JPH0781815A - Automatic continuous paper loading device - Google Patents

Abstract

PURPOSE:To facilitate and secure loading of continuous papers with the simple mechanism, and to improve the quality of printing. CONSTITUTION:A tractor 2, which is to be fitted in a feeding hole of a continuous paper 1 and which carries this continuous paper, is provided, and a paper feeding means 3 such as a paper supplying roller is provided in the upstream of the carrying direction of the tractor 2. A paper detecting means 4 for detecting the tip of the continuous paper 1, which is fed from the paper feeding means 3, is provided direct upstream of the tractor 2. When the tip of the paper is detected by this paper detecting means 4, a tractor control means 5 starts the drive of the tractor 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for automatically loading continuous paper onto a tractor provided in a continuous paper transport path, and more particularly to an apparatus for automatically loading continuous paper suitable for use in a printing apparatus for continuous paper. It is a thing.

[0002]

2. Description of the Related Art Conventionally, as a paper loading device used in, for example, a continuous paper printing device, a double tractor type one in which tractors are arranged in front of and behind the printing part (upstream side and downstream side), and a printing part An upper tractor type is known in which a tractor is arranged only on the downstream side of the.

An example of a paper loading device in a conventional printing device of this type is shown in FIGS. FIG. 15 shows a double tractor type paper loading device. This paper loading device performs printing on a hopper 102 on which the continuous papers 101 are placed in a stacked state, and the surface of the continuous papers 101 fed from the hopper 102. A printing unit including a print head 103 and a platen 104, and a stacker 105 for stacking the continuous papers 101 after printing are provided. The lower tractor 106 and the upper tractor 10 are provided before and after the printing section.
7 are provided, and a back tension roller 108 that applies a back tension to the continuous paper 101 fed to the printing unit is provided between the lower tractor 106 and the printing unit. In the paper loading device having such a configuration, the lower tractor 106 is provided with the feed hole at the leading end of the continuous paper 101.
Continuous paper 10 by hooking on the tractor pin of
After loading 1, the continuous paper 101 is conveyed in the direction of the arrow A by interlocking the lower tractor 106 and the upper tractor 107 after the loading, and the printed continuous paper 101 is sequentially folded and stacked on the stacker 105.

In the upper tractor type sheet loading device shown in FIG. 16 (a), the lower tractor 106 described above is used.
Instead of paper feed roller 1 that doubles as a back tension roller
09 are provided. Here, the paper feed roller 109 is
As shown in FIG. 16B, the motor 110 is driven via the belt 111, and when the paper is loaded, the motor 110 is normally rotated to rotate the paper feed roller 109 in the paper loading direction. Motor 1 for transportation
By stopping or reversing 10
Back tension is applied to. In this paper loading device, the continuous paper 101 is loaded from below the paper feed roller 109, and after loading, the continuous paper 10 is pulled by hooking the feed holes of the continuous paper 101 on the tractor pins of the upper tractor 107.
1 is conveyed in the direction of arrow A.

[0005]

However, in any of the above-mentioned conventional paper loading devices, the timing of feeding the continuous paper 101 and the rotational speed of the upper tractor 107 are not satisfied when loading the paper. When they are not synchronized, there is a problem in that the feed hole of the continuous paper 101 is not smoothly inserted into the tractor pin of the upper tractor 107, causing a so-called jam phenomenon and impairing print quality. Further, particularly in the case of a double tractor type paper loading device, the continuous paper 1 is attached to the tractor pin of the lower tractor 106 when the paper is loaded.
Since it is necessary to squat the work of fitting the 01 feed hole, there is a problem in that the operability is difficult.

The present invention has been made to solve the above problems, and can easily and surely load paper with a simple mechanism, thereby improving the printing quality. An object of the present invention is to provide an automatic loading device for continuous paper that can be used.

