JP2008007301A - Tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the state of conveyance of tractor paper by a tractor having a guide surface curved in a recessed arc shape. <P>SOLUTION: The tractor 301 comprises a pair of tractor bodies 401 having a base body 411 on which the guide surface 415 having an arc curved portion and supporting the tractor paper is formed, a pin belt 413 stretched between drive wheels installed at both ends of the base body 411, and paper retaining plates 416, 417 in which a pin 412 is inserted in a feed hole, and for retaining the tractor paper. The tractor further comprises a paper retaining part 601 for retaining the tractor paper between the pair of tractor bodies 401 on the paper retaining plate 417 side of the curved portion of the guide surface 415. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tractor.

  2. Description of the Related Art Conventionally, there is a tractor that is arranged on the upstream side or the downstream side of a printing unit with a printer or the like and transports tractor paper (for example, see Patent Document 1). The tractor includes a pair of tractor bodies provided with pin belts. And a tractor paper is conveyed by inserting a pin in the feed hole formed in the both sides of the tractor paper, and rotating a pin belt.

  By the way, there is an office machine that includes a display unit and an input unit on the front surface of a housing, and prints input information on a tractor sheet by a printing unit inside the housing and discharges it from the upper surface of the housing. In such an office machine, the tractor is disposed at a rear position of the housing without the display unit and the input unit, and conveys the tractor paper toward the printing unit.

Japanese Utility Model Publication No. 6-042187

  In the tractor, the pins and the paper pressing plate restrict the movement of the tractor paper, and the forced conveyance is performed. On the paper path in the middle from the tractor to the printing unit, the friction conveyance by the conveyance roller is performed. The frictional conveyance is more likely to cause paper misalignment during conveyance.

  Accordingly, the further the distance between the tractor and the printing unit is, the more the conveyance error occurs and the printing deviation also occurs. That is, it is desirable that the tractor and the printing unit are disposed at positions closer to each other.

  Therefore, it is conceivable to extend the length of the tractor body and curve it so that the guide surface that supports the tractor paper is curved in a concave arc shape. With such a tractor, the workability of the tractor paper set at the rear of the housing is ensured, while the distance between the tractor and the printing unit is shortened, and printing misalignment and the like can be suppressed.

  However, new problems also arise. Here, FIG. 9 is a perspective view showing a tractor sheet conveyed by a tractor whose guide surface is curved in a concave arc shape. Note that the tractor is omitted. The tractor paper is curved and conveyed along the guide surface because both sides of the tractor paper are pressed by the paper presser plate, whereas the central part is not restricted like the paper presser plate. Instead of trying to curve along the guide surface, as shown in FIG. 9, it rises like a mountain. If the tractor paper in such a state is further conveyed, a jam or the like is caused.

  An object of the present invention is to improve the conveyance state of a tractor sheet by a tractor having a guide surface curved in a concave arc shape.

  The tractor according to the present invention includes a base having an arc-shaped curved portion and a guide surface that supports one surface of the tractor paper, a rotating body provided at both end portions of the base, and the rotating body. A pin belt in which pins that can be inserted into and removed from the feed holes formed on both sides of the tractor paper are formed on the outer peripheral surface, a paper presser plate that presses the other surface of the tractor paper in which the pins are inserted into the feed holes, A pair of tractor main bodies, a drive unit that rotationally drives at least one of the rotating bodies, and a tractor provided between the pair of tractor main bodies and on the paper pressing plate side of the curved portion of the guide surface. A paper presser that holds the other side of the paper.

  According to the present invention, since the paper pressing unit presses the tractor paper that is going to rise without being curved, the conveyance state when the tractor paper is conveyed by the tractor having the guide surface curved in the concave arc shape can be improved. .

  An embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing the office machine 101. The office machine 101 includes a housing 201 that accommodates each part. In FIG. 1, a part of the housing 201 is cut away.

  A display unit 205 for displaying information is provided on the front side of the housing 201. A keyboard 206 is provided below the display unit 205 as an input unit for inputting information.

