JPH08105411A - Fixing mechanism to rotary shaft - Google Patents

Abstract

PURPOSE: To provide an easily removal fixing mechanism by storing a fixing slider in one flange part freely movably forward/backward, holding a spherical body in a slanting groove in the end part of the fixing slider, screwing a screw member pressing the spherical body into the flange part, and forming a locking part for a member to be fixed in the other flange part. CONSTITUTION: A taper engaging part 7a in a member 6 to be fixed is engaged and fixed in a locking part 13 in a flange part, 12a of a rotary shaft 11. When a screw member 21 in a flange part 12b is screwed in from a radius direction outer circumference side, a spherical body 20 is pressed to a slanting groove 17 in a fixing slider 15, and the fixing slider 15 is pressed in the axial line direction of the rotary shaft 11, so that the tip part of the fixing slider 15 is engaged with a taper engaging part 7b in the member 6 to be fixed, and consequently, the member 6 to be fixed is fixed. When the screw member 21 is loosened, a load pressing the fixing slider 15 in the axial direction does not work, and the member 6 to be fixed is released from the rotary shaft 11. Therefore, operation for fixing/releasing of the member 6 to be fixed can be carried out in the radius direction from the radius directional outer circumference side of the rotary shaft 11, and operativity can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for fixing a number ring for printing bar codes and numbers, for example, to a rotary shaft.

[0002]

2. Description of the Related Art Conventionally, bar codes and numbers are sometimes printed in a series of printing steps. In this type of step,
Multiple numbering rings are provided to increase the printing speed. In that case, in order to reduce the space for installing the number ring as much as possible, install multiple number rings on the outer circumference of one shaft and rotate them to continuously supply and print ink. It is configured to do.

FIG. 7 is a schematic view showing an example thereof, in which five number rings 2 are fixed to the outer peripheral portion of the rotary shaft 1,
By passing the printed matter 4 between the rotary shaft 1 and the roller 3 arranged in parallel, the barcode and the numbers are printed. The numbering ring 2 of this kind needs to be removed not only when the print object is changed but also for cleaning or inspection. Therefore, conventionally, the numbering ring 2 is fixed to the rotary shaft 1 as shown in FIG. Was.

FIG. 8 is a sectional view taken along a plane including the central axis of the rotary shaft 1. In this figure, the main body of the number ring is omitted. Flange portions 5a and 5b are formed at both ends of the rotary shaft 1 in the axial direction, and the holder 6 of the number ring is fixed between the flange portions 5a and 5b. Tapered engagement portions 7a and 7b that widen toward the inner peripheral side are formed on both left and right inner peripheral sides of the holder 6, and one flange portion 5a on the left side of FIG. A locking portion 8a is formed that locks the tapered engagement portion 7a by inserting it from the axial direction. On the other hand, the inner surface of the flange portion 5b on the right side of FIG. 8 is an inclined surface that is inclined in the opposite direction to the tapered engagement portion 7b, and the flange portion 5b and the tapered engagement portion 7b are separated from each other. Between the fixed pieces 9 with tapered surfaces on both left and right sides
Is arranged. The fixing piece 9 is fixed to the body of the rotary shaft 1 by a set screw 10 screwed in the radial direction.

[0005]

In the above-described conventional fixing mechanism, when the set screw 10 is tightened, the fixing piece 9 is pushed between the tapered engagement portion 7b and the flange portion 5b. Are pressed in the axial direction and in the radial direction and fixed between the flange portions 5a and 5b. However, when removing the holder 6, the fixing piece 9 only comes out to the outside in the radial direction of the rotating shaft 1. Therefore, in order to remove the holder 6 from the rotating shaft 1, the set screw 10 is completely removed from the rotating shaft 1 and the fixing piece 9 is removed. 9 must be removed from the rotary shaft 1.

Therefore, in the above conventional mechanism, the set screw 1
Since the screwing length is increased to some extent in order to sufficiently secure the fixing strength by 0, it takes a lot of time to pull out the set screw 10, and the work needs to be performed in an extremely limited space. In addition, there is the inconvenience of being forced to work in an unreasonable posture, and there is a possibility that the set screw 10 and the fixed piece 9 that have been removed may fall into the printing machine.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fixing mechanism capable of quickly and easily attaching and detaching a rotary shaft.

[0008]

In order to achieve the above-mentioned object, the present invention makes a plurality of circumferentially divided fixed members adhere to the outer peripheral surface of a rotary shaft and fixes them. A fixing mechanism for the rotary shaft, which fixes the fixed member to the rotary shaft via tapered engagement portions formed on both end sides of the member in the axial direction of the rotary shaft, the width of the fixed member A pair of flange portions set at wider intervals are formed on the rotary shaft, and one flange portion is formed with a concave portion that opens toward the other flange portion and is continuous in the circumferential direction, An arc-shaped fixing piece having a tip end formed in a wedge shape substantially corresponding to one tapered engaging portion of the fixed member and curved along the outer peripheral surface of the rotating shaft is provided in the concave portion in the axial direction. It is housed so that it can move back and forth and is fixed An inclined groove having an arcuate cross section and inclined toward the tip from the inner peripheral side toward the outer peripheral side is formed in the center of the rear end portion in the circumferential direction, and a sphere fitted into the inclined groove is formed. A screw member that is movably held in the radial direction of the flange portion and presses this spherical body toward the center of the rotary shaft is screwed to the one flange portion from the outer peripheral surface side thereof in the radial direction. The other flange portion of the pair of flange portions is further formed with a locking portion that pushes and locks the other tapered engagement portion of the fixed member in the axial direction. It is what

Further, according to the present invention, a groove which is slanted in the opposite direction of the inclined groove and which slides the spherical body can be formed in a portion of the inner wall surface of the recess facing the inclined groove.

[0010]

In the present invention as well, the fixed member is fixed to the rotary shaft through the tapered engagement portions formed at both ends thereof, and one tapered engagement portion is formed on the rotary shaft. It is fixed by being engaged with the locking portion on one of the flange portions. In the present invention, if the screw member provided on the other flange portion is screwed in from the outer peripheral side in the radial direction of the flange portion, the spherical body is pressed by the screw member into the inclined groove of the fixing piece, and as a result, The fixing piece is pressed in the axial direction of the rotary shaft, and the tip end of the fixing piece engages with the tapered engagement portion of the fixed member to fix it. If the screw member is loosened, the load for pressing the fixing piece in the axial direction does not act, and the fixed member is released from the rotary shaft. Further, since the operation of fixing and releasing these fixed members can be performed from the outer peripheral side in the radial direction of the rotary shaft in the radial direction, the operability is improved.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention, and the example shown here is an example in which the present invention is applied to a fixing mechanism of a numbering holder shown in FIG. That is, the holder 6 has the same structure as the conventional one, and the tapered engagement portions 7a and 7b are formed on both sides on the inner peripheral side thereof. Rotating shaft 11 for fixing the holder 6
Is a cylindrical shaft for fixing the five holders 6 in close contact with the outer peripheral surface, and has a pair of flange portions 12a at both ends in the axial direction with a spacing wider than the width of the holder 6,
12b is formed. These flange portions 12a,
One of the tapered engagement portions 7 of the holder 6 is provided at the base end portion (inner peripheral portion) of the flange portion 12a on the left side of FIG.
A locking portion 13 having a tapered inner surface for pushing a in the axial direction for locking is formed.

On the other hand, the other flange portion 12b is
A U-shaped cross section is formed so as to form a concave portion 14 that is open toward the one flange portion 12a and that is continuous in the circumferential direction, and the fixing piece 15 is provided inside the fixing piece 15 in the axial direction of the rotating shaft 11 (see FIG. 1). It is arranged to move back and forth in the left-right direction. The fixing piece 15 has an arc shape in which the length in the circumferential direction is set to be substantially equal to the length in the circumferential direction of each holder 6, and therefore the holder 6 is provided inside the recess 14. The same number of five fixed pieces 15 are arranged.

This fixed piece 15 is the one flange portion 1 described above.
2a is for fixing the holder 6 to the rotary shaft 11 in cooperation with the locking portion 13 in 2a.
As shown in enlarged form, a wedge-shaped locking portion 16 is formed corresponding to the tapered engagement portion 7b.

A means for moving the fixed piece 15 back and forth, that is, a means for clamping and unclamping the holder 6 with respect to the rotary shaft 11 will be described below. In the example shown in FIG. 1, the operation for clamping and unclamping the holder 6 is configured to be performed from the outer peripheral side in the radial direction of the rotating shaft 11, and therefore, first,
A central portion in the longitudinal direction of the rear end portion of the fixed piece 15 (an end portion on the side opposite to the locking portion 16) (with the fixed piece 15 being curved in an arc shape corresponding to the rotating shaft 11). An inclined groove 17 is formed in a substantially central portion in the circumferential direction). As shown in FIGS. 3 to 5, the inclined groove 17 has an arcuate cross section, and a portion on the outer peripheral side in the radial direction (a portion on the upper surface in the figure) forms the locking portion 16. It is inclined so that it is closer to the tip part.

On the other hand, in the portion of the inner wall surface of the recess 14 facing the inclined groove 17 (the back wall portion of the recess 14), the inclined groove 18 having a circular cross section and inclined in the direction opposite to the inclined groove 17 is formed.
Are formed. The inclination angles θ1 and θ2 of these inclined grooves 17 and 18 may be equal, but in the example shown in the figure, the inclination angle θ1 of the inclined groove 17 in the fixed piece 15 is larger than the inclination angle θ2 of the inclined groove 18. It is set to an angle.

Further, in the portion of the flange portion 12b corresponding to the inclined grooves 17 and 18, the inclined grooves 17 and 1 are formed.
A screw hole 19 having a radius equal to or less than the radius of curvature of 8 is formed so as to be open in the radial direction of the rotating shaft 11 and on the outer peripheral surface. A spherical body, for example, a steel ball 20 that fits into the inclined grooves 17 and 18 is inserted from the screw hole 19, and a bolt 21 with a hole is screwed into the screw hole 19 from the outer peripheral side. Therefore, the steel ball 20 is pressed by the bolt 21 with the hole toward the center of the rotary shaft 11, and as a result, is pressed against the inclined grooves 17 and 18.

Further, in the embodiment shown in the drawing, means for pulling back the fixed piece 15 in the unclamping direction is provided. Figure 6
FIG. 4 is a partial cross-sectional view showing an example thereof, in which a through hole 22 extending from the outer side surface of the flange portion 12b in the axial direction to the inside of the recess 14 is formed. This through hole 22 is
As shown in FIG. 6, a portion of the flange portion 12b that opens to the outer surface has a large diameter, and thus a receiving seat 22a for the spring 23 is formed at a portion where the inner diameter changes. On the other hand, on the rear end surface of the fixing piece 15, the screw hole 2
4 are formed. The flange portion 12 is inserted into the screw hole 24 with the fixing piece 15 inserted in the recess 14.
The bolt 25 inserted into the through hole 22 from the outer surface side of b
Is screwed in, and a spring 23 is arranged between the head of the bolt 25 and the receiving seat 22a.
Therefore, the spring 23 elastically presses the head of the bolt 25 to the right in FIG. 6 to pull back the fixing piece 15 connected to the bolt 25 in the unclamping direction, that is, to the right in FIG. Has been done.

The inclination angle θ of the inclined grooves 17 and 18
1, θ2 and the diameter of the steel ball 20, or the length or thickness of the fixing piece 15 in the axial direction, the steel piece 20 is fixed when the fixing piece 15 moves to the holder 6 side and is clamped. The size and angle are set so as to contact the fixed piece 15 above the central portion of the piece 15 in the thickness direction. A groove 26, which is recessed inward in the radial direction, is formed in a portion of the body of the rotary shaft 11 on the side of the flange portion 12b, more specifically, a portion corresponding to a portion where the fixing piece 15 projects. There is. That is, when the fixed piece 15 is advanced to the left in FIG. 1 via the steel ball 20, the tip of the fixed piece 15 can be slightly displaced toward the center of the rotary shaft 11.

Further, in the example shown in the drawing, since the five holders 6 are fixed to the outer peripheral side of the rotary shaft 11, the outer peripheral side of the barrel of the rotary shaft 11 is divided into five equal parts.
A slit 27 is formed, and a pin 28 that fits into the slit 27 is provided on the bottom surface of the central portion of the holder 6 so as to project the holder 6 in the circumferential direction. Is configured to.

