JP6326014B2 - Belt rack type drive unit - Google Patents

Description

  The present invention relates to a belt / rack type driving device that moves by meshing the tooth edge of an endless belt with a rack base mounted and fixed to a pedestal, and in particular, a belt capable of long-stroke driving and high-precision feeding and positioning. -It is related with a rack type drive device.

In an operation mechanism that combines an endless belt and a rack, there is a linear drive device that converts an endless traveling member spanned between a driving pulley and a driven pulley to a fixed uneven member of a guide rail to convert rotational motion into linear motion. Yes (for example, see Patent Documents 1 and 2).
This linear drive unit enables high-precision positioning regardless of the length of the stroke, and realizes a structure of a linear drive unit with low noise, low vibration, low transmission resistance, no rattling, and high rigidity. ing.

This type of linear drive device has been improved so that it can be effectively used at production sites by incorporating an endless travel member into a machine tool, precision device, robot travel, stocker transport, cleaning line transport, and the like.
Applicable objects of the linear drive device include not only feed and positioning devices for production machines but also article transport and travel devices in various fields. It is also effective as a long-distance transfer device such as a distribution line for a distribution warehouse.

In recent years, large-scale production factories have run a long distance by bundling a large number of ultra-thin glass plates used for liquid crystal display units and the like. In this case, the durability of the linear drive device is greatly improved, and it is necessary to ensure a quicker and less noise traveling by smoothly engaging the endless traveling member with the rack.
Patent Document 3 discloses a method for locking a seismic lock bolt, and has a structure in which a nut is tightened by screwing a tightening screw into a perforated portion formed in a shaft portion of the bolt.

JP 7-208570 A JP-A-6-106487 JP, 2014-013071, A

In Patent Document 1, a fixed concavo-convex member is used in combination with a pulley and an endless traveling member, and can be applied to both a short distance and a long distance, and while being lightweight, it achieves quietness, high speed, oil-free and non-backlash, Simple maintenance can be done.
In Patent Document 2, a straight traveling mechanism is devised in which a main pinion and a sub-pinion are pressed toward each other to remove backlash between them.
However, these linear drive devices leave room for improvement from the viewpoint of manufacturing at a low cost and constructing a robust and durable structure with a simple structure. There is room for improvement in that the rack can not be securely engaged and various adjustments cannot be made and handling is not easy.

In addition, the rack base with rack teeth is long, and in order to attach and fix the long rack base to the machine base as a base, it is screwed to the machine base through the rack base insertion hole. doing. For this reason, it is necessary to thread the machine base, and there is a disadvantage in that productivity is lowered due to an increase in the assembly process for attaching the rack base to the base.
In the lock-type bolt disclosed in Patent Document 3, since the screw is screwed into the perforated portion of the bolt shaft portion, when the lock-type bolt is applied to the screw tightening described above, due to vibrations associated with long-term use, etc. On the other hand, there is a risk that the tightening screw will loosen.

  The present invention has been made in view of the above circumstances, and its object is to use a combination of a pulley and an endless belt on a rack base, and it can be applied to both short distances and long distances, and has a simple structure that is robust and durable. Provides a belt / rack type drive unit that improves productivity and improves productivity by reducing the assembly process for attaching the rack base to the pedestal, and allowing the rack base to be securely attached to the pedestal with simple operations. There is to do.

(About claim 1)
In the belt-rack type drive device, the rack base is mounted on a rack base mounted on a pedestal with a large number of rack teeth arranged in parallel at a predetermined pitch interval. The support plate is provided on the rack base and is slidably attached in the longitudinal direction of the rack base. The first pulley and the second pulley are rotatably attached to the support plate at a predetermined interval.
For example, an endless belt formed of a synthetic resin such as rubber is stretched from the first pulley to the second pulley.
On the outer side of the endless belt, a large number of tooth sides meshing with the rack teeth of the rack base are juxtaposed along the circumferential direction. The pulley drive unit rotationally drives the first pulley and the second pulley to circulate and move the endless belt along the circumferential direction, and meshes the tooth side portions with the rack teeth in order, thereby using the support plate as a moving body. Move along. The tension pulley is rotatably attached to the support plate via a rotating shaft and applies tension to the endless belt.
The mounting and fixing structure for attaching the rack base to the pedestal includes an insertion hole, an inner tapered surface, a piece portion, a long groove, and a tightening bolt formed in the rack base in a penetrating state in the height direction.
A hollow portion is provided at the lower end portion of the rack base, and a space portion is formed at the lower end portion of the hollow portion. The inner tapered surface is formed so that the inner peripheral surface of the space portion becomes narrower toward the rack teeth . A piece part is formed corresponding to the shape of a space part, and has a female screw part which penetrates along the direction of an axis in the central part. The outer tapered surface formed in the piece portion is set so that the outer peripheral portion comes into contact with the inner tapered surface. The long groove is formed along the longitudinal direction on the surface of the pedestal, and fits the rack base. The tightening bolt is screwed into the female screw portion of the piece portion through the insertion hole by screwing. At this time, the outer tapered surface slide pressed against the inner tapered surface of the space portion, thereby the rack stand of the outer wall surface is pressure contact with the inner wall surface of the long groove by deformation outwardly.
The rack teeth each have a tooth trace surface portion that forms an angle within the range of 85 to 90 degrees with respect to the rack base and a tooth bottom surface portion that is recessed in the bottom bottom direction. The tooth edge portion of the endless belt forms a tooth trace plane portion that engages and meshes with the tooth trace surface portion, and a tooth tip projection surface portion that engages and meshes with the tooth bottom surface portion.

In claim 1, the rack base is used in combination with a pulley and an endless belt, and can be applied to both a short distance and a long distance.
Since the tooth edge portion of the endless belt is meshed with the rack teeth, the number of meshing teeth at the same time increases, and the transmission force from the endless belt to the rack base can be improved.
In addition, the simple structure that meshes the endless belt with the rack base makes it possible to realize light weight, quietness, high speed, oil-free and non-backlash, as well as the advantages of easy maintenance and low cost production, as well as robustness and durability. Can be improved.

  The rack base mounting and fixing structure can be realized by a simple operation of screwing the tightening bolt into the female screw portion of the frame portion from the insertion hole. In other words, the mounting and fixing structure requires only a member consisting of an insertion hole of the rack base, an inner tapered surface, a piece, a long groove and a tightening bolt, so that the assembly process for mounting the rack base to the base is reduced, and the rack base can be easily mounted on the base. Can be securely attached and fixed by simple operation, and as a result, productivity can be improved.

Since the rack tooth has a tooth trace surface portion that forms an angle within a range of 85 to 90 degrees with respect to the rack base, the tooth trace surface portion has an angle close to a right angle with respect to the traveling direction W of the endless belt (85 to 90 degrees). Within the angle range).
As a result, the pressure angle of the tooth trace plane portion with respect to the tooth trace surface portion of the rack tooth is remarkably reduced. The tooth edges of the tooth no longer lift from the rack teeth. For this reason, a separate pressing member for holding the endless belt on the rack side is not required.
Further, since the tooth tip projecting surface portion engages with the bottom surface portion of the rack tooth as an introduction portion, the tooth edge portion can be smoothly meshed with the rack tooth when the endless belt is meshed.

(About claim 2)
The second aspect differs from the first aspect in that the tooth edge portion of the endless belt forms a tooth trace plane portion and a tooth tip projection surface portion as a tooth profile, and the rack tooth has an inclination angle of the tooth trace plane portion with respect to the rack base. And having a tooth muscle surface portion with a different inclination angle. Thereby, at the time of meshing of the tooth edge portion with the rack tooth, the tooth tip protruding surface portion engages and meshes with the tooth bottom surface portion, but a tooth trace space is formed between the tooth trace plane portion and the tooth trace surface portion.
In this state, when a driving force in the pulling direction is applied to the endless belt, the tooth trace plane portion of the endless belt is pulled to the pulling side with the corner portion on the pulling side serving as a fulcrum at the bottom surface of the rack tooth. The tensile force acts as a rotational force around the fulcrum on the tooth side, and the endless belt is attached to the rack teeth. For this reason, even if a pressing member for the endless belt is not provided, the endless belt is not lifted from the rack teeth, and efficient power transmission can be performed between the endless belt and the rack teeth.

(Claim 3)
The third aspect differs from the first aspect in that flange bands are provided at both end portions of the endless belt. The flange band is formed along the entire circumference of the endless belt and arranged so as to sandwich the rack base. With this flange band, the endless belt can be held at a regular position, and the endless belt is not accidentally detached from the rack base during traveling.

(About claim 4)
The difference between claim 4 and claim 3 is that the flange bands existing at both end portions of the endless belt are omitted.

(Claim 5)
At the lower end portion of the outer wall surface of the rack base, an outer fitting tapered surface is provided that spreads downward in a skirt shape and inclines downward. On the inner wall surface of the long groove, an inner groove taper surface that gradually becomes narrower as it goes upward is formed.
When the rack base is attached to the pedestal, the rack base is fitted to the long groove by sliding from the side, and the outer fitting taper surface is in close contact with the inner groove taper surface in contact with the inner groove taper surface.

  Also in claim 5, as in claim 1, the assembly process for attaching the rack base to the pedestal is reduced, and the rack base can be securely attached and fixed to the pedestal by simple operation, thereby improving productivity. be able to.

(About claim 6)
A vertical slit communicating with the space is formed on the outer wall surface of the rack base. In this case, there is an advantage that the outer wall surface of the rack base is easily deformed outward when the fastening bolt is screwed into the female screw portion of the piece portion.

(About claim 7)
A strain gauge is attached to the inner peripheral surface of the upper end of the cavity of the rack base. A notification unit is connected to the strain gauge via a deformation amount detection sensor, a central processing unit, and an activation unit.
When the tightening bolt falls below or exceeds the appropriate tightening torque range due to long-term use, an output based on the strain gauge deformation amount (distortion amount) is detected by the deformation amount detection sensor. A deformation amount (distortion amount) by the output is calculated by the central processing unit, and a calculation signal is output to the starting unit to operate the notification unit.

  In claim 7, although the tightening bolt is screwed into the female screw portion with a predetermined torque, if it falls below or exceeds the proper tightening torque range due to long-term use, etc. It is configured to notify the users concerned. That is, by operating the notification unit, the lamp can be blinked or a buzzer can be sounded to notify the user concerned.

(About claim 8)
The outer taper surface is formed with an outer groove along the vertical inclination direction, and the inner taper surface is formed with an inner groove facing the outer groove. A sliding ball is slidably arranged in a state inscribed in the outer groove and the inner groove.

  According to the eighth aspect of the present invention, when the tightening bolt is screwed into the female screw portion, the outer tapered surface of the piece portion moves along the inner tapered surface via the sliding ball, so that the piece portion is slid in the axial direction along the inner tapered surface. As a result, the rack base can be quickly attached to the base. In addition, since the sliding ball is arranged over the outer groove and the inner groove, the piece portion does not rotate with the tightening bolt when the tightening bolt is screwed into the female screw portion.

(About claim 9)
The presser member is disposed so as to be slidable inside the meshing region of the endless belt where the tooth side meshes with the rack teeth. The holding member prevents the endless belt from jumping from the rack teeth when the endless belt moves.

(About claim 10)
The presser adjusting member adjusts the sliding contact degree of the presser member with respect to the meshing region by changing the position of the presser member with respect to the meshing region.

(About claim 11)
The pressing member is disposed so as to be slidable inside the meshing region where the tooth side portion of the endless belt meshes with the rack teeth, and prevents the endless belt from jumping from the rack teeth when the endless belt moves. When the first pulley and the second pulley are rotated, on the side of the endless belt where the tooth side portion begins to mesh with the rack teeth, the tip of the pressing member does not interfere with the first pulley or the second pulley. It extends to the proximity range and presses the tooth edges against the rack teeth to forcibly mesh.

  In the case of Claim 11, the front-end | tip part of the pressing member is extended to the position where a tooth edge part begins to mesh | engage with a rack tooth | gear of an endless belt at the time of the rotational drive of a 1st pulley. Thereby, the front-end | tip part of a pressing member can press down a tooth | gear side part quickly, and it can mesh | engage with a rack tooth, Especially the smooth movement of an endless belt with respect to a rack tooth can be ensured at the time of a drive start.

(About claim 12)
On both sides of the holding member along the longitudinal direction of the rack base, there are integrally formed hanging sides that surround the endless belt and are suspended from both sides of the rack base so as not to remove the endless belt from the rack base. .

  In the case of the twelfth aspect, since the endless belt is regulated not to be detached from the rack base by the drooping side portion, it is not necessary to provide an annular flange for preventing the outer periphery of the first pulley and the second pulley. For this reason, the first pulley and the second pulley are inexpensive, which can contribute to the cost reduction of the belt / rack type driving device.

(About claim 13)
A slider guide provided on the rack base is slidably attached in the longitudinal direction, and a support plate is fixed to the slider.
The contact adjusting member includes an upper and lower elongated hole formed in the support plate and an upper and lower screw inserted through the upper and lower elongated hole. By changing the vertical position of the support plate with respect to the upper and lower elongated holes and retightening the upper and lower screws from the upper and lower elongated holes to the slider, the degree of contact between the first pulley and the second pulley with respect to the rack teeth can be adjusted.
In the case of the thirteenth aspect, the abutting adjustment member may have a simple structure including upper and lower elongated holes and upper and lower screws, which saves space and is advantageous in terms of manufacturing cost.

(About claim 14)
Since the rack base is formed by joining a plurality of single rack bases, even if a gap of about one or two teeth is set between adjacent single rack bases, it will hinder traveling. Absent. Thereby, there is an advantage that a large distance can be set with a small number of additions of a single rack base.

(Example 1) which is a front view which shows a belt rack type drive device. (Example 1) which is a top view which shows a belt rack type drive device. (A) is a perspective view which shows a tension adjustment member (Example 1), (b) is a perspective view which shows a tension adjustment member (modified example of Example 1). (Example 1) which is a longitudinal cross-sectional view which follows the AA line of FIG. (Example 1) which is a longitudinal cross-sectional view which follows the BB line of FIG. (A), (b) is a longitudinal cross-sectional view which shows mesh | engagement with a rack tooth and a tooth | gear part, (c), (d) is a longitudinal cross-sectional view which shows the endless belt to which the pressing member is applied (Example 1). . (A), (b) is the schematic which shows the aspect of the attachment or detachment of the endless belt with respect to a 1st pulley and a 2nd pulley (Example 1). (A)-(c) is the schematic which shows the case where a several rack stand is added (Example 1). (A)-(c) is the schematic which shows the manufacturing direction of a rack tooth (Example 1). (A) is an exploded perspective view of a pedestal and a rack base, (b) is a longitudinal sectional view of the rack base, a piece portion, and a fastening bolt, and (c) is an exploded perspective view of the piece portion and the fastening bolt (Example 1). (D) is an exploded perspective view of a base and a rack base (modification). (A) is an exploded perspective view of a pedestal and a rack base, (b) is a perspective view showing a long bar member (Example 2), and (c) is a perspective view of the rack base (Example 3). (Example 4) which is a longitudinal cross-sectional view of a rack stand, a piece part, and a fastening bolt shown with a deformation amount detection part. (A) is a longitudinal cross-sectional view of a rack base, a piece, and a fastening bolt, (b) is a cross-sectional view taken along the line CC of (a), and (c) is a cross-sectional view enlarging a part of (b). (Example 5) which is a figure. (Example 6) which is a longitudinal cross-sectional view which shows a belt rack type drive device. (A) is a schematic diagram showing a frictional sliding contact surface applied to a rack tooth, (b) is a schematic diagram showing an experimental tool for a tensile test, and (c) is a schematic diagram showing engagement between the rack tooth and the tooth side part ( (Example 7), (d) is a schematic view showing the streaks applied to the rack teeth (Example 8). (A) is the schematic which shows the curved surface part given to the rack tooth, (b), (c) is the schematic which shows mesh | engagement with a rack tooth and a tooth | gear part (Example 9). (A), (b) is the schematic which shows the structure which penetrated the rack base to the solid holder so that a movement was possible (Example 10). (Example 11) which is the schematic which shows the aspect which applied the rack stand to the structure with a large diameter. These are the schematics which show the aspect which applied the rack base to a large-diameter structure like the magnet stand of an MRI apparatus (Example 12). (Example 12) which is a front view which shows the aspect which installed the rotating roller in the meshing area | region of the endless belt instead of the pressing member. (Example 13) which is a front view which shows the aspect which urges | biases a tension pulley with a spring member. (A), (b) is a longitudinal cross-sectional view which shows the meshing state of an endless belt and a rack tooth (Example 14 and its modification). (A) is a longitudinal sectional view showing a tooth profile of a rack tooth, (b) is a longitudinal sectional view showing a meshed state of the endless belt and the rack tooth, and (c) shows an operation of the tooth trace plane portion in the tooth side portion. (Example 15) which is a longitudinal cross-sectional view. (A) is a perspective view which shows an endless belt, (b) is a cross-sectional view which follows the EE line | wire of (a) (Example 16). (A) is a longitudinal cross-sectional view which shows an endless belt, (b) is a longitudinal cross-sectional view which shows the meshing state of an endless belt and a rack tooth (Example 17). (Example 18) which is a longitudinal cross-sectional view which shows the state which mesh | engaged the endless belt and the rack tooth.

  The belt rack type driving device according to the present invention uses a combination of a pulley and an endless belt on a rack base, and can be applied to both a short distance and a long distance, has a simple structure and is robust and excellent in durability. The assembly process for attaching the rack base to the pedestal is reduced, and the rack base is securely attached to the base by a simple operation.

[Configuration of Example 1]
A first embodiment of the present invention will be described with reference to FIGS. In the following description, unless otherwise specified, the position and direction of each member are specified in the left and right and up and down directions of the corresponding drawings throughout each embodiment.

  In the belt / rack type driving apparatus 1 according to the present invention, as shown in FIGS. 1 and 2, the moving bodies 3 and 4 are arranged on the left and right on the rack base 2 installed on the installation surface G. The rack base 2 is formed of a metal such as aluminum, for example, and a large number of rack teeth 2a are arranged in parallel at a predetermined pitch interval P on the upper surface. The rack tooth 2a meshes with a tooth side part 16a of an endless belt 16, which will be described later, and the tooth tip part is chamfered.

The moving body 4 on the right side is configured as a five-wheeled body, and the slider base 5 is provided with a slider guide 5 along the longitudinal direction T. The slider 6 has a slider 6 along the longitudinal direction T. It is slidably attached.
A support plate 7 formed in a rectangular shape, for example, is fixed to the slider 6 in a vertical shape by screws 8 and 9. Accordingly, the support plate 7 is attached to the slider guide 5 via the slider 6.

A first pulley 10 and a second pulley 11 are attached to the support plate 7 so as to be rotatable by support shafts 10a and 11a, respectively, in a state where the first pulley 10 and the second pulley 11 are spaced apart from each other by a predetermined distance E. An auxiliary pulley 12 and a tension pulley 13 are rotatably attached to the left and right upper sides of the support plate 7.
The rotary shaft 13a of the tension pulley 13 has a male screw portion 13b formed at the tip of the rotary shaft 13a, and a long hole 7a extending through the support plate 7 in the pulling direction of the endless belt 16, which will be described later. The tension adjusting member 14 consisting of

  In the tension adjusting member 14, the tension is applied to the endless belt 16 by changing the position of the rotary shaft 13a with respect to the elongated hole 7a and retightening the fastening nut 15 to the male screw portion 13b (see FIG. 3A).

That is, the tension adjusting member 14 is provided with a male screw portion 13b formed at the tip of the rotating shaft 13a. The long hole 7 a is formed in the support plate 7, and the male screw portion 13 b is protruded to the outside of the support plate 7 through the rotation shaft 13 a.
The compression coil spring 13m as an urging member urges the endless belt 16 by urging the rotating shaft 13a in a direction in which the rotating shaft 13a is moved in the direction V perpendicular to the rotating shaft 13a along the longitudinal direction N of the long hole 7a. The longitudinal direction N of the long hole 7 a is set in a direction along the tension direction of the endless belt 16.

  The tightening nut 13n is screwed into the male screw portion 13b so as to be able to advance and retreat, and a pinion portion 13t is formed on the outer peripheral side surface. The worm gear 13s is disposed between the fixed plate portions 13r and 13v of the support plate 7 so as to be rotatable in a state orthogonal to the rotation shaft 13a and meshes with the pinion portion 13t.

The tooth trace of the pinion portion 13t meshes with the tooth trace during rotation of the worm gear 13s so as to be capable of fine sliding reciprocation along the axial direction Jm of the rotary shaft 13a. This fine sliding displacement amount only needs to correspond to at least the displacement amount of the tightening nut 13n with respect to the support plate 7 accompanying the rotation of the pinion portion 13t when adjusting the tension of the endless belt 16.
When adjusting the tension of the endless belt 16, the operation panel 13u is operated to rotate the worm gear 13s as indicated by the arrow K, so that the tightening nut 13n is moved with respect to the outer peripheral edge of the long hole 7a via the pinion portion 13t. Loosen temporarily and retighten.

Thereby, the rotating shaft 13a is moved along the longitudinal direction N of the long hole 7a by the urging force of the compression coil spring 13m, and the endless belt 16 is loosened (ex. 1.0 mm to 3.0 mm) to remove the endless belt. Appropriate tension is applied to 16.
At this time, with the tightening of the tightening nut 13n to the support plate 7, the support plate 7 is sandwiched between the tightening nut 13n and the housing 7e to hold the tension pulley 13. The housing 7e functions as a stopper fitted around the rotary shaft 13a, and is pressed against the support plate 7 by tightening the tightening nut 13n.
Further, as a component of the tension adjusting member 14, a servo motor connected to the operation panel 13 u and a sensor that detects looseness of the endless belt 16 may be provided. In this case, when the sensor detects the looseness of the endless belt 16, the servomotor is energized, and the tightening nut 13n is temporarily loosened and retightened with respect to the outer peripheral edge of the long hole 7a via the pinion portion 13t. To make it work.

As a modification of the tension adjusting member 14, as shown in FIG. 3B, the support plate 7 may be formed in an angle shape from the main plate 7A and the bent side 7B. In the angle-shaped support plate 7, a male screw portion 13b is formed at the tip of the rotating shaft 13a, the elongated hole 7a is formed in the main plate 7A, and the rotating shaft 13a can be moved along the longitudinal direction N of the elongated hole 7a. Is inserted through.
The adjusting screw rod 14m is provided in a state of being connected to the flange portion 7e in the intersecting direction D orthogonal to the rotating shaft 13a. The tip end portion of the adjusting screw rod 14m is inserted into a through hole (not shown) formed in the bent plate 7B so as to be able to advance and retreat.

The tightening nut 14p is disposed in communication with the through hole of the bent plate 7B, and is rotatably attached to the bent plate 7B via a rolling member (not shown) such as a thrust bearing (FIG. 3). (See arrow Km in (b)). The tightening nut 14p is threadably engaged with a portion 14j of the adjusting screw rod 14m that protrudes outward from the through hole of the bent plate 7B, and forms a pinion portion 14q on the outer peripheral side surface.
The worm gear 14n is disposed between the fixed walls 14s and 14t of the bent plate 7e so as to be orthogonal to the adjusting screw rod 14m, and meshes with the pinion portion 14q of the tightening nut 14p.

  When the tension of the endless belt 16 is adjusted, the tightening nut 14p is rotated around the adjusting screw rod 14m via the pinion portion 14q by rotating the worm gear 14n with the operation panel 14u. Accordingly, the rotary shaft 13a is guided and moved along the longitudinal direction N of the long hole 7a in the direction perpendicular to the rotary shaft 13a, and the adjusting screw rod 14m is moved outward along the axial direction Jn. The looseness (ex. 1.0 mm to 3.0 mm) is removed, and an appropriate tension is applied to the endless belt 16.

As described above, the tension of the endless belt 16 can be adjusted by tightening the tightening nut 14p through the pinion portion 14q by rotating the worm gear 14n. Therefore, the tension can be adjusted quickly with a simple operation. Can do. That is, when adjusting the tension of the endless belt 16, it is only necessary to rotate the worm gear 14n in the retightening direction in which the tension of the endless belt 16 is applied, and the tension of the endless belt 16 can be quickly adjusted with a simple operation. Adjustment work is improved.
In this case, the tightening nut 13n omits the pinion portion 13t of FIG. 3A and is screwed into the male screw portion 13b of the rotating shaft 13a. When the tension of the endless belt 16 is adjusted, the tightening nut 13n is temporarily loosened and retightened with respect to the outer peripheral edge of the long hole 7a in accordance with the turning operation of the operation panel 14u.

In addition, about the surface of the tension pulley 13 which hangs the endless belt 16, as shown in FIG.3 (b), even if it formed the tooth | gear 13w, it may become the smooth surface without a tooth shape.
As the urging member, a spring member such as a tension coil spring may be used instead of the compression coil spring 13m shown in FIG. 3A. In short, the rotary shaft 13a extends along the longitudinal direction N of the long hole 7a. Any device may be used as long as it is urged to move.
Further, since the worm gear 14n has a self-locking function with respect to the pinion portion 14q, the tightening nut 13n serves as an auxiliary fixing member, and may be omitted if unnecessary.

Furthermore, as a component of the tension adjusting member 14, a servo motor connected to the operation panel 14u and a sensor for detecting looseness of the endless belt 16 may be provided. In this case, when the sensor detects the looseness of the endless belt 16, the servomotor is energized, and the tightening nut 14 p is rotated via the pinion portion 14 n.
3A and 3B, the second pulley 11, the worm gears 13s and 14n, the pinion portions 13b and 14q, and the operation panels 13v and 14u are exaggerated for the sake of clarity.

As shown in FIG. 4, the contact adjusting member 7 </ b> A adjusts the contact degree of the first pulley 10 and the second pulley 11 with respect to the rack teeth 2 a by providing the support plate 7 so as to be movable up and down with respect to the slider 6. To do. That is, the contact adjusting member 7A includes an upper and lower elongated hole 7e formed in the support plate 7 and an upper and lower screw 7g inserted through the upper and lower elongated hole 7e.
By changing the vertical position of the support plate 7 with respect to the vertical slot 7e and retightening the vertical screw 7g from the vertical slot 7e to the slider 6, the degree of contact between the first pulley 10 and the second pulley 11 with respect to the rack teeth 2a is increased. Adjustable. The same applies to the contact adjusting member 7A for the moving body 3 shown in FIG.

  A drive shaft 17 a having a drive pulley 17 is disposed at an intermediate portion of the support plate 7 between the first pulley 10 and the second pulley 11. The drive shaft 17 a is attached to the support plate 7 through the sleeve 18. A drive pulley 17 is fitted to the tip of the drive shaft 17a. The sleeve 18 passes through the auxiliary plate 19, and the drive shaft 17 is fixed to the support plate 7 by tightening screws 20 from the support plate 7 to the auxiliary plate 19.

