JP2006292018A - Drive transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive transmission eliminating fluctuation in rotation due to variation in the parpendicularity of a rotation body to a drive shaft. <P>SOLUTION: The drive transmission transmits the rotation of a rotation drive source to the drive shaft 11 via the rotation body 12, and comprises an adjusting means 17 for adjusting the parpendicularity of the rotation body 12 to the drive shaft 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drive transmission device capable of improving rotation unevenness.

  Conventionally, as shown in FIG. 1, the drive transmission device includes a rotation gear 5 as a rotating body fitted with a drive shaft 4 and a motor pinion 3 attached to an output shaft 2 of a motor 1 as a rotation drive source. Is known that transmits the rotation of the motor 1 to a rotation unit 7 connected to the drive shaft 4 via a coupling member 6.

  The rotating gear 5 has a cylindrical portion 5a as shown in FIG. 1, the drive shaft 4 is inserted through the cylindrical portion 5a, and a press-fit pin 8 is inserted through the cylindrical portion 5a as shown in FIGS. The rotary gear 5 is assembled by being pushed into the drive shaft 4. The drive shaft 4 is rotatably supported by bearing members 9 and 9 provided on both sides of the drive shaft 4 with a rotation gear 5 interposed therebetween.

  In the drive transmission device of this conventional configuration, as shown by a one-dot chain line in FIG. 1, due to manufacturing errors of the rotary gear 5 itself and errors in assembling the rotary gear 5 to the drive shaft 4, Even if the angle variation occurs and the motor pinion 3 and the rotating gear 5 are meshed in parallel as shown in FIG. 4, the rotating gear 5 causes side blurring in the meshing portion 10, as shown in FIG. 5. Two cycles of rotation unevenness occur during one rotation.

  In FIG. 4, the solid line indicates an ideal rotation locus of the outer contour of the rotating gear 5, and the alternate long and short dash line indicates the rotation locus due to the rotation unevenness of the outer contour of the rotating gear 5. A curve K indicates a variation Δ of the distance L from the center Q of the drive shaft 4 to the ideal meshing position of the meshing portion 10 of the rotary gear 5.

  In order to overcome these problems, a similar technique for adjusting the eccentricity of the rotating gear 5 is known as a similar technique for eliminating the rotation unevenness of the rotating gear 5 (see, for example, Patent Document 1).

Further, as a similar technique for reducing the rotation unevenness of the rotation gear 5, a configuration in which the rotation gear 5 is tilted in advance and assembled to the drive shaft 4 is known (for example, see Patent Document 2).
Japanese Patent Laid-Open No. 10-252752 JP 2004-92863 A

  However, in the technique disclosed in Japanese Patent Laid-Open No. 10-252752, even if the eccentricity of the rotating gear 5 itself can be eliminated, the manufacturing error of the rotating gear 5 and the assembling error of the rotating gear 5 to the drive shaft 4 are reduced. The unevenness of the squareness caused by this cannot be eliminated, and rotation unevenness having an amplitude of two cycles occurs during one rotation. Therefore, in a precision driving device such as a color image forming apparatus, color overlay accuracy deteriorates.

  Further, the technique disclosed in Japanese Patent Application Laid-Open No. 2004-92863 can reduce the rotation unevenness of the rotating gear 5, but it does not necessarily eliminate the rotation unevenness.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a drive transmission device capable of eliminating rotation unevenness caused by variation in perpendicularity to a drive shaft of a rotating body. There is to do.

  The drive transmission device according to claim 1, wherein in the drive transmission device that transmits the rotation of the rotational drive source to the drive shaft through the rotating body, an adjustment unit that adjusts the perpendicularity between the driving shaft and the rotating body is provided. It is characterized by being.

  The drive transmission device according to claim 2, wherein the adjusting means includes an eccentric member, the rotating body includes a fitting groove that is fitted to the eccentric member, and rotation transmission from the rotating body to the drive shaft is performed. It is performed by fitting the eccentric member and the fitting groove.

  According to a third aspect of the present invention, in the drive transmission device, the adjustment means includes adjustment members provided in three directions at intervals of 120 degrees in the circumferential direction of the drive shaft.

  According to a fourth aspect of the present invention, there is provided the drive transmission device according to the fourth aspect, wherein the adjustment means is provided at an interval of 120 degrees in the circumferential direction of the drive shaft and a reference provided at an interval of 120 degrees from both adjustment members. It consists of members.

  In the drive transmission device according to claim 5, a through hole through which the drive shaft passes is formed in the rotating body, and the through hole has a large hole diameter on both sides in the thickness direction of the rotating body. The shape is such that the diameter of the hole gradually decreases toward the inside in the vertical direction, and the drive shaft and the peripheral wall of the through hole of the rotating body are in line contact.

