CA2064127A1 - Internal print drum drive - Google Patents
Internal print drum driveInfo
- Publication number
- CA2064127A1 CA2064127A1 CA 2064127 CA2064127A CA2064127A1 CA 2064127 A1 CA2064127 A1 CA 2064127A1 CA 2064127 CA2064127 CA 2064127 CA 2064127 A CA2064127 A CA 2064127A CA 2064127 A1 CA2064127 A1 CA 2064127A1
- Authority
- CA
- Canada
- Prior art keywords
- rotating drum
- stator
- permanent magnet
- drive means
- 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.)
- Abandoned
Links
- 238000004804 winding Methods 0.000 abstract description 7
- 230000005355 Hall effect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012358 sourcing Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
- B41J1/22—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection
- B41J1/32—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection the plane of the type or die face being parallel to the axis of rotation, e.g. with type on the periphery of cylindrical carriers
- B41J1/34—Carriers rotating during impression
Landscapes
- Common Mechanisms (AREA)
Abstract
INTERNAL PRINT DRUM DRIVE
Abstract of the Disclosure A rotating drum-type printer has an electric motor which is internal to the print drum. Using the components of a brushless, direct current (d.c.) motor, the stator windings are attached to a stationary shaft, while the permanent magnet rotor is attached to the inside wall of the print drum.
Abstract of the Disclosure A rotating drum-type printer has an electric motor which is internal to the print drum. Using the components of a brushless, direct current (d.c.) motor, the stator windings are attached to a stationary shaft, while the permanent magnet rotor is attached to the inside wall of the print drum.
Description
: - , 2064~27 INTERNAL PRINT DRUM DRIVE
Field of the Invention The present invention generally relates to machines which have rotating drum-like members. More particularly, the present invention relates to a method and apparatus for driving the print drum in a print drum-type printer.
Brief Description of the Drawings The following is a brief description of the drawing figures referred to in the specification of this letters patent.
Figure 1 is an end view of a rotating drum printer of the the type compatible with the teachings of the present invention, and shows a print drum, paper/print medium, an ink ribbon, and a printing hammer bank.
Figure 2 is an isometric view of a prior art print drum drive arrangement using a belt and pulleys to drive the print drum.
Figure 3 is an isometric view of a prior art print drum drive arrangement using a belt, pulleys and gears to drive the print drum.
Figure 4 is a cut-away view of the print drum and print drum drive of the present invention.
~ackground of the Invention Rotating drum printers such as the one 100 in Figure 1, employ a rotating drum 102 with printing characters permanently affixed to the drum's outside surface. There is a circumferential column of printing characters on the print drum for each possible printing position along a print line.
Printing paper 106 is placed in between an ink ribbon 104 and a bank of printing hammers or print actuating means 107 (one hammer for each possible printing position).
- :. - . - ' - . ~ .
Field of the Invention The present invention generally relates to machines which have rotating drum-like members. More particularly, the present invention relates to a method and apparatus for driving the print drum in a print drum-type printer.
Brief Description of the Drawings The following is a brief description of the drawing figures referred to in the specification of this letters patent.
Figure 1 is an end view of a rotating drum printer of the the type compatible with the teachings of the present invention, and shows a print drum, paper/print medium, an ink ribbon, and a printing hammer bank.
Figure 2 is an isometric view of a prior art print drum drive arrangement using a belt and pulleys to drive the print drum.
Figure 3 is an isometric view of a prior art print drum drive arrangement using a belt, pulleys and gears to drive the print drum.
Figure 4 is a cut-away view of the print drum and print drum drive of the present invention.
~ackground of the Invention Rotating drum printers such as the one 100 in Figure 1, employ a rotating drum 102 with printing characters permanently affixed to the drum's outside surface. There is a circumferential column of printing characters on the print drum for each possible printing position along a print line.
Printing paper 106 is placed in between an ink ribbon 104 and a bank of printing hammers or print actuating means 107 (one hammer for each possible printing position).
- :. - . - ' - . ~ .
2~64127 The hammer bank 107 has for each printing position, a hammer tip 108, a hammer frame 110 and a hammer flag assembly 112, which function together to activate the hammer tips 108 in a manner well known in the art. During printing, selected printing hammer tips 108 are made to strike the paper 106, forcing it and the ink ribbon 104 against the print drum 102, thus transferring ink from the ink ribbon 104 to the paper 106 in the form of a character.
Prior art rotating drum printers typically drive the print drum 102 using either of the arrangements illustrated in Figures 2 or 3. In the arrangement of Figure 2, an external electric motor 202 transfers torque via two pulleys (204 and 208) and a belt 206 to the print drum 102. rn the arrangement of Figure 3, the electric motor 202 is coupled to a pulley 306 via gears 302 and a shaft 304. The pulley 306 drives a belt 308 which drives another pulley 310.
The pulley 310 turns a shaft which rotates the print drum 102.
As a result of prior art drive methods, rotating drum printers are not as efficient, nor as compact, nor as reliable as is desired. Further, production costs and product life are often unsatisfactory. Additionally, the use of belts, pulleys and gears often leads to mechanical coupling backlash, which may adversely affect character alignment on the printing paper.
Summarv of the Invention In view of the above, it is a first object of the present invention to provide a rotating drum machine with an efficient means of driving the rotating drum.
It is a second object of the present invention to provide a rotating drum machine with reduced space reguirements for the rotating drum and its drive means.
~:,,""~,-",'"~
, . ,~, ~
206~127 It i9 a third object of the present invention to provide a rotating drum machine which the rotating drum drive means is void of mechanical drive components such as belts, pulleys, shafts and gears.
It is a fourth object of the present invention to provide a rotating drum machine which has high reliability.
It is a fifth object of the present invention to provide a rotating drum machine which has longer product life.
It is a sixth object of the present invention to provide a rotating drum machine with an inexpensive rotating drum drive.
~ t is a seventh object of the present invention to provide a rotating drum machine which eliminates mechanical coupling backlash between the rotating drum and the drive means.
There is provided in accordance with the present invention, a rotating drum apparatus which at least includes:
a stationary shaft; and a rotating drum including an internal electro-mechanical drive means, wherein the internal mechanical drive means includes:
a stator connected to the stationary shaft: and a permanent magnet rotor connected to an inside surface of the rotating drum;
wherein the stator is controllably energizable to cause the permanent magnet rotor, and hence the rotating drum, to rotate with respect to the stator.
There is further provided in accordance with the present invention, a rotating drum printer which at least includes:
a rotating drum having printing characters on its outer surface, the rotating drum including an internal drive means;
,. - .
.
`` 20~127 ink storage ribbon for storing printing ink; and a plurality of print actuating means eor selectively displacing a print medium to cause the print medium to simultaneously strike the print drum and the ink storage ribbon to print characters.
The details of the present invention will be revealed in the following description, with primary reference to drawing Figures 1 and 4.
Description of the Preferred Embodiment The present invention satisfies the objects identified above, by locating the drive means in the interior of a print drum 402 (see Figure 4), which functions in the place of the print drum 102 in Figure 1. The drive means utilizes the major components of a prior art brushless, direct current (d.c.) electric motor in the inventive way described below.
The print drum 402 is rotatably connected to a fixed or stationary shaft 404. Shaft bearings 406 reduce friction during rotation of the print drum 402, and are pre-loaded by a bias spring 408, which pushes the print drum leftward in Figure 4 against a locating surface (not shown). The bias spring 408 is supported at its right end by a stop 409 on the stationary shaft 404.
A stator 410 with a number of windings is attached to the stationary shaft 404 as shown. A
rotor 412 including several permanent magnets is adhesively attached to the inside wall of the print drum 402 as shown, leaving only a small clearance between it and the stator windings. Hall effect sensors 414 which are mounted on a circuit board 416 r monitor the movement of the permanent magnet rotor, and output motion indicating signals to commutation logic control circuitry on the circuit board.
, ,~ ~,....
206~127 The commutation logic control circuitry determines the precise currents ~commutation logic) to be applied to the drive windings of the stator 410 in response to the output signals of the Hall effect sensors 414 in a manner well known in the art. Power is supplied to the drive windings of the stator 410 directly from the circuit board 416.
Two side frames (not shown) are attached to both sides of of the print drum 402, and also to the sides of the hammer frame 110, to correctly align the printing hammers 108 with their respective printing positions along the print drum 402.
In operation, the Hall effect sensors 414 send rotor position information signals to the control circuitry on the circuit board 416. The control circuitry determines the correct current sourcing for the drive windings (of the stator 410) needed to rotate the print drum at a given speed. As the drive windings are energized, the permanent magnet rotor 412 turns in response to the controlled magnetic fields produced. Since the rotor 412 is glued to the print drum, the print drum rota-es simultaneously with the rotor.
Thus, a rotating drum printer has been described in which: 1) the drive means of the print drum is entirely internal; and 2) the print drum is integrated with the components of the drive means.
Variations and modifications to the present invention are possible given the above disclosure.
However, such variations and modifications are intended to be within the scope of the invention claimed by this letters patent. ~or example, the present invention is not restricted to printers, and may be adapted for use in other machines employing rotating drums or the like. Also, the drive means need not be limited to components of brushless, d.c.
motors, and can therefore utilize the components of other types of motors, as well.
Prior art rotating drum printers typically drive the print drum 102 using either of the arrangements illustrated in Figures 2 or 3. In the arrangement of Figure 2, an external electric motor 202 transfers torque via two pulleys (204 and 208) and a belt 206 to the print drum 102. rn the arrangement of Figure 3, the electric motor 202 is coupled to a pulley 306 via gears 302 and a shaft 304. The pulley 306 drives a belt 308 which drives another pulley 310.
The pulley 310 turns a shaft which rotates the print drum 102.
As a result of prior art drive methods, rotating drum printers are not as efficient, nor as compact, nor as reliable as is desired. Further, production costs and product life are often unsatisfactory. Additionally, the use of belts, pulleys and gears often leads to mechanical coupling backlash, which may adversely affect character alignment on the printing paper.
Summarv of the Invention In view of the above, it is a first object of the present invention to provide a rotating drum machine with an efficient means of driving the rotating drum.
It is a second object of the present invention to provide a rotating drum machine with reduced space reguirements for the rotating drum and its drive means.
~:,,""~,-",'"~
, . ,~, ~
206~127 It i9 a third object of the present invention to provide a rotating drum machine which the rotating drum drive means is void of mechanical drive components such as belts, pulleys, shafts and gears.
It is a fourth object of the present invention to provide a rotating drum machine which has high reliability.
It is a fifth object of the present invention to provide a rotating drum machine which has longer product life.
It is a sixth object of the present invention to provide a rotating drum machine with an inexpensive rotating drum drive.
~ t is a seventh object of the present invention to provide a rotating drum machine which eliminates mechanical coupling backlash between the rotating drum and the drive means.
There is provided in accordance with the present invention, a rotating drum apparatus which at least includes:
a stationary shaft; and a rotating drum including an internal electro-mechanical drive means, wherein the internal mechanical drive means includes:
a stator connected to the stationary shaft: and a permanent magnet rotor connected to an inside surface of the rotating drum;
wherein the stator is controllably energizable to cause the permanent magnet rotor, and hence the rotating drum, to rotate with respect to the stator.
There is further provided in accordance with the present invention, a rotating drum printer which at least includes:
a rotating drum having printing characters on its outer surface, the rotating drum including an internal drive means;
,. - .
.
`` 20~127 ink storage ribbon for storing printing ink; and a plurality of print actuating means eor selectively displacing a print medium to cause the print medium to simultaneously strike the print drum and the ink storage ribbon to print characters.
The details of the present invention will be revealed in the following description, with primary reference to drawing Figures 1 and 4.
Description of the Preferred Embodiment The present invention satisfies the objects identified above, by locating the drive means in the interior of a print drum 402 (see Figure 4), which functions in the place of the print drum 102 in Figure 1. The drive means utilizes the major components of a prior art brushless, direct current (d.c.) electric motor in the inventive way described below.
The print drum 402 is rotatably connected to a fixed or stationary shaft 404. Shaft bearings 406 reduce friction during rotation of the print drum 402, and are pre-loaded by a bias spring 408, which pushes the print drum leftward in Figure 4 against a locating surface (not shown). The bias spring 408 is supported at its right end by a stop 409 on the stationary shaft 404.
A stator 410 with a number of windings is attached to the stationary shaft 404 as shown. A
rotor 412 including several permanent magnets is adhesively attached to the inside wall of the print drum 402 as shown, leaving only a small clearance between it and the stator windings. Hall effect sensors 414 which are mounted on a circuit board 416 r monitor the movement of the permanent magnet rotor, and output motion indicating signals to commutation logic control circuitry on the circuit board.
, ,~ ~,....
206~127 The commutation logic control circuitry determines the precise currents ~commutation logic) to be applied to the drive windings of the stator 410 in response to the output signals of the Hall effect sensors 414 in a manner well known in the art. Power is supplied to the drive windings of the stator 410 directly from the circuit board 416.
Two side frames (not shown) are attached to both sides of of the print drum 402, and also to the sides of the hammer frame 110, to correctly align the printing hammers 108 with their respective printing positions along the print drum 402.
In operation, the Hall effect sensors 414 send rotor position information signals to the control circuitry on the circuit board 416. The control circuitry determines the correct current sourcing for the drive windings (of the stator 410) needed to rotate the print drum at a given speed. As the drive windings are energized, the permanent magnet rotor 412 turns in response to the controlled magnetic fields produced. Since the rotor 412 is glued to the print drum, the print drum rota-es simultaneously with the rotor.
Thus, a rotating drum printer has been described in which: 1) the drive means of the print drum is entirely internal; and 2) the print drum is integrated with the components of the drive means.
Variations and modifications to the present invention are possible given the above disclosure.
However, such variations and modifications are intended to be within the scope of the invention claimed by this letters patent. ~or example, the present invention is not restricted to printers, and may be adapted for use in other machines employing rotating drums or the like. Also, the drive means need not be limited to components of brushless, d.c.
motors, and can therefore utilize the components of other types of motors, as well.
Claims (9)
1. A rotating drum apparatus comprising:
a stationary shaft; and a rotating drum comprising an internal electro-mechanical drive means, wherein said internal mechanical drive means comprises:
a stator coupled to said stationary shaft; and a permanent magnet rotor connected to an inside surface of said rotating drum;
wherein said stator is controllably energizable to cause said permanent magnet rotor, and hence said rotating drum, to rotate with respect to said stator.
a stationary shaft; and a rotating drum comprising an internal electro-mechanical drive means, wherein said internal mechanical drive means comprises:
a stator coupled to said stationary shaft; and a permanent magnet rotor connected to an inside surface of said rotating drum;
wherein said stator is controllably energizable to cause said permanent magnet rotor, and hence said rotating drum, to rotate with respect to said stator.
2. The rotating drum apparatus in claim 1 further comprising:
position sensor means for indicating movement of said permanent magnet rotor and outputting signals corresponding to said movement.
position sensor means for indicating movement of said permanent magnet rotor and outputting signals corresponding to said movement.
3. The rotating drum apparatus in claim 2 wherein said position sensor means comprises Hall sensors.
4. The rotating drum printer in claim 3 wherein said internal electro-mechanical drive means is of the brushless, direct current type.
5. A rotating drum printer comprising:
a rotating drum having printing characters on its outer surface, said rotating drum comprising an internal drive means;
ink storage ribbon for storing printing ink; and a plurality of print actuating means for selectively displacing a print medium to cause said print medium to simultaneously strike said print drum and said ink storage ribbon to print characters.
a rotating drum having printing characters on its outer surface, said rotating drum comprising an internal drive means;
ink storage ribbon for storing printing ink; and a plurality of print actuating means for selectively displacing a print medium to cause said print medium to simultaneously strike said print drum and said ink storage ribbon to print characters.
6. The rotating drum printer in claim 5 further comprising:
a stationary shaft;
wherein said internal drive means comprises:
a stator coupled to said stationary shaft; and a permanent magnet rotor coupled to an inside surface of said rotating drum;
wherein said stator is controllably energizable to cause said permanent magnet rotor, and hence said rotating drum, to rotate with respect to said stator.
a stationary shaft;
wherein said internal drive means comprises:
a stator coupled to said stationary shaft; and a permanent magnet rotor coupled to an inside surface of said rotating drum;
wherein said stator is controllably energizable to cause said permanent magnet rotor, and hence said rotating drum, to rotate with respect to said stator.
7. The rotating drum printer in claim 6 further comprising:
position sensor means for indicating movement of said permanent magnet rotor and outputting signals corresponding to said movement.
position sensor means for indicating movement of said permanent magnet rotor and outputting signals corresponding to said movement.
8. The rotating drum printer in claim 7 wherein said position sensor means comprises Hall sensors.
9. The rotating drum printer in claim 8 wherein said internal drive means is of the brushless, direct current type.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US75447691A | 1991-09-03 | 1991-09-03 | |
| US754,476 | 1991-09-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2064127A1 true CA2064127A1 (en) | 1993-03-04 |
Family
ID=25034960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2064127 Abandoned CA2064127A1 (en) | 1991-09-03 | 1992-03-26 | Internal print drum drive |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0531049A1 (en) |
| CA (1) | CA2064127A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT227706Y1 (en) * | 1992-12-18 | 1997-12-15 | Bianco Spa | CYLINDER FOR TEXTILE MACHINE WITH BUILT-IN MOTOR |
| IT1265863B1 (en) * | 1993-03-12 | 1996-12-12 | Biancalani & C Off Mec | MACHINE FOR TREATMENT OF FABRIC IN ROPE, WITH INCORPORATING ELECTRIC DRIVE MOTORS, FOR MILLING AND FOR OTHER OPERATIONS. |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4818924U (en) * | 1971-07-14 | 1973-03-03 | ||
| DE3331194A1 (en) * | 1983-08-30 | 1985-03-07 | Ebm Elektrobau Mulfingen Gmbh & Co, 7119 Mulfingen | COLLECTORLESS DC MOTOR WITH TRIANGULAR, UNSENSED STATOR WINDING |
-
1992
- 1992-03-26 CA CA 2064127 patent/CA2064127A1/en not_active Abandoned
- 1992-08-27 EP EP92307810A patent/EP0531049A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP0531049A1 (en) | 1993-03-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |