JP6971663B2 - Anti-vibration mount and image forming device - Google Patents

Description

The present invention relates to a vibration-proof mount that suppresses vibration generated when a vibration source such as various motors is driven from being transmitted to a supported body, and an image forming apparatus equipped with the vibration-proof mount.

Stepping motors are used in the paper feed mechanism of copiers and the print heads of personal computer printers. Since this stepping motor is a vibration source that generates vibration by driving it, it may be attached to the frame of the airframe as described above via an anti-vibration mount.

14 (a) is a cross-sectional view showing a mounted state of the conventional anti-vibration mount 100, and FIG. 14 (b) is an arrow view in the direction of arrow X in FIG. 14 (a). As shown in FIG. 14, the vibration-proof mount 100 has an elastic layer 103 made of a rubber-like elastic material integrally between a mounting plate 101 mounted on a frame 200 and a mounting plate 102 mounted on a stepping motor 300. It is a provided configuration. As a result, the vibration generated when the stepping motor 300 is driven is absorbed by the deformation operation of the elastic layer 103, and the vibration transmission to the frame 200 side is reduced.

Here, the drive torque of the stepping motor 300 is transmitted from the rotary shaft 301 to the driven side via the pinion gear 302 and the driven gear 303 that meshes with the pinion gear 302. Therefore, in the stepping motor 300, a prying displacement (swing around one point on the axis) occurs due to the reaction force of torque transmission. For example, as shown in FIG. 15A, when the rotating shaft 301 of the stepping motor 300 rotates in the direction of arrow R1, it rotates due to the reaction force in the direction of arrow F1 accompanying the torque transmission from the pinion gear 302 to the driven gear 303. A prying displacement in the direction of arrow S1 occurs on the shaft 301. In this case, the vibration-proof mount 100 is twisted and displaced, and the elastic layer 103 is deformed by receiving loads in the compression direction and the tension direction.

On the other hand, in order to increase the rigidity of the vibration-proof mount 100 against the prying displacement, it is effective to use a rubber-like elastic material having high hardness as the elastic layer 103. However, in that case, the shear spring constant in the twisting direction (circumferential direction) of the elastic layer 103 also becomes high. Further, in general, the higher the hardness of the rubber-like elastic material, the higher the dynamic magnification tends to be (the dynamic spring becomes higher than the static spring). Therefore, when a rubber-like elastic material having a high hardness is used, the effect of suppressing the torsional vibration, which is a dynamic input, is reduced and the vibration is easily transmitted, even though the rigidity against the prying displacement is improved.

Therefore, Patent Document 1 proposes a structure for ensuring the effect of suppressing torsional vibration and increasing the rigidity against prying displacement in the vibration-proof mount. FIG. 15B is a cross-sectional view of the anti-vibration mount 100 according to Patent Document 1. As shown in FIG. 15B, the anti-vibration mount 100 is fitted to the elastic layer 103 formed between the mounting plates 101 and 102, and is in contact with the mounting plates 111 and 112 and is non-adhesive. It has an annular elastic body 114 made of a rubber-like elastic material arranged in. When the vibration-proof mount 100 is subjected to a prying displacement, the annular elastic body 114 is also compressed when the elastic layer 113 is compressed to some extent on the side where the mounting plates 111 and 112 are close to each other. Increases rigidity. Further, since the shear spring in the torsion direction is substantially carried only by the elastic layer 113, the effect of suppressing the torsional vibration is ensured and the vibration isolation performance is ensured.

Japanese Unexamined Patent Publication No. 2008-291936

However, in the configuration described in Patent Document 1, since the annular elastic body 114 is separately provided in order to increase the rigidity against the prying displacement, the number of parts increases, which leads to the complexity of the configuration and the cost increase.

Therefore, the present invention has been made in view of such a current situation, and a vibration-proof mount capable of ensuring vibration-proof performance against torsional vibration and increasing rigidity against prying displacement of a motor with an inexpensive and simple configuration is provided. The purpose is to provide.