[0007]

In order to achieve the above-mentioned object, an automatic continuous paper loading device according to the present invention comprises, firstly,
As shown in the principle diagram of the invention of FIG. 1, continuous paper (1)
Tractor (2) that engages with the feed hole of the tractor to convey the continuous paper (1), and sends the continuous paper (1) toward the tractor (2) provided on the upstream side of the tractor (2). In a continuous paper automatic loading device including a paper feeding means (3), a continuous paper (1) fed by the paper feeding means (3) to a position immediately upstream of the tractor (2).
And a tractor control means (5) for receiving the output of the paper detection means (4) and driving the tractor (2). is there.

Secondly, the continuous paper automatic loading apparatus according to the present invention is, as shown in the principle diagram of FIG.
A first tractor (6) that engages with the feed hole of the continuous paper (1) and conveys the continuous paper (1), and this first tractor (6)
In a continuous paper automatic loading device provided with an upstream side of the second tractor (7) for feeding the continuous paper (1) toward the first tractor (6), the first tractor (6) is loaded during paper loading. ) Is higher than the rotation speed of the second tractor (7), the first tractor (6) and the second tractor (7) are driven in the forward rotation direction, and when the paper is retreated. The rotation speed of the first tractor (6) is lower than the rotation speed of the second tractor (7), and the first tractor (6) and the second tractor (7) are driven in the reverse direction. A tractor drive means (8) is provided.

Further, as shown in the principle diagram of the invention of FIG. 3, thirdly, the continuous paper automatic loading device according to the present invention engages with the feed hole of the continuous paper (1) to form the continuous paper. (1)
A first tractor (6) that conveys the continuous paper (1) and a second tractor (7) that is provided on the upstream side of the first tractor (6) and sends out the continuous paper (1) toward the first tractor (6). In the continuous paper automatic loading device provided, between the second tractor (7) and the printing section (9) provided on the downstream side of the second tractor (7), the printing section (9) is used for printing. A back tension is applied to the continuous paper (1), and a tension applying roller (10) is provided to release the back tension to the continuous paper (1) when the paper is loaded and the paper is retracted. is there.

[0010]

According to the automatic continuous paper loading apparatus having the first feature, when the continuous paper (1) is inserted into the paper feeding means (3), the continuous paper (1) is fed into the paper feeding means (3).
Is automatically drawn in and sent forward. The leading edge of the continuous paper (1) is the paper detecting means (4).
When it is detected by the tractor (2), the tractor (2) disposed immediately downstream of the paper detecting means (4) is driven by the detection signal, whereby the tractor pin of the tractor (2) is moved to the continuous paper (1). The continuous paper (1) is smoothly inserted into the feed hole of the paper and is conveyed by the tractor (2).

In the continuous paper automatic loading device having the first feature, as a preferred embodiment, the tractor in the retracted position when the leading edge of the continuous paper (1) is detected by the paper detection means (4). The tractor (2) can be driven at the same time that the (2) is rotated to the transport position. This ensures that the tractor pin is inserted into the feed hole of the continuous paper (1).

Further, a registration roller for aligning the leading end of the continuous paper (1) is provided between the tractor (2) and the paper detection means (4), and this registration roller is driven in conjunction with the tractor (2). By doing so, the leading edge of the continuous paper (1) can be aligned immediately before the tractor (2), and the tractor pin can be inserted into the feed hole of the continuous paper (1) more reliably.

Further, the paper feeding means (3) may be a pair of paper feeding rollers for nipping and feeding the continuous paper (1). In that case, set these paper feed rollers to continuous paper (1).
When the continuous paper (1) is set in the tractor (2) and then reversely driven to apply back tension to the continuous paper (1), the slack of the continuous paper (1) can be eliminated after the continuous paper (1) is set. it can. Further, when the paper feeding means (3) is a sprocket wheel which feeds the continuous paper (1) by engaging with the feed hole of the continuous paper (1), the skew of the paper can be prevented.

Further, on the upstream side of the paper feeding means (3), a pair of paper guides whose distances can be adjusted according to the paper size of the continuous paper (1) to be conveyed are provided, and the paper guides are moved. The pair of left and right tractors (2) can be adjusted to be spaced from each other by interlocking with, and by doing so, the paper guide can be set according to the paper size of the continuous paper (1). The interval between the tractors (2) can be set.