  A manual feed slot 207 for inserting a sheet is formed on the front surface of the housing 201 between the display unit 205 and the keyboard 206. A discharge port 210 is formed on the upper surface portion of the housing 201. A paper path 208 from the manual feed port 207 to the paper discharge port 210 is formed inside the housing 201. A plurality of paired transport rollers 209 are arranged in the paper path 208, and the paper (for example, cut sheet paper) inserted from the manual feed port 207 is transported by the rotation of the transport roller 209 and discharged from the paper discharge port 210. Guided towards The transport roller 209 is driven to rotate by a motor (not shown).

  Further, inside the housing 201, a printing unit 202 is provided at a terminal portion of the paper path 208 at a position below the paper discharge outlet 210. The printing unit 202 includes a print head 203 and a flat platen 204 that are disposed to face each other via a paper path 208. The platen 204 may be a platen roller or the like. The print head 203 is movably supported by a carrier shaft (not shown) arranged along the longitudinal direction of the platen 204, and is driven to reciprocate by a drive unit (not shown). A paper discharge roller 211 is provided in a paper path 208 between the printing unit 202 and the paper discharge outlet 210. The paper that has been printed by the printing unit 202 is conveyed toward the paper discharge port 210 by the paper discharge roller 211 and is discharged from the paper discharge port 210.

  A frame 221 is provided behind the housing 201. The tractor 301 is supported by the frame 221. The tractor 301 is a position where a part of the tractor 301 protrudes rearward of the housing 201, and is disposed at a position where the tractor 301 is connected to the paper path 208 on the upstream side of the printing unit 202.

  The tractor 301 includes a pair of tractor bodies 401 that rotatably support the pin belt 413 (see FIG. 4) and that have a guide surface 415 having a concave arcuate curved portion. The guide surface 415 supports one surface (lower surface) of the tractor paper 501. The tractor main body 401 includes paper pressing plates 416 and 417 for pressing the other surface (upper surface) of the tractor paper 501. The tractor 301 conveys the tractor paper 501 supported by the guide surface 415 and pressed by the paper pressing plates 416 and 417 toward the printing unit 202 by the rotation of the pin belt 413 and sends it to the paper path 208.

  Further, in the present embodiment, a paper presser 601 (to be described later) that holds the tractor paper 501 between the pair of tractor bodies 401 and on the fixed paper presser plate 417 (see FIG. 3) side of the curved portion of the guide surface 415 is provided. I have.

  FIG. 2 is a perspective view showing the tractor paper 501. Feed holes 502 are formed at regular intervals on both sides of the tractor paper 501. Further, the tractor paper 501 is formed with perforations 503 so as to be separable at regular intervals. Then, the tractor sheet 501 is placed at a position behind the office machine 101, and is drawn out by the conveyance of the tractor 301 from a state where the tractor sheet 501 is folded in a zigzag manner at the perforation 503. As an example, the tractor sheet 501 is a slip sheet formed by overlapping a plurality of sheets.

  FIG. 3 is a perspective view showing the tractor 301 according to the first embodiment.

  A pair of tractor main bodies 401 provided in the tractor 301 includes a base body 411 on which a guide surface 415 that supports the lower surface of the tractor paper 501 is formed. The base 411 has an arcuate curved portion. That is, the base body 411 has a shape curved in an arc shape, and the guide surface 415 is formed inside the arc formed by the base body 411. Therefore, the guide surface 415 has a concave arc-shaped curved portion.

  The tractor body 401 is provided with an opening / closing paper pressing plate 416 and a fixed paper pressing plate 417 spaced from the guiding surface 415 along the locus of the guiding surface 415 (see FIG. 4).

  In the opening / closing paper pressing plate 416 and the fixed paper pressing plate 417, long holes 418 and long holes 419 that are long in the paper transport direction are formed at positions that avoid contact with the pins 412 of the pin belt 413. A long hole cover 418a and a long hole cover 419a are provided at positions covering the long hole 418 and the long hole 419, respectively.

  The opening / closing paper pressing plate 416 can be opened and closed. That is, the hinge piece 420 is provided on the side portion of the base body 411. The opening / closing paper pressing plate 416 is rotatably attached to the hinge piece 420 by a hinge pin (not shown). Therefore, the opening / closing paper pressing plate 416 can be opened and closed, and the pin belt 413 can be exposed by opening the opening / closing paper pressing plate 416.

  The fixed paper pressing plate 417 is fixed to the base body 411 by a fastening member or the like. Further, a pair of left and right plate-like roller holding members 436 are further provided on the fixed paper presser plate 417, and are provided at two positions in the front and rear direction in the paper transport direction and are in contact with the outer peripheral surface of the pin belt 413. 432 is supported by a roller holding member 436. Since the roller 432 is in contact with the outer peripheral surface of the pin belt 413, a part of the fixed paper pressing plate 417 is notched (not shown).

  Incidentally, a drive shaft 351, a fixed shaft 361, and a support shaft 602 as a drive unit are supported in parallel with each other by a frame 221 (see FIG. 1). The drive shaft 351 and the fixed shaft 361 pass through the base 411 of the tractor body 401, and the support shaft 602 passes through the roller holding member 436.

  A drive gear 371 is fixed to one end of the drive shaft 351. In addition, a motor 372 having a motor gear 373 fixed to the rotation shaft is provided inside the housing 201. The drive gear 371 and the motor gear 373 are provided at positions where the teeth mesh with each other. Therefore, when the motor 372 is driven, the driving force is transmitted to the drive shaft 351 via the motor gear 373 and the drive gear 371, and the drive shaft 351 rotates.

  FIG. 4 is a side view schematically showing the tractor body 401.

  A rotating body 421 is rotatably provided at both end portions inside the base body 411. The drive shaft 351 passes through the one rotating body 421. Therefore, the rotator 421 can receive the rotational force of the drive shaft 351.

  An endless pin belt 413 is wound around the rotating body 421. The pin belt 413 rotates integrally with the rotation of the rotator 421 that is stretched. That is, the rotating body 421 is rotationally driven by the rotation of the drive shaft 351, and the pin belt 413 is also rotated integrally with the rotational driving of the rotating body 421.

  On the outer peripheral surface of the pin belt 413, pins 412 are formed so as to project at equal intervals from the feed hole 502 (see FIG. 2) of the tractor paper 501 (see FIG. 2). Note that the diameter of the pin 412 is smaller than the diameter of the feed hole 502 of the tractor paper 501. Therefore, the pin 412 can be inserted into and removed from the feed hole 502 of the tractor paper 501.

  The opening / closing paper pressing plate 416 and the fixed paper pressing plate 417 press the upper surface of the tractor paper 501 in which the pins 412 are inserted into the feed holes 502. As a result, the tractor paper 501 is prevented from falling off due to the pin 412 coming off from the feed hole 502 during the conveyance.

  The tractor body 401 is slidable in the axial direction of the fixed shaft 361. Therefore, by moving one tractor body 401 in the axial direction of the fixed shaft 361, it is possible to use tractor paper 501 having an arbitrary paper width.

  By the way, the curved portion of the guide surface 415 is not an accurate arc shape, but the guide surface 415 is formed in an arc shape by the planar guide surface 415 continuing with an angle.

  Note that the guide surface 415 gradually increases in height at the end of the guide surface 415 as it proceeds in the paper transport direction. As a result, the tractor paper 501 to be conveyed is separated from the pin belt 413 as the end portion is approached, and the pin 412 is easily detached from the feed hole 502.

  Here, the roller 432 will be described with reference to FIG. The roller holding member 436 provided integrally with the fixed paper presser plate 417 has U-shaped grooves 437 formed at the same position on the left and right sides in the front and rear directions in the paper transport direction.

  The rollers 432 constitute a pair of left and right rollers 432 (see FIG. 3), and a roller shaft 433 is fixed through the center of the pair of rollers 432. At this time, the pair of rollers 432 are fixed to the roller shaft 433 at positions separated from each other. This position is a position that avoids interference with the pin 412 of the pin belt 413 and is a position that falls within the width of the pin belt 413.

  The roller shaft 433 is fitted in the U-shaped groove 437. The diameter of the roller shaft 433 is smaller than the width of the U-shaped groove 437. Therefore, the roller shaft 433 fitted in the U-shaped groove 437 is rotatable and can be displaced along the longitudinal direction of the U-shaped groove 437. It has become.

  A support shaft 602 passes through the roller holding member 436 at a position above the roller 432. A torsion spring 434 is wound around the support shaft 602. Then, both end portions of the torsion spring 434 wound around the support shaft 602 urge the roller shaft 433 of the roller 432 provided in the front and rear in the paper transport direction.

  The roller 432 is in a state in which the roller shaft 433 is urged to elastically press the outer peripheral surface of the pin belt 413 that contacts the roller 432. Thereby, the pin belt 413 is curved and rotated along the shape of the guide surface 415 without being lifted by the curved portion of the guide surface 415.

  Further, since the roller shaft 433 is biased so as to be displaceable along the U-shaped groove 437, the tractor paper 501 is conveyed between the pin belt 413 and the roller 432 regardless of the thickness of the tractor paper 501. Can do.

  Returning to FIG. The tractor 301 includes three sheet guides 701 between a pair of tractor main bodies 401. The paper guide 701 has a curved shape along the locus of the guide surface 415. The paper guide 701 supports the lower surface of the conveyed tractor paper 501.

  On the surface of the paper guide 701 that supports the tractor paper 501, a plurality of grooves are formed along the paper path direction. By providing such a groove, the contact area between the paper guide 701 and the tractor paper 501 is reduced, and the frictional resistance during conveyance is reduced.

  The paper guide 701 is attached to the drive shaft 351 and the fixed shaft 361 so as to be slidable. Accordingly, it is possible to cope with the conveyance of the tractor paper 501 having an arbitrary paper width. Needless to say, the number of sheet guides 701 is not limited to three.

  Next, the paper holding unit 601 provided in the form of the tractor 301 of the present embodiment will be described. In the present embodiment, as shown in FIG. 3, a fixed paper presser plate 417 in a curved portion of the guide surface 415 between the pair of tractor bodies 401 is supported by a support shaft 602 that penetrates the roller holding member 436. A paper presser 601 is provided at the side position.

  FIG. 5 is a side view showing the paper pressing unit 601 according to the first embodiment. FIG. 5 also shows the paper guide 701 and the guide surface 415 of the tractor body 401.

  A plurality of convex portions 611 extending in the paper transport direction are formed on the outer peripheral portion on the lower surface side (paper guide 701 side) of the paper pressing portion 601. The height of the portion of the paper pressing portion 601 including the convex portion 611 closest to the paper guide 701 is substantially the same as the height of the fixed paper pressing plate 417 in the position parallel to the axial direction of the support shaft 602.

  Such a paper presser 601 presses the tractor paper 501 (see FIG. 2) that is conveyed with the pins 412 (see FIG. 4) inserted into the feed holes 502 (see FIG. 2).

  When viewed from the side, as shown in FIG. 5, the shape of the paper pressing portion 601 gradually approaches the paper guide 701 from a position away from the paper guide 701 as the paper proceeds in the paper conveyance direction. After reaching a predetermined point of the curved portion of the guide 701, the guide 701 is curved in an arc shape so that the distance from the paper guide 701 increases. By adopting such a shape, the leading end of the tractor paper 501 can easily enter between the paper guide 701 and the paper presser 601 and is prevented from getting on the paper presser 601.

  By providing the convex portion 611 in the paper holding portion 601, the contact area between the paper guide 701 and the tractor paper 501 conveyed between the paper holding portion 601 is reduced, and the frictional resistance is reduced. Further, since the paper holding portion 601 has the shape described above, the paper holding portion 601 and the tractor paper 501 are in contact with each other by “lines”. Therefore, frictional resistance due to contact can be further suppressed.

  A shaft hole 605 penetrating both side surfaces is formed in the paper pressing portion 601. The inner diameter of the shaft hole 605 is larger than the outer diameter of the support shaft 602. Then, the support shaft 602 is inserted into the shaft hole 605, and the paper pressing portion 601 is supported by the support shaft 602. The paper pressing portion 601 and the support shaft 602 are not fixed to each other by other fixing means such as an adhesive. Therefore, the paper pressing portion 601 can be slid in the axial direction of the support shaft 602. Here, a support mechanism for supporting the paper pressing portion 601 between the pair of tractor main bodies 401 so as to be movable in a direction parallel to the drive shaft 351 which is the central axis of the rotating body 421 is realized.

  The support shaft 602 has a long convex portion along the axial direction, and the shaft hole 605 has a concave portion corresponding to the convex portion. The convex portion of the support shaft 602 is fitted into the concave portion of the shaft hole 605 and the paper pressing portion 601 is supported by the support shaft 602, so that the paper pressing portion 601 is restricted from rotating around the support shaft 602. .

  Returning to FIG. As shown in FIG. 3, two compression springs 603 are supported by the support shaft 602 with a support shaft 602 passing through the inner diameter portion thereof. The two compression springs 603 are arranged at a position sandwiching the paper pressing portion 601. At this time, the two compression springs 603 have the same length and the same mechanical behavior (elasticity and the like). The compression spring 603 elastically presses the side surface of the paper pressing portion 601 and the roller holding member 436. The paper pressing portion 601 is positioned at an intermediate position between the pair of tractor main bodies 401 by a compression spring 603.

  Here, when one tractor body 401 is slid in the axial direction of the fixed shaft 361 and the distance between the tractor bodies 401 is narrowed, the two compression springs 603 are similarly compressed, and the paper presser portion 601 is paired. The tractor body 401 is positioned at an intermediate position. Then, when the position of the tractor body 401 is returned to the original position, the two compression springs 603 are similarly relaxed, and the paper presser 601 is positioned at an intermediate position between the pair of tractor bodies 401.

  That is, when the tractor body 401 is moved in the axial direction of the drive shaft 351, the paper presser 601 is disposed at an intermediate position between the pair of tractor bodies 401 regardless of the position of the tractor body 401. Here, the first positioning mechanism is realized. By providing such a first positioning mechanism, it is not necessary to appropriately move the paper pressing portion 601 and workability is improved.

  At least one paper holding portion 601 is provided at an intermediate position between the pair of tractor main bodies 401. Thereby, the rising of the tractor paper 501 in which the central portion is raised can be suppressed. Note that, as will be described later, the paper pressing portion 601 is not limited to one. Furthermore, two intermediate positions may be provided at a position equidistant from the intermediate position.

  Further, the paper pressing unit 601 may not be positioned on the paper guide 701 and may be positioned between the two paper guides 701.

  Further, by supporting the paper pressing portion 601 on the support shaft 602, it is easy to arrange the paper pressing portion 601 at a position close to the tractor paper 501.

  A case where information is printed by conveying the tractor paper 501 in such a configuration will be described.

  First, the open / close paper pressing plate 416 is opened to expose the pin belt 413. Then, after the pin 412 is inserted into the feed hole 502 of the tractor paper 501, the opening / closing paper pressing plate 416 is closed. As a result, the tractor paper 501 is set on the tractor 301.

  As shown in FIG. 1, the tractor 301 is disposed at a position where a portion of the tractor main body 401 provided with the opening / closing paper pressing plate 416 protrudes rearward of the housing 201. Therefore, when the tractor paper 501 is set from the front side of the office machine 101 through the housing 201, the workability is good.

  In the office machine 101, an operator operates the keyboard 206 while looking at the display unit 205 to input various data. When the data input is completed and a predetermined printing operation is performed, the drive shaft 351 is driven, the pin belt 413 is rotated, and conveyance of the set tractor paper 501 is started. The tractor sheet 501 is conveyed by the tractor 301 and sent to the sheet path 208.

  While the tractor paper 501 is being transported, the central portion of the tractor paper 501 tends to rise without being along the curved paper guide 701. As a result, the tractor paper 501 is conveyed well.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  FIG. 6 is a perspective view showing a tractor 301 according to the second embodiment. Parts having the same functions as those shown in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof will be omitted (hereinafter the same). The difference between the tractor 301 of the present embodiment and the tractor 301 of the first embodiment is the quantity of the paper pressing portions 601. That is, the tractor 301 according to the present embodiment includes three paper pressing portions 601. Therefore, according to the present embodiment, it is possible to more reliably suppress the swell of the tractor paper 501 that swells widely in the paper width direction.

  Further, the paper pressing unit 601 of the present embodiment is different from the paper pressing unit 601 of the first embodiment in the shape when viewed from the side. That is, the paper pressing portion 601 of the present embodiment has a shape along the locus of the curved paper guide 701. By adopting such a shape, the contact area with the tractor paper 501 is larger than that of the paper pressing unit 601 of the first embodiment, but the contact time with the tractor paper 501 becomes longer, so You can suppress the excitement.

  Note that three paper pressing units 601 according to the first embodiment may be provided, and the number of the paper pressing units 601 is not limited to three.

  Further, as shown in FIG. 6, a compression spring 603 is supported by a support shaft 602 between the tractor body 401 and the paper pressing portion 601 or between adjacent paper pressing portions 601. At this time, the plurality of paper pressing portions 601 are arranged symmetrically with respect to a line passing through an intermediate position between the pair of tractor main bodies 401. When one of the tractor bodies 401 is slid and the distance between the tractor bodies 401 is reduced, the plurality of compression springs 603 are compressed in the same manner, and the plurality of paper holding portions 601 are again connected to the pair of tractor bodies. The lines are symmetrical with respect to a line passing through an intermediate position 401. Of course, the same applies when the position of the tractor body 401 is returned to the original position. Here, the second positioning mechanism is realized. By providing such a second positioning mechanism, it is not necessary to appropriately move the paper pressing portion 601 and workability is improved.

  Next, a third embodiment of the present invention will be described with reference to FIGS.

  FIG. 7 is a perspective view showing a tractor 301 according to the third embodiment. FIG. 8 is a side view showing a paper presser 601 according to the third embodiment. The paper pressing unit 601 of this embodiment includes a rotation roller 631 that is supported in parallel with the support shaft 602 and presses the upper surface of the tractor paper 501. The paper presser 601 of this embodiment includes a roller case 632 that is supported by a support shaft 602 so as to be movable. A rotation roller shaft 633 passing through the center of the rotation roller 631 is rotatably held inside the roller case 632. At this time, the height of the rotating roller 631 and the height of the fixed paper pressing plate 417 are the same.

  According to the present embodiment, the tractor paper 501 being conveyed and the rotation roller 631 are in contact with each other by a “line”, and the rotation roller 631 in contact with the tractor paper 501 is rotated as the tractor paper 501 is conveyed. Therefore, the frictional resistance due to contact with the tractor paper 501 can be further suppressed.

It is a side view which shows an office machine. It is a perspective view which shows a tractor paper. It is a perspective view which shows the tractor of 1st Embodiment. It is a side view which shows a tractor main part roughly. It is a side view which shows the paper clamp part of 1st Embodiment. It is a perspective view which shows the tractor of 2nd Embodiment. It is a perspective view which shows the tractor of 3rd Embodiment. It is a side view which shows the paper clamp part of 3rd Embodiment. It is a perspective view which shows the tractor paper conveyed by the tractor where the guide surface curved in the concave arc shape.

Explanation of symbols

301 ... Tractor, 401 ... Tractor body, 411 ... Substrate, 413 ... Pin belt, 415 ... Guide surface, 416 ... Open / close paper presser plate (paper presser plate), 417 ... Fixed paper presser plate (paper presser plate), 421 ... Rotating body , 601... Paper presser, 631.

Claims (6)

Formed on both sides of the tractor paper, which is formed on a base having an arcuate curved portion and formed with a guide surface for supporting one surface of the tractor paper, rotating bodies provided at both ends of the base, and the rotating body A pair of tractor bodies having a pin belt in which pins that can be inserted into and removed from the feed holes are formed on the outer peripheral surface, and a paper presser plate that presses the other surface of the tractor paper in which the pins are inserted into the feed holes When,
A drive unit that rotationally drives at least one of the rotating bodies;
A paper presser portion provided between the pair of tractor bodies and provided on the paper presser plate side of the curved portion of the guide surface, and presses the other side of the tractor paper;
A tractor comprising.   2. The tractor according to claim 1, further comprising a support mechanism that supports the paper holding portion so that the position of the paper pressing portion is movable in a direction parallel to a central axis of the rotating body between the pair of tractor bodies.   The tractor according to claim 2, further comprising a first positioning mechanism that disposes the paper pressing portion at an intermediate position between the pair of tractor bodies. It has a plurality of the paper pressing part,
The tractor according to claim 2, further comprising a second positioning mechanism that arranges the plurality of paper pressing portions symmetrically with respect to a line passing through an intermediate position between the pair of tractor bodies.   5. The tractor according to claim 3, wherein the paper pressing unit includes a rotation roller that is supported in parallel with a central axis of the rotating body and presses the tractor paper. The tractor according to any one of claims 1 to 5, wherein at least one of the paper pressing portions is provided at an intermediate position between the pair of tractor main bodies.

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