A typical configuration of a vibration-proof mount according to the present invention for achieving the above object has a first plate portion which is attached to a motor and has a first opening through which a rotation shaft of the motor is inserted. a first mounting plate that is attached to a support for supporting the motor, and a second mounting plate that have a second plate portion second opening is formed in which the rotary shaft is inserted, the first A boss that protrudes from at least one of the mounting plate and the second mounting plate toward the other mounting plate, and is arranged at a distance between the mounting plate and the other mounting plate. When the elastic layer having an elastic formed between the cover and Bo scan, the first mounting plate and said second mounting plate and said first mounting plate to connect the second mounting plate, The thickness of the elastic layer between the boss and the other mounting plate is smaller than the thickness of the elastic layer between the first plate portion and the second plate portion. ..

According to the present invention, it is possible to secure anti-vibration performance against torsional vibration and increase rigidity against prying displacement of the motor with an inexpensive and simple configuration.

It is sectional drawing of the image forming apparatus. It is a perspective view of the anti-vibration mount. It is sectional drawing of the vibration-proof mount. It is a perspective view of a mounting plate. It is a perspective view of the state where the stepping motor is attached to the frame via the anti-vibration mount. It is sectional drawing in the state which the stepping motor is attached to the frame via the anti-vibration mount. It is sectional drawing which shows another structure of the anti-vibration mount. It is a perspective view of the anti-vibration mount. It is sectional drawing of the vibration-proof mount. It is a perspective view of a mounting plate. It is a perspective view of the anti-vibration mount. It is sectional drawing of the vibration-proof mount. It is a perspective view of a mounting plate. It is sectional drawing and the front view of the conventional anti-vibration mount. It is sectional drawing of the conventional anti-vibration mount.

(First Embodiment)
<Image forming device>
Hereinafter, the overall configuration of the image forming apparatus A provided with the vibration-proof mount according to the first embodiment of the present invention will be described with reference to the drawings together with the operation at the time of image formation. It should be noted that the dimensions, materials, shapes, relative arrangements, etc. of the components described are not intended to limit the scope of the present invention to those alone unless otherwise specified.

As shown in FIG. 1, the image forming apparatus A includes an image forming unit that transfers a toner image onto a sheet that is a recording medium to form an image, a sheet feeding unit that supplies a sheet to the image forming unit, and a sheet feeding unit. The sheet is provided with a fixing portion for fixing the toner image.

When the control unit (not shown) emits a print signal during image formation, the sheet loading unit 80 is driven by the paper feed roller 79 (conveying member) and the transport roller 78 (conveying member) driven by the stepping motor 3 (see FIG. 5). The sheet S loaded on the image forming unit is sent out to the image forming unit.

In the present embodiment, the stepping motor 3 is attached to the frame 2 which is the main body of the image forming apparatus A via the anti-vibration mount 1 shown in FIG. The configuration of the anti-vibration mount 1 will be described in detail later.

On the other hand, in the image forming portion, the surface of the photoconductor drum 71 is charged by applying a bias to the charging roller 72. After that, the laser scanner unit 73 emits laser light from a light source (not shown), and irradiates the photoconductor drum 71 with the laser light according to the image information. As a result, the potential of the photoconductor drum 71 is partially lowered, and an electrostatic latent image corresponding to the image information is formed on the surface of the photoconductor drum 71.

After that, by applying a bias to the developing sleeve 76 provided in the developing device 74, toner is adhered to the electrostatic latent image formed on the surface of the photoconductor drum 71 from the developing sleeve 76 to form a toner image.

Next, the toner image formed on the surface of the photoconductor drum 71 is sent to the transfer nip portion formed between the photoconductor drum 71 and the transfer roller 75. When the toner image arrives at the transfer nip portion, a bias having a polarity opposite to the charging polarity of the toner is applied to the transfer roller 75, and the toner image is transferred to the sheet S.

After that, the sheet S to which the toner image is transferred is sent to the fixing device 88, and the toner image is heated and pressurized by the fixing device 88 to be fixed on the sheet S. After that, the sheet S is discharged to the discharge unit 83 by the discharge roller 82.

<Anti-vibration mount>
Next, the configuration of the anti-vibration mount 1 will be described.

