阅读说明：本技术 用于农业收割机的带轮组件 (Belt wheel assembly for agricultural harvester ) 是由 C·范德韦格 R·凡科利 于 2020-03-24 设计创作，主要内容包括：提供一种用于安装于农业收割机的可旋转轴上的带轮组件(10)并且所述带轮组件(10)可以高速构造或低速构造操作。所述带轮组件(10)包括高速带轮(16)以及低速带轮(18),所述高速带轮(16)具有用于在所述带轮组件(10)处于所述高速构造中时接收传动带(14)的高速运转表面(36),所述低速带轮(18)具有用于在所述带轮组件(10)处于所述低速构造中时接收传动带(15)的低速运转表面(62)。所述带轮组件(10)具有从所述两个带轮(16,18)的表面延伸的三组齿(68,50,52)。在所述低速构造中,所述低速带轮(18)和高速带轮(16)的运转表面(36,62)轴向地对准并且所述第一组齿(68)和所述第二组齿(50)接合。在所述高速构造中,所述高速带轮(16)的运转表面(36)暴露以接收所述传动带(14),而所述低速带轮(18)定位于所述高速带轮(16)的运转表面(36)旁边,并且所述第一组齿(68)和所述第三组齿(52)接合。可通过所述齿的分离、所述低速带轮(18)的沿着所述中心轴线的运动、以及所述齿的接合在所述高速构造与所述低速构造之间构造所述带轮组件(10)。(A pulley assembly (10) for mounting on a rotatable shaft of an agricultural harvester is provided and the pulley assembly (10) is operable in a high speed configuration or a low speed configuration. The pulley assembly (10) includes a high speed pulley (16) and a low speed pulley (18), the high speed pulley (16) having a high speed running surface (36) for receiving a drive belt (14) when the pulley assembly (10) is in the high speed configuration, the low speed pulley (18) having a low speed running surface (62) for receiving a drive belt (15) when the pulley assembly (10) is in the low speed configuration. The pulley assembly (10) has three sets of teeth (68, 50, 52) extending from the surfaces of the two pulleys (16, 18). In the low speed configuration, the running surfaces (36, 62) of the low and high speed pulleys (18, 16) are axially aligned and the first and second sets of teeth (68, 50) are engaged. In the high-speed configuration, the running surface (36) of the high-speed pulley (16) is exposed to receive the drive belt (14), while the low-speed pulley (18) is positioned alongside the running surface (36) of the high-speed pulley (16), and the first and third sets of teeth (68, 52) are engaged. The pulley assembly (10) may be configured between the high-speed configuration and the low-speed configuration by disengagement of the teeth, movement of the low-speed pulley (18) along the central axis, and engagement of the teeth.)

1. A pulley assembly (10) for mounting on a rotatable shaft of an agricultural harvester, the pulley assembly (10) being operable in a high speed configuration or a low speed configuration, the pulley assembly (10) comprising:

a high speed pulley (16), the high speed pulley (16) having a high speed running surface (36) for receiving a drive belt (14) when the pulley assembly (10) is in the high speed configuration, a mount (20) for mounting the high speed pulley (16) to the rotatable shaft for rotating the high speed pulley (16) about a central axis (A), and a storage surface (42);

a low-speed pulley (18), the low-speed pulley (18) having a low-speed running surface (62) for receiving a drive belt (15) when the pulley assembly (10) is in the low-speed configuration and a mounting surface (70) for mounting the low-speed pulley (18) to the high-speed pulley (16); and

three sets of teeth (68, 50, 52), each set of teeth (68, 50, 52) including at least one tooth extending radially from the mounting surface (70) toward the central axis (A) or radially from the storage surface (42) away from the central axis (A), and wherein a first set of teeth (68) of the three sets of teeth extends from a surface different from a second set of teeth (50) and a third set of teeth (52) of the three sets of teeth, wherein:

in the low-speed configuration, the running surfaces (36, 62) of the low-speed pulley (18) and high-speed pulley (16) are axially aligned and the first set of teeth (68) and the second set of teeth (50) are engaged;

in the high-speed configuration, the running surface (36) of the high-speed pulley (16) is exposed to receive the drive belt (14), the low-speed pulley (18) is positioned alongside the running surface (36) of the high-speed pulley (16) along the central axis (a), and the first and third sets of teeth (68, 52) are engaged; and

the pulley assembly (10) is configurable between the high-speed configuration and the low-speed configuration by disengagement of teeth, movement of the low-speed pulley (18) along the central axis, and engagement of teeth.

2. The pulley assembly (10) of claim 1, wherein each set of teeth (68, 50, 52) comprises more than one tooth, and wherein the more than one teeth are evenly spaced about the circumference of their respective surfaces.

3. The pulley assembly (10) of claim 2, wherein a distance between adjacent ones of each of said second and/or third sets of teeth (50, 52) is wider than a width of each of said first set of teeth (68) to allow passage of a tooth of said first set of teeth (68) between teeth of said second or third sets of teeth (50, 52) when said pulley assembly (10) is configured between said high and low speed configurations.

