CA1157686A - Mechanical quill having selective braking capability - Google Patents
Mechanical quill having selective braking capabilityInfo
- Publication number
- CA1157686A CA1157686A CA000371249A CA371249A CA1157686A CA 1157686 A CA1157686 A CA 1157686A CA 000371249 A CA000371249 A CA 000371249A CA 371249 A CA371249 A CA 371249A CA 1157686 A CA1157686 A CA 1157686A
- Authority
- CA
- Canada
- Prior art keywords
- motor
- quill
- armature
- shaft
- drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/0078—Safety devices protecting the operator, e.g. against accident or noise
- B23Q11/0092—Safety devices protecting the operator, e.g. against accident or noise actuating braking or stopping means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/22—Feeding members carrying tools or work
- B23Q5/32—Feeding working-spindles
- B23Q5/326—Feeding working-spindles screw-operated
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
- Braking Arrangements (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Abstract:
MECHANICAL QUILL HAVING SELECTIVE BRAKING CAPABILITY
A mechanical quill having selective braking capability, achieved by a pneumatic cylinder (110) mounted to one motor (80) for selectively driving a braking member (120) into a braking material (104) coupled to a motor armature (84). This braking member (120) interrupts a clutch-type drive path through the motor as desired, to prevent advance of a quill.
MECHANICAL QUILL HAVING SELECTIVE BRAKING CAPABILITY
A mechanical quill having selective braking capability, achieved by a pneumatic cylinder (110) mounted to one motor (80) for selectively driving a braking member (120) into a braking material (104) coupled to a motor armature (84). This braking member (120) interrupts a clutch-type drive path through the motor as desired, to prevent advance of a quill.
Description
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MEc~ANIcAL QUILL HAVING SELECTIVE BRAKING CAPABILITY
TECHNICAL FIE~D
The present invention relates to quill drives or machining units for machine tools. More particularly, the present invention has particular relevance to electrically-powered, mechanically-linked two-speed quill drives.
BACKGROUND ART
U.S. Patent 3,885,635 entitled "Two Speed Mechanical Quill Feed and Spindle Drive Mechanism for a Machine Tool", herein incorporated by reference and sometimes referred to as the "Mechanical Quill Patent", describes a mechanical quill drive system having many similarities to the present invention. In that patent, a quill is advanced by an external screw cooperating with a ball nut having a two speed drive. The two speed drives includes a motor driving the nut directly through gearing during rapid infeed of the quill, but which motor is itself driven through a clutch and reduction gearing by a second motor to produce the slow-speed infeed of the quill and which second motor also rotates the spindle by a driving connection with the splined drive shaft at a reduction during infeed. U.S. Patent 4,000,661 is a division of U.S. Patent 3,885,635.
In some applications for such quill systems, it is desirable to allow the spindle motor to run continuously, without advancing or retracting the spindle. Such spindle operation minimizes the sophistication and cost of the motor controls, but is not possible in the apparatus described in the Mechanical Quill Patent.
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~ b 170-80-0020 In other applications it is desirable to mount the quill unit with the spindle extending vertically. In such cases the mass of the quill and spindle have a tendency to cause undesirable or downward movement ("drift") of the spindle.
In some applications it is desirable to interrupt the feed stroke for chip breaking or dwelling at the completion of the stroke to assure a good finish of blind holes. The Mechanical Quill Patent cannot conveniently perform this task without substantial modification of the motor controls. Without a dwell capability, an undesirable burr is frequently created in machining.
Other feed mechanisms for quill shafts of a type used in machine tools have been in use for many, many years. While quite satisfactory hydraulic design approaches have existed in the past, current trends are for various reasons dictating a "mechanical" approach to the quill unit drive. Such mechanical drives developed to date have various drawbacks.
One such approach involves a screw actuator disposed parallel to the quill shaft which is rotated at two speeds to provide the two-speed advance of the quill shaft. An example of this design is found in U.S. Patent No. 3,561,544. Another somewhat similar approach common also in single speed drill press type applications has involved a rack or cam drive of the quill shaft; such as shown in U.S. Patent Nos. 2,545,008 and 2,902,891, as well as in German Patent No. 846,807.