FIG. 2 is a perspective view of the anti-vibration mount 1, and FIG. 3 is a cross-sectional view taken along the cross section taken along the line AA in FIG. FIG. 4 is a perspective view of the mounting plates 11 and 12 included in the anti-vibration mount 1.

As shown in FIGS. 2 to 4, the anti-vibration mount 1 has a mounting plate 11 (second mounting plate) formed of a steel plate attached to the frame 2 of the image forming apparatus A and a steel plate attached to the stepping motor 3. The mounting plate 12 (first mounting plate) formed of the above is provided. Further, an elastic layer 13 made of a rubber-like elastic material provided integrally with the mounting plates 11 and 12 is provided. The hardness of the rubber-like elastic layer 13 is preferably in the range of Hs40 to 85 (JIS spring type).

A circular inner peripheral opening 11a is formed in the mounting plate 11. A rotating shaft 31 that is rotated by the rotation of the stepping motor 3 is inserted into the opening of the inner peripheral opening 11a. Further, two screw insertion holes 11b are provided along the outer edge portion at appropriate intervals. Further, around the inner peripheral opening 11a, four bosses 11c protruding toward the mounting plate 12 are provided at 90 ° intervals. The boss 11c is arranged at a distance (distance) of about 0.5 mm between the tip portion thereof and the mounting plate 12, and the outer peripheral surface is covered with the elastic layer 13. In this embodiment, the boss 11c is formed by embossing.

The distance between the tip of each of the plurality of bosses 11c and the mounting plate 12 may be the same, or the distance between them may be different. Further, in the present embodiment, although the elastic layer 13 is filled in the space between the tip portion of the boss 11c and the mounting plate 12, a space (gap) may be provided without providing the elastic layer 13 in this space. Further, in the present embodiment, a configuration in which the boss 11c is formed only on the mounting plate 11 is illustrated, but the embodiment is not limited to this. The boss 11c may be provided only on the mounting plate 12, or may be provided on both the mounting plate 11 and the mounting plate 12 as shown in FIG. 12 to be described later.

Further, the mounting plate 12 is formed with a circular inner peripheral opening 12a, and two screw insertion holes 12b are provided along the outer edge portion at appropriate intervals. In this embodiment, although the steel plate is used as the material of the mounting plate 11 and the mounting plate 12, other metal materials, synthetic resin, or the like may be used.

Further, the elastic layer 13 extends continuously in an annular direction along the mounting plate 11 and the inner peripheral openings 11a and 12a of the mounting plate 12. The elastic layer 13 is formed by pouring a rubber-like elastic material into a mold in which the mounting plate 11 and the mounting plate 12 are set so that the mounting plate 11 and the mounting plate 12 face each other. An elastic layer 13 is formed between the 11 and the mounting plate 12. The elastic layer 13 connects the mounting plate 11 and the mounting plate 12.

FIG. 5 is a perspective view of the frame 2 of the main body of the image forming apparatus A with the stepping motor 3 mounted via the vibration isolation mount 1, and FIG. 6 is a cross-sectional view thereof. For convenience of explanation, the frame 2 is transparently displayed in FIG.

As shown in FIGS. 5 and 6, the frame 2 is provided with a circular window portion 2a corresponding to the mounting position of the stepping motor 3. The mounting plate 11 is attached to the frame 2 so that the inner peripheral opening 11a overlaps with the circular window portion 2a of the frame 2 by the screw 15 inserted through the screw insertion hole 11b (see FIG. 4A). Further, the mounting plate 12 is mounted on the stepping motor 3 by the screw 16 inserted through the screw insertion hole 12b (see FIG. 4B).

Further, the rotary shaft 31 of the stepping motor 3 is inserted into the circular window portion 2a of the frame 2 through the mounting plate 11 and the inner peripheral openings 11a and 12a of the mounting plate 12. Further, the pinion gear 32 attached to the tip of the rotating shaft 31 meshes with the driven gear 33. In this way, the stepping motor 3 is attached to the frame 2 via the anti-vibration mount 1.

Next, the operation of the anti-vibration mount 1 when the stepping motor 3 is driven will be described.

