of the paper feed motor 150 is stopped. Next, the sprocket hole 117 of the printing paper 110 is engaged with the pin 126a of the pin belt 126, and the paper holding cover 1 is closed.
Cover with 37. In this state, the drive gear 129 of the pull-up tractor 120 is in a connected state with the intermediate gear 128 (the state shown by the solid line in FIG. 9), and the fork lever 15
7 is located in the state shown by the solid line in FIG. The cover 182 is closed, and the CPU 162 closes the detection switch 180.
When the CPU 162 detects the operation (S21), the CPU 162 first rotates the paper feed motor in the forward direction as in the above embodiment to ensure the amount of paper that is applied to the pull-up tractor (S21).
22). Next, the carriage 140 is moved once to the right in the same manner as the normal initial operation, and then moved to the left and stopped at the leftmost home position (S23, S
24). As the carriage 140 moves to the left, a portion of the carriage 140 comes into contact with a pin 155 formed on the fork lever 157, and the fork lever 157
is rotated clockwise around the support shaft 154. By rotating the fork lever 157 clockwise,
The pressing body 153 also moves to the right and presses the drive gear 129 to the right, causing the drive gear 129 to slide to the right against the spring 132, and the intermediate gear 128
The state is separated from the connected state (the state shown by the two-dot chain line in FIG. 9). In this state, the drive gear 129 and the drive shaft 122 are rotatable independently of the other gears 128, 104, 105 and the central axis 102 of the platen 101. In this state, the paper feed motor is rotated in the opposite direction (S25) as in the previous embodiment, and the continuous paper 1 is
Pull back 01. At this time, the drive gear 129 is separated from the intermediate gear 128, so even if the platen rotates, the pull-up tractor 120 does not rotate. Therefore, the slack in the printing paper 110 can be removed as in the embodiment. In this state, the carriage 140 is moved slightly to the right so that the drive gear 129 and the intermediate gear 128 mesh with each other (S26). Then, the paper feed motor is slightly rotated in the forward direction (S27) to eliminate backflush in the gear train in the forward direction, as in the previous embodiment.

[0038]

As is clear from the above detailed description, according to the present invention, the process of taking up the slack in the paper is automatically performed in conjunction with the opening and closing of the cover associated with setting the paper. Therefore, it has an excellent effect in that the user is not forced to perform extra processing such as key operations.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view of a paper feeding device according to a first embodiment.

FIG. 2 is a partially cutaway sectional view of the paper feeding device showing the pin belts of each pin tractor of the above device.

FIG. 3 is a front view showing a downstream tractor unit of the apparatus.

FIG. 4 is an ipsilateral view.

FIG. 5 is a partially cutaway sectional view showing the tractor gear and the like.

FIG. 6 is a block diagram of a circuit responsible for controlling the device.

FIG. 7 is a flowchart showing the content of the above control.

FIG. 8 is an exploded perspective view showing main parts of the second embodiment.

FIG. 9 is a vertical cross-sectional view of a peripheral portion of the connecting member of the device.

FIG. 10 is a block diagram of a circuit showing a carriage drive mechanism.

FIG. 11 is a flowchart showing control of the device.

FIG. 12 is an explanatory diagram of the entire apparatus.

FIG. 13 is an explanatory diagram of operations around the carriage.

[Explanation of symbols]

2 Platen 4 Platen gear 12 forming a transmission mechanism Downstream pin tractor 20a Pin 22 Tractor gear 22a forming a transmission mechanism One-way clutch 23 as a clutch means Intermediate gear 28 Upstream bin tractor 32a Pin 34 Tractor gear 35 forming a transmission mechanism Transmission mechanism Intermediate gear 36 constituting the transmission mechanism Intermediate gear 37 constituting the transmission mechanism Paper feed motor 41 as a drive source Microcomputer 50 as a control means Cover 51 Switch 101 constituting the detection means Platen 104 Platen gear 120 as a transmission mechanism Pull tractor 126a Pin 128 Intermediate gear 129 as a transmission mechanism Drive gear 150 as a transmission mechanism Paper feed motor 162 that constitutes a drive means
CPU as control means 180 Detection switch 182 Cover

Claims (1)

[Claims] 1. A platen disposed along the width direction of continuous paper on a transfer path for continuous paper, and a plurality of pins movable in rotation, and further downstream from the platen on the transfer path. and on the upstream side, and based on the engagement of each of the pins with the feed hole of the continuous paper,
a pair of pin tractors capable of transporting continuous paper as each pin moves; a drive source rotatable in forward and reverse directions; a transmission mechanism configured to transmit rotational motion of the drive source to the quantity pin tractor; A clutch means for turning on and off power transmission between a drive source and the downstream pin tractor, a cover coverably covering the printing mechanism section in an openable/closable manner, a detecting means detecting opening/closing of the cover, and a detecting means for detecting opening/closing of the cover; Based on the output from the detection means, the clutch means is operated to disengage, and the continuous paper is moved in the opposite direction from the downstream pin tractor to the upstream pin tractor using only the upstream pin tractor. A paper feeding device for a printer, comprising: control means for controlling the drive source to reversely rotate the paper so as to pull it back.