CA1155295A - Reversing mechanism for curtain type route indicator - Google Patents
Reversing mechanism for curtain type route indicatorInfo
- Publication number
- CA1155295A CA1155295A CA000373709A CA373709A CA1155295A CA 1155295 A CA1155295 A CA 1155295A CA 000373709 A CA000373709 A CA 000373709A CA 373709 A CA373709 A CA 373709A CA 1155295 A CA1155295 A CA 1155295A
- Authority
- CA
- Canada
- Prior art keywords
- gear
- curtain
- shaft
- roll
- helical
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F11/00—Indicating arrangements for variable information in which the complete information is permanently attached to a movable support which brings it to the display position
- G09F11/24—Indicating arrangements for variable information in which the complete information is permanently attached to a movable support which brings it to the display position the advertising or display material forming part of a moving band, e.g. in the form of perforations, prints, or transparencies
- G09F11/29—Indicating arrangements for variable information in which the complete information is permanently attached to a movable support which brings it to the display position the advertising or display material forming part of a moving band, e.g. in the form of perforations, prints, or transparencies of a band other than endless
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Curtains And Furnishings For Windows Or Doors (AREA)
- Displays For Variable Information Using Movable Means (AREA)
Abstract
Reversing Mechanism for Curtain Type Route Indicator ABSTRACT
A helical driver gear is rotatable on a shaft driven by a reversable electric motor. The gear has a pair of helical gear followers attached to an arm freely rotatable on the driver gear shaft and adjacent the driver gear and in eccentric mounting there-with thereby to effect alternative engagement with either of two other helical gears, each mounted on the end of spaced apart curtain roll shafts which are parallel and equidistant from the drive shaft, instantaneously with change of torque of the driver shaft. The route indicator curtain can be controlled electrically and driven at high speeds without damage as each roll becomes a driver at the same instant the other becomes a free follower.
A helical driver gear is rotatable on a shaft driven by a reversable electric motor. The gear has a pair of helical gear followers attached to an arm freely rotatable on the driver gear shaft and adjacent the driver gear and in eccentric mounting there-with thereby to effect alternative engagement with either of two other helical gears, each mounted on the end of spaced apart curtain roll shafts which are parallel and equidistant from the drive shaft, instantaneously with change of torque of the driver shaft. The route indicator curtain can be controlled electrically and driven at high speeds without damage as each roll becomes a driver at the same instant the other becomes a free follower.
Description
1~5529S
Reversing Mechanism for Curtain Type Route Indicator FIELD OF INVE~TION
The present invention relates to a helical gear mechanism driven by a reversing electric motor source of power, which can provide a smooth, fast transfer of power from one roll of a curtain type route sign to the roll at the other end of the curtain when an operator requires the curtain to be reveresed while he seeks out a change of route sign on the curtain for display on the front of a bus or the like. In particular the invention herein comprises a helical gear rotatable on a shaft powered by a reversing motor and spaced apart fr~m¦
and between a pair of helical gears, each of which is adapted to rotate¦
the curtain of a destination sign in one of two directions of rotation.
An arm plate member is rotatable on the power shaft adjacent the gear thereon and has ends which extend beyond the perlphery of the gear , and carries on each end in freely rotatable mode another helical gear in eccentric relation to the main driving helical gear. The gears are spaced in a planar relation to allow the power from the driving gear to be transmitted to the curtain roll gears through the gears on the arm plate which are thrown in and out of engagement with their adjacent roll gears by the change of torque of the driving gear instantaneously with the reversing of the power shaft to the driving gear~
PRIOR ART
It is known to drive destination signs carried on fabric or plastic curtains by drive rolls spaced apart from one another and using revers-ing motor means with clutch mechanisms to alternately cause one or other of the rolls to be the driver and the other to be a free follower. It is also known that the reversal of the curtain must be done smoothly to avoid rupture of the fabric. Where destination signs are driven by high speed motors controlled by electronic sensors to scan a large number of ~2-:1 displays and to be reversed often and quickly it is found that the commonly used means of reversing the rolls is too slow in relation to the desired movement of the curtain and the control logic provided.
The need for a means for reversing the rolls on a destination sign quickly and easily is now demanded by operators of buses where upwards of one hundred different displays are available and controlled by senso-rs at the displays which are selected by electronic means by the operat-or rather than by manual and human optical selection as heretofore.
It is also known that the engagement and disengagement of helical gears is effected more gently and with possible higher peripheral veloc-ities than other common gears and that helical gears wear less than other types of gears.
Objects of the Invention The principal object of the invention is to employ helical gears to facilitate smooth and gentle reversal of the drive function in a curtain type destination sign from one roll shaft to another between which the curtain is wound. The object is achieved by positioning a helical driver gear on a shaft driven by a reversing motor and having a -pair of helical gears eccentrically mounted for free movement on the shaft and driven b~ the driver gear. The follower gears eccentrically mounted as above are positioned to alternately engage and disengage with helical driver gears mounted on the ends of the drive shafts of the curtain of the destination sign~ The quick response of the helical driver gear to disengage one gear and engage the other simultaneously with its change of torque allows a bus operator to reverse the destnat-ion sign from high speed in one direction to high speed in the other without destruction of the fabric of the curtain or uneven or jerk~
movement of the curtain.
Summary of the Invention A destination sign curtain is spaced between two roll shafts each of which is capable of being a roll winder while the other is a free ollower and vice versa. Adjacent spaced apart ends of the two shafts ~ ~5529~
have helical drive gears fixed thereon to wind the curtain into a rollon the particular shaft gear to which rotating power is applied. When a roll shaft is not being rotated by its shaft it is free to revolve and free the curtain wound on it when the curtain is being wound onto the other roll shaft by application of rotating force on the other gear. The gears are in the same plane as one another and spaced apart from a centr-al driving helical gear which is driven by a shaft reversibly driven by a source of rotating power such as an electric motor. A rocker plate arm is mounted in a bronze bushing rotatable on the drive shaft adjacent the driver helical gear and has end portions extending outwards of the peri-pheral tooth edge of the driver gear to overlie the gear and in parallel therewith. A helical gear follower is rotatable in a bronze bushing on each of the ends of the rocker arm and each gear is adapted to engage and intermesh with the driver gear. The follower gears on the rocker arm are eccentrically mounted in relation to the axis of the drive gear such that only one of them is a~ially rotata~le in parallel with a roll shaft gear and the drive gear at the same time.
When the torque of the drive gear is changed by the reversal of its shaft the rocker arm overbalances instantly thereby throwing the one of the follower gears out of mesh with one shaft gear on the one roll and throws the other follower gear into mesh and power transfer mode with the other curtain roll shaft gear. The four gears are spaced apart to allow onl~ one follower gear to be engageable at one time with a small clear-ance between the free follower and the free roll shaft gear. Stop means are fixed to the curtain frame adjacent the rocker arm to prevent the follower gear from being driven out of mesh with the roll shaft gear to which rotatin~ power is intended to be transfered by the drive gear th-rough the follower gear.
;
In The Drawings With the foregoing objects in view and such other objects that become apparent from consideration of this disclosure, the present inv-ention consists of the inventive concept which is comprised, embodied 1~552g5 and included in the construction method and combination of parts he~ein exemplified reference being had to the accompanying drawings in which like reference numerals refer to like parts.
Fi~ 1. is a perspective view of the end of a curtain type route sign showing the helical gear driving and reversing mechanism of the invent ion.
The Preferred Embodiement of the Invention In the drawings numeral 10 designates a destination route indicator of the curtain display type where 12 is a plastic or fabric curtain having destination names or numbers printed thereon for display toward the front of a bus or the like vehicle. The curtain 12 is enclosed in a frame 15 attachable to the cavity provided in the top front of the bus and is adapted to be carried over a cagework onto and off of a pair of rotatable rolls 13,14. Each roll shaft 13, 14 is rotatable in either direction to wind the curtain onto it or to allow the curtain to be freely wound off by the other roll.
A reversible electric motor 16 is fixed to frame 15 and rotates a shaft 17 which drives reduction gears 18,19. Gear 19 is fixed to drive shaft 20 and is capable of driving the shaft in either direction of rotation. Drive shaft 20 is positioned midway between and in the plane of and axially parallel with the drive rolls 13,14. A helical gear 21 is fixed to the shaft 20 and is thereby rotatable therewith in either direction. A helical gear 22 is fixed to roll 13 and a helical gear 23 is fixed to shaft 14. Gears 21,22,23, are parallel with one another but do not intermesh directly. It is the object of the invention to have a pair of gear followers 25,2~ freely rotatable in bronze bushings 31, ~ nd to 32, on a rocker arm plate 27,~alternately mesh with the roll shaft gears to transfer the rotational force of driver gear 21 to the driven rolls and thereby wind the curtain 15.