4. The pulley assembly (10) of claim 2 or claim 3, wherein each tooth of said second set of teeth (50) is aligned with a space between two teeth of said third set of teeth (52).

5. The pulley assembly (10) according to any preceding claim, wherein configuring the pulley assembly (10) between the high speed and low speed configurations is achievable by disengaging engaged teeth, rotating the low speed pulley (18) relative to the high speed pulley (16) and the central axis, moving the low speed pulley (18) relative to the high speed pulley (16) along the central axis, and engaging teeth.

6. The pulley assembly (10) according to any preceding claim, wherein each tooth of the first set of teeth (68) comprises at least one bolt hole for receiving a bolt, and wherein the bolt hole is positioned on a tooth of the first set of teeth to align with a respective bolt hole of the second and/or third set of teeth (50, 52).

7. The pulley assembly (10) according to claim 6, characterized in that said bolt holes are threaded.

8. The pulley assembly (10) according to any preceding claim, wherein the teeth of said first set of teeth (68) and the teeth of at least one of said second and third sets of teeth (50, 52) comprise mating ridges (60, 76), said mating ridges (60, 76) being positioned on the faces of the teeth such that when the sets of teeth (68, 50, 52) are engaged, the mating ridges (60, 76) of the engaged teeth are also engaged.

9. The pulley assembly (10) according to any preceding claim, wherein said first set of teeth (68) extends from said low speed pulley (18), and wherein said second and third sets of teeth (50, 52) extend from said high speed pulley (16).

10. The pulley assembly (10) of claim 9, said pulley assembly (10) comprising a removable other pulley (78), said removable other pulley (78) having a diameter greater than a diameter of said high speed pulley (16), said other pulley having:

a further running surface (80) for receiving the belt,

a second mounting surface (84) for mounting the other pulley to the high speed pulley (16), an

A fourth set of teeth (82) comprising at least one tooth, the at least one tooth of the fourth set of teeth extending radially from the second mounting surface (84) toward the central axis (A), wherein:

the fourth set of teeth (82) is configured to engage the second set of teeth (50) to align the running surfaces of the other and high speed pulleys (78, 16).

11. The pulley assembly (10) according to claim 10, characterized in that the diameter of said further pulley (78) is smaller than the diameter of said low-speed pulley (18).

12. The pulley assembly (100) of any of claims 1-8, wherein the first set of teeth (150) extend from the high speed pulley (116), and wherein the second and third sets of teeth (152, 168) extend from the low speed pulley (118).

13. An agricultural harvester comprising a pulley assembly (10) as claimed in any preceding claim.

14. An agricultural harvester according to claim 13, wherein the agricultural harvester is a combine harvester comprising a feed section, a threshing section, and a feed roller for conveying harvester crop from the feed section towards the threshing section, the pulley assembly (10) being mounted to a rotatable shaft of the feed roller.

15. A method of configuring a pulley assembly (10) according to any one of claims 1 to 12 from a high speed configuration to a low speed configuration or from a low speed configuration to a high speed configuration, the method comprising:

separating the first set of teeth (68) from one of the second or third sets of teeth (50, 52);

rotating the low-speed pulley (18) relative to the high-speed pulley (16);

moving the low-speed pulley (18) relative to the high-speed pulley (16) along the central axis; and

engaging the first set of teeth (68) to the other of the second or third sets of teeth (50, 52).

16. The method of claim 15, wherein the teeth are evenly spaced about the circumference of their respective surfaces such that a space is formed between adjacent teeth, and wherein the distance between adjacent teeth in each of the second and/or third sets of teeth (50, 52) is wider than the width of each tooth in the first set of teeth (68), and wherein rotating the low speed pulley (18) relative to the high speed pulley (16) comprises rotating the low speed pulley (18) to align each tooth in the first set of teeth (68) with a space, and wherein moving the low speed pulley (18) comprises moving the teeth in the first set of teeth (68) through the space.

17. The method according to claim 15 or claim 16, wherein rotating the low-speed pulley (18) relative to the high-speed pulley (16) is performed at least twice.

18. The method according to claim 17, wherein rotating the low-speed pulley (18) relative to the high-speed pulley (16) is performed three times, and wherein moving the low-speed pulley (18) relative to the high-speed pulley (16) along the central axis is performed two times.

Technical Field

The present disclosure relates to a pulley assembly for an agricultural harvester.

Background

Agricultural harvesters, such as combine harvesters, are multi-purpose machines used to harvest crops. Users often have a harvester for harvesting a variety of different crops. Crop requirements and user desires to operate the harvester vary depending on crop type, weather conditions, and other variables, and thus many agricultural harvesters are highly configurable to enable adaptation to different crop and user requirements.

One specific example of how a harvester can be configured for different crops is the rotational speed of the feed rollers of a combine harvester. The combine harvester comprises a feeding section and a threshing section. The feed rollers convey the harvested crop from the feed section towards the threshing section. For small grain crops, high yields are desired to provide crop acceleration, so the feed rollers should be operated at relatively high speeds. For corn and legumes, the feed rollers should be operated at a relatively low speed to avoid grain damage.

