EP1757459B1 - Bilderzeugungsgerät - Google Patents

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Publication number
EP1757459B1
EP1757459B1 EP06252978A EP06252978A EP1757459B1 EP 1757459 B1 EP1757459 B1 EP 1757459B1 EP 06252978 A EP06252978 A EP 06252978A EP 06252978 A EP06252978 A EP 06252978A EP 1757459 B1 EP1757459 B1 EP 1757459B1
Authority
EP
European Patent Office
Prior art keywords
gear
rotating arm
support shaft
driven gear
spring portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP06252978A
Other languages
English (en)
French (fr)
Other versions
EP1757459A3 (de
EP1757459A2 (de
Inventor
Daisuke Shimizu
Daisuke Takasaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Funai Electric Co Ltd
Original Assignee
Funai Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Funai Electric Co Ltd filed Critical Funai Electric Co Ltd
Publication of EP1757459A2 publication Critical patent/EP1757459A2/de
Publication of EP1757459A3 publication Critical patent/EP1757459A3/de
Application granted granted Critical
Publication of EP1757459B1 publication Critical patent/EP1757459B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/02—Rollers
    • B41J13/025—Special roller holding or lifting means, e.g. for temporarily raising one roller of a pair of nipping rollers for inserting printing material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/02—Rollers
    • B41J13/076—Construction of rollers; Bearings therefor

Definitions

  • the present invention relates to an image generating apparatus, and more particularly, it relates to an image generating apparatus comprising a rotating arm capable of rotating a gear while rotatably (swingably) supporting the same.
  • a drive transmission device provided with a swing member (rotating arm) capable of rotating a gear while rotatably (swingably) supporting the same is known in general, as disclosed in Japanese Patent Laying-Open Nos. 2004-225761 and 9-60705 (1997 ), for example.
  • the aforementioned Japanese Patent Laying-Open No. 2004-225761 describes a drive transmission device capable of transmitting driving force of a driving gear (drive gear) to a driven gear (take-up gear) through a swing gear (driven gear).
  • a swing member rotating arm
  • This swing member swings through a spring and a wire provided independently thereof. More specifically, the spring so urges the swing member that the swing gear meshes with the driving gear, while the wire so pulls the swing member that the swing gear separates from the driving gear.
  • the spring urges the swing member so that the swing gear swings to mesh with the driving gear.
  • the driving force of the driving gear is transmitted to the driven gear.
  • the aforementioned Japanese Patent Laying-Open No. 9-60705 describes a drive transmission device capable of transmitting driving force of a driving gear (drive gear) to a driven gear (take-up gear) through a planetary gear (driven gear), similarly to the aforementioned Japanese Patent Laying-Open No. 2004-225761 .
  • a magnetizing material is added to the planetary gear while a swing member (rotating arm) rotatably supporting the planetary gear is constituted of a magnetizable material, thereby increasing frictional force between the planetary gear and the swing member.
  • the swing member swings in the direction of rotation of the driving gear, so that the planetary gear meshes with the driving gear for transmitting the driving force of the driving gear to the driven gear.
  • a thermal transfer printer is generally known as an exemplary image generating apparatus comprising a rotating arm capable of rotating a gear while rotatably (swingably) supporting the same.
  • Fig. 16 is a perspective view showing the overall structure of an exemplary conventional thermal transfer printer.
  • Fig. 17 is a front elevational view showing respective motors and respective gears of the conventional thermal transfer printer shown in Fig. 16 .
  • Figs. 18 to 21 are diagrams for illustrating the structure of the conventional thermal transfer printer shown in Fig. 16 in detail. The structure of the conventional thermal transfer printer is described with reference to Figs. 16 to 21 .
  • the conventional thermal transfer printer comprises a chassis 101 of metal, a feed roller 102 of metal for feeding a paper, a press roller 103 of metal coming into contact with the feed roller 102 with prescribed pressing force, a feed roller bearing 104 rotatably supporting the feed roller 102, a press roller bearing 105 rotatably supporting the press roller 103, a bearing support plate 106 of metal supporting the press roller bearing 105, a print head 107 for printing, a take-up reel 108 for taking up an ink sheet, a feed roller gear 109, a swing gear portion 110 mounted with a swing gear 110a, a motor bracket 111, a motor 112 for driving the feed roller 102 and the take-up reel 108, a motor 113 for driving the print head 107, and intermediate gears 114 and 115 (see Fig. 17 ).
  • the chassis 101 has first and second side surfaces 101a and 101b.
  • the motor bracket 111 is mounted on the first side surface 101a of the chassis 101.
  • a slot-shaped inhibiting portion 101c is provided on the first side surface 101a of the chassis 101 for inhibiting the swing gear portion 110 from rotating beyond a constant quantity.
  • a cartridge receiving hole 101d is provided on the second side surface 101b of the chassis 101 for receiving an ink sheet cartridge (not shown).
  • a D-shaped gear insert portion 102a is provided on the feed roller 102.
  • This gear insert portion 102a of the feed roller 102 is fitted into the feed roller gear 109 not to idle, as shown in Figs. 17 and 20 .
  • the press roller bearing 105 mounted on the bearing support plate 106 rotatably supports the press roller 103, as shown in Fig. 16 .
  • the print head 107 is mounted inside the first and second side surfaces 101a and 101b of the chassis 101, to be rotatable about a support shaft 107a.
  • a gear portion 108a of the take-up reel 108 is so arranged as to mesh with the swing gear 110a of the swing gear portion 110, regularly meshing with the feed roller gear 109, upon swinging of the swing gear 110a.
  • a shaft portion 109a (see Fig. 21 ) of the feed roller gear 109 is provided with a D-shaped mounting hole 109b, into which the gear insert portion 102a of the feed roller 102 is press-fitted.
  • the swing gear portion 110 has the swing gear 110a of resin, a rotating arm 110b rotatably supporting the swing gear 110a, a helical compression spring 110c pressing the rotating arm 110b with prescribed pressing force and an E-ring 110d.
  • the swing gear 110a is provided with a small-diametral gear portion 110e meshing with the feed roller gear 109 (see Figs. 19 and 20 ), a large-diametral gear portion 110f meshing with the gear portion 108a (see Fig. 17 ) of the take-up reel 108 and a receiving hole 110h (see Fig. 18 ) receiving a support shaft 110g of the rotating arm 110b.
  • the rotating arm 110b is provided with the support shaft 110g for rotatably supporting the swing gear 110a, a boss 110i fitted into the slot-shaped inhibiting portion 101c (see Fig. 17 ) provided on the first side surface 101a of the chassis 101 and a feed roller receiving hole 110j rotatably receiving the feed roller 102.
  • the support shaft 110g of the rotating arm 110b is provided with a groove 110k to be mounted with the E-ring 110d.
  • the helical compression spring 110c presses the rotating arm 110b and the swing gear 110a in a thrust direction (axial direction), so that the swing gear 110a is hard to rotate.
  • the swing gear 110a moves in the direction of this rotation, thereby rotating the rotating arm 110b mounted on the swing gear 110a.
  • the E-ring 110d is mounted on the groove 110k (see Figs. 18 and 21 ) provided on the support shaft 110g of the rotating arm 110b, in order to prevent the swing gear 110a from falling resulting from the pressing force of the helical compression spring 110c.
  • the driving force of the motor 112 for driving the feed roller 102 and the take-up reel 108 is transmitted to the feed roller gear 109 and the gear portion 108a of the take-up reel 108 through the intermediate gears 114 and 115.
  • the thermal transfer printer drives the motor 112 for driving the feed roller 102 and the take-up reel 108 to rotate a motor gear 112a (see Fig. 17 ) mounted on the motor 112 along arrow A2 in Fig. 17 thereby rotating the feed roller gear 109 along arrow B2 in Fig. 17 through the intermediate gears 114 and 115, as shown in Figs. 16 and 17 .
  • the feed roller gear 102 carries the paper (not shown) along arrow C2 in Fig. 16 , as shown in Fig. 16 .
  • the rotating arm 110b rotates along arrow D2 in Fig.
  • the motor 113 for driving the print head 107 rotates the print head 107 in a direction for separating from the paper (along arrow E2 in Fig. 16 ), as shown in Fig. 16 .
  • the thermal transfer printer drives the motor 112 for driving the feed roller 102 and the take-up reel 108 to rotate the motor gear 112a (see Fig. 17 ) mounted on the motor 112 along arrow F2 in Fig. 17 thereby rotating the feed roller gear 109 along arrow G2 in Fig. 17 through the intermediate gears 114 and 115, as shown in Figs. 16 and 17 .
  • the feed roller 102 carries the paper (not shown) along arrow H2 in Fig. 16 , as shown in Fig. 16 .
  • the rotating arm 110b rotates along arrow I2 in Fig.
  • the take-up reel 108 rotates along arrow K2 in Fig. 16 , thereby taking up the ink sheet (not shown).
  • the motor 113 for driving the print head 107 rotates the print head 107 in a direction (along arrow L2 in Fig. 16 ) for pressing the ink sheet and the paper, as shown in Fig. 16 . Consequently, the thermal transfer printer prints an image on the paper.
  • the conventional thermal transfer printer shown in Figs. 16 to 21 must be provided with the helical compression spring 110c, in order to rotate the rotating arm 110b while rendering the driven gear 110a hard to rotate through resistance (frictional force) resulting from the load applied by the helical compression spring 110c in the axial direction (thrust direction). Therefore, the number of components is disadvantageously increased.
  • the drive transmission device described in the aforementioned Japanese Patent Laying-Open No. 2004-225761 must be provided with the spring and the wire independently of the swing member in order to swing the swing member, and hence the number of components is disadvantageously increased.