Next, the operation of the above-mentioned fixing mechanism will be described. FIG. 1 shows a state in which the holder 6 is fixed to the rotating shaft 11, and the holder 6 has a pin 28 protruding from the bottom surface thereof fitted into a slit 27 formed on the outer peripheral surface of the rotating shaft 11, Positioning is done in the circumferential direction,
Moreover, one of the engaging portions 7a is engaged with the locking portion 13 of the one flange portion 12a, and the other end of the engaging portion 7b is engaged with the tip portion of the fixing piece 15. That is, the fixed piece 15 has the concave portion 1 in the other flange portion 12b.
The steel ball 20 is pressed into the inclined groove 17 on the rear end side from the outer peripheral side in the radial direction by the bolts 21 with holes. That is, the steel ball 20 is
It is fitted in each of the inclined grooves 17 and 18, and the pressing force in the radial direction by the bolt 21 with holes acts in the axial direction by the inclined grooves 17 and 18, and as a result, the fixing piece 15 is held by the holder 6. Pressed to the side. In that case, the acting force in the axial direction with respect to the pressing force directed in the radial direction is determined by the inclination angles θ 1 and θ 2 of the inclined grooves 17 and 18, and the fixed piece with respect to the moving amount of the steel ball 20 in the radial direction of the rotating shaft. The stroke of 15 is these inclined grooves 1
Depending on the inclination angles θ1 and θ2 of 7 and 18,
In the example shown in FIG.
Since the steel ball 20 is formed downward by pushing the steel ball 20 downward in FIG.
1, the stroke amount in the axial direction of the fixed piece 15 can be increased with respect to the movement amount in the radial direction of the rotating shaft 11 of the steel ball 20.

The holder 6 has one engaging portion 7a and the fixed piece 1
In a state where it is sandwiched between the fixed ball 15 and the fixed piece 15 and is almost completely fixed, the steel ball 20 is in contact with the fixed piece 15 slightly above the center of the fixed piece 15 in the thickness direction. 15
As shown in an enlarged view in FIG. 2, the locking portion 16 formed at the tip of the holder has a taper angle slightly different from the taper angle in the engaging portion 7b of the holder 6, so that the locking portion 16 on the upper end side is It is in contact with the engaging portion 7b, and therefore the fixing piece 1
A downward moment acts on the engaging portion 7b of the holder 6 due to the pressing force of the holder 5 in the axial direction, and as a result, the holder 6 is more positively brought into close contact with the outer peripheral surface of the rotary shaft 11 to be fixed. Can be made. Further, such an action is compensated by forming the groove 26 on the outer peripheral surface of the barrel of the rotating shaft 11. Further, even when the holder 6 is completely clamped, the steel ball 20 does not come into contact with the inner peripheral surface of the concave portion 14, so that the flange portion 12b.
The elastic deformation force at the position acts to press the steel ball 20 against the fixed piece 15, and as a result, it is possible to prevent the fixed piece 15 from loosening the fixing force of the holder 6. In the configuration shown in FIG. 1 described above, since the fixing piece 15 that is curved in an arc shape as a whole is configured to be pressed by the steel ball 20 in the axial direction of the rotating shaft 11, the pressing piece 15 is pressed against the fixing piece 15. Since the acting position of the pressure is a point or a line at the substantially central portion in the arc direction, the fixed piece 15 can be pressed without causing the inclination (or the rattling) of the fixed piece 15, and as a result, The fixing piece 15 can be surely brought into contact with the engaging portion 7b, and the fixing force of the holder 6 can be sufficiently secured.

When the holder 6 is to be removed, the holed bolt 21 is rotated in the direction of withdrawing it from the screw hole 19. By doing so, the load for pressing the steel ball 20 toward the center of the rotary shaft 11 is eliminated, so that the action of pressing the fixed piece 15 toward the holder 6 side is lost, and the clamp of the holder 6 is released. In that case, the fixed piece 15 is connected to the spring 23 via the bolt 25 screwed into the rear end surface.
6, the fixing piece 15 is pulled back in the direction away from the engaging portion 7b of the holder 6. Therefore, as the holed bolt 21 is gradually pulled out from the screw hole 19, the fixing piece 15 is retracted, and the holder 6 is slightly moved to the right in FIG. The holder 6 can be removed from the rotating shaft 11 by removing the holder 6 from the locking portion 13 of the flange portion 12a.

Therefore, according to the fixing mechanism described above, the fixing piece 15 is moved in the axial direction of the rotary shaft 11 by screwing in or loosening the bolts 21 with holes which are attached in the radial direction of the rotary shaft 11. Then, the holder 6 is clamped or unclamped. Therefore, the holder 6 or the number ring (not shown) held by the holder 6 can be attached to and detached from the rotary shaft 11 by an operation from the outer peripheral side in the radial direction of the rotary shaft 11, and the operation thereof. In the above-described embodiment, this can be done by the hexagonal bar wrench 29 fitted to the bolt 21 with holes, in which case the hexagonal bar wrench 29 interferes with the shaft (not shown) to which the rotary shaft 11 is attached. Therefore, the hexagonal wrench 29 and the bolt 21 with a hole can be quickly and easily rotated. In other words, with the configuration of the above-described embodiment, the operability of attaching / detaching the holder 6 or the number ring held by the holder 6 becomes extremely good.