To achieve speed variability, a conventional solution is to provide a pulley with high and low speed running surfaces to transmit power to the feed roller, the high speed running surface having a smaller diameter than the low speed running surface. To change the speed, the user must remove the pulley from its shaft, invert the pulley to properly position the correct running surface, and reattach the pulley to the shaft. This requires a lot of work, especially considering that the pulleys are usually large and heavy.

In addition, the pulley is typically located behind the large non-steered front wheels of the harvester. The gap between the wheel and the pulley is usually too small to allow removal of only the pulley, and instead the cumbersome, inconvenient task of removing the front wheel must be performed to allow removal of the pulley and change the speed of the feed roller.

It is an object of the present invention to address one or more of the disadvantages associated with the prior art.

Disclosure of Invention

According to one aspect of the present invention, there is provided a pulley assembly for mounting on a rotatable shaft of an agricultural harvester, the pulley assembly being operable in a high speed configuration or a low speed configuration. The pulley assembly includes: a high speed pulley having a high speed running surface for receiving a drive belt when the pulley assembly is in the high speed configuration, a mount for mounting the high speed pulley to the rotatable shaft for rotation of the high speed pulley about a central axis, and a storage surface; a low-speed pulley having a low-speed running surface for receiving a drive belt when the pulley assembly is in the low-speed configuration and a mounting surface for mounting the low-speed pulley to the high-speed pulley; and three sets of teeth, each set of teeth including at least one tooth extending radially from the mounting surface toward the central axis or from the storage surface away from the central axis, and wherein a first set of the three sets of teeth extends from a different surface than a second set of teeth and a third set of teeth of the three sets of teeth. When in the low speed configuration, the running surfaces of the low and high speed pulleys are axially aligned and the first and second sets of teeth are engaged. In the high speed configuration, the running surface of the high speed pulley is exposed to receive the drive belt, the low speed pulley is positioned alongside the running surface of the high speed pulley along the central axis, and the first and third sets of teeth are engaged. The pulley assembly may be configured between the high-speed configuration and the low-speed configuration by disengagement of the teeth, movement of the low-speed pulley along the central axis, and engagement of the teeth.

The pulley assembly advantageously reduces the time and effort required to alternate between a high speed configuration and a low speed configuration. The conventional art requires the entire pulley assembly to be removed from the shaft on which it is mounted, but the above-described pulley assembly can be switched between configurations without being removed from the shaft. Thus, there is less risk of damaging the components of the harvester and there is no risk of incorrectly reinstalling the components to the harvester. In particular, the pulley assembly is maintained at the same position on the shaft, and therefore the low and high speed pulleys can be correctly positioned each time, whereas a previous speed change may result in an incorrect positioning of the pulley assembly.

Furthermore, the ability to reconfigure the pulley assembly allows for a combination of different sized low and high speed pulleys to be easier than has traditionally been possible. To obtain a new speed with a conventional pulley, a new pulley assembly must be purchased. The above-described pulley assembly allows for the size of the low and high speed pulleys to be changed without having to replace the entire pulley assembly.

The first set of teeth may extend from the low-speed pulley and the second and third sets of teeth may extend from the high-speed pulley. Alternatively, the first set of teeth may extend from the high speed pulley and the second and third sets of teeth may extend from the low speed pulley.

Each set of teeth may include more than one tooth. The teeth may be evenly spaced around the circumference of their respective surfaces.

The distance between adjacent teeth of each of the second and/or third sets of teeth may be wider than the width of each tooth of the first set of teeth, thereby allowing the teeth of the first set of teeth to pass between the teeth of the second or third sets of teeth when the pulley assembly is configured between the high and low speed configurations. It is useful that the spacing between adjacent teeth is wider than the first set of teeth, ensuring that the movement of the high and low speed pulleys relative to each other is as direct as possible.

Each tooth of the second set of teeth may be aligned with a space between two teeth of the third set of teeth. Aligning the spaces between the teeth of the second set and the teeth of the third set advantageously limits movement of the first set of teeth relative to the second and third sets of teeth. For example, when the first set of teeth passes through the space between the third set of teeth during movement of the low speed pulley, the second set of teeth is then aligned with the first set of teeth and movement of the low speed pulley is limited by interference between the first and second sets of teeth. Restricting the movement of the teeth in this manner reduces the likelihood of moving the pulley too quickly and removing it completely.

The configuration of the pulley assembly between the high speed and low speed configurations may be achieved by disengaging the engaged teeth, rotating the low speed pulley relative to the high speed pulley and the central axis, moving the low speed pulley relative to the high speed pulley along the central axis, and engaging the teeth.

Each tooth may include at least one bolt hole for receiving a bolt. The bolt holes may be positioned on the teeth to align with corresponding bolt holes of the second and/or third sets of teeth. The bolt holes may be threaded. Each of these measures improves the engagement between the teeth.