These approaches have the common difficulty of excessive runout of the spindle shaft since the feed forces are not aligned with the axis of the motion of the quill shaft. While some attempts to overcome this prob-5 lem have been made by a power screw arrangement concen-tric with the quill shaft as exemplified by U.S. Patent Nos. 2,796,676; 2,975,440; 3,430,524; and 3,139,637, these designs require bearings on a spindle shaft forward of the screw shaft and hence are quite cumbersome, and 10 runout problems may also exist due to the long unsup-ported screw portion overhung at one end of the quill shaft of the mechanism, and also frictional loads may be quite high.
A concentric ball screw advancing mechanism has been described in U.S. Patent No. 3,640,147 which would sub-stantially alleviate the friction loads, but this design provides only a single speed feed motion and the screw portion is, similar to the above examples, overhung at 20 one end of the quill shaft necesssitating a critical bearing adjustment arrangement to control runout.
This particular means for providng a two-speed feed drive previously proposed have also not been without 25 significant drawbacks.
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A common approach seen in some of the aforementioned patents as well as U.S. Patent No. 3,283,664 has been to provide a pair of motors driving through either a plane-- 30 tary or screw differential gearing. Such gearing is expensive and the controls tend to be quite complex.
~ nother approach is to provide a variable speed commutated motor driven at variable speed, but such motors as compared to constant speed induction motors require more maint,enance (due to the brushes) and require expensive and complex electrical or electronic control systems.
Another approach is shown in U.S. Patent 4,2~1,271 but requires costly controls.
According to the present invention thère is provided a quill unit including a frame, a first motor mounted on a *rame, a second motor mounted on a frame and including an armature and a hollow quill shaft mounted to the frame and driven by a coupling to the second motor. A machining element is rotatably mounted in the hollow quill shaft and is driven by a coupling to the first motor. Drive means is coupled between the first motor and the second motor armature for driving the second motor armature in response to rotation of the first motor when the second motor is not energized, the drive means including a coupling clutch. Means is provided for selectively disengaging the drive means to the second motor armature, means including the armature means for removing the clutch coupling in response to a signal.
It is an advantage of the present invention to provide a reliable two-speed drive with a minimum of gearing and controls which is capable of accurately controlling the point at which the shift to the lower speed infeed is carried out. Other objects and advantages will be apparent to those skilled in this art in view of the following description of the invention of the drawings.
In a specific embodiment of the present invention an pc/ I
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electrically powered, mechanically coupled quill unit has a selective quill braking capability achieved by a pneumatic cylinder mounted to the motor and adapted to decouple the armature from rotation by a drive cone gear coupled to the spindle motor. The cylinder selectively disengages a clutch drive through the second motor armature by moving the armature axially away from the gear cone to decouple the drive path.
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BRIEF DESCRIPTION OF THE DRAWINGS
FIGURE 1 is a partially sectional view of the quill unit of the present invention.
FIGURE 2 is an enlarged cross sectional view of a motor braking arrangement of the present invention, before the motor brake has been applied.
FIGURE 3 is a view of the motor braking arrangement of the present invention with the motor brake applied.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIGURE 1, a mechanical quill unit 10 is depicted in partial section taken along its longitudinal axis, which is adapted to be piloted to a mountiny structure 12.
The quill unit 10 includes a hollow spindle shaft 14 to which a tool or toolholder (not shown) is to be mounted. The spindle shaft 14 is rotatably mounted within a hollow quill shaft 16 so as to be carried along together with the quill shaft 16 during linear movement thereof radial and thrust bearing sets 18 and 20 being provided for this purpose.
The quill shaft 16 is in turn mounted in the unit housing 22 for sliding movement along its longitudinal axis by means of a slidàble fit with two spaced bore surfaces 24 and 26.
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: ~ , The spindle shaft 14 is adapted to be rotated within the quill shaft 16 during machining operations by means of a power shaft 28 having an exteriorly splined portion 30 passing within the spindle shaft 14 and rotatively connected thereto by means of a mating interior spline 32 formed within the spindle shaft 14. It can be seen that this rotative connection will be maintained with relatively linear movement occurring during infeed as will be described herein between the power shaft 28 and the spindle shaft 14 by virtue of this splined connection.
The power shaft 28 is also formed with an extension portion 34 integral with the splined portion 30 and mounted at one end with the quill shaft 16 by means of a thrust and radial load bearing set 36 carried by a sleeve 38 slidable within the quill shaft 16. The bearing set 36 is axially fixed to the extention portion by means of engagement with a shoulder 40 and a retainer 42. The extension portion 34 is supported at the other end in the housing 22 by means of a bearing 44.