The drive shaft 17a is connected to the rotation shaft 21a of the drive motor 21 that functions as a pulley drive unit.
The endless belt 16 is made of, for example, a synthetic resin such as rubber, and is stretched from the first pulley 10 to the second pulley 11, and hung on the tension pulley 13 and the auxiliary pulley 12 along the drive pulley 17. On the outer side of the endless belt 16, a large number of tooth side portions 16 a meshing with the rack teeth 2 a of the rack base 2 are arranged in parallel along the circumferential direction. The tooth edge part 16a is intermittently arranged in a direction orthogonal to the moving direction of the endless belt 16. The endless belt 16 is not limited to rubber and may be made of various synthetic resins.

  The drive motor 21 rotationally drives the rotation mechanism 21 </ b> A including the first pulley 10, the second pulley 11, the tension pulley 13, and the auxiliary pulley 12 by rotationally driving the drive pulley 17. Thereby, the endless belt 16 is circulated and moved along the circumferential direction, the tooth edge portions 16a are sequentially meshed with the rack teeth 2a, and the support plate 7 is moved as the moving body 4 along the rack base 2.

  The pressing plate 22 is disposed as a pressing member so that the tooth side portion 16a of the endless belt 16 is slidably contacted inside the meshing region H where the endless belt 16 moves. The endless belt 16 moves to the rack tooth 2a when the endless belt 16 moves. Stops jumping out of the way. Since the presser plate 22 is in sliding contact with the endless belt 16, the presser plate 22 is made of a material having low friction and high wear resistance (for example, polytetrafluoroethylene (PTFE)). The presser plate 22 is extended until the length dimension thereof becomes equal to the length dimension of the meshing region H. Note that a thin film of PTFE may be coated or affixed on the inner side of the endless belt 16 that is in sliding contact with the presser plate 22.

The presser adjusting member 23 adjusts the degree of sliding contact of the presser plate 22 with respect to the meshing region H by changing the position of the presser plate 22 with respect to the meshing region H. For this reason, as shown in FIG. 4, the presser adjusting member 23 includes a longitudinally long hole 23 a formed in the support plate 7 and an adjusting screw 24 through which the longitudinally long hole 23 a is inserted. A female screw portion 22 c corresponding to the adjustment screw 24 is formed on the rear end surface of the presser plate 22.
By changing the vertical position of the adjustment screw 24 with respect to the vertically long hole 7 and retightening the adjustment screw 24, the distance of the presser plate 22 with respect to the meshing region H is changed in length to adjust the degree of sliding contact.

In the above configuration, when the rotation mechanism 21A is driven to rotate, on the side of the endless belt 16 where the tooth edge portion 16a starts to mesh with the rack teeth 2a, the tip end portion 22a of the presser plate 22 quickly presses the tooth edge portion 16a into the rack. It is set so as to forcibly mesh with the teeth 2a. That is, the front end portion 22a of the presser plate 22 extends to a proximity range H1 of 2 mm-5 mm that does not interfere with the first pulley 10 (the closest approach position).
In this case, the left end portion 22a of the presser plate 22 is shown in consideration of the travel of the moving bodies 3 and 4 in the left direction, but the presser foot is considered in consideration of the travel of the moving bodies 3 and 4 in the right direction. The right end portion 22b of the plate 22 also extends to a proximity range H2 of 2 mm-5 mm that does not interfere with the second pulley 12 as with the left end portion 22a.

The left moving body 3 is configured as a three-wheeled body with respect to the right moving body 4 and constitutes a rotating mechanism 21B in which the tension pulley 13 and the auxiliary pulley 12 are omitted, and the drive pulley 17 also serves as a tension pulley. I am letting. That is, as shown in FIG. 5, the drive shaft 17 a is disposed in a vertically long hole 9 a formed in the support plate 7 with the sleeve 18 passing through the auxiliary plate 20. The support plate 7 is formed with a small vertical hole 9b, and the auxiliary plate 20 is formed with a female screw portion 9c.
A tension adjusting member 14A that adjusts the tension on the endless belt 16 is configured by moving the drive shaft 17a up and down in the vertically long hole 9a and refastening the screw 9d from the small vertically long hole 9b to the female screw portion 9c. .

[Effect of Example 1]
In the first embodiment, the rack base 2 is used in combination with the rotation mechanisms 21A and 21B and the endless belt 16, and as shown by the moving bodies 3 and 4, it can be applied to both a short distance and a long distance.
Since the tooth edge portion 16a of the endless belt 16 is meshed with the rack teeth 2a, the number of simultaneously meshing teeth increases, and the transmission force from the endless belt 16 to the rack base 2 can be improved.
The simple structure that meshes the endless belt 16 with the rack teeth 2a of the rack base 2 makes it possible to realize light weight, quietness, high speed, oil-free and non-backlash. And durability can be improved.

Since the endless belt 16 is made of rubber, it can be cited that the expansion and contraction due to heat is large and that the service life is shorter than that of a metal gear (not shown). However, the endless belt 16 has recently been employed in harsh environments such as a camshaft drive of an OHCD engine (not shown) and a rear wheel drive of a two-wheeled vehicle, and concerns about the service life are being eliminated.
Further, the tension adjusting member 14 has a simple structure including a long hole 7a in which the rotary shaft 13a is inserted into the male screw portion 13b and the support plate 7 and the tightening nut 15, and can contribute to cost reduction.

The front end portion 22a of the presser plate 22 extends to a position where the tooth side portion 16a of the endless belt 16 begins to mesh with the rack teeth 2a.
Thereby, the front end portion 22a of the presser plate 22 can quickly press the tooth edge portion 16a and mesh with the rack teeth 2a, and in particular, it is possible to ensure smooth movement of the endless belt 16 with respect to the rack teeth 2a at the start of driving. it can.

As shown in FIG. 6A, the engagement between the endless belt 16 and the rack teeth 2a is small when the pressure angle θ is small and the transmission efficiency is good, but when the moving bodies 3 and 4 run at a high speed or receive a high load. The tooth edge 16a of the endless belt 16 may be lifted from the rack tooth 2a (see FIG. 6B). In order to prevent this, the presser plate 22 is provided in a light contact state with respect to the meshing region H of the endless belt 16 (see FIG. 6C). Even in a double-toothed belt in which tooth edge portions 16a are provided on both the outer side and the inner side of the endless belt 16, the presser plate 22 functions in the same manner as the endless belt 16 (see FIG. 6D).
Further, the contact adjusting member 7A may have a simple structure including the upper and lower elongated holes 7e and the upper and lower screws 7g, which saves space and is advantageous in terms of manufacturing cost.

In the both-end support structure (see FIG. 7A) provided on both sides so that the support plate 7 sandwiches the first pulley 10 and the second pulley 11, the first pulley 10 and the second pulley 10 are exchanged when the endless belt 16 is replaced. It is troublesome to pull out and attach the endless belt 16 to the pulley 11.
On the other hand, in the cantilever support structure in which the first pulley 10 and the second pulley 11 are attached to the single support plate 7 (see FIG. 7B), when the endless belt 16 is replaced, the first pulley 10 and The endless belt 16 can be easily pulled out and attached to the second pulley 11 and the tension on the endless belt 16 can be easily adjusted.

As for the mounting of the rack base 2 on the base 2F as the machine base or base, the mounting holes 2f are directly formed in the rack teeth 2a, and the tightening bolts 2e are inserted into the mounting holes 2f as fixing members and fastened to the base 2F. (See FIGS. 8A and 8B).
The endless belt 16 and the rack base 2 have an engagement structure (a plurality of teeth engagement) between the plurality of tooth sides 16a and the plurality of rack teeth 2a. It is possible to mount the bolts from the top surface of the rack, which does not affect the running of the belt 16 and is easy to install and maintain the rack base 2.

As for the rack base 2, a plurality of single rack bases 2w are used together, but even if a gap of about one tooth or two teeth is set between adjacent single rack bases 2w, it will hinder driving. Does not occur (see FIG. 8C). For this reason, there is an advantage that a large distance can be set with a small number of additions of the single rack base 2w.
In manufacturing the rack base 2, among the metals, for example, the rack teeth 2a can be formed by rolling the aluminum material 4s between the rolling tool 2k and the feed roller 2n (see FIG. 9A).
The rack base 2 can also be formed by pressing the rack teeth 2a formed by sheet metal press molding in the direction of arrow J with respect to the base plate 2j and attaching them by spot welding or the like (FIGS. 9B and 9C). reference).

  As a modification example of the mounting of the rack base 2 to the base 2F, there is a mounting fixing structure shown in FIGS. The rack base 2 in this mounting and fixing structure has an insertion hole 2s through which the shaft portion 2E of the tightening bolt 2e passes through the mounting hole 2f in the height direction Z1. The mounting holes 2f are provided at a predetermined interval Tm along the longitudinal direction T of the base 2F.

As shown in FIG. 10B, a cylindrical cavity 2y is provided at the lower end of the rack base 2, and the lower end of the cavity 2y is a truncated cone space 2r. The inner peripheral surface of the space 2r is an inner tapered surface 2p whose diameter is gradually reduced so as to become narrower toward the rack tooth 2a (see also FIG. 10C). The metal piece 2q made of iron or the like is a truncated cone-shaped member formed corresponding to the shape of the space 2r, and the outer peripheral portion is an outer tapered surface 2k. A female screw portion 2u penetrating along the axial direction is drilled in the central portion of the piece portion 2q. As will be described later, when the piece portion 2q is fitted into the space portion 2r, the piece portion 2q is concentric with the space portion 2r and the insertion hole 2s, and the female screw portion 2u is disposed coaxially with the insertion hole 2s.

As shown in FIG. 10A, a long groove 2M having a width dimension Ws corresponding to the width dimension Wr of the rack base 2 is formed along the longitudinal direction T on the surface of the base 2F.
When the rack base 2 is attached to the base 2F, the rack base 2 in a state where the piece portion 2q is fitted into the space portion 2r is fitted into the long groove 2M. Thereby, the vertical outer wall surface 2v of the rack base 2 comes into close contact with the vertical inner wall surface 2Ms of the long groove 2M. In this state, the shaft portion 2E of the tightening bolt 2e is screwed into the female screw portion 2u of the piece portion 2q through the insertion hole 2s.

Along with this, the piece 2q is slightly displaced in the axial direction Nm, the outer tapered surface 2k is brought into sliding contact with the inner tapered surface 2p of the space 2r, and the vertical outer wall surface 2v of the rack base 2 is caused by the wedge action generated. Is deformed so as to bulge outward Ns (for example, in units of several microns).
Thereby, the vertical outer wall surface 2v as the outer wall surface is in strong pressure contact with the vertical inner wall surface 2Ms as the inner wall surface of the long groove 2M, so that the rack base 2 is securely attached and fixed to the base 2F. At this time, the deformation in which the vertical outer wall surface 2v bulges outward Ns may be elastic deformation or plastic deformation.
The head 2j of the tightening bolt 2e is provided with a hexagonal hole 2w shown in FIG. 10C, and the tightening bolt 2e is tightened by a hexagon wrench (not shown) as a dedicated tool.

FIG. 10 (d) shows a modification in which an outer fitting tapered surface 3u is provided at the lower end portion of the vertical outer wall surface 2v of the rack base 2 so as to spread outwardly in a skirt shape and to be inclined downward. The opposing width Wt of the vertical inner wall surface 2Ms of the long groove 2M forms an inner groove taper surface 3v that gradually becomes narrower as it goes upward.
In attaching the rack base 2 to the base 2F, the rack base 2 is fitted to the long groove 2M by sliding from the side. Along with this, the outer fitting tapered surface 3u comes into close contact with the inner groove tapered surface 3v in a prevented state.

  The mounting and fixing structure of the rack base 2 can be realized by a simple operation in which the tightening bolt 2e is screwed into the female screw portion 2u of the piece portion 2q through the insertion hole 2s. That is, the mounting and fixing structure may be a member composed of the insertion hole 2s, the inner tapered surface 2p, the piece 2q, the long groove 2M, and the tightening bolt 2e of the rack base 2, so that the assembly process for mounting the rack base 2 to the base 2F is small. Thus, the rack base 2 can be securely attached and fixed to the base 2F by a simple operation, and as a result, productivity can be improved.

[Configuration of Example 2]
11A and 11B show Example 2 of the present invention. The difference between the second embodiment and the first embodiment is that a trapezoidal piece portion 2q having an inclined tapered outer tapered surface 2k is used instead of the truncated cone-shaped piece portion 2q. Accordingly, the space 2r of the rack base 2 is formed in a trapezoidal shape corresponding to the piece 2q (see FIG. 11A).
In this case, when the piece portion 2q is fitted into the space portion 2r and the tightening bolt 2e is screwed into the female screw portion 2u, the outer tapered surface 2k of the piece portion 2q becomes the inner tapered surface 2p of the space portion 2r. It is pressure contact.
In the second embodiment, since the trapezoidal piece 2q is fitted in the trapezoidal space 2r, when the fastening bolt 2e is screwed into the female screw 2u, the piece 2q is rotated together with the fastening bolt 2e. There is nothing to do.
When manufacturing the trapezoidal piece portion 2q, as shown in FIG. 11 (b), by cutting the long bar member 2U having a trapezoidal cross section into predetermined length dimensions, a large number of piece portions are obtained. 2q can be quickly formed by a simple operation.

[Configuration of Example 3]
FIG. 11C shows Embodiment 3 of the present invention. The third embodiment is different from the first and second embodiments in that a vertical slit 2z communicating with the space 2r is formed on the vertical outer wall surface 2v of the rack base 2. In this case, when the fastening bolt 2e is screwed into the female screw portion 2u of the piece portion 2q, there is an advantage that the vertical outer wall surface 2v is easily deformed outward.

[Configuration of Example 4]
FIG. 12 shows a fourth embodiment of the present invention. Example 4 differs from Examples 1 and 2 in that a strain gauge 4w (strain gauge) is attached to the inner peripheral surface of the upper end of the cavity 2y of the rack base 2.
Although the tightening bolt 2e is screwed into the female screw portion 2u with a predetermined torque, the tightening bolt 2e corresponds to a case where it falls below or exceeds the proper tightening torque range.

For this reason, the strain gauge 4w is connected to the notification unit 5m via the deformation amount detection sensor 5s, the central processing unit CPU, and the activation unit 5t to form a deformation amount detection unit.
When the tightening bolt 2e falls below or exceeds the proper tightening torque range with long-term use, an output based on the deformation amount (strain amount) of the strain gauge 4w is detected by the deformation amount detection sensor 5s. A deformation amount (distortion amount) by the output is calculated by the central processing unit CPU, and a calculation signal is output to the starting unit 5t to activate the notification unit 5m. By the operation of the notification unit 5m, the lamp can be blinked or a buzzer can be sounded to notify the user concerned.

[Configuration of Example 5]
FIG. 13 shows a fifth embodiment of the present invention. The fifth embodiment differs from the first embodiment in that a sliding ball 5w is provided between the outer tapered surface 2k of the piece 2q and the inner tapered surface 2p of the space 2r (FIGS. 13A and 13B). b)).
In this case, as shown in FIG. 13C, the outer taper surface 2k is formed with an outer groove 5u along the up and down inclination direction, and the inner taper surface 2p has an inner groove facing the outer groove 5u. A groove 5v is formed. A sliding ball 5w is slidably arranged in a state inscribed in the outer groove 5u and the inner groove 5v.

Therefore, when the tightening bolt 2e is screwed into the female screw portion 2u, the outer tapered surface 2k of the piece portion 2q moves along the inner tapered surface 2p via the sliding ball 5w, so that the piece portion 2q is moved to the inner tapered surface 2p. Therefore, the rack base 2 can be quickly attached to the base 2F. Moreover, since the sliding ball 5w is arranged over the outer groove groove 5u and the inner groove groove 5v, when the tightening bolt 2e is screwed into the female screw portion 2u, the piece portion 2q can be rotated together with the tightening bolt 2e. Absent.
Also in Example 1-4, the same outer groove 5u and inner groove 5v as in Example 5 may be provided, and the sliding ball 5w may be provided between the piece portion 2q and the inner tapered surface 2p.

[Configuration of Example 6]
FIG. 14 shows a sixth embodiment of the present invention. The sixth embodiment differs from the first embodiment in that hanging sides 22e and 22f that are suspended from both sides of the rack base 2 and surround the endless belt 16 are provided on both sides of the holding plate 22 along the longitudinal direction of the rack base 2. It was formed integrally. In this case, the rack base 2 is fixedly mounted on the base 2Y via the machine base 2A installed on the installation surface G.

The reason why the hanging side portions 22e and 22f are formed on the holding plate 22 is to restrict the endless belt 16 from being removed from the rack base 2 by the hanging side portions 22e and 22f.
In general, an annular flange that prevents the endless belt 16 from coming off is provided on each outer peripheral portion of the first pulley 10, the second pulley 11, the tension pulley 13, and the auxiliary pulley 12 (reference numeral 17S in FIG. 4). reference).

  In the sixth embodiment, since the drooping side portions 22e and 22f are provided, the endless belt 16 is prevented from coming off from various pulleys constituting the rotating mechanism 21A. For this reason, it is not necessary to provide the annular flange 17S on various pulleys, and the various pulleys become inexpensive, which can contribute to the cost reduction of the belt / rack type driving device 1.

Further, when the endless belt 16 is removed from various pulleys by exchanging the endless belt 16 or the like, the adjusting screw 24 can be loosened and the presser plate 22 can be pulled upward from the endless belt 16.
In this state, the endless belt 16 can be easily detached from various pulleys by pulling the endless belt 16 outward. For this reason, unlike various pulleys having the annular flange 17S, a troublesome force operation for forcibly extending the endless belt 16 and overcoming the annular flange 17S becomes unnecessary.

[Configuration of Example 7]
FIG. 15A shows Example 7 of the present invention. Example 7 differs from Example 1 in that the tooth surface of the rack tooth 2a is given surface roughness by, for example, shot blasting (including sand blasting) or the like, and the matte processing part 30 as a friction sliding surface is provided. It has been done.
Of the surface roughness processing, the matte processing portion 30 generates a frictional force that resists the separation when the tooth edge portion 16a is detached from the rack tooth 2a (resistance frictional force against separation).
For this reason, when a large thrust is applied to the endless belt 16, as shown in FIG. 15C, jumping of the tooth edge portion 16 a from the rack tooth 2 a is suppressed, and the frictional force of the presser plate 22 against the endless belt 16 is reduced. This contributes to improving the efficiency of propulsion transmission force from the endless belt 16 to the rack base 2.
The satin processing portion 30 may be only the tooth side surface of the rack tooth 2a, and may not be applied to the tooth tip surface that is the top.

Incidentally, FIG. 15B is an experimental tool used in the tensile test. A weight Wg having a predetermined weight is vertically applied to the endless belt 16, and a pulling force Pg is applied to the endless belt 16 in the longitudinal direction T1 in this state. The scale was measured with.
As a result, it was found that the frictional force of the tooth edge portion 16a with respect to the rack tooth 2a is 11 kg as a resistance frictional force against separation, which is significantly improved as compared with the conventional 8 kg.

[Configuration of Example 8]
FIG. 15D shows an eighth embodiment of the present invention. Example 8 is different from Example 1 in that a plurality of streaks 31a are formed on the tooth surface of the rack tooth 2a by surface processing 31 as surface roughness imparting, and the tooth edge part 16a is formed from the rack tooth 2a. At the time of detachment, the streaks 31a generate a retaining force that resists detachment.
For this reason, like Example 6, the jumping from the rack tooth 2a of the tooth edge part 16a is suppressed, and it contributes to the efficiency improvement of the propulsion transmission force from the endless belt 16 to the rack base 2. The streak portion 31a may be formed by forming a ridge or a recess like a horizontal streak, a vertical streak, or a mesh part.

[Configuration of Example 9]
FIG. 16 shows Embodiment 9 of the present invention. Example 9 differs from Example 1 in that the rack tooth 2a is provided on the tooth surface as a curved surface portion 33 that protrudes outward (see FIG. 16A). When the tooth side portion 16a is detached from the rack tooth 2a, the curved surface portion 33 bites into the tooth side portion 16a, thereby generating a retaining force that resists the removal (see FIG. 16B).
For this reason, as in the third embodiment, the jumping of the tooth edge portion 16a from the rack tooth 2a is suppressed, and this helps improve the efficiency of the propulsion transmission force F from the endless belt 16 to the rack base 2 (see FIG. 16C). ).
As the curved surface portion 33, a conical curved surface such as a circular curved surface, a parabolic curved surface, an elliptical curved surface, or a hyperboloid surface may be set.

[Configuration of Example 10]
FIG. 17 shows a tenth embodiment of the present invention. The tenth embodiment differs from the first embodiment in that the rotation mechanism 21A is installed in the solid holder 25F, and the rack base 2 (cross-sectional rectangle, cross-section circle) is movably passed through the holder 21B (see FIG. 17 (a) and (b)).
In this case, since the rack base 2 also serves as a linear guide, the slider guide 5 and the slider 6 are not required, and the overall structure is simplified.

[Configuration of Example 11]
18 and 19 show Embodiment 11 of the present invention. Example 11 differs from Example 1 in that the rack base 2 is formed in an annular shape (see FIG. 18). Since the rack base 2 has a large diameter, the arc-shaped rack sides 2t are connected at the abutting portion to form a large circular body.
When the rack base 2 is an annular structure, it is suitable for rotationally driving a large-diameter structure such as the magnet base 2m of the MRI apparatus (see FIG. 19).

[Configuration of Example 12]
FIG. 20 shows Embodiment 12 of the present invention. The difference between the twelfth embodiment and the first embodiment is that the rotating rollers 35 a, 35 b, and 35 c are used in place of the presser plate 22.

The rotating rollers 35a, 35b, and 35c have their respective supporting shafts attached to the support plate 7 in a cantilevered state. The axial directions of the rotating rollers 35a, 35b, and 35c are the longitudinal direction T and the meshing region H of the endless belt 16. Is oriented at right angles. The rotating rollers 35a, 35b, and 35c are in light contact with the meshing region H in parallel with each other.
In the eighth embodiment, even when the rotating rollers 35a, 35b, and 35c are used as pressing members, the same effect as that obtained by the pressing plate 22 can be obtained.

[Configuration of Example 13]
FIG. 21 shows Embodiment 13 of the present invention. Example 13 differs from Example 1 in that the compression coil spring 40 is provided as a spring member in the right moving body 4 in which the drive pulley 17 also serves as the tension pulley in the tension adjusting member 14A. .
In this case, the tension pulley is provided so as to be movable up and down with respect to the support plate 7, and is provided so as to be displaceable in the separating direction with respect to the endless belt 16.

  The tension pulley is urged in a direction in which it comes into sliding contact with the endless belt 16 by a compression coil spring 40 as a spring member, and adjusts the tension applied to the endless belt 16 in magnitude. That is, one end of the compression coil spring 40 is connected to a stationary member 41 that moves integrally with the support plate 7, and the other end is connected to the central portion 42 of the tension pulley.

In the thirteenth embodiment, the tension pulley is continuously pressed against the endless belt 16 by the urging force of the compression coil spring 40. Therefore, the tension pulley can always follow the endless belt 16 and apply tension without excess or deficiency. .
The drive pulley 17 may be replaced with a tension pulley, and the role of the drive pulley 17 may be played by the first pulley 10 or the second pulley 11.

[Configuration of Example 14]
FIG. 22A shows Embodiment 14 of the present invention. The fourteenth embodiment differs from the first embodiment in that the rack tooth 2a has a tooth trace surface portion 2c that forms an angle α within the range of 85 to 90 degrees with respect to the rack base 2 on a straight line, and a tooth bottom surface that is depressed in the bottom direction. A portion 2d. In this case, the tooth edge portion 16a of the endless belt 16 forms a tooth trace flat surface portion 16b that engages and meshes with the tooth trace surface portion 2c, and a curved tooth top projection surface portion 16c that engages and meshes with the tooth bottom surface portion 2d. doing.

  In the fourteenth embodiment, the rack tooth 2 a has the tooth trace surface portion 2 c that forms an angle α within the range of 85 to 90 degrees with respect to the rack base 2, so the tooth trace surface portion 2 c is in the traveling direction W of the endless belt 16. In contrast, the angle α is close to a right angle (within an angle range of 85 to 90 degrees).

  As a result, the pressure angle β of the tooth trace plane portion 16b with respect to the tooth trace surface portion 2c of the rack tooth 2a is remarkably reduced (β = 90−α), and the teeth on the tooth trace surface portion 2c are engaged when the endless belt 16 is engaged with the rack teeth 2a. The mesh transmission force of the muscle plane portion 16b becomes strong, and the tooth edge portion 16 of the endless belt 16 does not lift from the rack teeth 2a. This eliminates the need for a separate pressing member that holds the endless belt 16 on the rack base 2 side. The pressure angle β means an angle formed by the reference line Y lowered to the rack base 2 and the tooth trace surface portion 2c of the rack tooth 2a.

  Further, since the tooth tip projecting surface portion 16c engages with the tooth bottom surface portion 2d as the introduction portion of the rack tooth 2a, the tooth edge portion 2b can be smoothly engaged with the rack tooth 2a when the endless belt 16 is engaged. it can.

On the other hand, a normal standard timing belt has a trapezoidal tooth surface for smooth meshing. Although there are tooth surfaces that are rounded by chamfering, the pressure angle is large, and when the timing belt is engaged with a linear rack, the timing belt is easily lifted from the rack.
Note that the tooth tip protruding surface portion 16c may be formed along a curved surface such as a hemispherical surface or an elliptical surface, a parabolic surface, or a conical curved surface such as a hyperboloid.

  FIG.22 (b) shows the modification of Example 14, and shows the example which replaced with the curved-shaped tooth-tip projecting surface part 16c and made the tooth-tip projecting surface part 16c of the cross-section inverted trapezoid shape. The tooth bottom surface portion 2d with which the tooth tip projecting surface portion 16c engages and meshes is also formed in an inverted trapezoidal shape.

[Configuration of Example 15]
FIG. 23 shows Embodiment 15 of the present invention. Example 15 differs from Example 14 in that the tooth edge part 16a of the endless belt 16 forms a tooth trace plane part 16b and a tooth tip projecting part 16c as tooth profile, and the rack tooth 2a is in relation to the rack base 2. This is to have the tooth trace surface portion 2c having a greater inclination than the tooth trace plane portion 16b.

That is, as shown in FIGS. 23A and 23B, the inclination angle φ1 of the tooth trace surface portion 2c with respect to the rack base 2 is different from the inclination angle φ2 of the tooth trace plane portion 16b, and the former inclination angle φ1 is The root angle M1 of the rack tooth 2a is set to be larger than the tooth root width M2 of the tooth edge portion 16a by making it larger than the latter inclination angle φ2.
Thus, when the tooth edge portion 16a is engaged with the rack tooth 2a, the tooth tip protruding surface portion 16c engages and meshes with the tooth bottom surface portion 2d, but the tooth trace gap between the tooth trace plane portion 16b and the tooth trace surface portion 2c. Sp is formed.

In this state, when a driving force in the pulling direction S is applied to the endless belt 16, as shown in FIG. 23 (c), the corner on the pulling side becomes the fulcrum P1 at the bottom surface portion 2d of the rack tooth 2a. The 16 tooth trace plane portions 16b are drawn toward the pull side. The tensile force is a rotational force R around the fulcrum P1 with respect to the tooth edge portion 16a, and the tooth force portion 16a acts in a direction close to the tooth trace surface portion 2c by the component force, and the endless belt 16 is stretched on the rack tooth 2a. I will attach it.
For this reason, even if a pressing member for the endless belt 16 is not provided, the endless belt 16 does not lift from the rack teeth 2a, and efficient power transmission between the endless belt 16 and the rack teeth 2a becomes possible. Incidentally, when the scale is measured with the pull gauge Pg of FIG. 15 (b), it shows a durability of 5.6 kg as a resistance frictional force against separation.

[Configuration of Example 16]
FIG. 24 shows Embodiment 16 of the present invention. Example 16 differs from Example 14 in that flange bands 16h are provided at both end portions 16e and 16f of the endless belt 16 (see FIG. 24A).

The flange band 16h is formed along the entire circumference of the endless belt 16 and is disposed so as to sandwich the rack base 2 (see FIG. 24B). In this case, the flange band 16h is provided with notches 16n at a predetermined pitch interval, so that a large number of flange side portions 16q are formed so as not to hinder good flexibility of the endless belt 16.
In the fifteenth embodiment, the endless belt 16 can be held at the regular position by the flange band 16h, and the endless belt 16 is not inadvertently detached from the rack base 2 during traveling.
In addition, the flange side part 16q may be arrange | positioned in the location corresponding to the tooth side part 16a, or may be arrange | positioned between adjacent tooth side parts 16a.

[Configuration of Example 17]
FIG. 25 shows Embodiment 17 of the present invention. The difference between the seventeenth embodiment and the fifteenth embodiment is that the rack tooth 2a has a tooth trace surface portion 2c having a smaller inclination with respect to the rack base 2 than the tooth trace plane portion 16b.

That is, as shown in FIGS. 25A and 25B, the inclination angle δ2 of the tooth trace surface portion 2c with respect to the rack base 2 is different from the inclination angle δ1 of the tooth trace plane portion 16b, and the latter inclination angle δ1 is set as follows. The tooth base width Q1 of the tooth edge portion 16a is set wider than the tooth root width Q2 of the rack tooth 2a by making it larger than the former inclination angle δ2.
Thus, when the tooth edge portion 16a is engaged with the rack tooth 2a, the tooth tip protruding surface portion 16c engages and meshes with the tooth bottom surface portion 2d, but the tooth trace gap between the tooth trace plane portion 16b and the tooth trace surface portion 2c. Sp is formed.

  In this state, when the driving force in the pulling direction S is applied to the endless belt 16, the tip portion of the rack tooth 2a bites into the bottom end portion of the tooth edge portion 16a as indicated by a point P2 in FIG. So that stress is concentrated. Due to the concentrated action of the stress, the tooth edge portion 16a acts in a direction approaching the tooth trace surface portion 2c, and the endless belt 16 is stuck to the rack tooth 2a.

For this reason, as in the fifteenth embodiment, the endless belt 16 does not lift from the rack teeth 2a without providing a pressing member for the endless belt 16, and efficient power can be generated between the endless belt 16 and the rack teeth 2a. Communication is possible.
The inclination angle δ2 of the tooth trace surface portion 2c in the rack tooth 2a may be set to an angle range of 20 to 0 degrees, for example.

[Configuration of Example 18]
FIG. 26 shows Embodiment 18 of the present invention. Example 18 differs from Example 15 or Example 17 in that the tooth trace surface portion 2c of the rack tooth 2a is set to form an angle of 90 degrees with respect to the rack base 2.
When a driving force in the pulling direction S acts on the endless belt 16, as shown by a point P2, the tip portion of the rack tooth 2a concentrates a stronger biting stress on the bottom end portion of the tooth edge portion 16a. Due to the concentration of the biting stress, the tooth edge portion 16a acts strongly in the direction approaching the tooth trace surface portion 2c, and the endless belt 16 is firmly attached to the rack tooth 2a. Incidentally, when the scale is measured with the pull gauge Pg of FIG. 15 (b), it shows a durability of 23.0 kg as a resistance frictional force against separation.

[Modification]
(A) Although various types of pulleys constituting the rotation mechanism 21A have smooth surfaces, they may be toothed pulleys in which tooth grooves corresponding to the tooth edge portions 16a are formed outside the endless belt 16.
Further, the endless belt 16 is not limited to the one having the tooth side portions 16a formed on the outer side, and may be a double tooth belt having tooth side portions formed on both the outer side and the inner side.
(B) The tooth edge portion 16a of the endless belt 16 is not limited to a rectangular cross section, and may form a semicircular shape, a semielliptical shape, or an appropriate curved surface.

(C) The material of the presser plate 22 is not limited to the PFET having low friction and high wear resistance because it is slidably contacted with the endless belt 16, and other plastic materials having similar characteristics may be used.
(D) The power source of the drive motor 21 is not limited to the power source, and a battery (storage battery) may be used. Instead of the drive motor 21, the driving force of the engine of the internal combustion engine may be used.

(E) The number of various pulleys constituting the rotating mechanisms 21A and 21B is not limited to five wheels or three wheels, and is constituted by two wheels of a first pulley and a second pulley. One of them may be a drive pulley. The number of pulleys provided in the rack base 2 may be changed as desired according to the use situation, load situation, and the like.
(F) The endless belt 16 is not limited to a single-toothed belt, and a double-toothed belt shown in FIG. 6D may be used.

  In the belt / rack type driving device of the present invention, the rack base is used in combination with a pulley and an endless belt, and can be applied to both a short distance and a long distance, and has a simple structure and a robust and excellent durability mechanism. . For this reason, the merit of the mechanism can stimulate the demand of the contractor and can be used for the machine industry through the distribution of related parts.

DESCRIPTION OF SYMBOLS 1 Belt rack type drive device 2 Rack base 2a Rack tooth 2b Tooth tip surface 2c Tooth surface surface part 2d Tooth bottom surface part 2y Cavity part 2v Vertical type outer wall surface (outer wall surface)
2Ms vertical inner wall (inner wall)
2u Female screw part 2q Piece part 2s Insertion hole 2e Mounting bolt 2M Long groove 2r Space part 2k Outer taper surface 2p Inner taper surface 2z Slit 2F Pedestal (machine base, base)
3, 4 Moving body 4w Strain gauge 5 Slider guide 6 Slider 7 Support plate 7A Contact adjusting member 10 First pulley 11 Second pulley 13 Tension pulley 16 Endless belt 16a Tooth side part 16b Tooth trace plane part 16c Tooth tip projecting part 16k Projection 16h Flange band 16q Flange side 17 Drive pulley 17a Drive shaft 21 Drive motor (pulley drive part)
21A, 21B Rotating mechanism 22 Presser plate (presser member)
22a, 22b Presser plate front end 22e, 22f Presser plate hanging side 23 Presser adjusting member H Engagement region P Pitch interval N Long hole longitudinal direction T Endless belt longitudinal direction Sp Tooth trace gap

Claims (14)

A rack base mounted on a pedestal, with a number of rack teeth arranged in parallel at a predetermined pitch interval;
A support plate provided on the rack base and slidably mounted in the longitudinal direction of the rack base;
A first pulley and a second pulley that are spaced apart from the support plate by a predetermined distance and are rotatably mounted together;
It said entrained first the second pulley from the pulley, and an endless belt are arranged in parallel along the rack stand of said plurality of teeth edges in mesh with the rack teeth in the circumferential direction,
By rotating and driving the first pulley and the second pulley, the endless belt is circulated along the circumferential direction, and the tooth side portions are sequentially meshed with the rack teeth, and the support plate is used as a moving body. A pulley drive section that moves along the rack base;
A tension pulley that is rotatably attached to the support plate via a rotation shaft and applies tension to the endless belt;
The mounting and fixing structure for attaching the rack base to the pedestal is:
An insertion hole formed in a penetrating state in the height direction in the rack base;
An inner tapered surface set so that the inner peripheral surface of the space portion formed in the lower end portion of the cavity portion provided at the lower end portion of the rack base is narrowed toward the rack teeth ;
A piece portion formed corresponding to the shape of the space portion, having a female screw portion penetrating along the axial direction in the center portion, and having an outer peripheral portion as an outer tapered surface in contact with the inner tapered surface,
A long groove formed on the surface of the pedestal along the longitudinal direction and fitting the rack base;
The insertion hole through the screwed by screwing the female screw portion of the pawl member, the outer tapered surface is slid pressed against the inside tapered surface of the space portion, varying the rack base outer wall surface outwardly It is shaped, and a clamping bolt is pressure contact with the inner wall surface of the long groove,
The rack teeth each have a tooth trace surface portion that forms an angle within a range of 85 to 90 degrees with respect to the rack base and a tooth bottom surface portion that is recessed in a bottom-bottom direction, and the tooth edge portion of the endless belt includes: A belt-and-rack type driving device comprising: a tooth trace plane portion that engages and meshes with the tooth trace surface portion; and a tooth tip projection surface portion that engages and meshes with the tooth bottom surface portion. A rack base mounted on a pedestal, with a number of rack teeth arranged in parallel at a predetermined pitch interval;
A support plate provided on the rack base and slidably mounted in the longitudinal direction of the rack base;
A first pulley and a second pulley that are spaced apart from the support plate by a predetermined distance and are rotatably mounted together;
It said entrained first the second pulley from the pulley, and an endless belt are arranged in parallel along the rack stand of said plurality of teeth edges in mesh with the rack teeth in the circumferential direction,
By rotating and driving the first pulley and the second pulley, the endless belt is circulated along the circumferential direction, and the tooth side portions are sequentially meshed with the rack teeth, and the support plate is used as a moving body. A pulley drive section that moves along the rack base;
A tension pulley that is rotatably attached to the support plate via a rotation shaft and applies tension to the endless belt;
The mounting and fixing structure for attaching the rack base to the pedestal is:
An insertion hole formed in a penetrating state in the height direction in the rack base;
An inner tapered surface set so that the inner peripheral surface of the space portion formed in the lower end portion of the cavity portion provided at the lower end portion of the rack base is narrowed toward the rack teeth ;
A piece portion formed corresponding to the shape of the space portion, having a female screw portion penetrating along the axial direction in the center portion, and having an outer peripheral portion as an outer tapered surface in contact with the inner tapered surface,
A long groove formed on the surface of the pedestal along the longitudinal direction and fitting the rack base;
Through the insertion hole is screwed by threaded into the female screw portion of the pawl member, the outer tapered surface is slid pressed against the inside tapered surface of the space portion, the rack base outer wall surface outwardly It is deformation, and a clamping bolt is pressure contact with the inner wall surface of the long groove,
The tooth edge portion of the endless belt forms a tooth trace plane portion and a tooth tip projection surface portion as a tooth profile, and the rack teeth are tooth traces having an inclination angle different from the inclination angle of the tooth trace plane portion with respect to the rack base. A belt-and-rack type driving device having a surface portion and forming a tooth trace space between the tooth trace plane portion and the tooth trace surface portion when the tooth edge portion meshes with the rack teeth. A rack base mounted on a pedestal, with a number of rack teeth arranged in parallel at a predetermined pitch interval;
A support plate provided on the rack base and slidably mounted in the longitudinal direction of the rack base;
A first pulley and a second pulley that are spaced apart from the support plate by a predetermined distance and are rotatably mounted together;
It said entrained first the second pulley from the pulley, and an endless belt are arranged in parallel along the rack stand of said plurality of teeth edges in mesh with the rack teeth in the circumferential direction,
By rotating and driving the first pulley and the second pulley, the endless belt is circulated along the circumferential direction, and the tooth side portions are sequentially meshed with the rack teeth, and the support plate is used as a moving body. A pulley drive section that moves along the rack base;
A tension pulley that is rotatably attached to the support plate via a rotation shaft and applies tension to the endless belt;
The mounting and fixing structure for attaching the rack base to the pedestal is:
An insertion hole formed in a penetrating state in the height direction in the rack base;
An inner tapered surface set so that the inner peripheral surface of the space portion provided in the lower end portion of the cavity portion provided in the lower end portion of the rack base is narrowed toward the rack teeth ;
A piece portion formed corresponding to the shape of the space portion, having a female screw portion penetrating along the axial direction in the center portion, and having an outer peripheral portion as an outer tapered surface in contact with the inner tapered surface,
A long groove formed on the surface of the pedestal along the longitudinal direction and fitting the rack base;
The insertion hole through the screwed by screwing the female screw portion of the pawl member, the outer tapered surface is slid pressed against the inside tapered surface of the space portion, varying the rack base outer wall surface outwardly It is shaped, and a clamping bolt is pressure contact with the inner wall surface of the long groove,
A belt / rack type drive device, characterized in that a flange band is provided at both end portions of the endless belt so as to be formed along the entire circumference so as to sandwich the rack base. A rack base mounted on a pedestal, with a number of rack teeth arranged in parallel at a predetermined pitch interval;
A support plate provided on the rack base and slidably mounted in the longitudinal direction of the rack base;
A first pulley and a second pulley that are spaced apart from the support plate by a predetermined distance and are rotatably mounted together;
It said entrained first the second pulley from the pulley, and an endless belt are arranged in parallel along the rack stand of said plurality of teeth edges in mesh with the rack teeth in the circumferential direction,
By rotating and driving the first pulley and the second pulley, the endless belt is circulated along the circumferential direction, and the tooth side portions are sequentially meshed with the rack teeth, and the support plate is used as a moving body. A pulley drive section that moves along the rack base;
A tension pulley that is rotatably attached to the support plate via a rotation shaft and applies tension to the endless belt;
The mounting and fixing structure for attaching the rack base to the pedestal is:
An insertion hole formed in a penetrating state in the height direction in the rack base;
An inner tapered surface set so that the inner peripheral surface of the space portion provided in the lower end portion of the cavity portion provided in the lower end portion of the rack base is narrowed toward the rack teeth ;
A piece portion formed corresponding to the shape of the space portion, having a female screw portion penetrating along the axial direction in the center portion, and having an outer peripheral portion as an outer tapered surface in contact with the inner tapered surface,
A long groove formed on the surface of the pedestal along the longitudinal direction and fitting the rack base;
The insertion hole through the screwed by screwing the female screw portion of the pawl member, the outer tapered surface is slid pressed against the inside tapered surface of the space portion, varying the rack base outer wall surface outwardly It is the shape, the to and a clamping bolt is pressure contact with the inner wall surface belt-rack drive and wherein the long groove. At the lower end of the outer wall surface of the rack base, an outer fitting taper surface that spreads downward and inclines in a skirt shape, and
An inner groove taper surface which is formed on the inner wall surface of the long groove and gradually becomes narrower as it goes upward;
When the rack base is attached to the pedestal, the rack base is fitted to the long groove by sliding from the side, and the outer fitting taper surface is in close contact with the inner groove taper surface in a retaining state. The belt-rack type driving device according to any one of claims 1 to 4, characterized in that:   The belt-rack type driving device according to any one of claims 1 to 4, wherein a vertical slit communicating with the space portion is formed on the outer wall surface of the rack base. Having a strain gauge adhered to the inner peripheral surface of the upper end of the cavity of the rack base;
A notification unit is connected to the strain gauge via a deformation amount detection sensor, a central processing unit, and an activation unit, and when the tightening bolt falls below or exceeds an appropriate tightening torque range, the output from the strain gauge is deformed. 5. The system according to claim 1, wherein the notification unit is configured to be transmitted to the notification unit via a quantity detection sensor, the central processing unit, and the activation unit. Belt-rack type drive unit.   The outer taper surface is formed with an outer groove along the vertical inclination direction, the inner taper surface is formed with an inner groove facing the outer groove, and the outer groove and the inner groove are formed. 5. The belt-rack type driving device according to claim 1, wherein sliding balls are slidably disposed in a state in which the sliding balls are inscribed. The tooth side portion of the endless belt is slidably arranged inside the meshing region meshing with the rack teeth of the rack base , and prevents the endless belt from jumping from the rack teeth when the endless belt moves. The belt-rack type driving device according to claim 1, further comprising a pressing member that performs the pressing operation.   The belt / rack type driving device according to claim 9, further comprising a presser adjusting member that adjusts a sliding contact degree of the presser member with respect to the meshing region by changing a position of the presser member with respect to the meshing region. . A holding member that is slidably disposed inside a meshing region where the tooth side portion of the endless belt meshes with the rack teeth, and prevents the endless belt from jumping from the rack teeth when the endless belt moves; Have
Upon rotation of said first pulley and said second pulley, said the side the tooth side portion of the endless belt starts to mesh with the rack teeth, the previous end of the pressing member is first pulley or said second pulley 5 to 5 mm which do not interfere with each other and extend to a proximity range of 2 mm to 5 mm, and the tooth side portions are pressed against the rack teeth to forcibly mesh with each other. The belt-rack type driving device according to any one of the above. On both sides of the holding member along the longitudinal direction of the rack base, hanging side portions that are suspended from both sides of the rack base and surround the endless belt are integrally formed, and the endless belt is separated from the rack base. The belt-rack type driving device according to claim 9 , wherein the belt-rack type driving device is regulated so as not to be removed. The slider guide provided on the rack base is slidably mounted in the longitudinal direction, and the support plate is fixed to the slider.
A contact adjusting member comprising an upper and lower oblong hole formed in the support plate and an upper and lower screw passing through the upper and lower oblong hole is provided, and the upper and lower screw is changed by changing the vertical position of the support plate with respect to the upper and lower oblong hole 5. The contact degree of the first pulley and the second pulley with respect to the rack teeth can be adjusted by retightening the upper and lower elongated holes to the slider. The belt-rack type driving device according to any one of the above.   The belt rack type driving device according to any one of claims 1 to 4, wherein the rack base is formed by joining a plurality of single rack bases.

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