The teeth of the first set of teeth and the teeth of at least one of the second and third sets of teeth may include mating ridges. The mating ridges may be positioned on the faces of the teeth such that when the sets of teeth are engaged, the mating ridges of the engaged teeth are also engaged. The mating ridges improve the engagement between the teeth.

The pulley assembly may include another pulley having a diameter greater than a diameter of the high speed pulley. The other pulley may have: a further running surface for receiving a drive belt, a second mounting surface for mounting the further pulley to the high speed pulley, and a fourth set of teeth comprising at least one tooth extending radially from the second mounting surface toward the central axis. The fourth set of teeth may be configured to engage one of the first three sets of teeth to align the running surfaces of the other pulley and the high speed pulley.

As demonstrated, the above arrangement allows the inclusion of a further third pulley in addition to the low and high speed pulleys without the need to remove the low speed pulley. While the further pulley may require removal of the front wheel if the pulley assembly is located behind the front wheel of the harvester, the further pulley advantageously allows for a greater variety of speeds without having to replace the entire pulley assembly.

The diameter of the other pulley may be smaller than the diameter of the low-speed pulley. The diameter of the other pulley may be larger than the diameter of the low-speed pulley.

According to another aspect of the invention, there is provided an agricultural harvester comprising the pulley assembly described above.

The agricultural harvester may be a combine harvester comprising a feed section, a threshing section, and feed rollers for conveying harvester crop from the feed section towards the threshing section. The pulley assembly may be mounted to a rotatable shaft of the feed roller.

According to another aspect of the present invention, a method of configuring the above-described pulley assembly from the high speed configuration to the low speed configuration or from the low speed configuration to the high speed configuration is provided. The method comprises the following steps: separating the first set of teeth from one of the second or third sets of teeth; rotating the low-speed pulley relative to the high-speed pulley; moving the low-speed pulley relative to the high-speed pulley along the central axis; and engaging the first set of teeth to the other of the second or third sets of teeth.

Wherein the teeth of the pulley assembly are evenly spaced about the circumference of their respective surfaces such that a space is formed between adjacent teeth and the distance between adjacent teeth of each of the second and/or third sets of teeth is wider than the width of each of the first set of teeth, rotating the low speed pulley relative to the high speed pulley may include rotating the low speed pulley to align each of the first set of teeth with a space, and/or moving the low speed pulley may include moving the teeth of the first set of teeth through the space.

Rotating the low-speed pulley relative to the high-speed pulley may be performed at least twice.

Rotating the low-speed pulley relative to the high-speed pulley may be performed three times. Moving the low-speed pulley relative to the high-speed pulley along the central axis may be performed twice.

Within the scope of the present application, it is expressly intended that the various aspects, embodiments, examples, and alternatives set forth in the preceding paragraphs, claims, and/or in the following description and drawings, and in particular the various features thereof, may be employed independently or in any useful combination.

Drawings

One or more embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

fig. 1 shows a perspective view of a pulley assembly in a high speed configuration in accordance with an embodiment of the present invention;

fig. 2 shows a front view of the pulley assembly of fig. 1 in a high speed configuration;

FIG. 3 shows a cross-sectional view of the pulley assembly of FIG. 1 in a high speed configuration;

FIG. 4 shows a perspective view of the pulley assembly of FIG. 1 in a low speed configuration;

FIG. 5 shows a front view of the pulley assembly of FIG. 1 in a low speed configuration;

FIG. 6 shows a cross-sectional view of the pulley assembly of FIG. 1 in a low speed configuration;

fig. 7 shows a cross-sectional view of the pulley assembly of fig. 1 in another configuration;

fig. 8 shows a perspective view of a pulley assembly in a high speed configuration according to another embodiment of the present invention;

fig. 9 shows a cross-sectional view of the pulley assembly of fig. 8 in a high speed configuration; and

fig. 10 shows a cross-sectional view of the pulley assembly of fig. 8 in a low speed configuration.

Detailed Description

In general, the present invention relates to a pulley assembly for use on an agricultural harvester that can be configured in high and low speed configurations. As described below, the pulley assembly is particularly suitable for use with the feed roller of a combine harvester, but such a pulley assembly provides advantages when mounted on any rotatable shaft of an agricultural harvester requiring more than one rotational speed.

A pulley assembly 10 according to one embodiment of the present invention is depicted in fig. 1-6. The pulley assembly 10 may be configured in a high speed configuration and a low speed configuration for transmitting torque between the drive belt and the shaft. The pulley assembly 10 rotates at a slower speed in the low speed configuration than when it is in the high speed configuration. Fig. 1-3 show respective perspective, front and cross-sectional views of the pulley assembly 10 in a high speed configuration. Fig. 4 to 6 show respective perspective, front and cross-sectional views of the pulley assembly 10 in a low speed configuration. Fig. 3 and 6 are half cross-sectional views of the pulley assembly 10 in the high speed and low speed configurations, respectively; the pulley assembly 10 and the shaft 12 are rotationally symmetric about their central axis a.