The power shaft 28 is rotated by means of a pulley wheel 46 fixed to a reduced end portion 48, the pulley wheel 46 in turn being driven by a belt 50 passing around the pulley wheel and also a smaller pulley wheel 52 affixed to the armature shaft 54 of an electric motor 56.
The quill shaft 16 is adapted to be axially advanced by cam means including a semicircular helical groove 58 formed about its our periphery, this groove cooperating : with a recirculating ball nu~ arrangement 60 which in turn includes a plurality of balls 62, a drive member constituted by a nut 64 rotatively supported in the housing 22 by radial thrust bearings 66 and 68 and surrounding the quill shaft 16, and a ball return 70.
Rotation of the nut 64 which is axially fixed by means of the bearings 66 and 68 thus causes axial advnace of the quill shaft 16 in the same manner as the well known recirculating ball screw machines.
The quill shaft 16 is restrained against rotation in the housing 22 by means of a pair of keys 61, 63 carried in the exterior of the quill shaft 16 sliding in respective longitudinal slots 65, 67 formed in thehousing 22. This arrangement is necessary since the drive of the - nut 62 creates a rotative reaction which if not countered would result in no axial movement of the quill shaft 16.
15The nut 62 is rotated in the housing 22 by means of gear teeth 72 machined into the outer portion of the nut 62, meshing with an idler gear 74 supported in the housing 22 which is in turn driven by a drive pinion 76 fixed to an output shaft 78 driven by a second electric motor 80.
The second electric motor 80 has an armature extension 84 and is of the sliding armature type such : that when it is not energized to drive the pinion 76, clutch means including a drive gear cone 82 is engaged which allows driving of the motor armature extension 84 ~ (and thus the connected armature) and connected output ; shaft 78 by means of a reduction gear 88,90 driven by a shaft 96 having affixed thereto a drive pulley 98 driven by a belt 102 and a drive pulley 100 affixed to a further reduced portion 104 of the shaft extension portion 34.
The detail of the armature 84 and drive gear cone 82 are ; explained in greater detail later in connection with ~ FIGURES 2 and 3.
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' Brake motors of the sliding armature type as used in electric motor 56 and 80 are of a type presently commercially available under the trade mark DEMAG and hence a greatly detailed description of the same is not herein included. However, instead of the usual brake configuration in which deenergization of the motor causes braking of the armature shaft, in the particular application of electric motor 80, a clutching action is created rather than a braking action. Additionally, the motor 80 is advantageously chosen to have two braking elements, one being a frusto conical annulus mounted - around the armature, the other being on the end, as better described in connection with FIGURES 2 and 3.
FIGURE 2 is an enlarged view of the second motor 80 and the drive gear cone 82. The input shaft 96 is shown to drive the drive gear cone 82 through gears 88,90, although obviously many alternate drives between the shaft 96 and the cone 82 could be proposed. The gear cone 82 is mounted to a housing member 100 (preferably a substantial iron casting) by a ball bearing mounting 102.
The armature extension 84 carries a first and a second brake member 104,106. The first brake member 104 serves as a clutch and is a frusto conical annulus extending around the periphery of the armature extension 84. As shown in this view, the second motor 80 is not energized, allowing the brake member 104 to contact the drive gear cone 82 in a clutch relationship to transmit a rotation from the shaft 96 through the gear cone 82 to the armature shaft 78.
A pneumatic cylinder 110 operating a movable braking member 120 is also mounted to the housing member 100, extending through a hole 108 therethrough. The cylinder 110 includes a piston shaft 112 and carries seals ~B ,, ~ , 170-80-0020 Pgt~
114,116. A conduit 118 transmits pressurized air in response to a signal (e.g. via a valve, not shown) to move the piston 112 and the braking member 120 forward toward the armature extension 84. A return spring 119 serves to move the piston 112 rearwardly when the pressurized air is removed.
The braking member 120 includes an annular flat surface 122 positioned to engage the second brake member 106 on the armature extension 84 when the piston 112 is moved forward. The braking member 120 is non rotatably mounted to the housing member 100 through the cylinder 110 .
FIGURE 3 is an enlarged view of the second motor 80 and the cylinder lln carrying the braking member 120, with the cylinder 110 actuated by pressurized air delivered through the conduit 118. The piston 112 has moved forward, compressing the spring 119, to engage the brake 106 with the brake member 120 and move the entire armature extension 8~ fGrwardly. The movement of the armature extension 84 disengages the clutch path between the gear cone 82 and the brake (clutch) 104.
