US3831405A

US3831405A - Roughing machine with roughing tool sharpening mechanism

Info

Publication number: US3831405A
Application number: US00399881A
Authority: US
Inventors: W Vornberger
Original assignee: International Shoe Machine Corp
Current assignee: International Shoe Machine Corp
Priority date: 1973-09-24
Filing date: 1973-09-24
Publication date: 1974-08-27
Anticipated expiration: 1991-08-27

Abstract

A mechanism for sharpening the roughing tool of a roughing machine. The roughing machine includes a roughing tool mounted to a rougher unit. The rougher unit is moveable between an upper position wherein the roughing tool is in an idle position and a lower position wherein the roughing tool is in a roughing position and is effective to rough the upper margin of a shoe assembly. A sharpening tool is mounted for movement between an idle position wherein it is spaced from the roughing tool and a working position wherein it is in engagement with the roughing tool. A positioning device is effective to bring the sharpening tool to its working position when the roughing tool is in its idle position.

Description

United States Patent [191 Vornberger [451 Aug. 27, 1974 ROUGHING MACHINE WITH ROUGHING TOOL SHARPENING MECHANISM [75] Inventor: Walter Vornberger, Tewksbury,

Mass.

[73] Assignee: International Shoe Machine Corporation, Nashua, NH.

22 Filed: Sept. 24, 1973 21 Appl. No.: 399,881

[56] References Cited UNITED STATES PATENTS 11/1932 Dronsfield 51/242 X l/l935 Brostrom 69/65 l/l942 Johnson 69/65 X 2,752,772 I 7/1956 Hlobil 69/65 Primary Examiner Alfred R. Guest Attorney, Agent, or Firm-Albert Gordon [57] ABSTRACT A mechanism for sharpening the roughing tool of a roughing machine. The roughing machine includes a roughing tool mounted to a rougher unit. The rougher unit is moveable between an upper position wherein the roughing tool is in an idle position and a lower po sition wherein the roughing tool is in a roughing position and is effective to rough the upper margin of a shoe assembly. A sharpening tool is mounted for movement between an idle position wherein it is spaced from the roughing tool and a working position wherein it is in engagement with the roughing tool. A positioning device is effective to bring the sharpening tool to its working position when the roughing tool is in its idle position.

15 Claims, 8 Drawing Figures PAIENIEn M827 1914 BACKGROUND OF THE INVENTION This invention is Concerned with a sharpening mechanism for sharpening a roughing tool of a roughing machine of the general type disclosed in pending application Ser. No. 392,850 filed Aug. 30, 1973. In this machine the roughing tool is in a lower working position during a machine cycle to rough the upper margin of a shoe assembly and is moved upwardly of this working position to an idle position between machine cycles. While the prior art, as illustrated by US. Pat. Nos. 1989078, 2270446 and 2752772, discloses sharpening mechanisms for roughing machines, they do not disclose sharpening mechanisms which are suitable for use in a roughing machine of the type disclosed in the pending application that is so constructed as to enable the roughing tool to be sharpened when it is in its idle position between machine cycles.

SUMMARY OF THE INVENTION In this invention, the sharpening attachment is so mounted to the roughing machine that it is movable heightwise between an idle position wherein it is spaced from the roughing tool and a working position wherein it is in engagement with the roughing tool. The sharpening tool is normally retained in its idle position and is caused to move into its working position to sharpen the roughing tool between machine cycles when the roughing tool is in its idle position.

The roughing machine of the pending application includes a rougher unit that is mounted to a sleeve. A shaft,located, within the sleeve, is rotated by a motor and is drivingly connected to the roughing tool which is mounted on the rougher unit so as to rotate the roughing tool. The sharpening mechanism of this invention includes a sharpener unit mounted to the sleeve for heightwise movement. The sharpening tool is rotatably mounted to the sharpener unit, is located above the roughing tool, and is drivingly connected to the sleeve. A positioning mechanism interposed between the rougher unit and the sharpener unit is effective to move the sharpener unit between a position wherein the sharpening tool is spaced from the roughing tool and a position wherein the sharpening tool is in engagement with the roughing tool. The sharpening tool is so drivingly connected to the sleeve that it is rotated by the motor while it is in both of its positions and during its movements between its positions.