In each of fig. 1 to 6, a pulley assembly 10 is mounted to a rotatable shaft 12 of an agricultural harvester (not shown). When torque is applied to the assembly 10 or the shaft 12, the pulley assembly 10 and the shaft 12 rotate together about the central axis a. It is contemplated that the shaft is connected to a feed roller of the combine, sometimes referred to as a dynamic feed roller, but the pulley assembly 10 may be mounted on a standard feed roller or any other rotatable shaft of an agricultural harvester for transmitting torque to or from the shaft.

In each of the high and low speed configurations, a respective drive belt 14, 15 is engaged with the pulley assembly 10. In use, movement of the drive belts 14, 15 transmits torque to the pulley assembly 10, which rotates the pulley assembly 10 about the central axis a and in turn rotates the shaft 12. The speed change between the high speed and low speed configurations of the pulley assembly 10 is achieved by changing the effective circumference of the pulley assembly 10. Thus, different belts 14, 15 are used for different speed configurations to account for differences in circumference. Alternatively, the belt tensioner may be used to compensate for variations in the effective circumference of the pulley assembly 10 in different configurations without having to change the belt.

Referring to fig. 1-6, the pulley assembly 10 includes a high speed pulley 16 and a low speed pulley 18. In each configuration, the pulleys 16, 18 are connected together and rotate together as a single entity when torque is applied to either of them. The manner in which the pulleys 16, 18 of the pulley assembly 10 engage and connect with one another and the relative positioning of the pulleys defines the configuration of the pulley assembly 10, as will be described in detail later.

The high speed pulley 16 includes a mounting portion 20 for mounting the pulley assembly 10 to the shaft 12. The mounting portion 20 includes a central bore 22 for receiving the shaft 12 therein and a mounting mechanism 24 for securing the shaft 12 in position within the bore 22 to couple the pulley assembly 10 and the shaft 12 together. The mounting mechanism 24 may be, for example, a bolt that couples the shaft to the front surface of the pulley 16 along the central axis, a clamp that surrounds the shaft, or some threaded arrangement.

The high speed pulley 16 further includes a run portion 26 and a storage portion 28. The running and storage portions 26, 28 are annular and are aligned with each other so as to be axially aligned on the central axis a and adjacent to each other along the central axis a. The run and storage portions 26, 28 each surround the mounting portion 20 and are connected to the mounting portion 20 by a connecting flange 30. The connecting flange 30 is connected to an inner surface 32, 34 of each of the running and storage sections 26, 28 in the region closest to the edges of the sections 26, 28 that abut against each other. The connecting flange 30 also connects the portions 26, 28 together. The running portion 26 has a high speed running surface 36 for engaging the high speed drive belt 14 when the pulley assembly 10 is in a high speed configuration. The high speed running surface 36 is the outer surface of the annular running portion 26. As can best be seen in fig. 3, the high speed running surface 36 has protruding teeth 38, the teeth 38 cooperating with grooves 40 in the drive belt 14 to improve the transmission of power.

The storage portion 28 includes a storage surface 42 on an exterior thereof and a plurality of teeth 44 extending radially away from the storage surface 42 and radially away from the central axis a of the pulley assembly 10. The teeth 44 are projections having front and rear surfaces 46, 48, the front and rear surfaces 46, 48 being substantially perpendicular to the storage surface 42 and parallel to each other. The front surface 46 of the tooth 44 faces the run portion 26.

The plurality of teeth 44 are divided into a first set of teeth 50 and a second set of teeth 52. The front surface 46 of each tooth of the first set of teeth 50 is aligned with the edge of the storage surface 42 closest to the run portion 26. The rear surface 48 of each tooth of the second set of teeth 52 is aligned with the other edge of the storage surface 42. Each of the first and second sets of teeth 50, 52 comprises six teeth evenly spaced about the circumference of the storage portion 28. The number of teeth in the first set of teeth 50 is equal to the number of teeth in the second set of teeth 52, in which case there are six teeth in each set, but in other embodiments there may be a different number of teeth in each set, and/or the number of teeth in a set may be one or more. The equal spacing of the teeth about their respective circumferences is such that spaces 53, 54 are defined between adjacent teeth in each respective set. The spaces between the teeth of the first set 50 are labeled 53 and the spaces between the teeth of the second set 52 are labeled 54.

The sets of teeth 50, 52 are angularly offset relative to each other. As best seen in the front view of the pulley assembly in fig. 2 and 5, the teeth of the first set of teeth 50 are arranged to be aligned with the center of the spaces 54 between the teeth of the second set of teeth 52, and vice versa. In other words, when considered together, the teeth of the first and second sets 50, 52 are evenly spaced circumferentially relative to one another, except that the teeth of each set are evenly spaced circumferentially. This arrangement of teeth provides operational advantages by making it easier to switch between configurations, as will be described in more detail below.

The teeth of the first and second sets of teeth have different heights, and the teeth of the first set of teeth are approximately half the height of the teeth of the second set of teeth.