The engagement between the armature extension 84 and the braking member 120 serves to stop the clutch drive through the gear cone 82 and to stop the rotation of the armature extension 84 since the braking member 120 and the cylinder 110 are non rotational. The brake members 104,106 are conventional friction materials adapted to stop rotation and dissipate the energy of rotation in the form of heat. Either asbestos-type or non-asbestos brake lining materials could be chosen for the brake members 104,106.
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Actuation of the piston can be controlled in any of many conventional and well-known methods to generate a control signal. For example, a limit switch engaged by the displacement of the quill could be used. Any other logic element, however, could be substituted to provide a cylinder control signal to a suitable valve, all of which are well known in the art.
While a preferred embodiment of the quill of the present invention has been shown and described in some detail, many modifications and variations are possible without departing from the spirit of the present invention. For example, the pneumatic cylinder could easily be replaced by a hydraulic or electrically actuated member. The transmission shown to couple the two motors could also be interrupted to selectively brake the drive path, especially coupled with a change of the belts to gears. Accordingly, the foregoing description should be considered as merely illustrative of the principles of the present invention and not in limitation thereof, with the invention being described solely by the following claims.
MEc~ANIcAL QUILL HAVING SELECTIVE BRAKING CAPABILITY
TECHNICAL FIE~D
The present invention relates to quill drives or machining units for machine tools. More particularly, the present invention has particular relevance to electrically-powered, mechanically-linked two-speed quill drives.
BACKGROUND ART
U.S. Patent 3,885,635 entitled "Two Speed Mechanical Quill Feed and Spindle Drive Mechanism for a Machine Tool", herein incorporated by reference and sometimes referred to as the "Mechanical Quill Patent", describes a mechanical quill drive system having many similarities to the present invention. In that patent, a quill is advanced by an external screw cooperating with a ball nut having a two speed drive. The two speed drives includes a motor driving the nut directly through gearing during rapid infeed of the quill, but which motor is itself driven through a clutch and reduction gearing by a second motor to produce the slow-speed infeed of the quill and which second motor also rotates the spindle by a driving connection with the splined drive shaft at a reduction during infeed. U.S. Patent 4,000,661 is a division of U.S. Patent 3,885,635.
In some applications for such quill systems, it is desirable to allow the spindle motor to run continuously, without advancing or retracting the spindle. Such spindle operation minimizes the sophistication and cost of the motor controls, but is not possible in the apparatus described in the Mechanical Quill Patent.
.~
:
~ b 170-80-0020 In other applications it is desirable to mount the quill unit with the spindle extending vertically. In such cases the mass of the quill and spindle have a tendency to cause undesirable or downward movement ("drift") of the spindle.
In some applications it is desirable to interrupt the feed stroke for chip breaking or dwelling at the completion of the stroke to assure a good finish of blind holes. The Mechanical Quill Patent cannot conveniently perform this task without substantial modification of the motor controls. Without a dwell capability, an undesirable burr is frequently created in machining.
Other feed mechanisms for quill shafts of a type used in machine tools have been in use for many, many years. While quite satisfactory hydraulic design approaches have existed in the past, current trends are for various reasons dictating a "mechanical" approach to the quill unit drive. Such mechanical drives developed to date have various drawbacks.
One such approach involves a screw actuator disposed parallel to the quill shaft which is rotated at two speeds to provide the two-speed advance of the quill shaft. An example of this design is found in U.S. Patent No. 3,561,544. Another somewhat similar approach common also in single speed drill press type applications has involved a rack or cam drive of the quill shaft; such as shown in U.S. Patent Nos. 2,545,008 and 2,902,891, as well as in German Patent No. 846,807.
These approaches have the common difficulty of excessive runout of the spindle shaft since the feed forces are not aligned with the axis of the motion of the quill shaft. While some attempts to overcome this prob-5 lem have been made by a power screw arrangement concen-tric with the quill shaft as exemplified by U.S. Patent Nos. 2,796,676; 2,975,440; 3,430,524; and 3,139,637, these designs require bearings on a spindle shaft forward of the screw shaft and hence are quite cumbersome, and 10 runout problems may also exist due to the long unsup-ported screw portion overhung at one end of the quill shaft of the mechanism, and also frictional loads may be quite high.
A concentric ball screw advancing mechanism has been described in U.S. Patent No. 3,640,147 which would sub-stantially alleviate the friction loads, but this design provides only a single speed feed motion and the screw portion is, similar to the above examples, overhung at 20 one end of the quill shaft necesssitating a critical bearing adjustment arrangement to control runout.
This particular means for providng a two-speed feed drive previously proposed have also not been without 25 significant drawbacks.
.
A common approach seen in some of the aforementioned patents as well as U.S. Patent No. 3,283,664 has been to provide a pair of motors driving through either a plane-- 30 tary or screw differential gearing. Such gearing is expensive and the controls tend to be quite complex.
~ nother approach is to provide a variable speed commutated motor driven at variable speed, but such motors as compared to constant speed induction motors require more maint,enance (due to the brushes) and require expensive and complex electrical or electronic control systems.
Another approach is shown in U.S. Patent 4,2~1,271 but requires costly controls.
According to the present invention thère is provided a quill unit including a frame, a first motor mounted on a *rame, a second motor mounted on a frame and including an armature and a hollow quill shaft mounted to the frame and driven by a coupling to the second motor. A machining element is rotatably mounted in the hollow quill shaft and is driven by a coupling to the first motor. Drive means is coupled between the first motor and the second motor armature for driving the second motor armature in response to rotation of the first motor when the second motor is not energized, the drive means including a coupling clutch. Means is provided for selectively disengaging the drive means to the second motor armature, means including the armature means for removing the clutch coupling in response to a signal.
It is an advantage of the present invention to provide a reliable two-speed drive with a minimum of gearing and controls which is capable of accurately controlling the point at which the shift to the lower speed infeed is carried out. Other objects and advantages will be apparent to those skilled in this art in view of the following description of the invention of the drawings.
In a specific embodiment of the present invention an pc/ I
' ~ `' ' ;
electrically powered, mechanically coupled quill unit has a selective quill braking capability achieved by a pneumatic cylinder mounted to the motor and adapted to decouple the armature from rotation by a drive cone gear coupled to the spindle motor. The cylinder selectively disengages a clutch drive through the second motor armature by moving the armature axially away from the gear cone to decouple the drive path.
a -..,~
BRIEF DESCRIPTION OF THE DRAWINGS
FIGURE 1 is a partially sectional view of the quill unit of the present invention.
FIGURE 2 is an enlarged cross sectional view of a motor braking arrangement of the present invention, before the motor brake has been applied.
FIGURE 3 is a view of the motor braking arrangement of the present invention with the motor brake applied.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIGURE 1, a mechanical quill unit 10 is depicted in partial section taken along its longitudinal axis, which is adapted to be piloted to a mountiny structure 12.
The quill unit 10 includes a hollow spindle shaft 14 to which a tool or toolholder (not shown) is to be mounted. The spindle shaft 14 is rotatably mounted within a hollow quill shaft 16 so as to be carried along together with the quill shaft 16 during linear movement thereof radial and thrust bearing sets 18 and 20 being provided for this purpose.
The quill shaft 16 is in turn mounted in the unit housing 22 for sliding movement along its longitudinal axis by means of a slidàble fit with two spaced bore surfaces 24 and 26.
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: ~ , The spindle shaft 14 is adapted to be rotated within the quill shaft 16 during machining operations by means of a power shaft 28 having an exteriorly splined portion 30 passing within the spindle shaft 14 and rotatively connected thereto by means of a mating interior spline 32 formed within the spindle shaft 14. It can be seen that this rotative connection will be maintained with relatively linear movement occurring during infeed as will be described herein between the power shaft 28 and the spindle shaft 14 by virtue of this splined connection.
The power shaft 28 is also formed with an extension portion 34 integral with the splined portion 30 and mounted at one end with the quill shaft 16 by means of a thrust and radial load bearing set 36 carried by a sleeve 38 slidable within the quill shaft 16. The bearing set 36 is axially fixed to the extention portion by means of engagement with a shoulder 40 and a retainer 42. The extension portion 34 is supported at the other end in the housing 22 by means of a bearing 44.
The power shaft 28 is rotated by means of a pulley wheel 46 fixed to a reduced end portion 48, the pulley wheel 46 in turn being driven by a belt 50 passing around the pulley wheel and also a smaller pulley wheel 52 affixed to the armature shaft 54 of an electric motor 56.
The quill shaft 16 is adapted to be axially advanced by cam means including a semicircular helical groove 58 formed about its our periphery, this groove cooperating : with a recirculating ball nu~ arrangement 60 which in turn includes a plurality of balls 62, a drive member constituted by a nut 64 rotatively supported in the housing 22 by radial thrust bearings 66 and 68 and surrounding the quill shaft 16, and a ball return 70.