First, when the stepping motor 3 is driven, the driving torque thereof is transmitted from the rotary shaft 31 to the driven side via the pinion gear 32 and the driven gear 33. At this time, vibration in the twisting direction (vibration in the circumferential direction) is generated as the stepping motor 3 is driven. Further, in the stepping motor 3, a prying displacement (swing around a point on the axis) occurs due to the reaction force of torque transmission.

For example, when the rotating shaft 31 of the stepping motor 3 rotates in the direction of arrow R2 shown in FIG. 5, the rotating shaft is caused by the reaction force in the direction of arrow F2 shown in FIG. 6 accompanying the torque transmission from the pinion gear 32 to the driven gear 33. A prying displacement in the direction of arrow S2 shown in FIG. 6 occurs in 31. When this prying displacement occurs in the vibration-proof mount 1, the elastic layer 13 is deformed by receiving loads in the compression direction and the tension direction.

Here, when the elastic layer 13 is deformed in the compression direction, the elastic layer 13 is compressed between the mounting plate 12 and the boss 11c formed on the mounting plate 11, and the mounting plate 12 becomes the boss 11c via the elastic layer 13. bump into. As a result, most of the load in the compression direction applied to the elastic layer 13 is transmitted to the boss 11c, which has a significantly higher rigidity than the elastic layer 13. As a result, the deformation of the elastic layer 13 in the compression direction is significantly suppressed. The elastic layer 13 is suppressed from being deformed in the compression direction, so that the deformation in the tensile direction is also suppressed. That is, the boss 11c improves the rigidity of the vibration-proof mount 1 against the prying displacement of the stepping motor 3 and also improves the durability.

Further, regarding the vibration in the twisting direction generated by driving the stepping motor 3, the elastic layer 13 is absorbed by the shear deformation in the twisting direction between the mounting plate 11 and the mounting plate 12, and is absorbed toward the frame 2 side. Vibration transmission is reduced.

As described above, according to the configuration of the present embodiment, vibration isolation performance against torsional vibration generated by driving the stepping motor 3 is ensured and prying is achieved by an inexpensive and simple configuration without adding a new member. The rigidity of the anti-vibration mount 1 with respect to displacement can be increased.

Further, since the outer peripheral surface of the boss 11c is covered with the elastic layer 13, the vibration of the boss 11c is suppressed when the mounting plate 12 hits the boss 11c via the elastic layer 13, and the frame 2 is suppressed via the mounting plate 11. It is possible to suppress the transmission of vibration to the boss. Further, since there is a gap between the boss 11c and the mounting plate 12, the distance between the mounting plate 11 and the mounting plate 12 can be made uniform regardless of the variation in the height of the boss 11c, and further, the mounting plate 11 and the mounting plate 12 can be made uniform. The accuracy of parallelism with 12 can be improved.

As shown in FIG. 7, in the anti-vibration mount 1, the boss 11c may be extended to the mounting plate 12 and brought into contact with the boss 11c. As a result, torsional vibration is easily transmitted from this contact portion to the frame 2, and the vibration isolation performance is slightly deteriorated. However, when the stepping motor 3 is about to undergo a prying displacement, the boss 11c directly applies a load. Because it receives it, the prying displacement itself is greatly suppressed. Therefore, not only the rigidity of the anti-vibration mount 1 against the prying displacement can be improved, but also the inclination of the rotating shaft 31 and the pinion gear 32 of the stepping motor 3 can be significantly suppressed to suppress the inclination of the tooth muscle, and the pinion gear 32 and the pinion gear 32 can be covered. The meshing accuracy with the drive gear 33 can be maintained.

Further, when a helical gear is used as the pinion gear 32, the pinion gear 32 is made of metal, and the driven gear 33 is made of resin, the wear of the driven gear 33 is promoted due to the inclination of the tooth muscle due to vibration, and the durable life is abruptly shortened. There is a concern that it will decline. However, according to the configuration shown in FIG. 7, since the inclination of the tooth muscle due to vibration can be suppressed, the decrease in durable life can be suppressed.