Next, according to the continuous paper automatic loading device having the second feature, the first tractor (6) and the second tractor (7) are driven in the forward direction at the time of loading the paper, and Since the rotation speed of the first tractor (6) is made higher than that of the second tractor (7), the tractor pin of the first tractor (6) can be smoothly inserted into the feed hole of the continuous paper (1). In addition, proper tension can be applied to the continuous paper (1) between the first tractor (6) and the second tractor (7) to eliminate the slack of the continuous paper (1).

In the continuous paper automatic loading device having the second feature, as one embodiment, the tractor drive means (8) is provided separately for the first tractor (6) and the second tractor (7). Two motors to be driven, and a sheet conveying section and a drive shaft provided on a driving shaft of the first tractor (6) when a pulling force of a predetermined amount or more acts on the sheet conveying section of the first tractor (6). A first torque limiter that causes a slip between the second tractor and the second tractor (7)
A second torque limiter that is provided on the drive shaft of the second tractor (7) and that causes a slip between the paper transport unit and the drive shaft when a tensile force greater than a predetermined value acts on the paper transport unit of the second tractor (7). Can be one.

As another embodiment, the tractor drive means (8) is replaced by the first tractor (6) and the second tractor (6).
One motor that drives the tractor (7) at the same time, and the drive force of the motor provided only on the drive shaft of the first tractor (6) and rotating the drive shaft in the paper loading direction. ) And a drive shaft of the second tractor (7) provided on the drive shaft of the second tractor (7) and a pulling force of a predetermined amount or more acts on the paper transport unit of the second tractor (7). And a torque limiter that causes a slip between the two.

In still another embodiment, the tractor drive means (8) drives a tractor of either the first tractor (6) or the second tractor (7), and a motor for driving the tractor. It may be provided with two sets of gear mechanisms that selectively reduce and accelerate the driving force to the other tractor of the first tractor (6) or the second tractor (7) and selectively transmit the driving force.

Further, according to the continuous paper automatic loading device having the third characteristic, at the time of printing by the printing unit (9),
Back tension is applied to the continuous paper (1) by the tension applying roller (10) provided between the second tractor (7) and the printing unit (9) to eliminate the slack of the continuous paper (1). When the paper is loaded and the paper is retracted, the application of the back tension to the continuous paper (1) is released and the tension applying roller (10) is prevented from acting as a load on the continuous paper (1).

In the continuous paper automatic loading device having the third feature, as one embodiment, the tension applying roller (10) is arranged opposite to the freely rotatable back tension roller and the back tension roller. And a pinch roller. When applying back tension to the continuous paper (1), the back tension roller and the pinch roller are moved to an operating position by the operation of a solenoid, and when applying back tension to the continuous paper (1). The back tension roller and the pinch roller can be moved to the retracted position by the operation of the solenoid.

As another embodiment, the tension applying roller (10) is a back tension roller that can be driven to rotate forward and backward and has an electromagnetic clutch built therein, and a pinch roller arranged to face the back tension roller. In addition, when the printing unit (9) performs printing, the electromagnetic clutch is disengaged so that back tension is applied to the continuous paper (1), while the electromagnetic clutch is used when the paper is loaded and the paper is retracted. It can be made to function as a carrying roller for carrying the continuous paper (1) by connecting the.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of an automatic continuous paper loading device according to the present invention will be described with reference to the drawings.

FIG. 4 shows the overall construction of the continuous paper automatic loading device according to the first embodiment. The automatic loading device of this embodiment includes a hopper 12 that is placed in a state where stacked continuous papers 11 are stacked, a print head 13a that prints on the surface of the continuous paper 11 that is fed from the hopper 12, and a platen 13b. The unit 13 and the stacker 14 for stacking the printed continuous papers 11 are provided. A pair of paper feed rollers 15 that sandwich and convey the continuous paper 11 are provided on the upstream side of the printing unit 13, and a paper guide 16 that guides the continuous paper 11 toward the paper feed rollers 15.
Is provided, and the continuous paper 11 is provided on the downstream side of the printing unit 13.
A tractor 17 having a large number of tractor pins 17a that engage with the sprocket holes of the tractor 17 is provided. Further, a photoelectric first sensor 18 and a second sensor 19 for detecting the presence / absence of the continuous paper 11 are provided at positions immediately before the paper feed roller 15 and the tractor 17, respectively. The paper feed roller 15 can be rotated forward and backward by using, for example, a double-rotation stepping motor. When the paper is loaded, the paper feed roller 15 is normally rotated (rotated in the paper transport direction), and when the paper is transported, it is reversely driven. Print part 1
It serves as a back tension roller that applies a back tension to the continuous paper 11 sent to the sheet 3.

In the thus configured automatic loading apparatus, the paper feed roller 15 and the tractor 17 are in a stopped state when the apparatus is stopped. At this time, the tractor pins 17a of the tractor 17 are formed on the sprocket of the tractor 17, for example. A predetermined stop position (home position) is maintained by detecting the position of the hole formed by a photoelectric sensor or by a mechanical stopper.

When the leading edge of the continuous paper 11 in the hopper 12 is grasped and the leading edge of the continuous paper 11 is inserted into the paper guide 16 in this stopped state, the leading edge of the continuous paper 11 is detected by the first sensor 18. As a result, the paper feed roller 15 starts to rotate in the normal direction, and the continuous paper 11 is fed forward by automatic paper feeding. Then, the continuous paper 11 is printed by the printing unit 13.
When the leading edge of the continuous paper 11 is detected by the second sensor 19, the tractor 17 starts to operate and the tractor pin 17a is inserted into the feed hole of the continuous paper 11, thus automatically loading the continuous paper 11 on the tractor 17. Will be done. After loading the continuous paper 11, the paper feed roller 15 is reversely driven to apply back tension to the continuous paper 11, and the printing unit 13 starts printing on the surface of the continuous paper 11. The printed continuous paper 11 is sequentially folded and stacked in the stacker 14.

In the present embodiment, the paper feed roller 15 may be composed of a sprocket wheel that engages with the feed hole of the continuous paper 11. If the paper feed roller 15 is composed of a sprocket wheel in this way, it becomes possible to prevent skew of the continuous paper 11 being conveyed.

FIG. 5 shows the overall construction of the continuous paper automatic loading device according to the second embodiment. In each of the following embodiments, the same or common parts as those in the first embodiment will be designated by the same reference numerals and their detailed description will be omitted.

In this embodiment, the tractor 17 of the first embodiment is constructed so as to be rotatable downward about a fulcrum shaft 20 provided on a sprocket on the downstream side. Then, as shown in FIG. 6, one end of a lever lever 21 is fixed to the fulcrum shaft 20, and the other end of the lever lever 21 is inserted into a sprocket on the upstream side of the tractor 17. It is engaged with the rod 22. Further, a tension coil spring 2 for urging the one end side downward from the one end side of the fulcrum shaft 20 fixing portion of the lever lever 21.
3 is locked, and the other end of the lever lever 21 is locked with a solenoid 24 which pulls down the other end of the lever lever 21 during excitation.

In the automatic loading apparatus constructed as described above, the lever lever 21 is moved to the position shown in FIG.
In the state where the tractor 17 is pulled down in the direction of arrow B in (a) and the tractor 17 is in the retracted position (the position indicated by the chain double-dashed line in FIG. 5, the position shown in FIG. 6A), the leading edge of the continuous paper 11 is detected by the second sensor 19. Is detected, the solenoid 24 is demagnetized, so that the lever lever 2 is biased by the tension coil spring 23.
1 is pulled in the direction of arrow C in FIG. 6B, the tractor 17 is moved to the transport position (the solid line position in FIG.
(Position (b)), the driving of the tractor 17 is started at the same time. With the tractor 17 having such a configuration, the tractor pin 17a can be more surely inserted into the feed hole of the continuous paper 11.

FIG. 7 shows the overall construction of an automatic continuous paper loading device according to the third embodiment. In this embodiment, a registration roller 25 is provided between the second sensor 19 and the tractor 17 for aligning the leading ends of the sheets. Here, the registration roller 25 is driven by a stepping motor 26 as shown in FIG. 8, and the tractor 17 is driven via a timing belt 27 in conjunction with the registration roller 25. .