Rotation of the nut 64 which is axially fixed by means of the bearings 66 and 68 thus causes axial advnace of the quill shaft 16 in the same manner as the well known recirculating ball screw machines.
The quill shaft 16 is restrained against rotation in the housing 22 by means of a pair of keys 61, 63 carried in the exterior of the quill shaft 16 sliding in respective longitudinal slots 65, 67 formed in thehousing 22. This arrangement is necessary since the drive of the - nut 62 creates a rotative reaction which if not countered would result in no axial movement of the quill shaft 16.
15The nut 62 is rotated in the housing 22 by means of gear teeth 72 machined into the outer portion of the nut 62, meshing with an idler gear 74 supported in the housing 22 which is in turn driven by a drive pinion 76 fixed to an output shaft 78 driven by a second electric motor 80.
The second electric motor 80 has an armature extension 84 and is of the sliding armature type such : that when it is not energized to drive the pinion 76, clutch means including a drive gear cone 82 is engaged which allows driving of the motor armature extension 84 ~ (and thus the connected armature) and connected output ; shaft 78 by means of a reduction gear 88,90 driven by a shaft 96 having affixed thereto a drive pulley 98 driven by a belt 102 and a drive pulley 100 affixed to a further reduced portion 104 of the shaft extension portion 34.
The detail of the armature 84 and drive gear cone 82 are ; explained in greater detail later in connection with ~ FIGURES 2 and 3.
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' Brake motors of the sliding armature type as used in electric motor 56 and 80 are of a type presently commercially available under the trade mark DEMAG and hence a greatly detailed description of the same is not herein included. However, instead of the usual brake configuration in which deenergization of the motor causes braking of the armature shaft, in the particular application of electric motor 80, a clutching action is created rather than a braking action. Additionally, the motor 80 is advantageously chosen to have two braking elements, one being a frusto conical annulus mounted - around the armature, the other being on the end, as better described in connection with FIGURES 2 and 3.
FIGURE 2 is an enlarged view of the second motor 80 and the drive gear cone 82. The input shaft 96 is shown to drive the drive gear cone 82 through gears 88,90, although obviously many alternate drives between the shaft 96 and the cone 82 could be proposed. The gear cone 82 is mounted to a housing member 100 (preferably a substantial iron casting) by a ball bearing mounting 102.
The armature extension 84 carries a first and a second brake member 104,106. The first brake member 104 serves as a clutch and is a frusto conical annulus extending around the periphery of the armature extension 84. As shown in this view, the second motor 80 is not energized, allowing the brake member 104 to contact the drive gear cone 82 in a clutch relationship to transmit a rotation from the shaft 96 through the gear cone 82 to the armature shaft 78.
A pneumatic cylinder 110 operating a movable braking member 120 is also mounted to the housing member 100, extending through a hole 108 therethrough. The cylinder 110 includes a piston shaft 112 and carries seals ~B ,, ~ , 170-80-0020 Pgt~
114,116. A conduit 118 transmits pressurized air in response to a signal (e.g. via a valve, not shown) to move the piston 112 and the braking member 120 forward toward the armature extension 84. A return spring 119 serves to move the piston 112 rearwardly when the pressurized air is removed.
The braking member 120 includes an annular flat surface 122 positioned to engage the second brake member 106 on the armature extension 84 when the piston 112 is moved forward. The braking member 120 is non rotatably mounted to the housing member 100 through the cylinder 110 .
FIGURE 3 is an enlarged view of the second motor 80 and the cylinder lln carrying the braking member 120, with the cylinder 110 actuated by pressurized air delivered through the conduit 118. The piston 112 has moved forward, compressing the spring 119, to engage the brake 106 with the brake member 120 and move the entire armature extension 8~ fGrwardly. The movement of the armature extension 84 disengages the clutch path between the gear cone 82 and the brake (clutch) 104.
The engagement between the armature extension 84 and the braking member 120 serves to stop the clutch drive through the gear cone 82 and to stop the rotation of the armature extension 84 since the braking member 120 and the cylinder 110 are non rotational. The brake members 104,106 are conventional friction materials adapted to stop rotation and dissipate the energy of rotation in the form of heat. Either asbestos-type or non-asbestos brake lining materials could be chosen for the brake members 104,106.
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Actuation of the piston can be controlled in any of many conventional and well-known methods to generate a control signal. For example, a limit switch engaged by the displacement of the quill could be used. Any other logic element, however, could be substituted to provide a cylinder control signal to a suitable valve, all of which are well known in the art.
While a preferred embodiment of the quill of the present invention has been shown and described in some detail, many modifications and variations are possible without departing from the spirit of the present invention. For example, the pneumatic cylinder could easily be replaced by a hydraulic or electrically actuated member. The transmission shown to couple the two motors could also be interrupted to selectively brake the drive path, especially coupled with a change of the belts to gears. Accordingly, the foregoing description should be considered as merely illustrative of the principles of the present invention and not in limitation thereof, with the invention being described solely by the following claims.
Claims (7)
1. A quill unit comprising:
a frame;
a first motor mounted to said frame;
a second motor mounted to said frame and including an armature;
a hollow quill shaft mounted to said frame and driven by a coupling to said second motor;
a machining element rotatably mounted in said hollow quill shaft and driven by a coupling to said first motor;
drive means coupled between said first motor and said second motor armature for driving said second motor armature in response to rotation of said first motor when said second motor is not energized, said drive means including a clutch coupling;
means for selectively disengaging said drive means to said second motor armature, said means including said armature means for removing said clutch coupling in response to a signal.
a frame;
a first motor mounted to said frame;
a second motor mounted to said frame and including an armature;
a hollow quill shaft mounted to said frame and driven by a coupling to said second motor;
a machining element rotatably mounted in said hollow quill shaft and driven by a coupling to said first motor;
drive means coupled between said first motor and said second motor armature for driving said second motor armature in response to rotation of said first motor when said second motor is not energized, said drive means including a clutch coupling;
means for selectively disengaging said drive means to said second motor armature, said means including said armature means for removing said clutch coupling in response to a signal.
2. A quill drive comprising:
a housing;
a hollow quill shaft;
a drive member rotatably mounted in said housing surrounding said quill shaft and fixed against axial movement;
means mounting said quill shaft in said housing for slidable longitudinal movement along its axis;
a spindle shaft rotatably mounted within said quill shaft and adapted to be carried by said quill shaft with said longitudinal movement;
cam means drivingly connecting said quill shaft and said drive member producing said longitudinal movement of said quill shaft upon rotation of said drive member in said housing;
means for rotating said drive member, said means including:
a first motor, a second motor having an armature and an armature shaft connected to said armature, means drivingly connecting said second motor armature shaft and said drive member, means drivingly connecting said first motor and said spindle shaft so that said spindle shaft is rotated by said first motor, means drivingly connecting said second motor armature shaft and said first motor when said second motor is deenergized whereby said first motor is adapted to rotate said spindle shaft and is also adapted to longitudinally advance said quill shaft through said second motor armature shaft;
the improvement comprising means coupled to the housing for selectively decoupling the drivingly connecting means between said second motor armature shaft and said first motor in response to a control signal.
a housing;
a hollow quill shaft;
a drive member rotatably mounted in said housing surrounding said quill shaft and fixed against axial movement;
means mounting said quill shaft in said housing for slidable longitudinal movement along its axis;
a spindle shaft rotatably mounted within said quill shaft and adapted to be carried by said quill shaft with said longitudinal movement;
cam means drivingly connecting said quill shaft and said drive member producing said longitudinal movement of said quill shaft upon rotation of said drive member in said housing;
means for rotating said drive member, said means including:
a first motor, a second motor having an armature and an armature shaft connected to said armature, means drivingly connecting said second motor armature shaft and said drive member, means drivingly connecting said first motor and said spindle shaft so that said spindle shaft is rotated by said first motor, means drivingly connecting said second motor armature shaft and said first motor when said second motor is deenergized whereby said first motor is adapted to rotate said spindle shaft and is also adapted to longitudinally advance said quill shaft through said second motor armature shaft;
the improvement comprising means coupled to the housing for selectively decoupling the drivingly connecting means between said second motor armature shaft and said first motor in response to a control signal.
3. A quill drive of the type described in Claim 2 wherein said selectively decoupling means comprises a movable mounting of said second motor armature between a first and a second position;
a clutch coupling between said first motor and the second motor only when said second motor armature is in said first position; and means for moving said motor armature to the second position to decouple the motor armature.
a clutch coupling between said first motor and the second motor only when said second motor armature is in said first position; and means for moving said motor armature to the second position to decouple the motor armature.
4. A quill drive of the type described in Claim 3 wherein the moving means comprises a pneumatically actuated piston.
5. A quill drive of the type described in Claim 3 wherein the moving means acts generally along an axis of rotation of the motor armature.
6. A quill drive of the type described in Claim 4 wherein a frictional material is coupled to the armature and the piston carries a portion positioned to engage the friction material when the piston is actuated.
7. A quill drive of the type described in Claim 6 wherein the driven piston brakes rotation of the armature when actuated.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17430280A | 1980-07-31 | 1980-07-31 | |
| US174,302 | 1980-07-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1157686A true CA1157686A (en) | 1983-11-29 |
Family
ID=22635670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000371249A Expired CA1157686A (en) | 1980-07-31 | 1981-02-19 | Mechanical quill having selective braking capability |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5751054A (en) |
| CA (1) | CA1157686A (en) |
| DE (1) | DE3128228A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3500003A1 (en) * | 1985-01-02 | 1985-08-08 | Lieber, Werkzeugmaschinenfabrik, Inh. Elfriede Lieber, 4990 Lübbecke | Spindle-drive component with travelling sleeve for machine tools |
| DE8616485U1 (en) * | 1986-06-20 | 1986-11-06 | Sauter Feinmechanik GmbH, 7430 Metzingen | Spindle head |
| GB8620690D0 (en) * | 1986-08-27 | 1986-10-08 | Desoutter Ltd | Positive feed device |
| DE9101397U1 (en) * | 1991-02-07 | 1991-04-25 | GPA Gesellschaft für Prozeß-Automaten GmbH, 2000 Hamburg | Device for determining wood strength |
| DE4302037C2 (en) * | 1993-01-26 | 1999-01-21 | Alzmetall Werkzeugmasch | Device for controlling the feed of quill-guided main spindles on column drilling machines |
| AU4712096A (en) * | 1995-03-03 | 1996-09-23 | Komet Prazisionswerkzeuge Robert Breuning Gmbh | Positioning drive for use, in particular, in machine tools, and tool head with such a positioning drive |
| DE102016002056A1 (en) | 2015-08-27 | 2017-03-02 | Ehrt Maschinenbau Gmbh | drive unit |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2545008A (en) * | 1944-12-22 | 1951-03-13 | Genevoise Instr Physique | Machine tool spindle drive and feed control device |
| DE846807C (en) * | 1950-11-26 | 1952-08-18 | Bergische Achsen Kotz Soehne | Feed device of a horizontal drilling machine with, in particular, several drilling spindles |
| US2796676A (en) * | 1954-09-29 | 1957-06-25 | Spero Michael Polios | Level and inclination determining device |
| US2902891A (en) * | 1954-11-04 | 1959-09-08 | Honsberg Geb | Boring unit |
| GB854533A (en) * | 1958-03-25 | 1960-11-23 | Wickman Ltd | Feed mechanisms of the screw type for machine tools |
| DE1300417B (en) * | 1959-09-24 | 1969-07-31 | Froriep Gmbh Maschf | Boring mill or the like with a hollow drilling spindle slidably mounted in the main spindle |
| US3283664A (en) * | 1965-03-09 | 1966-11-08 | Cross Co | Feed and drive unit for a machine tool |
| GB1052472A (en) * | 1965-09-09 | |||
| FR2032959A5 (en) * | 1969-03-03 | 1970-11-27 | Olivetti & Co Spa | |
| US3561544A (en) * | 1969-12-05 | 1971-02-09 | Buhr Machine Tool Corp | Parallel shaft driven machine tool way or quill unit |
| US3885635A (en) * | 1974-04-19 | 1975-05-27 | Bendix Corp | Two-speed mechanical quill feed and spindle drive mechanism for a machine tool |
| JPS5554109Y2 (en) * | 1976-02-18 | 1980-12-15 | ||
| US4201271A (en) * | 1978-07-10 | 1980-05-06 | Larry Evans | Quill drive with variable feed |
-
1981
- 1981-02-19 CA CA000371249A patent/CA1157686A/en not_active Expired
- 1981-07-16 DE DE19813128228 patent/DE3128228A1/en active Granted
- 1981-07-31 JP JP12060681A patent/JPS5751054A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5751054A (en) | 1982-03-25 |
| DE3128228A1 (en) | 1982-05-13 |
| DE3128228C2 (en) | 1990-06-21 |
| JPH0135227B2 (en) | 1989-07-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |