KR950008091Y1 - Belt gringing assembly - Google Patents

Abstract

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Description

Belt Grinding Assembly

1 is a partial vertical front view of a belt polishing assembly according to the present invention, in which portions are cut to show in detail.

2 is a partial vertical side view of the belt polishing assembly according to the present invention.

3 is a partially enlarged vertical side view of the belt polishing assembly according to the present invention, in which portions are cut to show in detail.

4 is a partially enlarged sectional view taken along line 4-4 of FIG.

* Explanation of symbols for main parts of the drawings

10: abrasive assembly 12: wrench

14: soft surface 16: belt drive mechanism

17: polishing belt 22: support roller

23: support surface 28: wheel

35, 36: jaw 40: pivot pin

42: spring

The present invention relates to a belt polishing assembly adapted to be used to polish smooth arcs on edges extending between major sides on long bars such as wrenches, the edges being linear along the longitudinal direction of the bar or wrench. Has a predetermined shape that may not.

The belt polishing assembly is intended to polish a smooth arc on a soft surface that extends between an object such as a wrench or between major surfaces on a long bar, the soft surface being predetermined or non-linear along the longitudinal direction of the wrench when viewed in the plane of the major surface. It is known to have a shape. Such abrasive assemblies may be subjected to the original roughening, produced by a method in which the wrench is machined (e.g. drop forged) to form a smooth arc edge that is easier and more aesthetically pleasing with the wrench user's hand than the original rough or irregular edge. Useful for changing irregular soft surfaces. One such abrasive assembly comprises (1) a support roller having a uniform shape, which is fixed to the frame means for the assembly and which is straight in the conveying direction of the belt and limited in the shape of the edge surface limited in the direction perpendicular to the conveying direction of the belt. A belt polishing assembly having a drive mechanism for driving the polishing belt in a first direction along a path that passes; (2) an assembly consisting of bar operation means for moving the edge of the bar along the arcuate path perpendicular to the conveying direction of the belt to engage the abrasive coated surface of the belt along the support surface to form a radius on the bar; Include. In this known belt polishing assembly, the bar operating means is a metal slat extending laterally between two endless roller chains which are spaced parallel to each other and the chain link facing each other and the slat facing the longitudinal direction of the chain. For belts with conveyors having a conveyor belt formed by a receiving portion for the bar attached to the slats on the sides of the belt and two parallel spaced shafts each supporting two axially spaced sprockets around which the chain is tensioned Provided by the drive mechanism. Each receptacle is adapted to receive one of the bars therein, the length of the bar extending parallel to the slat and the end face of the bar protruding from the slat, at one end of the conveyor the sprocket at one of the receptacles around the sprocket on one axis. One is arranged to move the bar in the arc-shaped receptacle along the support surface in pressure engagement with the polishing belt to polish the semicircular portion on the edge surface of the bar.

Another abrasive assembly comprises: (1) a belt polishing assembly having a drive mechanism for driving the polishing belt in a first direction along a path through the polishing zone; A bar manipulation means for moving in pressure engagement with the abrasive coated surface of the belt in the polishing portion along an arcuate path about an axis perpendicular to the conveying direction, the bar manipulation means comprising: a drum having a bar receiving portion attached thereto; It is provided by the chain drive mechanism for the drum. Each receptacle is adapted to receive one of the bars therein, the length of the bar extending parallel to the axis of the drum and the edge of the bar protruding from the slat, the drum being arcuated by movement of one of the receptacles around it. The bar of the receiving portion is moved to press-bond with the polishing belt along the supporting surface so as to polish the semi-circular portion on the edge surface of the bar.

The abrasive assemblies can polish a semicircular portion on the side of a bar or wrench, but there are several problems.