  • the drive transmission device described in the aforementioned Japanese Patent Laying-Open No. 9-60705 increases the frictional force between the planetary gear and the swing member by constituting the swing member (rotating arm) of the magnetizable material while separately adding the magnetizing material to the planetary gear (driven gear).
  • the number of components is disadvantageously increased since the magnetizing material must be separately added to the planetary gear.
  • WO84/00725 discloses a device for displaceably and rotatably mounting a roller on a shaft, the roller including a plastic sleeve having at its ends circular axial recesses. The roller is mounted on a journaling sleeve which is itself mounted on the shaft and which has a tongue resiliently engaging with a flat surface on the shaft.
  • US 3966276 discloses a bushing comprising a substantially cylindrical portion at one end and a frustoconical resilient portion at the other end. A plurality of angularly spaced radial and longitudinal slots are formed in the resilient portion.
  • the present invention has been proposed in order to solve the aforementioned problems, and an object of the present invention is to provide an image generating apparatus capable of rotating and rotatably (swingably) supporting a gear while reducing the number of components.
  • an image generating apparatus comprises: a normally and reversely rotatable drive gear; a driven gear meshing with the drive gear; and a rotating arm of resin integrally provided with:
  • the rotating arm of resin is integrally provided with the spring portion outwardly inclined by the prescribed angle with respect to the extensional direction of the support shaft so that the integrally provided spring portion urges the driven gear rotatably mounted on the support shaft, thereby causing frictional force between the driven gear and the support shaft.
  • the rotating arm mounted with the driven gear can rotate in the direction of rotation of the drive gear due to the frictional force.
  • the rotating arm is rotatable through the frictional force resulting from the urging force of the integrally provided spring portion, whereby no helical compression spring or the like may be separately provided for rotating the rotating arm. Consequently, the number of components can be reduced.
  • the aforementioned image generating apparatus preferably further comprises an ink sheet for printing an image on a paper and a take-up gear for taking up the ink sheet, while the support shaft of the rotating arm is preferably formed with an arcuate outer peripheral portion at least by half on a region other than that formed with the spring portion, the rotating arm preferably rotates in the direction of rotation of the drive gear due to frictional force between the driven gear and the support shaft caused bv the spring portion urging the driven gear, and the rotating arm is preferably rotatable between a position in which the driven gear meshes with the take-up gear and a position in which the driven gear does not mesh with the take-up gear.
  • the driven gear can stably rotate about the support shaft as compared with a support shaft formed with an outer peripheral portion less than by half.
  • the support shaft of the rotating arm can stably rotatably support the driven gear despite the spring portion integrally provided thereon.
  • the spring portion of the rotating arm is preferably integrally provided with a stop portion for inhibiting the driven gear from slipping off the support shaft.
  • the stop portion integrally provided on the spring portion can inhibit the driven gear from axial slippage, whereby no E-ring is necessary for inhibiting the driven gear from axial slippage, and the support shaft of the rotating arm may not be grooved for receiving such an E-ring. Consequently, the number of components can be further reduced, and the number of assembling steps can also be reduced.
  • the driven gear preferably further includes a receiving hole receiving the support shaft and the spring portion of the rotating arm, and the stop portion is preferably provided with a hook engaging with an edge of the driven gear.
  • the stop portion provided on the spring portion can easily engage with the driven gear for easily inhibiting the driven gear from axial slippage due to the engagement therebetween.
  • the driven gear preferably further includes a receiving hole receiving the support shaft and the spring portion of the rotating arm
  • the spring portion preferably further includes a shaft portion arranged along the axial direction of the receiving hole of the driven gear and provided with the stop portion on an end thereof, and the axial length of the shaft portion of the spring portion is preferably substantially identical to the axial length of the receiving hole of the driven gear. According to this structure, the image generating apparatus can inhibit the driven gear from moving along the axial direction of the shaft portion of the spring portion.
  • the driven gear preferably further includes a receiving hole receiving the support shaft and the spring portion of the rotating arm, and the shaft portion of the spring portion is preferably in surface contact with and is so formed as to urge the inner surface of the receiving hole of the driven gear.
  • the spring portion can stably supply urging force to the inner surface of the receiving hole of the driven gear, thereby easily causing frictional force between the driven gear and the support shaft. Consequently, the rotating arm can easily rotate in the direction of rotation of the drive gear.
  • the spring portion is preferably substantially parallel to the axial direction of the receiving hole of the driven gear. According to this structure, an axially extending portion of the outer peripheral surface of the shaft portion of the spring portion can entirely come into contact with and urge the inner surface of the receiving hole of the driven gear while the spring force is inserted into the receiving hole of the driven gear.
  • the support shaft and the spring portion of the rotating arm preferably have arcuate outer peripheral portions respectively, and the arcuate outer peripheral portions of the bottoms of the spring portion and the support shaft are preferably substantially arranged on the circumference of a circle.
  • the arcuate outer peripheral portion of the spring portion capable of coming into contact with the inner surface of the receiving hole of the driven gear from the bottom, can be easily substantially arranged parallelly to the axial direction of the receiving hole of the driven gear when the support shaft and the spring portion of the rotating arm are inserted into the receiving hole of the driven gear.
  • the driven gear preferably further includes a receiving hole receiving the support shaft and the spring portion of the rotating arm, and the spring portion is preferably so formed as to urge the inner surface of the receiving hole in the direction intersecting with the axial direction of the support shaft.
  • the spring portion can easily urge the inner surface of the driven gear when the support shaft and the spring portion of the rotating arm are inserted into the receiving hole of the driven gear, thereby easily causing frictional force between the driven gear and the support shaft.
  • the support shaft of the rotating arm preferably has an arcuate outer peripheral portion, and the spring portion is preferably arranged at a prescribed interval from the arcuate outer peripheral portion of the support shaft.
  • the image generating apparatus can inhibit the spring portion from coming into contact with the arcuate outer peripheral portion of the support shaft, so that the spring portion is not hard to move.
  • the image generating apparatus can suppress reduction of the urging force of the spring portion on the driven gear.
  • the rotating arm preferably further includes a regulating portion for regulating the quantity of rotation of the rotating arm, and a reinforcing rib is preferably formed on a peripheral portion of the regulating portion of the rotating arm for suppressing deformation of the rotating arm.
  • the image generating apparatus can suppress deformation of the rotating arm also when large force is applied to the regulating portion thereof.
  • thermal transfer printer The structure of a thermal transfer printer according to the embodiment of the present invention is described with reference to Figs. 1 to 15 . According to this embodiment, the present invention is applied to the thermal transfer printer, which is an exemplary image generating apparatus.
  • the thermal transfer printer comprises a chassis 1 of metal, a feed roller 2 of metal for feeding a paper, a press roller 3 of metal coming into contact with the feed roller 2 with prescribed pressing force, a feed roller bearing 4 rotatably supporting the feed roller 2, a press roller bearing 5 rotatably supporting the press roller 3, a bearing support plate 6 of metal supporting the press roller bearing 5, a print head 7 for printing, a take-up reel 8 for taking up an ink sheet 16a, a swing gear portion 10 mounted with a swing gear 10a, a motor bracket 11, a motor 12 for driving the feed roller 2 and the take-up reel 8, a motor 13 for driving the print head 7, and intermediate gears 14 and 15 (see Fig. 2 ).
  • the feed roller gear 9 is an example of the "drive gear” in the present invention
  • the swing gear 10a of the swing gear portion 10 is an example of the "driven gear” in the present invention.
  • the chassis 1 has first and second side surfaces 1a and 1b.
  • the motor bracket 11 is mounted on the first side surface 1a of the chassis 1.
  • a slot-shaped inhibiting portion 1c is provided on the first side surface 1a of the chassis 1 for inhibiting the swing gear portion 10 from rotating beyond a constant quantity.
  • a cartridge receiving hole 1d is provided on the second side surface 1b of the chassis 1 for receiving an ink sheet cartridge 16.
  • a D-shaped gear insert portion 2a is provided on the feed roller 2.
  • This gear insert portion 2a of the feed roller 2 is fitted into the feed roller gear 9 not to idle, as shown in Figs. 2 and 3 .
  • the press roller bearing 5 mounted on the bearing support plate 6 rotatably supports the press roller 3, as shown in Fig. 1 .
  • the print head 7 is mounted inside the first and second side surfaces 1a and 1b of the chassis 1, to be rotatable about a support shaft 7a.
  • a gear portion 8a of the take-up reel 8 is so arranged as to mesh with the swing gear 10a of the swing gear portion 10, regularly meshing with the feed roller gear 9, upon swinging of the swing gear 10a.
  • the gear portion 8a of the take-up gear 8 is an example of the "take-up gear" in the present invention.
  • a shaft portion 9a (see Fig. 8 ) of the feed roller gear 9 is provided with a D-shaped mounting hole 9b, into which the gear insert portion 2a of the feed roller 2 is press-fitted.
  • the shaft portion 9a of the feed roller gear 9 is provided with an arm support portion 9c having an outer diameter smaller than that of the shaft portion 9a of the feed roller gear 9.
  • the swing gear portion 10 has the swing gear 10a of resin and a rotating arm 10b of resin rotatably supporting the swing gear 10a.
  • the resin is prepared from polyacetal resin (POM).
  • the swing gear 10a of the swing gear portion 10 is provided with a small-diametral gear portion 10c meshing with the feed roller gear 9, a large-diametral gear portion 10d meshing with the gear portion 8a (see Fig. 2 ) of the take-up reel 8 and a receiving hole 10e receiving a support shaft 10f of the rotating arm 10b.