(Second Embodiment)
Next, a second embodiment of the image forming apparatus provided with the vibration-proof mount according to the present invention will be described with reference to the drawings. The same drawings and the same reference numerals are given to the parts where the description overlaps with that of the first embodiment, and the description thereof will be omitted.

FIG. 8 is a perspective view of the anti-vibration mount 50 according to the present embodiment, and FIG. 9 is a cross-sectional view taken along the BB cross section of FIG. FIG. 10 is a perspective view of the mounting plate 51 included in the anti-vibration mount 50.

As shown in FIGS. 8 to 10, the anti-vibration mount 50 has two mounting plates 51 (first mounting plate, second mounting) formed of steel plates to be mounted on the stepping motor 3 and the frame 2 of the image forming apparatus A, respectively. Board) is provided. Further, an elastic layer 53 made of a rubber-like elastic material provided integrally between the two mounting plates 51 is provided. That is, in this embodiment, the two mounting plates 51 included in the anti-vibration mount 50 are made of the same member and have the same shape. The hardness of the rubber-like elastic layer 53 is preferably in the range of Hs40 to 85 (JIS spring type).

A circular inner peripheral opening 51a is formed in the mounting plate 51. A rotating shaft 31 that is rotated by the rotation of the stepping motor 3 is inserted into the opening of the inner peripheral opening 51a. Further, two screw insertion holes 51b are provided along the outer edge portion at appropriate intervals. Further, around the inner peripheral opening 51a, two bosses 51c protruding toward the other mounting plate 51 facing each other are provided at an interval of 180 °, and the bosses 51c are formed by embossing. That is, the boss 51c is formed on both of the two mounting plates 51 included in the vibration-proof mount 50. In this embodiment, although the steel plate is used as the material of the mounting plate 51, another metal material, synthetic resin, or the like may be used.

The two mounting plates 51 are arranged so as to be out of phase by 90 ° in the rotation direction of the stepping motor 3. At this time, the boss 51c is arranged at a distance (distance) of about 0.5 mm between the tip end portion and the other mounting plate 51 facing the boss 51c, and the outer peripheral surface is covered with the elastic layer 53. The distance between the tip of the boss 51c and the other mounting plate 51 facing each other may be the same, or the distance between them may be different. Further, in the present embodiment, although the elastic layer 53 is filled in the space between the tip portion of the boss 51c and the other mounting plate 51 facing each other, the space (gap) is provided without providing the elastic layer 53 in this space. May be.

Further, the elastic layer 53 extends continuously in an annular direction along the inner peripheral opening 51a of the two mounting plates 51 in the circumferential direction. The elastic layer 53 is formed between the two mounting plates 51 by pouring a rubber-like elastic material into a mold in which the two mounting plates 51 are set so that the two mounting plates 51 face each other. An elastic layer 53 is formed on the surface. The elastic layer 53 connects two mounting plates 51.

Next, the operation of the anti-vibration mount 50 when the stepping motor 3 is driven will be described.

When the stepping motor 3 is driven, the driving torque thereof is transmitted from the rotary shaft 31 to the driven side via the pinion gear 32 and the driven gear 33. At this time, as described in the first embodiment, vibration in the twisting direction and twisting displacement occur in the stepping motor 3. When this prying displacement is input to the vibration-proof mount 1, the elastic layer 53 is deformed by receiving loads in the compression direction and the tension direction.

Here, when the elastic layer 53 is deformed in the compression direction, the elastic layer 53 is compressed between the boss 51c formed on the two mounting plates 51 and the other mounting plate 51 facing each other, and the other mounting plate facing each other is compressed. The plate 51 abuts on the boss 51c via the elastic layer 53. As a result, most of the load in the compression direction applied to the elastic layer 53 is transmitted to the boss 51c, which has a significantly higher rigidity than the elastic layer 53. As a result, the deformation of the elastic layer 53 in the compression direction is significantly suppressed. Further, by suppressing the deformation in the compression direction, the deformation in the tensile direction of the elastic layer 53 is also suppressed. That is, the boss 51c improves the rigidity of the vibration-proof mount 50 against the prying displacement of the stepping motor 3 and also improves the durability.