BRIEF DESCRIPTIONS OF THE DRAWINGS FIG. 1 is a side elevation of the machine; FIG. 2 is a view taken along the line 22 of FIG. 1;

FIG. 3 is a view taken along the line 33 of FIG. 1;

F IG. 4 is a view showing a shoe assembly in the process of having its upper margin roughed;

FIG. 5 is a view taken along the line 5-5 of FIG. 4;

FIG. 6 is an enlargement of a bristle projecting from the roughing tool;

FIG. 7 shows the roughing tool bristle as it is roughing the upper margin; and

FIG. 8 shows the roughing tool bristle at the completion of a roughing operation.

DESCRIPTION OF THE PREFERRED EMBODIMENT nected to a slide 16 that is mounted for forwardrearward movement in the frame 10. Trunnions 18 on the slide 16 pivotally mount a yoke 20 for heightwise swinging movement about the horizontal axis of spindles 22 that are rigid with the yoke 20 and that are rotatably mounted in the trunnions 18. Air operated motors 24 (only one of which is shown) are pivotally mounted on a bracket 26 on the slide 16 and have upwardly extending piston rods 28 that are pivotally connected to the yoke 20 to effect heightwise swinging movement of the yoke 20 about the axis of the spindles 22.

Referring to FIGS. 1 and 2, a hollow shaft 30 extends forwardly and rearwardly through the yoke 20 and is so mounted in the yoke 20 that it is fixed against forwardrearward movement in the yoke 20. A fork 32, having a pair of forwardly extending tines 34 (see also FIGS. 4 and 5) is mounted to the front of the shaft 30.

A housing 36 is mounted to the shaft 30 by means of a front trunnion 38 and a back trunnion 40, the trunnions being so mounted to the shaft as to be locked against forward-rearward movement on the shaft. A yoke 42 is mounted, by pivot pins 44, to the front trunnion 38. A block 46 is rigidly mounted to the yoke 42. A hollow sleeve 48 extends between the block 46 on one side of the yoke 42 and a projection 50 on the other side of the yoke 42. A rougher unit 52 is pivotally mounted on the sleeve 48 for height-wise movement. The piston rod 54 of an air operated motor 56 is pivoted on a pin 58 that is mounted to the trunnion 38. The piston rod 54 is slideable in a clevis 60 which pivotally mounts the cylinder 62 of the motor 56. The clevis 60 is rigidly mounted to the rougher unit 52. The operation of the motor 56 is effective to raise and lower the cylinder 62 to thereby raise and lower the rougher unit 52 about the axis of the sleeve 48.

A roughing tool in the form of a wire brush 64 is so rotatably mounted to the front of the rougher unit 52 that the bottom of the brush periphery is located proximate to and between the fork tines 34 (see FIG. 5). A reversible electric motor 66 is rigidly mounted to the block 46. The motor 66 is drivingly connected by way of a pulley 68, a belt 70 and a pulley 72 to a pulley shaft 74 that is rotatably mounted in and is concentric with the hollow sleeve 48. The pulley shaft 74 is drivingly connected by way of a pulley 76, a belt 78 and a pulley 80 to the brush 64 so as to enable the motor 66 to rotate the brush 64.

A bar 82 is mounted within the shaft 30 for forwardrearward movement. A sensing finger 84 is mounted to the front of the bar 82 and is located below and between the fork tines 34 (see FIG. 5).

A sharpener unit 86 is pivotally mounted on the sleeve 48 by legs 88 that straddle the rougher unit 28.