  The drive transmission device according to claim 6 is a transmission device that transmits rotation of a drive source to a drive shaft in which a rotation transmission flange disc is press-fitted and fixed via a rotating body, and the rotation transmission flange disc includes the drive shaft. A pair of mounting arm plate portions are formed at intervals of 120 degrees in the circumferential direction, and a through-hole through which the drive shaft passes is formed at the center of the rotating body, and the rotation transmission A fitting groove corresponding to the pair of mounting flanges is formed on the side facing the flange plate, an adjustment member is provided on the pair of mounting plate portions, and the adjustment member includes a roller and an adjustment screw. The center of the screw and the center of the roller are eccentric, and the perpendicularity of the rotating body with respect to the drive shaft is adjusted by adjusting the amount of protrusion from the rotation transmission flange plate toward the rotating body by adjusting the adjusting screw. Adjust After, wherein the clamping fixing the roller to the pair of mounting arm plate portions.

  According to the first to sixth aspects of the present invention, it is possible to eliminate the rotation unevenness caused by the side blur of the rotating body due to the variation in the perpendicularity with respect to the drive shaft of the rotating body. It is possible to reduce the machining accuracy of each component of the transmission device, thereby reducing the component cost.

  According to the second aspect of the present invention, when the drive shaft and the rotator are assembled, the perpendicularity of the rotator to the drive shaft is eliminated, so that the rotator is assembled and fixed to the drive shaft. Therefore, it is possible to integrate the assembly work and the perpendicularity adjustment work.

  According to the third aspect of the present invention, it is possible to facilitate the perpendicularity adjustment work with respect to the drive shaft of the rotating body.

  According to the invention described in claim 4, it is possible to reduce the number of parts of the adjustment member and shorten the adjustment work time.

  According to the fifth aspect of the present invention, since the peripheral wall of the through hole of the rotating body and the drive shaft are in line contact with each other, it is possible to prevent the occurrence of stress distortion due to the twisting of the rotating body.

  Embodiments of a drive transmission device according to the present invention will be described below with reference to the drawings.

  6 and 7, 11 is a drive shaft, 12 is a rotating gear as a rotating body, and 13 is a rotation transmitting flange board. The rotation transmission flange plate 13 is provided with a cylindrical portion 14, and the drive shaft 11 is press-fitted into the cylinder portion 14 of the rotation transmission flange plate 13. The rotation gear 12 is engaged with a motor pinion attached to an output shaft of a motor as a rotation drive source.

  As shown in FIG. 7, the rotation transmitting flange board 13 has a pair of attachment arm plate portions 15 extending outward in the radial direction. The pair of attachment arm plate portions 15 are formed at intervals of 120 degrees in the circumferential direction of the drive shaft 11. A through hole 16 is formed in the rotating gear 12 as shown in an enlarged manner in FIG. The through hole 16 has a tapered surface shape in which the diameter on both sides in the thickness direction of the rotating gear 12 is large and the diameter gradually decreases toward the inside in the thickness direction.

  The mounting arm plate portion 15 is formed with a U-shaped notch 18 that supports an adjustment member 17 as an adjustment means, as partially enlarged in FIG. As shown in FIGS. 10 to 12, the adjusting member 17 is composed of a roller 18 and a worm screw 19 as an adjusting screw.

  The center O1 of the roller 18 and the center O2 of the screw 19 are eccentric as shown in FIG. 11 and FIG. 12, and the amount of eccentricity is indicated by the symbol a.

  As shown in FIGS. 8, 13, and 14, the rotation gear 12 has a fitting groove 20 on a surface 12 a on the side facing the rotation transmission flange plate 13 so as to correspond to the pair of mounting arm plate portions 15. Is formed.

  As shown in FIG. 6, an E ring member 21 is press-fitted and fixed to the drive shaft 11, and the rotation gear 12 is rotated and transmitted by a coil spring 22 interposed between the E ring member 21 and the rotation gear 12. It is biased in the direction toward 13.

  The perpendicularity of the rotary gear 12 with respect to the drive shaft 11 is adjusted by inserting a roller 18 between the mounting arm plate portion 15 and the rotary gear 12 as shown in FIG. A tool tip of a screwdriver 23 is inserted into a slit 19a formed in the head of the screw 19, and the screwdriver 23 is turned to project the protrusion of the roller 18 from the rotation transmission flange 13 to the rotary gear 12, as shown in FIG. This is done by adjusting a '.

  Since the through hole 16 of the rotary gear 12 has a tapered surface shape and the peripheral wall of the through hole 16 is in line contact with the drive shaft 11, the rotation gear with respect to the drive shaft 11 can be adjusted by adjusting the protrusion amount a ′ of the roller 18. Twelve squareness adjustments are made.

  This squareness adjustment operation is performed for each adjustment member 17 extending in three directions while measuring the squareness of the rotary gear 12 with respect to the drive shaft 11.

  After the adjustment of the squareness is completed, as shown in FIG. 10, the pair of mounting arm plate portions 15 and 15 are tightened with the tightening screw 24, whereby the roller 18 is clamped and fixed to the mounting arm plate portions 15 and 15. Made. The width W1 of the roller 18 is substantially equal to the width W2 of the fitting groove 20 as shown in FIG. 13, and the roller 18 is press-fitted into the fitting groove 20 during the adjustment work.

  As shown in FIG. 14, the transmission of the rotational force of the rotating gear 12 to the drive shaft 11 is performed via the rotation direction peripheral wall 20 a of the fitting groove 20, the roller 18, the pair of mounting arm plate portions 15, and the rotation transmitting flange plate 13. Since the roller 18 and the fitting groove 20 are press-fitted and fitted, the rotation is smoothly transmitted from the rotary gear 12 to the drive shaft 11 without play.

  15 and 16 show a modification of the drive transmission device shown in FIGS. 6 to 14. In the drive transmission device shown in FIG. 15, a pair of mounting arm plate portions projecting in three directions as shown in FIG. A semicircular arc-shaped engagement plate portion 25 as a reference member is fixedly provided on at least one of 15 and is adjusted by an adjustment member 17 provided on the pair of attachment arm plate portions 15 in the remaining two directions. is there.

  According to this modification, it is possible to reduce the number of parts of the adjustment member and shorten the adjustment work time.

It is a figure which shows the outline | summary of the conventional drive transmission apparatus. It is sectional drawing which shows the coupling | bonding relationship of the drive shaft shown in FIG. 1, and a rotation gear. FIG. 3 is a plan view showing a state in which the drive shaft and the rotation gear shown in FIG. 2 are connected by a press-fit pin. It is a figure for demonstrating the rotation nonuniformity of the rotation gear shown in FIG. It is the figure which showed the rotation nonuniformity of the rotation gear shown in FIG. 4 with the sine curve. It is a figure which shows the outline | summary of the rotation transmission apparatus concerning this invention. FIG. 7 is a plan view showing a coupling relationship between a drive shaft and a rotary gear shown in FIG. 6. FIG. 7 is a partially enlarged cross-sectional view illustrating a relationship among a drive shaft, a rotation transmission flange disk, and a rotation gear illustrated in FIG. 6. It is the elements on larger scale of the attachment arm board part shown in FIG. It is a principal part enlarged view which expands and shows the adjustment member fixed to a pair of attachment arm board part shown in FIG. It is explanatory drawing of the eccentric relationship with a roller and a potato screw shown in FIG. It is explanatory drawing for demonstrating adjustment of the protrusion amount of the roller from the rotation transmission flange board shown in FIG. It is a figure for demonstrating the dimensional relationship of the fitting groove and roller shown in FIG. It is explanatory drawing of the rotation transmission to the drive shaft of a rotation gear. It is a figure for demonstrating the modification of the drive transmission apparatus shown in FIG. FIG. 7 is a partial view showing a modified example of a pair of attachment arm portions of the drive transmission device shown in FIG. 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Drive shaft 12 ... Rotating body 17 ... Adjustment member (Adjustment means)

Claims (6)

  A drive transmission device for transmitting rotation of a rotary drive source to a drive shaft through a rotating body, wherein an adjustment means for adjusting a perpendicularity between the drive shaft and the rotating body is provided. .   The adjusting means has an eccentric member, the rotating body has a fitting groove fitted into the eccentric member, and rotation transmission from the rotating body to the drive shaft is fitted between the eccentric member and the fitting groove. The drive transmission device according to claim 1, wherein the drive transmission device is performed in combination.   The drive transmission device according to claim 1, wherein the adjustment unit includes an adjustment member provided in three directions at intervals of 120 degrees in a circumferential direction of the drive shaft.   4. The adjusting means includes an adjusting member provided at an interval of 120 degrees in a circumferential direction of the drive shaft and a reference member provided at an interval of 120 degrees from both adjusting members. The drive transmission device described in 1.   A through hole through which the drive shaft passes is formed in the rotating body, and the through hole has a large hole diameter on both sides in the thickness direction of the rotating body, and the temporary hole diameter increases toward the inside in the thickness direction of the rotating body. The drive transmission device according to claim 3, wherein the driving shaft and the through hole peripheral wall of the rotating body are in line contact with each other.   A transmission device for transmitting rotation of a drive source to a drive shaft on which a rotation transmission flange disk is press-fitted and fixed via a rotating body, and the rotation transmission flange disk is spaced at intervals of 120 degrees in the circumferential direction of the drive shaft. A pair of mounting arm plate portions are formed by opening, and a through hole through which the drive shaft passes is formed at the center of the rotating body, and the pair of mounting arm plate portions is formed on the side facing the rotation transmission flange plate. A fitting groove corresponding to the mounting flange is formed, and an adjustment member is provided on the pair of mounting plate portions. The adjustment member includes a roller and an adjustment screw, and the center of the adjustment screw and the center of the roller are eccentric. And adjusting the perpendicularity of the rotating body with respect to the drive shaft by adjusting the amount of protrusion from the rotation transmission flange plate toward the rotating body by adjusting the adjusting screw, and then removing the pair of rollers. With Drive transmission and wherein the sandwiching fixed to the arm plate portion.

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