In the holder or chain drive between the sprocket and the conveyor belt, the bar is loosened and the bar is not moved momentarily by the drive mechanism as the bar is first engaged with the polishing belt along the support surface and then the drive mechanism is The bar is disposed along the support surface such that the bar is moved along with the belt and the looseness causes the bar to move with the belt, which causes the bar to move so that the engagement with the belt along the support surface is released too quickly. As a result of this engagement between the bar and the belt, there is a polished portion on the non-uniform bar where too much metal is removed from the portion of the bar that initially engages the belt and too little metal is removed from the portion of the bar that is finally joined to the belt. Will be. In addition, the bar or wrench may fall without the holder as the engagement with the belt is released, which may cause a danger.

An object of the present invention is a belt polishing assembly that extends between major sides on a long bar, such as a wrench, and is capable of grinding a uniformly curved edge surface that may or may not be linear along the length of the bar or wrench. To provide.

The belt drive assembly according to the present invention is (1) a means for driving the polishing belt in a first direction along the path to the continuous polishing belt and the frame and a straight line in the first direction adjacent to the back of the belt and along the path; This support surface, which has a uniform shape corresponding to the shape of the soft surface in the direction perpendicular to the first direction, has a support surface and has a supporting roller fixed to the frame, is a belt polishing mechanism and (2) the soft surface of the bar. And a bar operating means for moving the pressure contact with the polishing belt along the support surface at a uniform speed along an arcuate path around an axis perpendicular to the first direction. The bar operating means comprise jaws and means for mounting the wheels on the frame to rotate about an axis perpendicular to the first direction to in turn move the wheels around the wheels after passing the load relative to the frame and then through the support surface. A clamp comprising a spaced jaw mounted on the periphery of the wheel to allow relative movement between a release position in which the jaws are spaced so as to freely receive the bar between the coupling position and an engagement position in which the bar is securely held between the jaws. And jaw actuating means for moving the jaw from the means and the release position to the load zone and placing the jaw in the engaged position as the clamp assembly is moved past the support surface.

The pressure movement of the bar's edge along the arcuate path with the abrasive belt at constant speed comprises a drive means having a helical gear coaxial with the wheel and having a diameter within 25 cm (10 inches) of the diameter of the wheel, and a helical gear. Drive worm gears, which are in mesh with and perpendicular to the axis of the helical gears, and means for mounting the worm gears to move radially relative to the helical gears, and worms to engage with the helical gears to limit the backlash between the gears. It is facilitated by means of pressure adjusting the teeth of the gear.

The jaw also includes a first jaw detachably attached around the wheel in the fixed position and a second jaw mounted on the wheel to pivot about the first jaw between the release and engagement positions, and the jaw actuation The means comprises a cam means having a cam and a tappet mounted on the second jaw for moving the spring between the wheel and the jaw for pressure adjustment of the second jaw to the engagement position and the second jaw with a release switch, the clamp means A plurality of pairs of separation jaws mounted spaced around the wheel, each pair of which is mounted on the wheel so as to move relative between the release and engagement positions, and the jaw actuating means are adapted to As the jaw is moved to the release position and the clamp assembly is moved past the support surface, the jaws are placed in their mating positions and the wheels are secured so that the finished bar or wrench can fall into the container. Gakssang the jaws is moved to a release position in a subsequent couple and is located on the frame along.

The drawing shows an initial edge surface 14 having a predetermined shape when viewed in the plane of the principal side, which is located between the opposite major sides and the sides and which may pass through and may not be linear along the longitudinal direction of the wrench 12. A belt polishing assembly 10 is shown that is intended to be used on a long bar, such as a wrench 12, which is shown to be shown. The abrasive assembly 10 is adapted to polish the wrench 12 to form a new soft surface that extends between the sides and maintains a predetermined shape along the longitudinal direction of the wrench 12 and is smoothly curved.