Further, in the above-described embodiment, the steel ball 20 is fitted over both the inclined groove 18 in the flange portion 12b and the inclined groove 17 in the fixed piece 15, so that the fixed piece 15 extends in the circumferential direction. The movement can be regulated by the steel ball 20, and therefore the steel ball 20 acts not only as a pressing means for the fixing piece 15 but also as a position regulating means in the circumferential direction, which simplifies the structure and facilitates handling. Becomes

Although the steel balls 20 are used as the spheres in the above embodiment, the spheres in the present invention are not limited to the steel balls. Further, although the holed bolt is shown as the means for pressing the spherical body in the above-described embodiment, the means for pressing the steel ball 20 in the radial direction of the rotating shaft in the present invention is a screw means other than the holed bolt 21. Good.
Further, in the above embodiment, the case where the holder for the numbering ring is fixed has been described as an example, but the present invention is not limited to the above embodiment, and the fixed member other than the above holder is fixed. Can be applied to the case where is fixed to the outer peripheral surface of the rotating shaft. Further, the rotation axis does not necessarily have to be cylindrical, and may have a polygonal cross section.

[0026]

As described above, according to the fixing mechanism of the present invention, the pressing force directed in the radial direction of the rotating shaft is applied to the fixing piece to move the fixing piece in the axial direction, thereby fixing the object to be fixed. Since the member is configured to be fixed between the pair of flange portions, the operation for clamping or unclamping the fixed member can be performed from the outer peripheral side in the radial direction of the rotating shaft in the radial direction. Therefore, there is no interference with the rotating shaft during clamping and unclamping, which improves operability. Further, since the inclined groove having an arcuate cross section and the spherical body fitted into this inclined groove are adopted as the means for pressing the fixed piece, even if the fixed piece is curved along the outer peripheral surface of the rotating shaft, The fixed piece can be moved in parallel in the axial direction without causing the fixed piece to incline or snag. Therefore, the fixed member can be reliably clamped.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing an enlarged shape of a tip portion of a fixed piece.

FIG. 3 is a partial perspective view showing an example of a fixing piece.

FIG. 4 is a rear view of a fixed piece.

FIG. 5 is an explanatory diagram showing a shape of an inclined groove.

FIG. 6 is a cross-sectional view showing an example of a mechanism for returning and moving a fixed piece.

FIG. 7 is a side view schematically showing how a number ring is attached to a rotating shaft.

FIG. 8 is a schematic partial cross-sectional view showing a conventional holder fixing mechanism.

[Explanation of symbols]

 6 Holders 7a, 7b Tapered engagement parts 11 Rotating shafts 12a, 12b Flange parts 13 Locking parts 14 Recesses 15 Fixing pieces 17, 18 Inclined grooves 20 Steel balls 21 Hole bolts

Claims (2)

[Claims] 1. A plurality of fixed members, which are divided in the circumferential direction, are brought into close contact with the outer peripheral surface of the rotary shaft, and the fixed members are formed on both end sides in the axial direction of the rotary shaft. In a fixing mechanism for a rotating shaft that fixes a fixed member to the rotating shaft via a taper-shaped engaging portion, a pair of flange portions set at an interval wider than the width of the fixed member is formed on the rotating shaft. In addition, one flange portion is formed with a recessed portion that is open toward the other flange portion and that is continuous in the circumferential direction, and the shape of the tip end substantially corresponds to one tapered engagement portion of the fixed member. An arcuate fixed piece having a wedge shape and curved along the outer peripheral surface of the rotary shaft is housed in the recess so as to be movable back and forth in the axial direction, and the rear end of the fixed piece has a center in the circumferential direction. Has a circular cross section and An inclined groove is formed which is inclined from the peripheral portion side toward the outer peripheral portion toward the tip end portion, and a sphere fitted into the inclined groove is movably held in the radial direction of the flange portion, and the sphere is A screw member that presses toward the center of the rotating shaft is screwed into the one flange portion from the outer peripheral surface side thereof in the radial direction,
Further, a locking portion is formed on the other flange portion of the pair of flange portions so as to push and lock the other tapered engagement portion of the fixed member in the axial direction. Fixing mechanism. 2. A groove, which is slanted in a direction opposite to the inclined groove and slides the spherical body, is formed in a portion of the inner wall surface of the recess facing the inclined groove. The fixing mechanism for the rotating shaft according to 1.