In use, the purpose of the teeth is to engage with teeth in a third set of teeth located on the low speed pulley 18 in order to connect the pulleys 16, 18 together for unitary rotation of the pulley assembly 10. Thus, each set of teeth 50, 52 includes an engagement mechanism for engaging the low-speed pulley 18. In the embodiment shown in fig. 1-6, the engagement mechanism of each tooth of the first set of teeth 50 includes a bolt hole 56 for receiving a bolt therethrough. The engagement mechanism of each tooth of the second set of teeth 52 includes a bolt hole 58 for receiving a bolt therethrough and a ridge 60 configured to mate with a corresponding ridge in the low-speed pulley 18. Bolt holes 56, 58 extend from the front face 46, 48 to the rear face of each tooth. A ridge 60 is positioned on the rear face 48 of each tooth. The bolt holes 56 and 58 can be considered to be located on a circumference through all bolt holes 56, 58 in the same set of teeth. The bolt holes 56, 58 are located on different circumferences as the sets of teeth are at different heights.

Still referring to fig. 1-6, the low-speed pulley 18 is an annular member having an inner diameter greater than the outer diameter of the high-speed pulley 16 such that the low-speed pulley 18 surrounds the high-speed pulley 16. The outer surface of the low-speed pulley 18 is a low-speed running surface 62 for engagement with the low-speed drive belt 15 when the pulley assembly 10 is in the low-speed configuration. The low speed running surface 62 has protruding teeth 64, which teeth 64 cooperate with grooves 66 in the drive belt 15 to improve the transmission of power and avoid slipping.

As described above, the plurality of teeth forming the third set of teeth 68 extend radially from the inner surface 70 or mounting surface of the low-speed pulley 18 toward the central axis a. The teeth 68 have a front surface facing the high speed running surface 36 and a rear surface facing away from the high speed running surface 36. The teeth of the third set of teeth 68 are evenly spaced around the inner circumference of the low-speed pulley 18, and the rear surface of each tooth is disposed at the edge of the inner surface 70. The edge of each tooth is aligned with the edge of the inner surface 70 so that the teeth do not extend beyond the width of the running surface of the low-speed pulley 18. The number of teeth in the third set 68 matches the number of teeth in the first and second sets of teeth 50, 52. In the embodiment of fig. 1-6, each of the first, second, and third sets of teeth 50, 52, 68 has six teeth.

The teeth in the third set of teeth 68 (which have a height substantially similar to the second set of teeth 52) each include two bolt holes 72, 74. One 72 of the two bolt holes in each tooth is located on the same circumference as the bolt holes 58 in the second set of teeth 52 and the other 74 is located on the same circumference as the bolt holes 56 in the first set of teeth 50. As a result, when the third set of teeth 68 is aligned with either the first or second set of teeth 50, 52, one of the two bolt holes 72, 74 in each of the third set of teeth is aligned with the bolt holes 56, 58 in the teeth of either the first or second set of teeth 50, 52. Bolts (not shown) pass through the two aligned bolt holes to secure the aligned teeth together. The teeth of the third set 68 also include ridges 76 at their front faces for mating with the ridges 60 in each of the teeth of the second set 52. The ridges increase friction between the teeth, thereby improving engagement and maintaining the low speed pulley in a stored position in preparation for the bolts passing through the aligned bolt holes.

It should be understood that in some embodiments, the third set of teeth may have only one bolt hole and that the bolt holes are aligned with the bolt holes in the teeth of the first and second sets of teeth.

In use, the third set of teeth 68 is configured to engage the first and second sets of teeth 50, 52 when the pulley assembly 10 is in its low and high speed configurations, respectively.

Focusing first on the high speed configuration of the pulley assembly 10 as shown in fig. 1-3, the drive belt 14 is engaged with the running surface 36 of the high speed pulley 16. The low-speed pulley 18 is positioned to surround the storage portion 28 of the high-speed pulley 16, and is therefore said to be in the storage position. In the storage position, the low speed pulley 18 does not overlap the running surface 36 of the high speed pulley 16. The running surface 36 of the high speed pulley 16 is exposed to allow the drive belt 14 to fully engage the high speed running surface 36 without interference.

The second and third sets of teeth 52, 68 are engaged when the low-speed pulley 18 is in the storage position. In particular, the front face of each tooth of the third set of teeth 68 engages the rear face of one tooth of the second set of teeth 52. The bolt holes 58 of the second set of teeth 52 are aligned with the bolt holes 72 of the third set of teeth 68 on the same circumference. The mating ridges 60, 76 of the teeth of each set are aligned and the third and second sets of teeth 68, 52 are held in place by bolts passing through the aligned bolt holes 58, 72. For clarity, the bolts are not shown in these figures.