  • the rotating arm 10b is provided with the support shaft 10f for rotatably supporting the swing gear 10a, a spring portion 10g urging the inner surface of the receiving hole 10e of the swing gear 10a, a boss 10h fitted into the slot-shaped inhibiting portion 1c (see Fig. 2 ) provided on the first side surface 1a of the chassis 1, a hole-shaped rotation fulcrum portion 10i mounted on the arm support portion 9c provided on the shaft portion 9a (see Fig. 8 ) of the feed roller gear 9 and a reinforcing rib 10j arranged on the peripheral portion of the boss 10h for suppressing deformation of the rotating arm 10b.
  • the boss 10h is an example of the "regulating portion" in the present invention.
  • the support shaft 10f of the rotating arm 10b has an arcuate outer peripheral portion of about 300° as viewed from the axial direction of the support shaft 10f, as shown in Fig. 13 .
  • the spring portion 10g is integrally provided on the rotating arm 10b on a region other than that formed with the support shaft 10f, as shown in Figs. 5 , 7 , 12 and 13 .
  • This spring portion 10g is outwardly inclined by a prescribed angle ⁇ with respect to the extensional direction of the support shaft 10f, as shown in Fig. 12 .
  • the spring portion 10g urges the inner surface of the receiving hole 10e of the swing gear 10a in a direction intersecting with the axial direction of the support shaft 10f with a load of about 10 g, for causing frictional force between the swing gear 10a and the support shaft 10f.
  • the spring portion 10g is constituted of a shaft portion 10k and a stop portion 101 provided on the forward end of the shaft portion 10k.
  • the spring portion 10g is substantially parallel to the axial direction of the receiving hole 10e of the swing gear 10a when the swing gear 10a of the rotating arm 10b is fitted with the support shaft 10f and the spring portion 10g, as shown in Fig. 11 .
  • an axially extending portion of the outer peripheral surface of the shaft portion 10k (see Fig. 12 ) of the spring portion 10g entirely comes into contact with and urges the inner surface of the receiving hole 10e of the swing gear 10a.
  • the axial length of the shaft portion 10k of the spring portion 10g is substantially identical to that of the receiving hole 10e of the swing gear 10a.
  • the shaft portion 10k of the spring portion 10g has an arcuate outer peripheral portion as viewed from the axial direction of the support shaft 10f, as shown in Figs. 7 and 13 .
  • the arcuate outer peripheral portions of the bottoms of the spring portion 10g and the support shaft 10f are substantially arranged on the circumference of a circle 01.
  • a hook 10m (see Fig. 14 ) is provided on the stop portion 101 of the spring portion 10g, as shown in Figs. 3 , 9 , 11, 12 and 14 .
  • this hook 10m of the stop portion 101 engages with an edge 10n of the swing gear 10a when the support shaft 10f and the spring portion 10g of the rotating arm 10b are inserted into the receiving hole 10e of the swing gear 10a, thereby inhibiting the swing gear 10a from slipping off the support shaft 10f of the rotating arm 10b.
  • the driving force of the motor 12 for driving the feed roller 2 and the take-up reel 8 is transmitted to the feed roller gear 9 and the gear portion 8a the take-up reel 8 through the intermediate gears 14 and 15.
  • the thermal transfer printer drives the motor 12 for driving the feed roller 2 and the take-up reel 8 to rotate a motor gear 12a (see Fig. 2 ) mounted on the motor 12 along arrow A1 in Fig. 2 thereby rotating the feed roller gear 9 along arrow B1 in Fig. 2 through the intermediate gears 14 and 15, as shown in Figs. 1 and 2 .
  • the feed roller gear 2 carries the paper along arrow C1 in Fig. 1 , as shown in Fig. 1 .
  • the spring portion 10g of the rotating arm 10b urges the inner surface of the receiving hole 10e of the swing gear 10a for causing frictional force between the swing gear 10a and the support shaft 10f of the rotating arm 10b, whereby the rotating arm 10b rotates in the direction of rotation of the feed roller gear 9 (along arrow B1 in Fig. 2 ).
  • the rotating arm 10b rotates along arrow D1 in Fig. 2 , so that the swing gear 10a mounted on the support shaft 10f of the rotating arm 10b does not mesh with the gear portion 8a of the take-up reel 8. Therefore, the take-up reel 8 remains unrotational, not to take up the ink sheet 16a.
  • the motor 13 for driving the print head 7 rotates the print head 7 in a direction for separating from the paper (along arrow E1 in Fig. 1 ), as shown in Fig. 1 .
  • the rotating arm 10b rotates along arrow B1 so that the boss 10h thereof comes into contact with the slot-shaped inhibiting portion 1c provided on the first side surface 1a of the chassis 1, the inhibiting portion 1c inhibits the rotating arm 10b from rotating along arrow B1.
  • the thermal transfer printer drives the motor 12 for driving the feed roller 2 and the take-up reel 8 to rotate the motor gear 12a (see Fig. 2 ) mounted on the motor 12 along arrow F1 in Fig. 2 thereby rotating the feed roller gear 9 along arrow G1 in Fig. 2 through the intermediate gears 14 and 15, as shown in Figs. 1 and 2 .