In general, the belt polishing assembly 10 has a flexible fabric lining having front and rear surfaces 18 and 19 and abrasive particles adhered along the entire surface 18 (for example, a resin trademarked as "Three-M-ite"). Conventional belt drive mechanism (not shown) having a conventional continuous abrasive belt 17 having an adhesive woven belt and a polishing belt sold by 3M Company of St. Paul, Minn., And a spaced roller in which the abrasive belt is tensioned around it. Motor driving assembly configured to drive the polishing belt 17 in the first direction along a path to the frame means for the assembly 10 of the type and to drive the polishing belt 17 by driving a roller. Belt drive mechanisms, including, for example, vertical slack belt machines sold by KLK Industries of Crystal, Minnesota, or G & P Industries, Indianapolis, Indiana; A support surface 23 is provided along a path adjacent to the rear surface 19, and the support surface 23 is a straight line in the first direction in which the polishing belt 17 is driven (see FIGS. 2 and 3) and the polishing belt is straight. A belt driving mechanism 16 composed of a support roller 22 having a uniform shape corresponding to the shape of the edge surface 14 in the direction perpendicular to the first direction in which the 17 is driven (see also FIG. 4); ; The edge surface of the wrench 12 at a constant speed along an arcuate path around an axis 26 perpendicular to the first direction in which the polishing belt 17 is driven to press-fit with the polishing belt 17 along the support surface 23. And bar operation means for moving (14).

The bar operating means or mechanism comprises a wheel 28 with an axis 26 and a generally cylindrical circumference 27 and a support of the roller 22 after the abrasive belt 17 passes the load zone 33 against the frame means. To a bearing 30 which mounts the wheel on the frame means to rotate about an axis 26 perpendicular to the first direction which is driven to in turn move the circumference 27 of the wheel 28 over the face 23. Means in the form of an axle 29 for the wheel 28 to be supported by the journal, drive means for rotating the circumference 27 of the wheel 28 past the support surface 23 of the roller 22 at a uniform rotational speed, The wrench between the jaws (35, 36) and the release position (see jaws (35, 36 in the load zone 33)) spaced apart so that the jaws (35, 36) freely receive the wrench (12) therebetween. On the wheels 28 spaced apart around the periphery 27 for relative movement between the engaging positions (see the jaws adjacent to the rollers 22) which are intended to hold the 12 firmly. The clamp means having the first and second spaced jaws 35, 36 in the fitted pair and the jaws 35, 36 are placed in the release position of the load station 33 and each clamp assembly supports the roller 22. It consists of jaw actuating means (to be described later) for positioning the jaws 35 and 36 in the engaged position as they move past the face 23.

In each pair of jaws 35, 36, the first or fixed jaw 35 is releasably attached to the outer circumference 27 of the wheel 28 in a fixed position by means to be described below and the second or motion The jaw 36 is mounted on the wheel 28 by means comprising a fixed pin 35 between the release position and the engaging position and a pivot pin 40 which pivots about the wheel 28; The jaw actuation means comprises a spring 42 for biasing the stationary jaw 35 and the actuating jaw 36, the cam means being actuated to rotate about an axis parallel to the axis of the wheel 28. A cylindrical tappet 43 mounted, wherein the first and second cams 45 and 46 are mounted to the frame means so that the finished wrench 12 can fall into the receptacle in the unloaded station 48. A pair of jaws 35, 36 are in the load station 33 in front of the roller 22 or in the unloaded station 48 behind the roller 22 and are secured to the frame means along the lowermost part of the wheel 28. And when the pair of jaws 35, 36 are moved and pass through the unloaded station after the movement from the load station 33 through the support surface 23 of the roller 22, the caps 45, 46 are It has a cam surface arranged for engaging by a cam tab 43 to the movable jaw 36 at the disengaged position of (35, 36).

As shown in detail in FIG. 4, each pair of jaws 35, 36 is shaped to place the wrench 12 in a predetermined position between these jaws. That is, here a pin 49 is received between the jaws of the wrench 12 and a pin 49 for supporting the edge surface 14, which is radiused by the grinding assembly 10. Thus differently shaped jaws 35 and 36 may be required for differently shaped wrenches, and the use of such shaped jaws is facilitated by means of releasable coupling to the calibrated jaw 35 described below. Done.

As shown in detail in FIG. 3, the means for changing the secondary contact portion of the actuating jaw 36 shaped to engage with a special wrench or other bar may be pivotally mounted on the pivot pin 40. 53, which has an actuating jaw 36, the main part 53 of which is equipped with a cam tabbit 43, the main part 53 of which protrudes substantially in the center radial direction of the wheel 28 and pivotable support pins. Has 54. On pivotable support pin 54 a secondary actuation jaw 36 of actuation jaw 36 is pivotally mounted.

The pivotal movement of the secondary contact of the actuating jaw 36 around the pin 54 ensures complete contact of the actuating jaw 36 with the wrench 12 between the jaws 35, 36. The secondary contact of the actuating jaw 36 is on the leaf spring 54 with the end portion fixed on the main part 53 of the actuating jaw 36 and on the secondary contact 52 of the actuating jaw 36. It is held in position on the pin 54 relative to the main part by moving the lug 57 over the tip end used to engage over the lip.

If necessary, the contact portion 52 draws the lug 57 into the recess in the contact portion 52 of the actuation jaw 36 for the convenience of the spring 56 and the contact portion 52 of the pin 54. Raise the contact and place the new contact on the pin 54 and the lug 57 into the recess in the new contact so that it is held in place under the influence of the spring 56 and the contact of the other shape. Is easily replaced.

The means for releasably attaching the first or fixed jaw 35 of each jaw pair to the circumference 27 of the wheel 28 comprises structural means in the form of spaced metal bars 60. This rescue means is used with the cylindrical outer portion of the wheel 28 to form a slot attached transversely along the circumference 27 of the wheel 28 and extending generally parallel to the axis of the wheel 28. It has a retraction opening at the end of the slot shown in 3 degrees. The fixed jaw 35 fits tightly into the slot and includes a lever 63 pivotable in a position protruding across the open end of the slot at a position spaced from the open end of the fixed jaw 35 in the slot. It is provided to fix the base 62 of the. The bars 60, 61, which form at least one side and preferably the side of the slot, are disposed at an acute angle with respect to the outer surface of the cylindrical portion of the wheel 28. Means for detachably retaining the base 62 in the slot may be on one or both sides of the bars 60, 61, which may be screwsets 65 installed transversely through the bars 61 as illustrated. Means for pressurizing the base 62 against the slot, which may alternatively be provided with a bar 61 for limiting the sliding movement in the transverse direction with respect to the slot and receiving the end of the screw driver ( 61 and the wheels 28 may be provided with slots. The bar 61 may be moved away from the bar 60 against the pressing of the spring to allow insertion and removal of the base 62 by a screwdriver.

The support roller 22 having a certain shape corresponding to the shape of the edge surface 14 in the direction perpendicular to the first direction in which the polishing belt 17 is driven is changed according to another type of wrench or bar, and is not shown. By means of a detachable attachment to the frame means. Along the path adjacent to the side of the polishing belt 17, the support surface 23 of the support roller 22 is approximately 1/8 inch thick graphite commercially available from Process Engineering, Inc., Illinois, USA. It can be covered with a covered lining, the graphite cover lining layer of the abrasive belt 17 along a constant support surface 23 when the wrench 12 is in pressure engagement with the abrasive belt 17 moving over the support roller. Facilitate sliding movement of the lining.

The wheel 28 has a predetermined diameter size (ie, 76 centimeters or 30 inches) at its periphery 27 and passes through the support surface 23 of the support roller 22 at a constant rotational speed of the wheel 28. The drive means for rotating the perimeter 27 comprises a helical gear 68 that is coaxially coupled to the wheel 28, which is about 61 centimeters or 24 inches, preferably the wheel 28. The worm gear 69 having a diameter of 25 centimeters or 10 inches in diameter and having a shaft at right angles to the axes of the helical gear 68 and the wheel 28 is combined with the helical gear 68 and has a variable speed motor ( A backlash between the gears 68 and 69 in close contact with the means for installing the worm gear 69 so as to be driven in a reflective manner with respect to the helical gear 68 and driven by the helical gear 68. Means for pressure-adjusting the teeth of the worm gear 69 to limit do. Means for installing the worm gear 69 to move reflexively with respect to the helical gear 68, and means for pressure-adjusting the teeth of the worm gear 69 to engage with the teeth of the helical gear are rotatable. And a portion 70 of the frame means, which protrudes at right angles to the axis of the worm gear 69, and the portion 72 of the frame means on which the wheel 28 is installed. And a plurality of parallel pins 71 accommodated in the socket to slide longitudinally at the pin, and between the frame portion 72 on which the wheel 28 is installed and the frame portion 70 on which the worm gear 69 is installed. A coil spring 73 provided along the 71 is further provided.

The means in the form of movable parts of the frame means and the adjustable mechanism between these parts are such that the wrench 12 is engaged with the polishing belt 17 along the support surface 23 in a predetermined manner on the edge surface 14. Precise alignment is provided between the wrench 12 and the support surface 23 in the jaws 35, 36 to form a radius.

The movable part of the frame means consists of a frame 81 of the belt drive mechanism 16, a floor 82 where the frame 81 is installed at a fixed position and two parallel rails supported at a fixed position on the floor 82. A fixed portion comprising an assembly 83; And a transversely movable portion 85 comprising a transversely movable plate 86 and four linear bearing assemblies 87 protruding from the bottom surface of the plate 86, the linear bearing assembly 87. Is installed around the rail assembly 83 for linear movement, and is in opposing contact with the upper surface of the transversely movable plate 86, and a vertical pivot axis adjacent thereto according to the transversely movable plate 86 90 horizontal pivotable portion 88 which is installed by bolts through plates 86 and 89 for horizontal pivoting movement around and which comprises a horizontal pivot plate 89 which is centered on the polishing belt 17. and; Around the horizontal axis parallel to the axis 26 of the wheel 28 formed by the pivot pin 92 at its side adjacent to the polishing belt 17 via the vertical pivotable portion 72 and the horizontal pivot plate 89. And a vertically pivotable portion 72 along the low pivot plate 86.

The adjustment assembly 100, which is manually operated by the wheel 101, is mounted on the vertical pivotable portion 72 of the frame means and has a lower end bearing and is screwable axially movable relative to the horizontal pivot plate 79. It has a screw jack portion with 102. The screw jacks are available from Minnesota Bearings, St. Paul, Minn., USA, and are designated by the trade name "Jaculator" T.M. Rotation of the wheel 101 translates the length of the portion of the rod 102 extending between the vertically pivotable portion 72 and the horizontal pivot plate 89, thereby pivoting the pin 92 relative to the horizontal pivot plate 89. Peripheral pivotal movement of the vertical pivotable portion 72 around the engagement between the edge 14 of the wrench 12 and the polishing belt 17 on the support surface 23 along the entire length of the wrench 12. To change.

The adjusting screw assembly 105 is manually operable by means of a wheel 106 connected to a shaft rotatably mounted on a bearing block 108 installed on the transversely movable plate 86 of the frame means, the shaft being It is coupled to an extensible or retractable rod assembly 107 having an end attached to the horizontal pivot plate 89 by a universal jaw 109.

Rotation of the wheel 106, ie rotation of the wheel 106 by turning the threaded rod portion into or out of the internal threaded socket portion, provides a means for varying the length of the rod assembly 102 and thus horizontal Horizontal pivoting of the pivot plate 89 is possible, and the wheel 28 is moved around the vertical pivot axis 90 from the upper surface of the transversely movable plate 86 so that the polishing belt ( In connection with 17) the engagement of one end of the wrench 12 is adjusted.

The adjusting screw assembly 110 is manually operated by a wheel 111 coupled to a shaft rotatably installed in a bearing block 113 mounted on a plate fixed to a floor 82 to which the rail assembly 83 is fixed. This shaft is connected by universal jaw 114 to an extendable or retractable rod assembly 112 having an end attached to the transversely movable plate 86 of the frame means. Rotation of the wheel 111 provides a means for varying the length of the rod assembly 112 by rotating the wheel by turning the threaded socket portion in and out of the internal threaded socket portion, whereby the wheel and transverse directions are provided. The horizontal movement of the movable plate 86 is enabled, which allows the contact area between the wrench 12 and the polishing belt 17 along the support roller 22 in a direction parallel to the axis 26 of the wheel 28. Supported through pivot portion 88 to adjust. Although the present invention has been described in accordance with the disclosed embodiments, it will be understood that various changes and modifications can be made by those skilled in the present invention without departing from the scope of the present invention. For example, when the abrasive assembly uses a straight edge portion on the bar or wrench with a radius of rotation, the abrasive belt used does not have to have a flexible seal. Instead of the support roller, the polishing belt 17 may be supported by a wheel having a specific shape or cylindrical periphery, depending on the shape of the radial bar or wrench. The no-load 48 may be positioned at any position between the support roller 22 and the load 33, and the operator may also load the load before positioning the wrench to finish between the jaws 35, 36. The finishing mechanism can be removed from the portion 33. The actuation means for moving the jaws 35, 36 between the release and engaging portions of the jaws may be provided by a mechanism which is operated by air or hydraulic pressure or by a mechanism other than the illustrated spring and can mechanism. The radius of the wheel 28 may be enlarged to form a soft surface with a large radius on the edge of the finished wrench or bar (i.e. 30 inches) and may also have a small radius on the edge of the wrench or bar to be finished. It can be made small (ie, 10 inches) to form an excited edge surface. The portion 72 of the frame means in which the wheel 28 is journaled is the wheel 28 between the pivot plate 86 and the portion 72 rather than being vertically pivotable about the pivot pin 92 with respect to the pivot plate 86. It can be rotatably installed on a rail disposed at right angles to the axis 26 of the. The illustrated belt polishing machine 16 can be replaced by a contact wheel to which the polishing belt is moved so that the contact wheel provides a backup plate, so that the modified belt polishing assembly is different from the soft surface of the bar to polish the gate. It can be used to polish the protrusions of cotton or other objects. The scope of the invention should not be construed as limited to only the structures described in this application.

Claims (7)

As long as a wrench 12 having a predetermined shape that may be linear or nonlinear along the length of the bar when viewed in the plane of the major surface, the side surface facing the initial edge 14 between the side surfaces. In a belt polishing assembly adapted to be used on a bar, the assembly 10 is formed to form a new soft surface 14 that is smoothly arcuate and extends between the side surfaces while maintaining a predetermined shape along the length of the bar. The assembly is adapted to polish a bar, the assembly comprising a frame, a lining having front and rear surfaces 18, 18 and a continuous polishing belt having abrasive particles attached along the front surface, and a first along a path to the frame. A mechanism for driving the polishing belt in a direction, along a path adjacent to the rear surface of the belt 17 and straight in the first direction, the first direction A support surface 23 having a uniform shape and a belt drive mechanism 16 is composed of a support roller 22 secured to the frame and corresponding to the shape of the edge surface 14 in a perpendicular direction; A wheel 28 having a perimeter 27 and an axis perpendicular to the first direction to sequentially move the perimeter 27 of the wheel 28 past the load station relative to the frame and beyond the support surface 23. A mechanism for mounting the wheel 28 on the frame to rotate around, a drive mechanism for rotating the wheel 28 past the support surface 23 at a constant rotational speed, and jaws 35 and 36. Circumference 27 of the wheel 28 so as to move relative between a release position spaced apart to freely receive the bar therebetween and a mating position adapted to securely hold the bar between the jaws 35, 36. Clamp mechanism with spaced jaws (35, 36) mounted on the rod), and the jaws (35, 36) are placed in the release position of the load station and the clamp assembly moves over the support surface (23). Jaw actuators for placing jaws (35, 36) in their mating positions And a bar operating means for moving the edge surface 14 of the bar at a constant speed along an arcuate path around an axis perpendicular to the first direction to be pressure-coupled with the polishing belt 17 along the support surface 23. Belt polishing assembly characterized in that. The drive mechanism according to claim 1, wherein the circumference 27 of the wheel 28 has a predetermined diameter and rotates the circumference 27 of the wheel 28 past the support surface 23 at a constant rotational speed. Helical gear 68 coaxially disposed with the wheel 28 and having a diameter within 25 cm of the diameter of the wheel 28, and engaged with the helical gear 68 and perpendicular to the axis of the helical gear 68; Backlash between the drive worm gear 69 having an axis and the means for installing the worm gear 69 to move radially relative to the helical gear 68 and the teeth of the drive worm gear 69 between the gears 68, 69. Belt grinding assembly, characterized in that it comprises a means for adjusting the pressure of the helical gear (68) in conjunction with it to limit. 2. The jaw (35) according to claim 1, wherein the jaws (35, 36) comprise: a first jaw (35), a mechanism for detachably attaching the first jaw to the circumference (27) of the wheel (28) in a fixed position; A second jaw (36) and means for installing a second jaw (36) on the wheel (28) to relatively move the first jaw (35) between the release and engagement positions; The mechanism comprises a spring between the jaws (35, 36) adapted to pressurize the second jaw (36) to the engaged position, a tappet (43) mounted on the second jaw (36) and a cam (mounted on the frame). 45 and 46, wherein the cam has a cam surface arranged to engage the tappet 43 to move the second jaw 36 to the release position. Assembly. 4. The mechanism of claim 3, wherein the mechanism for removably attaching the first jaw around the wheel 28 defines a slot extending generally parallel to the axis of the wheel 28 and having an inlet opening at one end. A base 62 having a structure 60, 61 on the wheel 28 having an opening and an opening for detachably holding the base 62 in the slot, wherein the first jaw 35 is adapted to closely fit the slot. Belt polishing assembly, characterized in that. 5. The wheel (28) according to claim 4, wherein the wheel (28) has a cylindrical peripheral surface (27), and the slot is at least one side surface disposed at an acute angle with respect to a portion of the peripheral surface (27) and the circumference of the wheel (28). (60, 61), wherein said means for retaining said detachment comprises a mechanism for urging said base (62) against said side surface (60, 61). 2. The clamp mechanism of claim 1, wherein the clamp mechanism comprises a plurality of pairs of spaced apart jaws 35, 36, the pairs being spaced apart on the periphery of the wheel 28 and each pair of the jaws 35, 36 is mounted on the wheel 28 to move relative between a release position freely receiving the bar therebetween and a mating position adapted to hold the bar firmly between the jaws 35 and 36, The jaw actuator moves each jaw pair (35, 36) to the release position of the load station and moves the jaws (35, 36) to the engagement position as the clamp device (10) moves past the support surface (23). After positioning and moving each pair of jaws 35 and 36 to a release position in an unloaded position fixed to the frame along the bottom of the wheel 28 and after passing through the support surface 23 at the load position, respectively. Of the jaw pairs (35, 36) are moved past the lowered position Belt grinding assembly as ranging. 3. The device of claim 2, wherein the means for installing the worm gear 69 to radially move relative to the helical gear 68 is such that the worm gear 69 is rotatably installed and protrudes perpendicular to the axis of the worm gear 69. A frame portion having a plurality of pins 71 and a helical gear 68 mounted thereon, and a socket for accommodating the pins 71 so that the pins 71 are axially moved in the sockets. And means for pressurizing the teeth of the drive worm gear 69 to engage with the teeth of the helical gear 68 to limit the backlash between the gears 68, 69 between the helical coils around the pins 71 between the frame portions. A belt polishing assembly comprising a spring (73).