Different arrangements of the teeth or sets of teeth on the storage surface 42 of the high speed pulley and the inner surface 70 of the low speed pulley can form different configurations of the pulley assembly with the same effect as the described embodiment. The specific arrangement of the present embodiment is provided in order to maintain a compact profile. However, other arrangements may be configured to further increase the strength of the connection, to reduce the overall weight of the pulley assembly, or to increase the ease of changeover between configurations, and thus may have different arrangements of teeth or sets of teeth.

When a user desires to operate the feed roller at a low speed, the pulley assembly 10 is switched from its high speed configuration to its low speed configuration. As already noted, fig. 4 to 6 show the pulley assembly 10 when the pulley assembly 10 is configured in the low speed configuration. The low speed configuration will be discussed first and then how the reconfiguration of the pulley assembly 10 is achieved.

In the low speed configuration, the low speed drive belt 15 is engaged with the low speed pulley 18, and rotation of the low speed pulley 18 caused by the drive belt 15 is transmitted to the high speed pulley 16, which in turn rotates the shaft 12. In the low speed configuration, the low speed pulley 18 is positioned in an active position wherein the running surfaces 36, 62 of the low and high speed pulleys 18, 16 are aligned, i.e., the running surfaces 36, 62 have the same axial position relative to the shaft 12 and the central axis a. Because the running surfaces 36, 62 have the same width, the edges of each running surface 36, 62 lie in the same plane.

To establish a connection between the low-speed pulley 18 and the high-speed pulley 16 to enable the pulley assembly 10 to function properly in the low-speed configuration and maintain the low-speed pulley 18 in an active position, the first set of teeth 50 on the high-speed pulley 16 and the third set of teeth 68 on the low-speed pulley 18 are engaged. Specifically, the rear faces of the teeth in the third set of teeth 68 engage the front faces of the teeth in the first set of teeth 50.

The associated bolt holes 74 of the third set of teeth 68 are aligned with the bolt holes 56 of the first set of teeth 50 and the pulleys 16, 18 are secured together by passing a bolt through each pair of holes to secure the pulleys 16, 18 together. For clarity, the bolts are not shown in these figures.

To transition or reconfigure the pulley assembly 10 from the high speed configuration to the low speed configuration, the user removes the high speed drive belt 14 from the high speed running surface 36. The bolts extending through the aligned bolt holes 58, 72 of the second and third sets of teeth 52, 68 are removed so that the pulleys 16, 18 are not secured together.

The low-speed pulley 18 is then rotated about the central axis a and relative to the high-speed pulley 16 until the second and third sets of teeth 52, 68 do not overlap and each tooth of the third set of teeth 68 is aligned with one of the spaces 54 between the teeth of the second set of teeth 52. The low-speed pulley 18 is moved axially along the central axis a such that the third set of teeth 68 pass through the spaces 54 between the second set of teeth 52.

Because the spaces 54 between the first set of teeth 50 and the second set of teeth 52 are aligned, axial movement of the low-speed pulley 18 is limited by the first set of teeth 50.

The low-speed pulley 18 is again rotated so that the first set of teeth 50 and the third set of teeth 68 do not overlap and so that the low-speed pulley 18 can continue its axial movement by passing the teeth of the third set of teeth 68 through the spaces 53 between the teeth of the first set of teeth 50.

Once the third set of teeth 68 has passed through the spaces 53 between the teeth in the first set of teeth 50, the low speed pulley 18 is rotated until the first and third sets of teeth 50, 68 are aligned, and in particular until the bolt holes 56, 74 of the first and third sets of teeth 50, 68 are aligned. The bolts pass through the bolt holes 56, 74 and the low speed pulley 18 is secured in its active position and the pulley assembly 10 is in its low speed configuration. The low-speed drive belt 15 engages the running surface 62 of the low-speed pulley 18 so that the pulley assembly 10 can be operated in its low-speed configuration.

Fig. 7 shows the pulley assembly 10 in another configuration. In the configuration of fig. 7, the low-speed pulley 18 is positioned above the storage portion 28 of the high-speed pulley 16 and is therefore in its storage position. However, in contrast to the high speed configuration, the high speed drive belt 14 is not used and does not engage the high speed running surface 36. Instead, the other pulley 78 is positioned in the active position. The other pulley 78 has a running surface 80 and a set of teeth 82 extending radially toward its central axis a. The diameter of the other pulley 78 is different from the diameters of the high and low speed pulleys 16, 18 and thus different rotational speeds are achieved. In the embodiment of fig. 7, the other pulley 78 will rotate at a lower speed than the low speed pulley 18, but it should be understood that the other pulley 78 may have any diameter greater than the diameter of the high speed pulley 16. It should be appreciated that a different drive belt may also be required because the other pulley 78 has a different diameter than the high or low speed pulleys 16, 18.

The other pulley 78 is an annular member having a running surface 80 and an inner surface 84, and includes a fourth set of teeth 82, the fourth set of teeth 82 extending radially away from the mounting surface 84 toward the central axis a. The teeth of the fourth set of teeth 84 are configured to engage the first set of teeth 50 to maintain the other pulley 78 in an active position so that different speeds can be achieved.

In certain embodiments, the low-speed pulley 18 may be completely removed and replaced with another pulley 78.

An alternative embodiment of the pulley assembly 100 is shown in fig. 8 to 10. The pulley assembly 100 of fig. 8-10 may be configured in both a low speed and a high speed configuration. Fig. 8 and 9 are perspective and side views of the pulley assembly 100 in a high speed configuration, while fig. 10 is a side view of the pulley assembly 100 in a low speed configuration. The pulley assembly 100 includes a high speed pulley 116 and a low speed pulley 118, and is shown mounted on the shaft 12.

The pulley assembly 100 of fig. 8-10 differs from the pulley assembly 10 of fig. 1-6 in the positioning of the sets of teeth and how they are arranged to achieve different configurations.

In this embodiment, the high speed pulley 116 includes, in a manner similar to the pulley assembly 10 of the previous embodiment, a running portion 126 including a running surface 136 for receiving the drive belt 114, a mounting portion 120, a connecting flange 130, and a storage portion 128. From fig. 8 to 10, it should be noted that the storage portion 128 of the high speed pulley 116 is not as wide as the previous storage portion 28. The reason for this is that in this embodiment, only one set of teeth (hereinafter the first set of teeth 150) extends from the storage portion 128 of the high speed pulley 116, rather than both sets of teeth.

The low speed pulley 118, which is an annular member having an inner surface 170 and an outer running surface 162 for receiving a drive belt (not shown), has two sets of teeth extending therefrom toward the central axis a. As in the previous embodiment, the sets of teeth on the pulley with the two sets of teeth are referred to as the second set of teeth 152 and the third set of teeth 168. The teeth of the second set of teeth 152 and the third set of teeth 168 are positioned against opposing edges of the inner surface 170. In this embodiment, the second set of teeth 152 and the third set of teeth 168 are aligned. It should be understood that in other embodiments, the second and third sets may be offset.

A single bolt hole 156 is provided in each tooth. The bolt holes 156 in each tooth of the first set 150 are positioned to align with the bolt holes 156 of the teeth in the second and third sets 152, 168. In an alternative embodiment, each tooth of the first set may contain two bolt holes: one hole is for alignment with the bolt hole in the second set of teeth and the other hole is for alignment with the bolt hole in the third set of teeth.

In the high speed configuration, the high speed running surface 136 is exposed and is capable of receiving a drive belt. The low speed pulley 118 is positioned in its storage position with the first set of teeth 150 extending from the high speed pulley 116 engaged with the second set of teeth 152, the second set of teeth 152 extending from the low speed pulley 118 at the edge of the inner surface 170 closest to the high speed running surface 136.

In the low speed configuration, as shown in fig. 10, the third set of teeth 168 of the low speed pulley 118 engages the first set of teeth 150 of the high speed pulley 116 to align the running surfaces 136, 162 of the pulleys 116, 118 and to place the low speed pulley 118 in its active position. As shown in fig. 10, the second set of unengaged teeth 152 are seated over or against the edge of the high speed pulley 116.

To transition from the high speed configuration to the low speed configuration, the engaged first and second sets of teeth 150, 152 are disengaged, and the low speed pulley 118 is moved axially relative to the high speed pulley 116 such that the third set of teeth 168 contact the rear portion of the first set of teeth 150. The low-speed pulley 118 is rotated relative to the high-speed pulley 116 such that the teeth of the third set of teeth 168 are aligned with the spaces 153 between the teeth of the first set 150. The low-speed pulley 118 is again moved axially relative to the high-speed pulley 116 such that the third set of teeth 168 move between the teeth in the first set of teeth 150. The low-speed pulley 118 is again rotated so that the third set of teeth 168 and the first set of teeth 150 are aligned, and in particular so that their bolt holes 156 are aligned, and the teeth are engaged to secure the low-speed pulley 118 in its active position, whereby the pulley assembly 100 is in the low-speed configuration.

The embodiments of fig. 1-10 may generally be described as each having three sets of teeth, with a first set of teeth extending from one of the high and low speed pulleys and second and third sets of teeth extending from the other of the high and low speed pulleys. Thus, when considering the arrangement of the pulley in the high and low speed configurations, the first and second sets of teeth may be considered to be engaged at all times when the pulley assembly is in the low speed configuration, and the first and third sets of teeth may be considered to be engaged when the pulley assembly is in the high speed configuration, regardless of whether the high or low speed pulley contains both sets of teeth.

Many modifications may be made to the above-described embodiments without departing from the scope of the claims. For example, one set of teeth (which are arranged such that it does not have to pass through any other set of teeth during reconfiguration of the assembly) may be implemented as a single flange extending around the entire circumference of the pulley. The flange may contain bolt holes through the flange at regular intervals for engagement with the teeth of one of the other sets.

It is contemplated that the high speed pulley will rotate at 1100 rpm and the low speed pulley will rotate at 640 rpm. The other pulley may be dimensioned, for example, to reach 557 rpm.

It should be understood that various changes and modifications may be made to the invention without departing from the scope of the application.