  • the feed roller 2 carries the paper along arrow H1 in Fig. 1 , as shown in Fig. 1 .
  • the spring portion 10g of the rotating arm 10b urges the inner surface of the receiving hole 10e of the swing gear 10a for causing frictional force between the swing gear 10a and the support shaft 10f of the rotating arm 10b, whereby the rotating arm 10b rotates in the direction of rotation of the feed roller gear 9 (along arrow G1 in Fig. 2 ).
  • the rotating arm 10b rotates along arrow I1 in Fig. 2 , whereby the large-diametral gear portion 10d of the swing gear 10a meshes with the gear portion 8a of the take-up reel 8, to rotate along arrow J1 in Fig. 2 . Therefore, the take-up reel 8 rotates along arrow K1 in Fig. 2 , to take up the ink sheet 16a.
  • the motor 13 for driving the print head 7 rotates the print head 7 in a direction (along arrow L1 in Fig. 1 ) for pressing the ink sheet 16a and the paper (not shown), thereby performing printing on the paper.
  • the spring portion 10g outwardly inclined by the prescribed angle with respect to the extensional direction of the support shaft 10f is so integrally provided on the rotating arm 10b of resin that the integrally provided spring portion 10g urges the swing gear 10a thereby causing frictional force between the swing gear 10a and the support shaft 10f when the swing gear 10a is rotatably mounted on the support shaft 10f.
  • the rotating arm 10b mounted with the swing gear 10a can rotate in the direction of rotation of the feed roller gear 9 due to the frictional force.
  • the rotating arm 10b is rotatable through the frictional force resulting from the urging force of the integrally provided spring portion 10g, whereby no helical compression spring or the like may be separately provided for rotating the rotating arm 10b. Consequently, the number of components can be reduced.
  • the support shaft 10f of the rotating arm 10b is formed with the arcuate outer peripheral portion at least by half on the region other than that formed with the spring portion 10g, whereby the swing gear 10a can stably rotate about the support shaft 10f as compared with a support shaft formed with an outer peripheral portion less than by half.
  • the support shaft 10f of the rotating arm 10b can stably rotatably support the swing gear 10a despite the spring portion 10g integrally provided thereon.
  • the spring portion 10g of the rotating arm 10b is so integrally provided with the stop portion 101 for inhibiting the swing gear 10a from slipping off the support shaft 10f that the stop portion 101 can inhibit the swing gear 10a from axial slippage, whereby no E-ring is necessary for inhibiting the swing gear 10a from axial slippage, and the support shaft 10f of the rotating arm 10b may not be grooved for receiving such an E-ring. Consequently, the number of components can be further reduced, and the number of assembling steps can also be reduced.
  • the swing gear 10a is provided with the receiving hole 10e receiving the support shaft 10f and the spring portion 10g of the rotating arm 10b while the stop portion 101 is provided with the hook 10m engaging with the edge 10b of the swing gear 10a after the spring portion 10g is inserted into the receiving hole 10e of the swing gear 10a, whereby the stop portion 101 provided on the spring portion 10g can easily engage with the swing gear 10a for easily inhibiting the swing gear 10a from axial slippage due to the engagement between the swing gear 10a and the stop portion 101.
  • the spring portion 10g is so provided on the rotating arm 10b that the shaft portion 10k of the spring portion 10g comes into surface contact with the inner surface of the receiving hole 10e of the swing gear 10a and urges the inner surface of the receiving hole 10e of the swing gear 10a when the spring portion 10g is inserted into the receiving hole 10e of the swing gear 10a, whereby the spring portion 10g can stably supply urging force to the inner surface of the receiving hole 10e of the swing gear 10a, for easily causing frictional force between the swing gear 10a and the support shaft 10f. Consequently, the rotating arm 10b can easily rotate in the direction of rotation of the feed roller gear 9.
  • the axial length of the shaft portion 10k of the spring portion 10g is rendered substantially identical to that of the receiving hole 10e of the swing gear 10a, so that the thermal transfer printer can inhibit the swing gear 10a from moving along the axial direction of the shaft portion 10k of the spring portion 10g.
  • the arcuate outer peripheral portions of the bottoms of the spring portion 10g and the support shaft 10f are substantially arranged on the circumference of the circle O1 whereby the arcuate outer peripheral portion of the spring portion 10g, capable of coming into contact with the inner surface of the receiving hole 10e of the swing gear 10a from the bottom, can be easily substantially arranged parallelly to the axial direction of the receiving hole 10e of the swing gear 10e when the support shaft 10f and the spring portion 10g of the rotating arm 10b are inserted into the receiving hole 10e of the swing gear 10a.
  • the spring portion 10g is arranged at the prescribed interval from the arcuate outer peripheral portion of the support shaft 10f, whereby the thermal transfer printer can inhibit the spring portion 10g from coming into contact with the arcuate outer peripheral portion of the support shaft 10f, so that the spring portion 10g is not hard to move.
  • the thermal transfer printer can suppress reduction of the urging force of the spring portion 10g on the swing gear 10a.
  • the reinforcing rib 10j is formed on the peripheral portion of the boss 10h of the rotating arm 10b for suppressing deformation of the rotating arm 10b, whereby the thermal transfer printer can suppress deformation of the rotating arm 10b also when large force is applied to the boss 10h thereof.
  • the present invention is not restricted to this but is also applicable to an image generating apparatus other than the thermal transfer printer, so far as the apparatus comprises a structure capable of rotating a gear while rotatably (swingably) supporting the same.
  • the present invention is not restricted to this but the support shaft provided on the rotating arm may simply be formed with an arcuate outer peripheral portion at least by half (180°).
  • the present invention is not restricted to this but the stop portion may alternatively be provided on a member other than the spring member.
  • the stop portion may be integrally provided on the support shaft.
  • a separately formed stop member may be employed for inhibiting the feed roller gear from slipping off the support shaft.
  • the present invention is not restricted to this but the spring portion may alternatively be provided on the rotating arm so that the shaft portion thereof comes into line or point contact with and urges the inner surface of the receiving hole of the swing gear.
  • the rotating arm is provided with the single spring portion in the aforementioned embodiment, the present invention is not restricted to this but the rotating arm may alternatively be provided with two spring portions, as shown in Fig. 15 .
  • the two spring members are preferably provided at regular intervals, as shown in Fig. 15 .
  • the rotating arm may be provided with at least three spring portions at regular intervals.

Landscapes

  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Gear Transmission (AREA)
  • Transmission Devices (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Forging (AREA)
  • Photographic Developing Apparatuses (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Claims (11)

  1. Bilderzeugungsvorrichtung, die Folgendes umfasst:
    ein normal und in die entgegengesetzte Richtung drehbares Antriebszahnrad (9);
    ein getriebenes Zahnrad (10a), das mit dem Antriebszahnrad in Kämmung gebracht ist; und
    einen Dreharm (10b) aus Harz, der einstückig mit folgendem bereitgestellt ist:
    einem Rotationsgelenkabschnitt (10i), der drehbar an dem Antriebszahnrad angebracht ist; einer Lagerwelle (10f), die das getriebene Zahnrad drehbar lagert;
    und einem Federabschnitt (10g), der in einem vorgeschriebenen Winkel in Bezug auf die Ausdehnungsrichtung der Lagerwelle nach außen geneigt ist.
  2. Bilderzeugungsvorrichtung nach Anspruch 1, die ferner ein Farbblatt (16a) zum Drucken eines Bilds auf ein Papier und ein Aufnahmezahnrad (8a) umfasst, um das Farbblatt aufzunehmen, worin
    die Lagerwelle des Dreharms zumindest zur Hälfte in einem anderen Bereich als dem mit dem Federabschnitt ausgebildeten Bereich mit einem gekrümmten Außenumfangsabschnitt ausgebildet ist,
    der Federabschnitt (10g) des Dreharms so ausgebildet ist, dass er das getriebene Zahnrad (10a) so unter Druck setzt, dass das getriebene Zahnrad mit der Lagerwelle durch Reibung in Eingriff gelangt, wobei das getriebene Zahnrad in die Rotationsrichtung des Antriebszahnrads drehbar ist, und
    der Dreharm (10b) zwischen einer Position, in der das getriebene Zahnrad mit dem Aufnahmezahnrad in Kämmung gelangt, und einer Position, in der das getriebene Zahnrad sich nicht mit dem Aufnahmerad in Kämmung befindet, drehbar ist.
  3. Bilderzeugungsvorrichtung nach Anspruch 1, worin
    der Federabschnitt (10g) des Dreharms einstückig mit einem Anschlagsabschnitt (101) bereitgestellt ist, um zu verhindern, dass das getriebene Zahnrad (10a) von der Lagerwelle (10f) rutscht.
  4. Bilderzeugungsvorrichtung nach Anspruch 3, worin
    das getriebene Zahnrad (10a) ferner ein Aufnahmeloch (10e) umfasst, das die Lagerwelle (10f) und den Federabschnitt (10g) des Dreharms aufnimmt, und
    der Anschlagsabschnitt (101) mit einem Haken (10m) bereitgestellt ist, der mit einem Rand (10n) des getriebenen Zahnrads in Eingriff gelangt.
  5. Bilderzeugungsvorrichtung nach Anspruch 3, worin
    das getriebene Zahnrad (10a) ferner ein Aufnahmeloch (10e) umfasst, das die Lagerwelle (10f) und den Federabschnitt (10g) des Dreharms (10b) aufnimmt,
    der Federabschnitt ferner einen Wellenabschnitt (9a) umfasst, der entlang der axialen Richtung des Aufnahmelochs des getriebenen Zahnrads angeordnet ist und an einem Ende mit dem Anschlagsabschnitt (101) bereitgestellt ist, und
    die Achsenlänge des Wellenabschnitts des Federabschnitts im Wesentlichen mit der Achsenlänge des Aufnahmelochs des getriebenen Zahnrads übereinstimmt.
  6. Bilderzeugungsvorrichtung nach Anspruch 1, worin
    das getriebene Zahnrad (10a) ferner ein Aufnahmeloch (10e) umfasst, das die Lagerwelle (10f) und den Federabschnitt (10g) des Dreharms (10b) aufnimmt, und
    der Wellenabschnitt des Federabschnitts in Oberflächenkontakt mit der Innenoberfläche des Aufnahmelochs des getriebenen Zahnrads steht und so ausgebildet ist, dass er gegen diese drückt.
  7. Bilderzeugungsvorrichtung nach Anspruch 6, worin
    der Federabschnitt (10g) im Wesentlichen parallel zu der axialen Richtung des Aufnahmelochs des getriebenen Zahnrads vorliegt.
  8. Bilderzeugungsvorrichtung nach Anspruch 7, worin
    die Lagerwelle (10f) und der Federabschnitt (10g) des Dreharms (10b) jeweils gekrümmte Außenumfangsabschnitte aufweisen und
    der gekrümmte Außenumfangsabschnitt der Unterseite des Federabschnitts und der Lagerwelle im Wesentlichen am Umfang eines Kreises angeordnet sind.
  9. Bilderzeugungsvorrichtung nach Anspruch 1, worin
    das getriebene Zahnrad (10a) ferner ein Aufnahmeloch (10e) umfasst, das die Lagerwelle (10f) und den Federabschnitt (10g) des Dreharms (10b) aufnimmt, und
    der Federabschnitt so ausgebildet ist, dass er die Innenoberfläche des Aufnahmelochs in eine Richtung drückt, die die axiale Richtung der Lagerwelle schneidet.
  10. Bilderzeugungsvorrichtung nach Anspruch 1, worin
    die Lagerwelle (10f) des Dreharms einen gekrümmten Außenumfangsabschnitt aufweist, und
    der Federabschnitt (10g) in einem vorgeschriebenen Abstand von dem gekrümmten Außenumfangsabschnitt der Lagerwelle angeordnet ist.
  11. Bilderzeugungsvorrichtung nach Anspruch 1, worin
    der Dreharm ferner einen Einstellabschnitt (10h) zum Einstellen des Ausmaßes der Rotation des Dreharms umfasst, und
    eine Verstärkungsrippe (10j) an einem Umfangsabschnitt des Einstellabschnitts des Dreharms ausgebildet ist, um eine Verformung des Dreharms zu unterdrücken.
EP06252978A 2005-08-22 2006-06-09 Bilderzeugungsgerät Not-in-force EP1757459B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005239554A JP2007054969A (ja) 2005-08-22 2005-08-22 画像形成装置

Publications (3)

Publication Number Publication Date
EP1757459A2 EP1757459A2 (de) 2007-02-28
EP1757459A3 EP1757459A3 (de) 2009-05-06
EP1757459B1 true EP1757459B1 (de) 2011-03-02

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EP (1) EP1757459B1 (de)
JP (1) JP2007054969A (de)
AT (1) ATE500068T1 (de)
DE (1) DE602006020378D1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5213740B2 (ja) * 2009-01-30 2013-06-19 キヤノン株式会社 駆動伝達装置および給送装置
JP5839520B1 (ja) * 2014-06-25 2016-01-06 サトーホールディングス株式会社 ラベルプリンタ
KR101825144B1 (ko) 2015-11-23 2018-02-06 주식회사 경일테크 연동장치와 이를 갖춘 하이브리드 전사기
CN107471692B (zh) * 2017-07-31 2018-06-05 濮阳市泰普胶粘制品有限公司 一种可旋转的胶带卷去应力加热装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1900102A (en) * 1927-06-25 1933-03-07 Remington Typewriter Co Typewriting machine
FR2324935A2 (fr) 1974-01-11 1977-04-15 Peugeot & Renault Bague-coussinet a auto-rattrapage de jeux dans les paliers
SE440628B (sv) 1982-08-20 1985-08-12 Facit Ab Anordning for forskjutbar och roterbar lagring av en rulle pa en axel
US5051010A (en) * 1989-08-29 1991-09-24 Genicom Corporation Printer and cartridge assembly therefor
US7665379B2 (en) * 2000-11-16 2010-02-23 Robert Bosch Gmbh Gear train element for play-free torque transmission
JP4409178B2 (ja) * 2003-01-21 2010-02-03 株式会社リコー 駆動伝達装置、画像形成装置

Also Published As

Publication number Publication date
EP1757459A3 (de) 2009-05-06
US20070040322A1 (en) 2007-02-22
EP1757459A2 (de) 2007-02-28
DE602006020378D1 (de) 2011-04-14
JP2007054969A (ja) 2007-03-08
ATE500068T1 (de) 2011-03-15

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