Thus, the continuous paper 1 is fed by the second sensor 19.
When the front end of the continuous paper 11 is corrected by the registration roller 25, the registration roller 25
Conveys the continuous paper 11 in conjunction with the tractor 17. With this configuration, the leading ends of the continuous paper 11 are aligned by the registration rollers 25, so that the tractor pin 17a can be inserted into the feed hole of the continuous paper 11 more reliably.

In each of the above-described embodiments, the paper guide 16 disposed upstream of the paper feed roller 15 is, as shown in FIG. 9, a pair of left and right guides for guiding both side edges of the continuous paper 11 to be loaded. The guide members 28a and 28b are provided. Here, one (right side in the figure) guide member 28
A rack 29 is attached to b, and a pinion 30 that meshes with the rack 29 is provided on the main body side. Similarly, of the pair of left and right tractors 17, one tractor 17
A rack 31 is attached to the rack 31 and a pinion 32 that meshes with the rack 31 is also provided on the main body side. The two pinions 30 and 32 are interlocked with each other via a timing belt 33 to rotate.

With such a configuration, when the pinion 30 is rotated to adjust the left and right positions of the guide member 28b according to the size of the sheet, the left and right positions of the tractor 17 are automatically adjusted.

FIG. 10 is a block diagram of the essential parts of an automatic continuous paper loading device according to the fourth embodiment. This embodiment is applied to the double tractor system. In the automatic loading device of this embodiment, the lower tractor 3 is provided before and after the printing unit 13.
4 and an upper tractor 35 are provided respectively, and these tractors 34 and 35 are each driven by a separate motor. Further, the drive shafts 34a, 35a of the lower tractor 34 and the upper tractor 35 are respectively provided with torque limiters (not shown) that slip when a tension force of a predetermined amount or more acts on the continuous paper 11. However, the operating direction of the torque limiter on the drive shaft 34a is the arrow D'direction in the drawing, and the operating direction of the torque limiter on the drive shaft 35a is the arrow E direction in the drawing.

In such a structure, the rotational speed V _D of the drive shaft 35a is set to the drive shaft 3 when the paper is loaded and conveyed.
4a, the drive shaft of the lower tractor 34 and the drive shaft of the upper tractor 35 are driven by driving the respective motors in a state of being set to be higher than the rotation speed V _D'of V4a, that is, V _D > V _{D '.} 35a is the direction of normal rotation (arrow D,
It is driven to rotate in the D'direction). By doing so, even if the pitches of the tractor pins of the lower tractor 34 and the upper tractor 35 are deviated, the tractor pins of the upper tractor 35 can be smoothly inserted into the feed holes of the continuous paper 11. Further, when the continuous paper 11 is conveyed, the lower tractor 3
Since the torque limiter of No. 4 causes slip due to the difference of V _D -V _{D '} , proper tension is applied to the continuous paper 11 between the lower tractor 34 and the upper tractor 35, and slack does not occur in the continuous paper 11. . The transport speed of the continuous paper 11 at this time depends on the speed V _D of the upper tractor 35.

Further, when the sheet is retracted, the rotational speed V _{E '} of the drive shaft 34a is set to be higher than the rotational speed V _E of the drive shaft 35a, that is, V _E' > V _E. The drive shafts 34a and 35a are rotationally driven in the reverse rotation directions (arrows E and E'directions), respectively. This allows
Contrary to the above-described paper conveyance, the torque limiter of the upper tractor 35 slips and the retreat speed depends on the speed V _{E ′} of the lower tractor 34. As with the paper conveyance, the slack of the continuous paper 11 is reduced. It can be transported without occurring.

FIG. 11 is a block diagram showing the essential parts of an automatic continuous paper loading device according to the fifth embodiment. In this embodiment, each tractor 34, 35 is driven by one motor 36, a drive shaft 34a of the lower tractor 34 is provided with a torque limiter (operating direction is F'direction), and a drive shaft 35a of the upper tractor 35 is provided. A one-way clutch (not shown) that transmits the drive only when the drive shaft 35a rotates in the forward direction (arrow F direction) is provided.

With this structure, the rotational speed V _F of the drive shaft 35a is higher than the rotational speed V _{F ′} of the drive shaft 34a when the paper is loaded and conveyed (V _{F ').
F} > VF _' ) In the set state, each drive shaft 34a, 35a
Are respectively driven to rotate in the normal direction (arrows F and F'directions), and the continuous paper 11 is conveyed without causing slack due to slippage in the torque limiter of the lower tractor 34. 34 is rotated in the direction of arrow G'at the speed V _{G '} , and the upper tractor 35 is freely rotated in the direction of arrow G by the one-way clutch to be rotated following the speed of the lower tractor 34.

FIG. 12 is a block diagram showing the essential parts of an automatic continuous paper loading device according to the sixth embodiment. In this embodiment, the drive shaft 35a of the upper tractor 35 is driven by the motor 36, and the rotation of the drive shaft 35a is transmitted to the driving gear 38 via the timing belt 37. The driving gear 38 has a one-way clutch-equipped two-speed gear 39 for receiving drive transmission in a locked state only when the driving gear 38 rotates in the direction of arrow H in FIG. 38 is shown in FIG.
A one-way clutch-equipped transmission gear 4 that is in a locked state and receives drive transmission only when rotating in the direction of arrow I in (b).
0 are meshed with each other, and these transmission gears 39, 40
Are engaged with the driven gear 45 via the intermediate gears 41, 42; 43, 44, respectively, and the rotation of the driven gear 45 is transmitted to the drive shaft 34a of the lower tractor 34 via the timing belt 46. Has become. A torque limiter is provided on each of the drive shafts 34a and 35a, as in the fourth embodiment shown in FIG.

By being configured in this way,
As shown in FIG. 12A, when the paper is loaded and conveyed, the motor 36 is rotated in the normal rotation direction (arrow J direction) so that the drive shaft 35a is rotated in the normal rotation direction (arrow K).
Direction), the driving gear 38 is rotated in the direction of arrow H, and the rotation of the driving gear 38 is decelerated via the gear train (gears 39, 41, 42) indicated by the arrow L to drive the driven gear 46. Is transmitted to the drive shaft 35a, and the drive shaft 34a is rotated in the forward direction (arrow K'direction) at a speed lower than that of the drive shaft 35a. At this time, the lower tractor 34 slips due to the torque limiter provided on the drive shaft 34a of the lower tractor 34. On the other hand, when the paper moves backward,
As shown in (b), the motor 36 is rotated in the reverse rotation direction (direction of arrow M), so that the drive shaft 35a is rotated.
Is rotated in the reverse rotation direction (direction of arrow N), and the driving gear 38 is rotated in the direction of arrow I. The rotation of the driving gear 38 is indicated by arrow O (gear trains 40, 43, 4).
4) and is transmitted to the driven gear 45, and the drive shaft 34a is rotated in the reverse direction (arrow N'direction) at a speed higher than that of the drive shaft 35a. At this time, the upper tractor 35 slips by the torque limiter provided on the drive shaft 35a of the upper tractor 35.

In the case of this embodiment, since the rotation speed and the rotation direction of each tractor 34, 35 can be changed by one motor, an extra motor and a driver circuit etc. are unnecessary, which is advantageous in terms of cost. .

FIG. 13 shows an operation explanatory diagram of the back tension roller in the seventh embodiment. In this embodiment, in the double tractor type automatic loading device, in order to apply an appropriate tension to the continuous paper 11 supplied to the printing section, the back tension roller 48 and the back tension roller 48 are provided immediately upstream of the printing section. A tensioning roller composed of a pinch roller 49 arranged opposite to the coil 48 is arranged. As shown, these back tension roller 48 and pinch roller 49
Are attached to the tip ends of L-shaped levers 50 and 51, respectively, and these levers 50 and 51 are fulcrums 52 and 53 provided at positions sandwiching the transport surface of the continuous paper 11, respectively.
It is rotatably supported around. A tension coil spring 54 is stretched between the tip ends of the levers 50 and 51, and the levers 50 and 51 are operatively connected to each other by a long hole 55 and a pin 56 that engages with the long hole 55. Further, the lever 50 is rotated by the operation of the solenoid 57 locked to the rear end of the lever 50.

With such a structure, when the continuous paper 11 is printed and conveyed, the solenoid 57 is actuated in the direction of arrow P as shown in FIG. The continuous paper 11 is sandwiched between the tension roller 48 and the pinch roller 49, and thereby back tension is applied to the continuous paper 11. On the other hand, when the paper is loaded (conveyed) and the paper is retracted, as shown in FIG. Solenoid 5 as shown
By operating 7 in the direction of arrow Q, the back tension roller 4 is resisted against the tensile force of the tension coil spring 54.
8 and the pinch roller 49 are retracted from the continuous paper 11.

According to this embodiment, a motor or the like is not required when applying back tension to the continuous paper, so that the structure can be simplified. In FIG.
The principal part block diagram of the continuous paper automatic loading apparatus which concerns on 8th Example is shown.

In this embodiment, the back tension roller 58 is disposed between the lower tractor 34 and the printing portion 13 and the pinch roller 5 arranged to face the back tension roller 58.
9 is provided, and the back tension roller 58 is drivingly connected to the drive shaft 35a of the upper tractor 35 driven by the motor 36. Also, the back tension roller 5
8 is provided with an electromagnetic clutch, which is connected when the paper is loaded and when the paper is retracted, and is disconnected when the print is conveyed.

With this construction, when the paper is loaded and the paper is retracted, the electromagnetic clutch is connected so that the continuous paper 11 is nipped and conveyed between the back tension roller 58 and the pinch roller 59. ,on the other hand,
At the time of print conveyance, the electromagnetic clutch is disengaged and the back tension roller 58 is slipped, thereby preventing the slack of the continuous paper 11 between the lower tractor 34 and the upper tractor 35.

The continuous paper 11 in this embodiment is the continuous paper (1) in the present invention, the tractor 17 and the upper tractor 35 are the tractors (2), the paper feed roller 15, the lower tractor 34 and the back tension roller 58. The pinch roller 59 is attached to the paper feeding means (3) and is connected to the second sensor 19
Is the paper detecting means (4), the lever lever 21, the tension coil spring 23, the solenoid 24, etc. are the tractor control means (5), the upper tractor 35 is the first tractor (6), and the lower tractor 34 is the second tractor ( 7), the motor 36, the timing belts 37 and 47, the gears 38 to 46, the torque limiter, the one-way clutch, etc. are used as the tractor drive means (8), the printing unit 13 is used as the printing unit (9), the back tension roller 48, and the pinch. The roller 49, the back tension roller 58, and the pinch roller 59 are tension applying rollers (1
0) respectively.

[0048]

As described above, according to the first invention of the present application, the tractor (2) is driven when the leading edge of the continuous paper (1) is detected. The tractor pin of the tractor (2) with a continuous mechanism (1)
Can be smoothly inserted into the sprocket hole.

According to the second aspect of the invention, in the double tractor type apparatus, the rotational speed of the tractor on the downstream side in the transport direction of the continuous paper (1) is made higher than the rotational speed of the tractor on the upstream side. Therefore, the tractor pin of the first tractor (6) on the downstream side can be smoothly inserted into the feed hole of the continuous paper (1) when the paper is loaded, and the first tractor (6) can be smoothly inserted when the paper is loaded and the paper is retracted. Continuous paper (1) between the tractor (6) and the second tractor (7)
It is possible to eliminate slack and improve printing quality.

Further, according to the third aspect of the invention, the back tension is applied to the continuous paper (1) at the time of print conveyance, and the back tension is released at the time of loading the paper and retreating the paper. Sometimes continuous paper (1)
It is possible to improve the printing quality by applying an appropriate back tension to the sheet, and it is possible to smoothly convey the sheet when the sheet is loaded.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of an automatic continuous paper loading device according to the first invention.

FIG. 2 is an explanatory view of the principle of an automatic continuous paper loading device according to the second invention.

FIG. 3 is an explanatory view of the principle of an automatic continuous paper loading device according to a third invention.

FIG. 4 is an overall configuration diagram of an automatic continuous paper loading device according to a first embodiment.

FIG. 5 is an overall configuration diagram of an automatic continuous paper loading device according to a second embodiment.

FIG. 6 is an operation explanatory view of a tractor drive unit in the second embodiment.

FIG. 7 is an overall configuration diagram of an automatic continuous paper loading device according to a third embodiment.

FIG. 8 is a diagram showing a driving unit of a registration roller and a tractor in a third embodiment.

FIG. 9 is a perspective view showing a configuration of a paper guide in the first to third embodiments.

FIG. 10 is a configuration diagram of essential parts of an automatic continuous paper loading device according to a fourth embodiment.

FIG. 11 is a configuration diagram of essential parts of an automatic continuous paper loading device according to a fifth embodiment.

FIG. 12 is a configuration diagram of essential parts of a continuous paper automatic loading device according to a sixth embodiment.

FIG. 13 is an operation explanatory view of a back tension roller in the seventh embodiment.

FIG. 14 is a configuration diagram of essential parts of an automatic continuous paper loading device according to an eighth embodiment.

FIG. 15 is a view showing a conventional double tractor type sheet loading device.

FIG. 16 is a view showing a conventional upper tractor type sheet loading device.

[Explanation of symbols]

 1, 11 continuous paper 2, 17 tractor 3 paper feeding means 4 paper detecting means 5 tractor control means 6 first tractor 7 second tractor 8 tractor driving means 9, 13 printing unit 10 tension applying roller 15 paper feeding roller 16 paper guide 17a Tractor pin 19 Second sensor 21 Lever lever 23 Extension coil spring 24 Solenoid 25 Registration roller 26 Stepping motor 27, 33, 37, 46 Timing belt 28a, 28b Guide member 29, 31 Rack 30, 32 Pinion 34 Lower tractor 35 Upper tractor 36 Motor 38 Drive gear 39 Speed change two-step gear with one-way clutch 40 Speed change gear with one-way clutch 41, 42, 43, 44 Intermediate gear 45 Driven gear 48, 58 Back tension roller 49, 59 Pinch roller 54 Extension coil spring 57 Solenoid

Claims (3)

[Claims] 1. A tractor (2) which engages with a feed hole of a continuous paper (1) and conveys the continuous paper (1), and a tractor (2) provided upstream of the tractor (2). In a continuous paper automatic loading device provided with a paper feeding means (3) for feeding the continuous paper (1) toward the continuous sheet, the continuous paper is fed by the paper feeding means (3) to a position immediately upstream of the tractor (2). A paper detecting means (4) for detecting the front end of the paper (1) is provided, and the paper detecting means (4) is also provided.
An automatic continuous paper loading device, characterized in that it is provided with a tractor control means (5) for driving the tractor (2) in response to the output of the tractor. 2. A first tractor (6) which engages with a feed hole of a continuous paper (1) and conveys the continuous paper (1), and the first tractor (6).
An automatic continuous paper loading device comprising a second tractor (7) provided on the upstream side of a tractor (6) and feeding the continuous paper (1) toward the first tractor (6). The rotation speed of the first tractor (6) is higher than the rotation speed of the second tractor (7), and the first tractor (6) and the second tractor (7) are driven in the normal rotation direction. , So that the rotational speed of the first tractor (6) is lower than the rotational speed of the second tractor (7) when the paper is retracted, and the first tractor (6) and the second tractor (7) are reversed. 1. An automatic continuous paper loading device, characterized in that it is provided with a tractor driving means (8) for driving in the direction. 3. A first tractor (6) which engages a feed hole of a continuous paper (1) and conveys the continuous paper (1);
An automatic continuous paper loading device comprising a second tractor (7) which is provided on the upstream side of a tractor (6) and sends out the continuous paper (1) toward the first tractor (6). 7) and a printing unit (9) provided on the downstream side of the second tractor (7), a back tension is applied to the continuous paper (1) during printing by the printing unit (9), An automatic continuous paper loading device comprising a tension applying roller (10) for releasing the application of back tension to the continuous paper (1) at the time of loading and retreating the paper.