Further, regarding the vibration in the torsion direction generated by driving the stepping motor 3, the elastic layer 53 is absorbed by the shear deformation in the torsion direction between the two mounting plates 51, and the vibration is transmitted to the frame 2 side. Is reduced.

As described above, according to the configuration of the present embodiment, vibration isolation performance against torsional vibration generated by driving the stepping motor 3 is ensured and prying is achieved by an inexpensive and simple configuration without adding a new member. The rigidity of the anti-vibration mount 50 against displacement can be increased.

Further, since the outer peripheral surface of the boss 51c is covered with the elastic layer 53, the vibration of the boss 51c is suppressed when the other mounting plate 51 facing the boss 51c hits the boss 51c via the elastic layer 53, so that the mounting plate 51 can be mounted. It is possible to suppress the vibration from being transmitted to the frame 2 through the frame 2. Further, since the mounting plate 51 is made of the same member, the manufacturing cost can be reduced and the variation in the height of the boss 51c can be reduced.

Further, since there is a gap between the boss 51c and the other mounting plate 51 facing the boss 51c, the distance between the two mounting plates 51 can be made uniform regardless of the variation in the height of the boss 51c, and further two mounting plates can be made uniform. The accuracy of the parallelism of 51 can be improved.

Similar to the first embodiment, the same effect as described above can be obtained by extending the boss 51c to the other mounting plate 51 facing the other mounting plate 51 and bringing the boss 51c into contact with the other mounting plate 51.

(Third Embodiment)
Next, a third embodiment of the image forming apparatus provided with the vibration-proof mount according to the present invention will be described with reference to the drawings. The same drawings and the same reference numerals are given to the parts where the description overlaps with those of the first embodiment and the second embodiment, and the description thereof will be omitted.

FIG. 11 is a perspective view of the anti-vibration mount 60 according to the present embodiment, and FIG. 12 is a cross-sectional view when cut along the CC cross section in FIG. FIG. 13 is a perspective view of the mounting plate 61 included in the anti-vibration mount 60.

As shown in FIGS. 11 to 13, the anti-vibration mount 60 has two mounting plates 61 (first mounting plate, second mounting) formed of steel plates to be mounted on the stepping motor 3 and the frame 2 of the image forming apparatus A, respectively. Board) is provided. Further, an elastic layer 63 made of a rubber-like elastic material provided integrally between the two mounting plates 61 is provided. That is, in the present embodiment, the two mounting plates 61 included in the anti-vibration mount 60 are made of the same member and have the same shape. The hardness of the rubber-like elastic layer 63 is preferably in the range of Hs40 to 85 (JIS spring type).

A circular inner peripheral opening 61a is formed in the mounting plate 61. A rotating shaft 31 that is rotated by the rotation of the stepping motor 3 is inserted into the opening of the inner peripheral opening 61a. Further, two screw insertion holes 61b are provided along the outer edge portion at appropriate intervals. Further, around the inner peripheral opening 61a, four bosses 61c protruding toward the other mounting plate 61 facing each other are provided at intervals of 90 °. The boss 61c is formed by embossing, and the tip portion has a planar shape. That is, the boss 61c is formed on both of the two mounting plates 61 included in the anti-vibration mount 60. In this embodiment, although the steel plate is used as the material of the mounting plate 61, another metal material, synthetic resin, or the like may be used.

The two mounting plates 61 are arranged with the four bosses 61c formed on each facing each other, with the phase changed by 90 ° in the rotation direction of the stepping motor 3. At this time, the bosses 61c facing each other are arranged at a distance (distance) of about 1 mm, and the outer peripheral surface of each boss 61c is covered with the elastic layer 63. The distance between the tip of the boss 61c and the other mounting plate 61 facing each other may be the same, or the distance between them may be different. Further, in the present embodiment, although the elastic layer 63 is filled in the space between the tip portion of the boss 61c and the other mounting plate 61 facing each other, the space (gap) is provided without providing the elastic layer 63 in this space. May be.

Further, the elastic layer 63 extends continuously in an annular direction along the inner peripheral opening 61a of the two mounting plates 61 in the circumferential direction. The elastic layer 63 is formed between the two mounting plates 61 by pouring a rubber-like elastic material into a mold in which the two mounting plates 61 are set so that the two mounting plates 61 face each other. The elastic layer 63 is formed on the surface. The elastic layer 63 connects two mounting plates 61.

Next, the operation of the anti-vibration mount 60 when the stepping motor 3 is driven will be described.

When the stepping motor 3 is driven, the driving torque thereof is transmitted from the rotary shaft 31 to the driven side via the pinion gear 32 and the driven gear 33. At this time, as described in the first embodiment, vibration in the twisting direction and twisting displacement occur in the stepping motor 3. When this prying displacement is input to the vibration-proof mount 60, the elastic layer 63 is deformed by receiving loads in the compression direction and the tension direction.

Here, when the elastic layer 63 is deformed in the compression direction, the elastic layer 63 is compressed between the bosses 61c formed on the two mounting plates 61, and the bosses 61c abut against each other via the elastic layer 63. At this time, since the tip portion of the boss 61c has a planar shape, the bosses 61c abut against each other with high accuracy via the elastic layer 63. As a result, most of the load in the compression direction applied to the elastic layer 63 is transmitted to the boss 61c, which has a significantly higher rigidity than the elastic layer 63. As a result, the deformation of the elastic layer 63 in the compression direction is significantly suppressed. Further, by suppressing the deformation in the compression direction, the deformation in the tensile direction of the elastic layer 63 is also suppressed. That is, the boss 61c improves the rigidity of the vibration-proof mount 60 against the prying displacement of the stepping motor 3 and also improves the durability.

Further, regarding the vibration in the torsion direction generated by driving the stepping motor 3, the elastic layer 63 is absorbed by the shear deformation in the torsion direction between the two mounting plates 61, and the vibration is transmitted to the frame 2 side. Is reduced.

As described above, according to the configuration of the present embodiment, vibration isolation performance against torsional vibration generated by driving the stepping motor 3 is ensured and prying is achieved by an inexpensive and simple configuration without adding a new member. The rigidity of the anti-vibration mount 60 against displacement can be increased.

Further, since there is a gap between the bosses 61c formed on the two mounting plates 61 facing each other, the distance between the two mounting plates 61 can be made uniform regardless of the variation in the height of the bosses 61c. The accuracy of the parallelism of the two mounting plates 61 can be improved.

Further, since the outer peripheral surface of the boss 61c is covered with the elastic layer 63, the vibration of the boss 61c is suppressed when the bosses 61c abut against each other through the elastic layer 63, and the frame 2 vibrates via the mounting plate 61. It can be suppressed from being transmitted. Further, since the mounting plate 61 is made of the same member, the manufacturing cost can be reduced and the variation in the height of the boss 61c can be reduced.

The bosses 61c formed on the two mounting plates 61 from the beginning may be brought into contact with each other (bosses). This makes it possible to obtain the same effect as the configuration described in the first embodiment in which the boss 11c extends to the mounting plate 12 and is brought into contact with the boss 11c. Further, since the bosses 61c are brought into contact with each other, the distance between the two mounting plates 61 can be widened, and the thickness of the elastic layer 63 can be increased to be strong against vibration.

In the first to third embodiments, the number of bosses formed on the mounting plate of the anti-vibration mount is not limited to the above-mentioned one, and can be appropriately changed. However, from the viewpoint of stably supporting the two mounting plates, it is preferable to form three or more bosses (form a plurality of bosses). Further, it is more preferable to provide a boss in the direction in which the load in the compression direction and the load in the tension direction work most on the elastic layer formed between the two mounting plates. Further, the boss may be provided on at least one of the two mounting plates.

Further, in the first to third embodiments, the stepping motor 3 is exemplified as a motor attached to the frame 2 via the anti-vibration mount, but the present invention is not limited to this, and the same effect as described above can be obtained with a DC motor and other motors. Can be obtained.

Further, in the first to third embodiments, the frame 2 of the image forming apparatus A is exemplified as a support for supporting the stepping motor 3, but the present invention is not limited to this, and when the motor is attached to another electronic device or the like, the present invention is not limited to this. , The anti-vibration mount according to the present invention may be used.

1 ... Anti-vibration mount 2 ... Frame (support, device body of image forming device)
3 ... Stepping motor (motor)
11 ... Mounting plate (first mounting plate)
11c ... Boss 12 ... Mounting plate (second mounting plate)
13 ... Elastic layer 51 ... Mounting plate (first mounting plate, second mounting plate)
51c ... Boss 53 ... Elastic layer 61 ... Mounting plate (first mounting plate, second mounting plate)
61c ... Boss 63 ... Elastic layer 78 ... Conveying roller (conveying member)
79 ... Paper feed roller (conveying member)
A ... Image forming device

Claims (13)

Attached to the motor, a first mounting plate that have a first plate portion first opening the rotating shaft of the motor is inserted is formed,
Attached to a support for supporting the motor, and a second mounting plate that have a second plate portion second opening in which the rotary shaft is inserted is formed,
A boss that protrudes from at least one of the first mounting plate and the second mounting plate toward the other mounting plate, and is arranged at a distance from the other mounting plate. With the boss
An elastic layer having elasticity which is formed between the cover and Bo scan, the first mounting plate and said second mounting plate and said first mounting plate to connect the second mounting plate,
Equipped with
The anti-vibration mount is characterized in that the thickness of the elastic layer between the boss and the other mounting plate is thinner than the thickness of the elastic layer between the first plate portion and the second plate portion. .. The boss is provided on the 1 mounting plate, and the boss is provided on the 1 mounting plate.
The vibration isolation according to claim 1, wherein the second mounting plate projects toward the first mounting plate and has another boss arranged so as to face the tip end portion of the boss. mount. The anti-vibration mount according to claim 2 , wherein the boss and the tip of the other boss have a planar shape. Attached to the motor, a first mounting plate that have a first plate portion first opening the rotating shaft of the motor is inserted is formed,
Attached to a support for supporting the motor, and a second mounting plate that have a second plate portion second opening in which the rotary shaft is inserted is formed,
A boss that protrudes from at least one of the first mounting plate and the second mounting plate toward the other mounting plate and abuts on the other mounting plate.
The first mounting plate and the second mounting plate are connected to each other, and have elasticity formed between the first plate portion and the second plate portion so as to surround the boss in the radial direction of the rotating shaft. Elastic layer and
Anti-vibration mount according to claim Rukoto equipped with. The boss is provided on the 1 mounting plate, and the boss is provided on the 1 mounting plate.
Said second mounting plate, said first projecting towards the mounting plate, vibration damping mount according to claim 4, characterized in that it has another boss disposed in contact with the boss. The anti-vibration mount according to claim 2 or 5, wherein the tip portion of the boss has a planar shape. The invention according to any one of claims 1 to 6, wherein the first mounting plate and the second mounting plate have the same shape and are arranged in different phases in the rotation direction of the motor. Anti-vibration mount. The protection according to any one of claims 1 to 7, wherein a plurality of the bosses are formed on at least one of the first mounting plate and the second mounting plate. Shake mount. The anti-vibration mount according to any one of claims 1 to 8, wherein the first mounting plate and the second mounting plate are made of metal, and the boss is formed by embossing. The vibration-proof mount according to any one of claims 1 to 9, wherein the hardness of the elastic layer is Hs40 or more and Hs85 or less (JIS spring type). The anti-vibration mount according to any one of claims 1 to 9, wherein the rigidity of the first mounting plate and the rigidity of the second mounting plate are higher than the rigidity of the elastic layer. The first gear provided at the tip of the rotating shaft and
A second gear that meshes with the first gear and transmits the driving force of the motor.
Have,
The vibration-proof mount according to any one of claims 1 to 11, wherein the 1st gear and the 2nd gear are helical gears. In an image forming apparatus that forms an image on a recording medium,
A motor that drive the conveying member for conveying the recording medium,
The anti-vibration mount according to any one of claims 1 to 12 , which is attached to the motor and the frame of the image forming apparatus that supports the motor.
Equipped with
An image forming apparatus, wherein the first mounting plate is fixed to the motor, and the second mounting plate is fixed to the frame.

Images