1 A sharpening tool in the form of a grinding wheel 89 is so rotatably mounted to the front of the sharpener unit 86 that the bottom of the grinding wheel periphery is located above the top of the periphery of the brush 64. The cylinder 90 of a positioning device in the form of an air actuated motor 92 (FIG. 3) is pivotally mounted to the sharpener unit 86 and the piston rod 94 of the motor 92 is pivotally mounted to the rougher unit 52. The pulley shaft 74 is drivingly connected by way of a pulley 96, a belt 98 and a pulley 100 to the grinding wheel 89 so as to enable the motor 48 to rotate the grinding wheel 89.

In the idle condition of the machine: the piston rod 14 is retracted into the motor 12 to place the slide 16, together with the rougher unit 52, in a rearward position; the piston rods 28 are projected out of the motors 24 to place the rougher unit 52 in an upper position wherein the brush 64 is in an idle position; the cylinder 62 is projected upwardly of the piston rod 54 to maintain the rougher unit 52 in an upper position with respect to the block 46 to maintain the brush 64 in a relatively elevated position with respect to the fork tines 34; the cylinder 90 is projected upwardly of the piston rod 94 to maintain the grinding wheel 89 in a relatively elevated idle position with respect to the brush 64 wherein the periphery of the grinding wheel is spaced from the periphery of the brush 64; and the electric motor 66 is operative to rotate the brush 64 and the grinding wheel 89 clockwise as seen in FIG. 1.

FIGS. 4 and 5 show a shoe assembly that comprises a last 102 having an upper 104 mounted thereon and an insole 106 located on its bottom. The upper 104 has been lasted so that the upper margin 108 lies against and is secured to the insole and extends inwardly of the periphery of the insole and of the last bottom.

The shoe assembly is supported bottom-up on the shoe assembly support disclosed in the aforementioned application Ser. No. 392,850 and the machine is caused to go through a machine cycle as described in said application. At the beginning of the machine cycle, the motors 24 are actuated to lower the shaft 30 and the bar 82, together with the rougher unit 52, the fork tines 34 and the sensing finger 84. At the same time as motors 24 are so actuated, the motor 12 is actuated, by the mechanism shown in the aforementioned application Ser. No. 392,850 to project its piston rod 14 forwardly to move the shaft 30 and the bar 82, together with the rougher unit 52, the fork tines 34 and the sensing finger 84 forwardly. This lowering movement continues until the fork tines 34 engage a breast line portion region of the upper margin 104 and this forward movement continues until the sensing finger 84 engages the side of the shoe assembly as indicated in FIGS. 4 and 5. Concomitantly with this actuation of the motors 24, the motor 66 is reversed so as to rotate the brush 64, as well as the grinding wheel 89, counterclockwise as seen in FIG. 1. In response to the engagement of the fork tines 34 with the upper margin 108, the motor 56 is so actuated as to lower the cylinder 62 under the force of pressurized air to thereby swing the rougher unit 52 downwardly about the axis of the sleeve 48 until radially projecting bristles 110 on the brush 64 engage the upper margin 108 between the fork tines 34, as indicated in FIGS. 4 and 5, and the shoe assembly support is so operated as to move the entire upper margin 108 past the rotating brush 64, which is now in a lower working position, to thereby enable the brush bristles 110 to rough or abrade the upper margin. At the end of the machine cycle, with the exception of the operation of the

motors

66 and 92 which are described below, the parts are returned to their idle positions with the rougher unit 52 being raised to its idle position by the motors 24 to raise the brush 64 out of engagement with the shoe assembly and into its idle position. The shoe assembly, with its upper margin 108 roughed, is now released from the machine.

During the machine cycle, the motor 92, due to the projection of the cylinder upwardly of the piston rod 94, maintains the grinding wheel 89 in its idle position spaced from the brush bristles 110 with the sharpener unit 86 moving upwardly and downwardly in unison with the rougher unit 52. The rotating brush bristles 110, during the machine cycle, move inwardly of the outer periphery of the shoe assembly (clockwise in FIG. 4) as they engage and rough the upper margin.

concomitantly with the actuation of the motors 24 to raise the shaft 30 and the bar 84, together with the rougher unit 52, the fork tines 34 and the sensing finger 84, to their idle positions, the motor 66 is reversed to reverse the rotation of the brush 64 and the grinding wheel 89 so that they rotate clockwise as seen in FIG. 1 and counterclockwise as seen on F IG. 4. A short time after this, the motor 92 is actuated to move the cylinder 90 downwardly with respect to the piston rod 94 to thereby resiliently move the grinding wheel 89 into a working position of engagement with the bristle 110 of the brush 64 to thus sharpen the brush bristles. After a predetermined time period, the motor 92 is again actuated to project the cylinder 90 upwardly of the piston rod 94 to its idle position to thereby raise the grinding wheel 89 to its idle position and thus place the machine in readiness for a new machine cycle.

It is desirable, at the beginning of each machine cycle, that the radially outermost surface 112 of each brush bristle 110 lie in a plane that is substantially at rigid angles to the bristle axis as indicated in FIG. 6. During the roughing operation the bristles, which are resilient, are deflected oppositely from their directions of movement as they engage and rough the upper margin, as indicated in FIG. 7, so that the radially outermost surface of the bristles become sloped as indicated by number 114 in FIG. 8. In order to so sharpen the bristles that their radially outermost surfaces again lie in the FIG. 6 position in a plane that is substantially at right angles to the bristle axes, it is desirable to have the bristles move relatively to the grinding wheel 89 in a direction such that the radially outermost portion of the bristle surface 114 (HO 8) first engages the grinding wheel 89 and it is for this reason that the motor 66 is reversed to reverse the directions of rotation of the brush 64 from the direction in which the brush rotates during its roughing operation. The sharpening operation in enhanced by virtue of the fact that the peripheral surfaces of the grinding wheel 89 and the brush 64 are moving in opposite directions as they engage each other.

By mounting the sharpening unit 84 for swinging movement about the common axis of the sleeve 48 and the pulley shaft 74 and by having the grinding wheel 89 rotated by the drive formed by the pulley 96, the belt 98 and the pulley 100 from the pulley shaft 74, assurance is provided that the grinding wheel rotates during its movement toward and away from and during its engagement with the brush bristles l regardless of the radial distance between the radially outermost portions of the brush bristles and the axis of rotation of the brush 64.

I claim:

1. A machine for roughing the margin of an upper of a shoe assembly, said shoe assembly comprising at last having an insole located on' its bottom and the upper mounted thereon with the upper margin lying against and being secured to the periphery of the insole, comprising: a rougher unit having a roughing tool mounted thereto, mounted for heightwise movement between an upper idle roughing tool position wherein the roughing tool is spaced from the upper margin of a shoe assembly supported in the machine and lower working roughing tool positions wherein the roughing tool is effective to perform a roughing operation to rough the upper margin of the shoe assembly during relative movement of the upper margin with respect to the roughing tool; means for initially retaining the rougher unit in said idle position; means for thereafter lowering the rougher unit to said working positions so as to enable said roughing operation to be performed; means, effective after the completion of said roughing operation, to return the rougher unit to said idle position; a sharpening tool mounted for movement between a sharpening tool idle position wherein the sharpening tool is spaced from the roughing tool and a sharpening tool working position wherein the sharpening tool is in engagement with the roughing tool; means for normally retaining the sharpening tool in said sharpening tool idle posi tion; and means, effective when the roughing tool is in said roughing tool idle position, to first move the sharpening tool into said sharpening tool working position and then return the sharpening tool to said sharpening tool idle position.

2. The machine of claim 1 wherein the roughing tool is mounted to the rougher unit for rotation in'first and second directions; wherein the roughing tool comprises a brush having radially projecting bristles; and further comprising: means for rotating the roughing tool in said first direction while the rougher unit is in said working roughing tool positions; and means, effective when the sharpening tool is in said sharpening tool working position, to rotate the roughing tool in said second direction.

3. The machine of claim 2 wherein the means for moving the rougher unit between said idle and working roughing tool positions comprises: a first motor so connected to said rougher unit as to be effective, in response to actuations of said first motor, to effect the rougher unit movements between said idle and working roughing tool positions; and wherein the means for effecting said rotations of the roughing tool in said directions comprises: a second reversible motor drivingly connected to the roughing tool; means, effective concomitantly with the actuation of said first motor to move the rougher unit from a roughing tool working position to the roughing tool idle position, to cause the second motor to rotate the roughing tool in its second direction and to move the sharpening tool from said sharpening tool idle position to said sharpening tool working position; and further comprising: means, effective concomitantly with the actuation of said first motor to move the rougher unit from the roughing tool idle position to a roughing tool working position while the sharpening tool is in its idle position, to cause said second motor to rotate the roughing tool in said first direction.

4. The machine of claim 3 further comprising: means mounting the sharpening tool for rotation; and means so drivingly connecting the sharpening tool to said second motor as to cause the second motor to rotate the sharpening tool in the same direction as it rotates the roughing tool.

5. The machine of claim 1 further comprising: a sharpener unit; means mounting the sharpening tool to the sharpener unit; means so mounting the sharpener unit for heightwise movement that the sharpening tool is located above the roughing tool; and sharpening tool positioning means interposed between the rougher unit and the sharpener unit effective to so locate the sharpener unit as to locate the sharpening tool in said sharpening tool positions and to so move the sharpener unit as to move the sharpening tool between said sharpening tool positions.

6. The machine of claim 5 wherein the roughing tool is mounted to the rougher unit for rotation in first and second directions; wherein the roughing tool comprises a brush having radially projecting bristles; and further comprising: means for rotating the roughing tool in said first direction while the rougher unit is in said first roughing tool position; and means, effective when the sharpener unit is so located as to locate the sharpening tool in said first sharpening tool working position, to rotate the roughing tool in said second direction.

7. The machine of claim 6 wherein the means for moving the rougher unit between said idle and working roughing tool positions comprises: a first motor so connected to said rougher unit as to be effective, in response to actuations of said first motor, to effect the rougher unit movements between said idle and working roughing tool positions; and wherein the means for effecting said rotations of the roughing tool in said directions comprises: a second reversible motor drivingly connected to the roughing tool; means, effective concomitantly with the actuation of said first motor to move the rougher unit from a roughing tool working position to the roughing tool idle position, to cause the second motor to rotate the roughing tool in its second direction and to cause the positioning means to so move the sharpener unit as to move the sharpening tool from said sharpening tool idle position to said sharpening tool working position; and further comprising: means, effective concomitantly with the actuation of said first motor to move the rougher unit from the roughing tool idle position to a roughing tool working position while the positioning means so locates the sharpener unit as to locate the sharpening tool in its idle position, to cause the second motor to rotate the roughing tool in said first direction.

8. The machine of claim 7 further comprising: means mounting the sharpening tool to the sharpener unit for rotation; and means so drivingly connecting the sharpening tool to said second motor as to cause said second motor to rotate the sharpening tool in the same direction as it rotates the roughing tool.

9. A machine for roughing the margin of an upper of a shoe assembly, said shoe assembly comprising a last having an insole on its bottom and the upper mounted thereon with the upper margin lying against and being secured to the periphery of the insole, comprising: a sleeve; a shaft so located within the sleeve as to be coaxial with the sleeve; a rougher unit, having a roughing tool rotatably mounted to its front, mounted to the sleeve for heightwise movement about the sleeve axis between an upper roughing tool idle position wherein the roughing tool is spaced from the upper margin of a shoe assembly supported in the machine and lower roughing tool working positions wherein the roughing tool is effective to perform a roughing operation to rough the upper margin of the shoe assembly during relative movement of the upper margin with respect to the roughing tool; powered means operatively connected to the shaft to rotate the shaft; first drive means so drivingly connecting the shaft and the roughing tool as to enable the powered means to rotate the roughing tool; a sharpener unit mounted to the sleeve for heightwise movement about the sleeve axis; a sharpening tool rotatably mounted to the front of the sharpener unit and located above the roughing tool; sharpening tool positioning means interposed between the rougher unit and the sharpener unit effective to so locate and move the sharpener unit that the sharpening tool can be located in and move between a sharpening tool idle position wherein the sharpening tool is spaced from the roughing tool and a sharpening tool working position wherein the sharpening tool is in engagement with the roughing tool; second drive means so drivingly connecting the sharpening tool and the shaft as to enable the powered means to rotate the sharpening tool while the sharpening tool is in said sharpening tool positions and during the movements of the sharpening unit to move the sharpening tool between said sharpening tool positions; means for initially retaining the rougher unit in said idle roughing tool position; means for thereafter lowering the rougher unit to a roughing tool working position so as to enable said roughing operation to be performed; means, effective after the completion of said roughing operation, to return the rougher unit to said roughing tool idle position; means for normally causing said positioning means to retain the sharpener unit in said sharpening tool idle position; and means, effective when the roughing tool is in said roughing tool idle position, to first cause the positioning means to so move the sharpener unit as to move the sharpening tool to said sharpening tool working position and then cause the positioning means to so move the sharpener unit as to return the sharpening tool to said sharpening tool idle position.

10. The machine of claim 9 wherein the roughing tool comprises a brush having radially projecting bristles, and further comprising: means so constructing the powered means as to cause the shaft to rotate in opposite directions to thereby rotate the roughing tool and the sharpening tool in such a manner that both tools are rotated in first directions when the rougher unit is in said roughing tool working positions and to cause the shaft to rotate both tools in second directions when the sharpening tool is in said sharpening tool working position.

11. The machine of claim 10 wherein the means for moving the rougher unit between said idle and working roughing tool positions comprises: a first motor so connected to said rougher unit as to be effective, in response to actuations of said first motor, to effect the rougher unit movements between said idle and working roughing tool positions; and wherein the construction of the powered means for effecting the rotations of the shaft in opposite directions to effect the rotations of the roughing tool and the sharpening tool in said first and second directions comprises: a second reversible motor drivingly connected to the shaft; means, effective concomitantly with the actuation of said first motor to move the rougher unit from a roughing tool working position to a roughing tool idle position, to cause the second motor to so rotate the shaft as to rotate both tools in their second directions and to cause the positioning means to so move the sharpener unit as to move the sharpening tool from said sharpening tool idle position to said sharpening tool working position; and further comprising: means, effective concomitantly with the actuation of said first motor to move the rougher unit from the roughing tool idle position to a roughing tool working position while the positioning means so locates the sharpener unit as to locate the sharpening tool in its idle position, to cause the second motor to so rotate the shaft as to rotate both tools in their first directions.

12. A sharpening mechanism for use in a roughing machine that comprises: a sleeve; a shaft so located within the sleeve as to be coaxial with the sleeve; a rougher unit, mounted to the sleeve, extending forwardly of the sleeve; 21 roughing tool rotatably mounted to the front of the rougher unit; powered means operatively connected to the shaft to rotate the shaft; and first drive means so drivingly connecting the shaft and the roughing tool as to enable the motor to rotate the roughing tool; said sharpening mechanism comprising: a sharpener unit, mounted to the sleeve for heightwise movement about the sleeve axis, extending forwardly of the sleeve; a sharpening tool rotatably mounted to the front of the sharpener unit and located above the roughing tool; sharpening tool positioning means interposed between the rougher unit and the sharpener unit effective to move the sharpening tool between an idle sharpening tool position wherein its periphery is spaced from the roughing tool periphery and a working sharpening tool position wherein the peripheries of the roughing and sharpening tools are in engagement; and second drive means so drivingly connecting the sharpening tool and the shaft as to enable the powered means to rotate the sharpening tool while the sharpening tool is in said positions and during its movements between said positions.

13. The combination as defined in claim 12 wherein the roughing tool comprises: a brush having radially projecting bristles and wherein said powered means is so constructed as to cause the shaft to rotate the roughing tool and the sharpening tool in opposite directions in such a manner that both tools are rotated in first directions when the sharpening tool is in said idle sharpening tool position and both tools are rotated in second directions when the sharpening tool is in said working sharpening tool position.

14. The combination as defined in claim 13 wherein said first and second drive means are so constructed as to concomitantly rotate both tools in the same direction about their axes of rotation.

15. The combination as defined in claim 12 wherein said first and second drive means are so constructed as to concomitantly rotate both tools in the same direction about their axes of rotation.

Claims

1. A machine for roughing the margin of an upper of a shoe assembly, said shoe assembly comprising at last having an insole located on its bottom and the upper mounted thereon with the upper margin lying against and being secured to the periphery of the insole, comprising: a rougher unit having a roughing tool mounted thereto, mounted for heightwise movement between an upper idle roughing tool position wherein the roughing tool is spaced from the upper margin of a shoe assembly supported in the machine and lower working roughing tool positions wherein the roughing tool is effective to perform a roughing operation to rough the upper margin of the shoe assembly during relative movement of the upper margin with respect to the roughing tool; means for initially retaining the rougher unit in said idle position; means for thereafter lowering the rougher unit to said working positions so as to enable said roughing operation to be performed; means, effective after the completion of said roughing operation, to return the rougher unit to said idle position; a sharpening tool mounted for movemenT between a sharpening tool idle position wherein the sharpening tool is spaced from the roughing tool and a sharpening tool working position wherein the sharpening tool is in engagement with the roughing tool; means for normally retaining the sharpening tool in said sharpening tool idle position; and means, effective when the roughing tool is in said roughing tool idle position, to first move the sharpening tool into said sharpening tool working position and then return the sharpening tool to said sharpening tool idle position.

2. The machine of claim 1 wherein the roughing tool is mounted to the rougher unit for rotation in first and second directions; wherein the roughing tool comprises a brush having radially projecting bristles; and further comprising: means for rotating the roughing tool in said first direction while the rougher unit is in said working roughing tool positions; and means, effective when the sharpening tool is in said sharpening tool working position, to rotate the roughing tool in said second direction.

12. A sharpening mechanism for use in a roughing machine that comprises: a sleeve; a shaft so located within the sleeve as to be coaxial with the sleeve; a rougher unit, mounted to the sleeve, extending forwardly of the sleeve; a roughing tool rotatably mounted to the front of the rougher unit; powered means operatively connected to the shaft to rotate the shaft; and first drive means so drivingly connecting the shaft and the roughing tool as to enable the motor to rotate the roughing tool; said sharpening mechanism comprising: a sharpener unit, mounted to the sleeve for heightwise movement about the sleeve axis, extending forwardly of the sleeve; a sharpening tool rotatably mounted to the front of the sharpener unit and located above the roughing tool; sharpening tool positioning means interposed between the rougher unit and the sharpener unit effective to move the sharpening tool between an idle sharpening tool position wherein its periphery is spaced from the roughing tool periphery and a working sharpening tool position wherein the peripheries of the roughing and sharpening tools are in engagement; and second drive means so drivingly connecting the sharpening tool and the shaft as to enable the powered means to rotate the sharpening tool while the sharpening tool is in said positions and during its movements between said positions.