~ ocker arm plate 27 is freely rotatable in a bronze bushing on shaft 30 and is set bet~een gear 21 and the end of frame 15. Stop means 28,29 are fixed to the frame 15 to limit thedownward travel of the arm 27 when the torque of rotating drive gear 21 dxives one of the follower -`- 3.155~
are mounted gears 25,26. The helical follower gears /eccentrically with one another and the drive gear 21 to insure that only one of them will be able to engage a roll gear at the same time. Upon rotation of the gear 21 each of gears 25,26 are freely driven but due to the configuration of the arm 27 and the spacing of the roll gears 22,23,only one of the rotating gear followers 25,26, will be capable of transmitting motion at any one time.
Operation of the Invention In the drawing shown,the shaft 30 is being rotated in a counter-clockwise direction carrying the driver gear in the same direction. The motion is being transferred to follower 25 which rotates in the opposite direction but is prevented from traveling out of mesh by the stoppl~g of the arm 27 by pin stop 28. The rotation force is thereby transferred to gear 22 which becomes counter-clockwise to wind the curtain 12 onto roll 13 as required. With the gear 26 eccentrically mounted on the arm 27 in relation to the alignment of gears 21,25, the motor 16 is rever-sed by the operator control or sensor means (not shown) which cawses reversing of the gear 21 and creates a torque force along the line of the shaft 30 and bushing 32 thereby overbalancing arm 27. The torque motion instantaneously pulls the gear 25 out of engagement with the gear 22 and causes the gear 26 to engage gear 23 thereby transferring motion to shaft 14 and winding the curtain 12 in a clockwise direction as required.
' 6 ~
Reversing Mechanism for Curtain Type Route Indicator FIELD OF INVE~TION
The present invention relates to a helical gear mechanism driven by a reversing electric motor source of power, which can provide a smooth, fast transfer of power from one roll of a curtain type route sign to the roll at the other end of the curtain when an operator requires the curtain to be reveresed while he seeks out a change of route sign on the curtain for display on the front of a bus or the like. In particular the invention herein comprises a helical gear rotatable on a shaft powered by a reversing motor and spaced apart fr~m¦
and between a pair of helical gears, each of which is adapted to rotate¦
the curtain of a destination sign in one of two directions of rotation.
An arm plate member is rotatable on the power shaft adjacent the gear thereon and has ends which extend beyond the perlphery of the gear , and carries on each end in freely rotatable mode another helical gear in eccentric relation to the main driving helical gear. The gears are spaced in a planar relation to allow the power from the driving gear to be transmitted to the curtain roll gears through the gears on the arm plate which are thrown in and out of engagement with their adjacent roll gears by the change of torque of the driving gear instantaneously with the reversing of the power shaft to the driving gear~
PRIOR ART
It is known to drive destination signs carried on fabric or plastic curtains by drive rolls spaced apart from one another and using revers-ing motor means with clutch mechanisms to alternately cause one or other of the rolls to be the driver and the other to be a free follower. It is also known that the reversal of the curtain must be done smoothly to avoid rupture of the fabric. Where destination signs are driven by high speed motors controlled by electronic sensors to scan a large number of ~2-:1 displays and to be reversed often and quickly it is found that the commonly used means of reversing the rolls is too slow in relation to the desired movement of the curtain and the control logic provided.
The need for a means for reversing the rolls on a destination sign quickly and easily is now demanded by operators of buses where upwards of one hundred different displays are available and controlled by senso-rs at the displays which are selected by electronic means by the operat-or rather than by manual and human optical selection as heretofore.
It is also known that the engagement and disengagement of helical gears is effected more gently and with possible higher peripheral veloc-ities than other common gears and that helical gears wear less than other types of gears.
Objects of the Invention The principal object of the invention is to employ helical gears to facilitate smooth and gentle reversal of the drive function in a curtain type destination sign from one roll shaft to another between which the curtain is wound. The object is achieved by positioning a helical driver gear on a shaft driven by a reversing motor and having a -pair of helical gears eccentrically mounted for free movement on the shaft and driven b~ the driver gear. The follower gears eccentrically mounted as above are positioned to alternately engage and disengage with helical driver gears mounted on the ends of the drive shafts of the curtain of the destination sign~ The quick response of the helical driver gear to disengage one gear and engage the other simultaneously with its change of torque allows a bus operator to reverse the destnat-ion sign from high speed in one direction to high speed in the other without destruction of the fabric of the curtain or uneven or jerk~
movement of the curtain.
Summary of the Invention A destination sign curtain is spaced between two roll shafts each of which is capable of being a roll winder while the other is a free ollower and vice versa. Adjacent spaced apart ends of the two shafts ~ ~5529~
have helical drive gears fixed thereon to wind the curtain into a rollon the particular shaft gear to which rotating power is applied. When a roll shaft is not being rotated by its shaft it is free to revolve and free the curtain wound on it when the curtain is being wound onto the other roll shaft by application of rotating force on the other gear. The gears are in the same plane as one another and spaced apart from a centr-al driving helical gear which is driven by a shaft reversibly driven by a source of rotating power such as an electric motor. A rocker plate arm is mounted in a bronze bushing rotatable on the drive shaft adjacent the driver helical gear and has end portions extending outwards of the peri-pheral tooth edge of the driver gear to overlie the gear and in parallel therewith. A helical gear follower is rotatable in a bronze bushing on each of the ends of the rocker arm and each gear is adapted to engage and intermesh with the driver gear. The follower gears on the rocker arm are eccentrically mounted in relation to the axis of the drive gear such that only one of them is a~ially rotata~le in parallel with a roll shaft gear and the drive gear at the same time.
When the torque of the drive gear is changed by the reversal of its shaft the rocker arm overbalances instantly thereby throwing the one of the follower gears out of mesh with one shaft gear on the one roll and throws the other follower gear into mesh and power transfer mode with the other curtain roll shaft gear. The four gears are spaced apart to allow onl~ one follower gear to be engageable at one time with a small clear-ance between the free follower and the free roll shaft gear. Stop means are fixed to the curtain frame adjacent the rocker arm to prevent the follower gear from being driven out of mesh with the roll shaft gear to which rotatin~ power is intended to be transfered by the drive gear th-rough the follower gear.
;
In The Drawings With the foregoing objects in view and such other objects that become apparent from consideration of this disclosure, the present inv-ention consists of the inventive concept which is comprised, embodied 1~552g5 and included in the construction method and combination of parts he~ein exemplified reference being had to the accompanying drawings in which like reference numerals refer to like parts.
Fi~ 1. is a perspective view of the end of a curtain type route sign showing the helical gear driving and reversing mechanism of the invent ion.
The Preferred Embodiement of the Invention In the drawings numeral 10 designates a destination route indicator of the curtain display type where 12 is a plastic or fabric curtain having destination names or numbers printed thereon for display toward the front of a bus or the like vehicle. The curtain 12 is enclosed in a frame 15 attachable to the cavity provided in the top front of the bus and is adapted to be carried over a cagework onto and off of a pair of rotatable rolls 13,14. Each roll shaft 13, 14 is rotatable in either direction to wind the curtain onto it or to allow the curtain to be freely wound off by the other roll.
A reversible electric motor 16 is fixed to frame 15 and rotates a shaft 17 which drives reduction gears 18,19. Gear 19 is fixed to drive shaft 20 and is capable of driving the shaft in either direction of rotation. Drive shaft 20 is positioned midway between and in the plane of and axially parallel with the drive rolls 13,14. A helical gear 21 is fixed to the shaft 20 and is thereby rotatable therewith in either direction. A helical gear 22 is fixed to roll 13 and a helical gear 23 is fixed to shaft 14. Gears 21,22,23, are parallel with one another but do not intermesh directly. It is the object of the invention to have a pair of gear followers 25,2~ freely rotatable in bronze bushings 31, ~ nd to 32, on a rocker arm plate 27,~alternately mesh with the roll shaft gears to transfer the rotational force of driver gear 21 to the driven rolls and thereby wind the curtain 15.
~ ocker arm plate 27 is freely rotatable in a bronze bushing on shaft 30 and is set bet~een gear 21 and the end of frame 15. Stop means 28,29 are fixed to the frame 15 to limit thedownward travel of the arm 27 when the torque of rotating drive gear 21 dxives one of the follower -`- 3.155~
are mounted gears 25,26. The helical follower gears /eccentrically with one another and the drive gear 21 to insure that only one of them will be able to engage a roll gear at the same time. Upon rotation of the gear 21 each of gears 25,26 are freely driven but due to the configuration of the arm 27 and the spacing of the roll gears 22,23,only one of the rotating gear followers 25,26, will be capable of transmitting motion at any one time.
Operation of the Invention In the drawing shown,the shaft 30 is being rotated in a counter-clockwise direction carrying the driver gear in the same direction. The motion is being transferred to follower 25 which rotates in the opposite direction but is prevented from traveling out of mesh by the stoppl~g of the arm 27 by pin stop 28. The rotation force is thereby transferred to gear 22 which becomes counter-clockwise to wind the curtain 12 onto roll 13 as required. With the gear 26 eccentrically mounted on the arm 27 in relation to the alignment of gears 21,25, the motor 16 is rever-sed by the operator control or sensor means (not shown) which cawses reversing of the gear 21 and creates a torque force along the line of the shaft 30 and bushing 32 thereby overbalancing arm 27. The torque motion instantaneously pulls the gear 25 out of engagement with the gear 22 and causes the gear 26 to engage gear 23 thereby transferring motion to shaft 14 and winding the curtain 12 in a clockwise direction as required.
' 6 ~
Claims (2)
- THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
I. In a destination sign of the curtain type for display on a bus or like vehicle comprising in combination;
a frame member having side walls and end walls and with open upper part adapted to display a section of a display curtain therein;
a curtain roll shaft rotatable between the ends of said frame and spaced apart and in parallel relation to a second curtain roll shaft rotatable between said ends of said frame, said curtain being partly wound on each roll with said section displayed therebetween;
a helical gear on each of said rolls and rotatable in parallel with one another;
an electric power reversing motor mounted on said frame driving a drive shaft member equidistantly spaced in parallel between said roll shafts;
a helical gear mounted on said drive shaft for rotational motion there-with in line with said gears on said roll shafts, and a pair of follower helical gears eccentrically mounted on a rocker arm plate freely rotatable on said drive shaft adjacent said drive gear;
adapted to intermesh with said drive gear and to alternatively transmit rotational motion from said drive gear to either one or the other of said shafts of said curtain rolls. - 2.In destination sign as in claim 1 wherein said rocker arm is prevented frm completing travel in either counter-clockwise or clockwise direction upon rotation of said drive shaft and after reversal of said drive shaft by interpositioning of stop means from the frame end.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000373709A CA1155295A (en) | 1981-03-24 | 1981-03-24 | Reversing mechanism for curtain type route indicator |
| GB8202889A GB2095455B (en) | 1981-03-24 | 1982-02-02 | Destination sign of the curtain type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000373709A CA1155295A (en) | 1981-03-24 | 1981-03-24 | Reversing mechanism for curtain type route indicator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1155295A true CA1155295A (en) | 1983-10-18 |
Family
ID=4119521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000373709A Expired CA1155295A (en) | 1981-03-24 | 1981-03-24 | Reversing mechanism for curtain type route indicator |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1155295A (en) |
| GB (1) | GB2095455B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60139950A (en) * | 1983-12-27 | 1985-07-24 | Seiko Epson Corp | Power transmission system |
| FR2585165B1 (en) * | 1985-07-19 | 1988-08-19 | Porte Sa Ets Maurice | DEVICE FOR REMOTE DISPLAY OF A STRIP CARRYING THE INDICATIONS TO BE DISPLAYED |
| IT1192065B (en) * | 1986-01-07 | 1988-03-31 | Zanetti Franco Epc System | DEVICE FOR DISPLAYING ADVERTISING MESSAGES |
| CN101081131B (en) * | 2006-06-02 | 2011-06-29 | 宣云云 | Multi-picture wrap-up device |
-
1981
- 1981-03-24 CA CA000373709A patent/CA1155295A/en not_active Expired
-
1982
- 1982-02-02 GB GB8202889A patent/GB2095455B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2095455B (en) | 1984-08-22 |
| GB2095455A (en) | 1982-09-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |