CA1037404A - Release and blocking mechanism for power operated typewriters - Google Patents
Release and blocking mechanism for power operated typewritersInfo
- Publication number
- CA1037404A CA1037404A CA234,710A CA234710A CA1037404A CA 1037404 A CA1037404 A CA 1037404A CA 234710 A CA234710 A CA 234710A CA 1037404 A CA1037404 A CA 1037404A
- Authority
- CA
- Canada
- Prior art keywords
- keylever
- lock link
- carriage
- frame
- release mechanism
- 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
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/24—Case-shift mechanisms; Fount-change arrangements
-
- 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
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/54—Locking devices applied to printing mechanisms
- B41J29/58—Locking devices applied to printing mechanisms and automatically actuated
- B41J29/60—Locking devices applied to printing mechanisms and automatically actuated in response to failure of power supply
Landscapes
- Accessory Devices And Overall Control Thereof (AREA)
- Handling Of Sheets (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A shift release mechanism is connected to an electrical switch and to a control knob on a power operated typewriter. Operating the control knob actuates the electrical switch from a closed state to an open state and actuates the shift release mechanism for releasing a shift keylever to cause a platen supporting carriage to move from an upper position to a lower position. The shift re-lease mechanism further includes a finger positioned to block the depression of the shift keylever when the electrical switch is in the open state.
A shift release mechanism is connected to an electrical switch and to a control knob on a power operated typewriter. Operating the control knob actuates the electrical switch from a closed state to an open state and actuates the shift release mechanism for releasing a shift keylever to cause a platen supporting carriage to move from an upper position to a lower position. The shift re-lease mechanism further includes a finger positioned to block the depression of the shift keylever when the electrical switch is in the open state.
Description
t' ` .!., ~1 . 10;~74~4 BAC:~GROUND OF TEIE INVENTION
The present invention relates to power operated type- ~-writers and more particularly to a shift release and blocking mechanisms for a carriage shi~t control mechanism~.
; Inactiva~ing various functions o~ a power operated `~
i typewriter, when the power is turned o~f, to prevent damage to the mechanism or injury to the operator has been recognized `
, as a perennial concern within the typewriter industry.
Shift release and blocking mechanism in the prior art have included bails that were actuated by opening a switch.
The bail conditioned all keylevers to be inoperable but ~i~
not disengage any function keys that were already depre~sed.
Consequentlyr when the ~witch was closed, the typing ~unction, ~' that was actuated by the depressed function key, completed its cycle. In most cases, the added strain placed on the power source by the completing function cycle combined with the strain of bringing the typewriter mechanism to operation readi-1 ness could overload and cause damage to the power source.
j;~ In the event that the function selected was a ... : .: ;; ~:
carriage return function and the op~rator was cleaning the typewriter, a sudden~ carriage return cycle could cause injury.
None of the~prior art teaches a mechanism that ; releases a function~key when the electrical switch is con-ditioned to an open state and renders the key inoperable until the switch is in a closed state. ~ `
SUMMARY OF ~E INVENTION
Briefly described, the present invention teaches a i~,, j: . . , .;; shift release and bloaking mechanism for a shi~t mechanism of ;`~ a power operated typewriter.
.;1 30 The shift mechanism includes a shift keylever and ~s ;~ ! .::.. .
shift lock link. The shift lock link is pivotal on the shïft j;;
~; keylever and includes an abutment having a recess that engages a fixed shelf when the shift lock link is actuated.
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A control knob has a link extending in opposite directions therefrom. One end of the link is coupled to a .. . . -- switch mechanism in such a manner that rotation of the control '~ knob results in a corresponding movement of the switch ~ mechanism to render the switch circuit closed or open depend-,; ,. .
, ing on the direction of rotation of the control knob. The ~. . . .
! other end of the link is coupled to a shift control mechanism ~
. ,:...................................................................... ~
that includes a pivotal bellcrank having a release and block~
; ing finger extending therefrom. Therefore, movement of the ::,: :.. .
~ 10 control knob that renders the switch open or closed also pivots ~: ", ".;, , the bellcrank and bellcrank finger. The bellarank finger then ... . ~ ...
i~ contacts the link abutment and urges the link to di~engage ~i fxom the fixed shelf. Acaordingly, an object of the present ' invention is to release the carriage from the upper carriage ;~
shift position to the lower carriage shift position when the ;, switch is conditioned to the open state. The lower position of the carriage provides a low silhouette with no portions of the carriage projecting beyond the basic machine lines. ;~
Another object of the present invention is to block ~; 20 the depression o~the keylever when the switch is in the open ~-state to prevent actuating of the shift mechanism until the switch is again conditioned in the closed state by the control knob. This sequence protects the drive motor by preventing the drive motor from being prematurely loaded by the shift mechanism.
i; ¦ !.'., According to the present in~ention, the release mechanism for a power operated typewriter which has a frame, ~;;
a platen supporting carriage shiftable on the frame between ~ an upper position and a lower position, a keylever operatively ; 30 connected to the carriage and s~pported on the frame for move-`~ ment between a first position with the carriage in the lower , ~l . ' . ':
position and a second position with the carriage in the u~per . ," ' . .
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position, an electrical switch operable between a closed ; state and an open state, the release mechanism has a locking ~ means supported on the frame for a~cking the keylever in the : ., .
second position, control means supported on the frame for conditioning the electrical switch between the closed state ;~ and the open state, and means movably supported on the frame l~ and responsive to the control means for releasing the keylever from the second position for movement to the first position for locating the carriage in the lower position.
Other objects, features, and advantages of the invention will become more apparent from the following des-r~,, cription, appended laims, and accompanying drawing.
'' '' ', !, BYIE~ DBSC ~
Figure 1 i~ a le~t elevation vtew o~ a typewriter showing the present invention with the carriage in the lower case shift position.
,, .i Figure 2 is a view similar to Figure 1 except the ' keylever is depressed and the carriage is in the upper case shift position. A ~, Figure 3 is an enlarged elevational view showing the shift lock link being released by the release mechanism.
DESCRIPTION OF THE PREFERRED EMBODIMENT `I
ReferrLng to the drawings and in parti~ular to Figure 1, a portion of a typewriter 10 is shown. A
carriage 12 provides ^
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~ the support for a printing platen 14. Carriage 12, movable , .- from a lower shifted position to an upper shifted position, is shown in the lower shifted position with a typebar 15 im~
`~i paeting on platen 14. `~
, ;,., - ' An eleetrically operative switch 16 is fixed to a frame member 18. A switeh bellcrank 20 is pivotally supported ;
. . ,~ , . .
about pivot 21 and is coupled to a switch button 22 of " switch 16. Switch button 22 is responsive to the pivotal ,j' .. :; :~.,.-movement of switch bellcrank 20 to condition switch 16 to a ; `
. 10 closed state or an open state.
. i; . . i ,,,~ A control link 24 has one end 26 pivotally eoupled ~ ;
ri~ to swlteh bellerank 20. Control link 24 extends forward and :; ~ ' i 9 pivotally eonnected to a control knob 28 at a pivot 3 0 that is spaced from either end of aontrol link 24. Control link 24 extends further forward and terminates in a horizontal ;, . .
flange 32 that extends inward.
. ", .
Control knob 28 is rotatable about a frame mounted stud~ 27 and ie positioned above control link 24 for easy `
acces~ by an operator. Control knob 28 includes a projecting -~i''l:.i~ 20 ~ abutment 29 and~a~projeeting hub 3L. Abutment 29 limits the ``
oountereloekwieé~rotation of the control knob 20 and hub 31 "~
limits the clockwLse rotation of the control knob 28. ~ `~
flange 32 of link 24 ie pivotally and slideably eoupled to an ups*anding arm 34 of a bellerank 36. Arm 34 `~ ineludes a slot 38 in whieh flange 32 is slideably engaged.
Bellerank 36 is pivotally supported on a frame mounted pivot ~l~ stud 40. Bellarank 36 ~urther includes a second upstandingarm 42 that terminates in a forward extending finger 44. ~;
A shift keylever 46 is pivotally supported on ~ 30 frame 18 at pivot 47 and biased upward towards a rest position ;-'' by a spring 48. One end of spring 48 ~not shown) is mounted ~I to frame 18 and the other end 53 is attaehed to an extension 49 . : .
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of keylever 46. Upward and downward movement o keylever 46 is limited by a pair of integral extending fingers 50 and 52 that abut a fixed shelf 54 positioned therebetween.
~ A shift lock link 56 is pivotally supported about a ~`
i~ii pivot 58 on shift keylever 46. Therefore, any movement of shift keylever 46 results in a corresponding movement of ',, : j!~. . . '.
shift lock link 56. ~ spring 60 connected between extension 62 of keylever 46 and extension 64 of shift lock link 56 biases :,;:~,, ,j lock link 56 upward towards a rest position. The rest posi~
I0 tion of lock link 56 is determined by a lock link lug 57 that abuts a lower edge 59 of keylever 46. Shift lock link 56 further includes a downstanding abutment 66 that lies in the ~; pivot pa~h of bellarank finger 44 and has a forward edge 68 'l adjacent an edgc 70 of fixod shelf 5~. Forward edge 68 o~ ,;
'~ ' abutment 66 includes a latahing rece~ 72 and a latching surface 74.
During operation' control knob 28 is manually rotated clockwise as viewed in Figure 2. L~nk 24 is urged rearward ~, to pivot switch bellcrank 20 rearward until switch button 22 ; 20 conditions switch 16 to a closed state. The rearward movement of link 24 also ~urges bellcrank 36 to pivot counterclockwise.
Bellcrank finger 44 is therefore position out of the path of ,-abutment 66 to allow for the depression of shift lock ~ink 56.
When a oontinuous shi~t operation is desired, shift lock link 56 is depressed. Link abutment 66 is moved down-ward as surface 68 abuts and slides down along shel~ edge 70 as shown in Figure 1. Ahutment 66 aontlnues to slide down l~ along shelf edge 70 until recess 72 is in alignment with shelf y~ edge 70 at which time latching sur~ace 74 slides under and ~i`:;`.~ , r!~ 30 into latching engagement with shel~ edge 70 as shown in ,'"'?1l' Figure 2. ~t this time, through appropriate linkage ~not `',.:'1 ', ~ shown), printing platen 14 is conditioned to an upper carriage t shift position.
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, , ! : , .
~ ~L037~L04 ~. When it is desired to discontinue the continuous ~ ;
;: shift operation, as viewed in Figures 1 and 3, keylever 46 is depressed. Lock link 56 is urged to move downward until ;
: latching surface 74 is disengaged from shelf 70 by the , spring 60. ~ock link 56 is then biased to pivot upward to its rest position on keylever 46 by the spring 60 and key-. lever 46 is biased to pivot upward to its rest position on frame 18 by the spring 48. At this time, carriage 12 is conditioned to a lower shift position.
,....................................................................... ...
If, however, the power supply of the typewriter is shut o~f without disengaging the shift mechanism from its upper shit position, the present invention wlll beaome ;i eeative.
The present invention becomes effective when control ".; ~
knob 28 is manually rotated counterclockwise. Link 24 is ;
urged forward until switch bellcrank 20 moves switch button 22 i 'l to condition switch 16 to an open state. The forward movement ;il of link 24 also urges bellcrank 36 to pivot clockwise. Bell~ -crank finger 44 i9 then pivoted into contact with abutment edge 68 as illustrated in Figure 3. Continued pivotal move~
ment of bellcrank 36~progressively urges latching surface 74 to disengage~from shelf 70. Lock link 56 is then biased to ~ ? ~ ` .
pivot upward to its rest position on ~eylever 46 and key-; lever 46 is biased to pivot upward to its rest position on ~rame 18. Carriage 12 is now conditioned to a lower shift position and the typewriter is in an inoperative state.
i~i ~ A safeguard against actuation of the shift mechanism ~1 when the typewriter is in an inoperative state is provided for ..... ...
,l by the continued pivotal mov~ment of bellcrank 36. Continued `
:l 30 pivotal movement of bellcrank 36 positions bellarank finger 44 ~` under and into the operative path of lock link abutment 66.
Therefore, any downward movement of lock link 56 is blocked ~ .. 1 ., ( 6 . ~ , .. .
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. un.~il the control knob 28 is rotated clockwise and the i ; control link 24 pivots the finger 44 from under the abut- i~!;,,'~,' ~, ment 66.
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The present invention relates to power operated type- ~-writers and more particularly to a shift release and blocking mechanisms for a carriage shi~t control mechanism~.
; Inactiva~ing various functions o~ a power operated `~
i typewriter, when the power is turned o~f, to prevent damage to the mechanism or injury to the operator has been recognized `
, as a perennial concern within the typewriter industry.
Shift release and blocking mechanism in the prior art have included bails that were actuated by opening a switch.
The bail conditioned all keylevers to be inoperable but ~i~
not disengage any function keys that were already depre~sed.
Consequentlyr when the ~witch was closed, the typing ~unction, ~' that was actuated by the depressed function key, completed its cycle. In most cases, the added strain placed on the power source by the completing function cycle combined with the strain of bringing the typewriter mechanism to operation readi-1 ness could overload and cause damage to the power source.
j;~ In the event that the function selected was a ... : .: ;; ~:
carriage return function and the op~rator was cleaning the typewriter, a sudden~ carriage return cycle could cause injury.
None of the~prior art teaches a mechanism that ; releases a function~key when the electrical switch is con-ditioned to an open state and renders the key inoperable until the switch is in a closed state. ~ `
SUMMARY OF ~E INVENTION
Briefly described, the present invention teaches a i~,, j: . . , .;; shift release and bloaking mechanism for a shi~t mechanism of ;`~ a power operated typewriter.
.;1 30 The shift mechanism includes a shift keylever and ~s ;~ ! .::.. .
shift lock link. The shift lock link is pivotal on the shïft j;;
~; keylever and includes an abutment having a recess that engages a fixed shelf when the shift lock link is actuated.
~ j . .
1` - 2 - . ~
....
- i ~0374~ ~
A control knob has a link extending in opposite directions therefrom. One end of the link is coupled to a .. . . -- switch mechanism in such a manner that rotation of the control '~ knob results in a corresponding movement of the switch ~ mechanism to render the switch circuit closed or open depend-,; ,. .
, ing on the direction of rotation of the control knob. The ~. . . .
! other end of the link is coupled to a shift control mechanism ~
. ,:...................................................................... ~
that includes a pivotal bellcrank having a release and block~
; ing finger extending therefrom. Therefore, movement of the ::,: :.. .
~ 10 control knob that renders the switch open or closed also pivots ~: ", ".;, , the bellcrank and bellcrank finger. The bellarank finger then ... . ~ ...
i~ contacts the link abutment and urges the link to di~engage ~i fxom the fixed shelf. Acaordingly, an object of the present ' invention is to release the carriage from the upper carriage ;~
shift position to the lower carriage shift position when the ;, switch is conditioned to the open state. The lower position of the carriage provides a low silhouette with no portions of the carriage projecting beyond the basic machine lines. ;~
Another object of the present invention is to block ~; 20 the depression o~the keylever when the switch is in the open ~-state to prevent actuating of the shift mechanism until the switch is again conditioned in the closed state by the control knob. This sequence protects the drive motor by preventing the drive motor from being prematurely loaded by the shift mechanism.
i; ¦ !.'., According to the present in~ention, the release mechanism for a power operated typewriter which has a frame, ~;;
a platen supporting carriage shiftable on the frame between ~ an upper position and a lower position, a keylever operatively ; 30 connected to the carriage and s~pported on the frame for move-`~ ment between a first position with the carriage in the lower , ~l . ' . ':
position and a second position with the carriage in the u~per . ," ' . .
~; 4~
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~037~04 ``:
position, an electrical switch operable between a closed ; state and an open state, the release mechanism has a locking ~ means supported on the frame for a~cking the keylever in the : ., .
second position, control means supported on the frame for conditioning the electrical switch between the closed state ;~ and the open state, and means movably supported on the frame l~ and responsive to the control means for releasing the keylever from the second position for movement to the first position for locating the carriage in the lower position.
Other objects, features, and advantages of the invention will become more apparent from the following des-r~,, cription, appended laims, and accompanying drawing.
'' '' ', !, BYIE~ DBSC ~
Figure 1 i~ a le~t elevation vtew o~ a typewriter showing the present invention with the carriage in the lower case shift position.
,, .i Figure 2 is a view similar to Figure 1 except the ' keylever is depressed and the carriage is in the upper case shift position. A ~, Figure 3 is an enlarged elevational view showing the shift lock link being released by the release mechanism.
DESCRIPTION OF THE PREFERRED EMBODIMENT `I
ReferrLng to the drawings and in parti~ular to Figure 1, a portion of a typewriter 10 is shown. A
carriage 12 provides ^
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1037404 ;:
~ the support for a printing platen 14. Carriage 12, movable , .- from a lower shifted position to an upper shifted position, is shown in the lower shifted position with a typebar 15 im~
`~i paeting on platen 14. `~
, ;,., - ' An eleetrically operative switch 16 is fixed to a frame member 18. A switeh bellcrank 20 is pivotally supported ;
. . ,~ , . .
about pivot 21 and is coupled to a switch button 22 of " switch 16. Switch button 22 is responsive to the pivotal ,j' .. :; :~.,.-movement of switch bellcrank 20 to condition switch 16 to a ; `
. 10 closed state or an open state.
. i; . . i ,,,~ A control link 24 has one end 26 pivotally eoupled ~ ;
ri~ to swlteh bellerank 20. Control link 24 extends forward and :; ~ ' i 9 pivotally eonnected to a control knob 28 at a pivot 3 0 that is spaced from either end of aontrol link 24. Control link 24 extends further forward and terminates in a horizontal ;, . .
flange 32 that extends inward.
. ", .
Control knob 28 is rotatable about a frame mounted stud~ 27 and ie positioned above control link 24 for easy `
acces~ by an operator. Control knob 28 includes a projecting -~i''l:.i~ 20 ~ abutment 29 and~a~projeeting hub 3L. Abutment 29 limits the ``
oountereloekwieé~rotation of the control knob 20 and hub 31 "~
limits the clockwLse rotation of the control knob 28. ~ `~
flange 32 of link 24 ie pivotally and slideably eoupled to an ups*anding arm 34 of a bellerank 36. Arm 34 `~ ineludes a slot 38 in whieh flange 32 is slideably engaged.
Bellerank 36 is pivotally supported on a frame mounted pivot ~l~ stud 40. Bellarank 36 ~urther includes a second upstandingarm 42 that terminates in a forward extending finger 44. ~;
A shift keylever 46 is pivotally supported on ~ 30 frame 18 at pivot 47 and biased upward towards a rest position ;-'' by a spring 48. One end of spring 48 ~not shown) is mounted ~I to frame 18 and the other end 53 is attaehed to an extension 49 . : .
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.. .. .
.... .
.
~0374~4 ::
of keylever 46. Upward and downward movement o keylever 46 is limited by a pair of integral extending fingers 50 and 52 that abut a fixed shelf 54 positioned therebetween.
~ A shift lock link 56 is pivotally supported about a ~`
i~ii pivot 58 on shift keylever 46. Therefore, any movement of shift keylever 46 results in a corresponding movement of ',, : j!~. . . '.
shift lock link 56. ~ spring 60 connected between extension 62 of keylever 46 and extension 64 of shift lock link 56 biases :,;:~,, ,j lock link 56 upward towards a rest position. The rest posi~
I0 tion of lock link 56 is determined by a lock link lug 57 that abuts a lower edge 59 of keylever 46. Shift lock link 56 further includes a downstanding abutment 66 that lies in the ~; pivot pa~h of bellarank finger 44 and has a forward edge 68 'l adjacent an edgc 70 of fixod shelf 5~. Forward edge 68 o~ ,;
'~ ' abutment 66 includes a latahing rece~ 72 and a latching surface 74.
During operation' control knob 28 is manually rotated clockwise as viewed in Figure 2. L~nk 24 is urged rearward ~, to pivot switch bellcrank 20 rearward until switch button 22 ; 20 conditions switch 16 to a closed state. The rearward movement of link 24 also ~urges bellcrank 36 to pivot counterclockwise.
Bellcrank finger 44 is therefore position out of the path of ,-abutment 66 to allow for the depression of shift lock ~ink 56.
When a oontinuous shi~t operation is desired, shift lock link 56 is depressed. Link abutment 66 is moved down-ward as surface 68 abuts and slides down along shel~ edge 70 as shown in Figure 1. Ahutment 66 aontlnues to slide down l~ along shelf edge 70 until recess 72 is in alignment with shelf y~ edge 70 at which time latching sur~ace 74 slides under and ~i`:;`.~ , r!~ 30 into latching engagement with shel~ edge 70 as shown in ,'"'?1l' Figure 2. ~t this time, through appropriate linkage ~not `',.:'1 ', ~ shown), printing platen 14 is conditioned to an upper carriage t shift position.
````! ::
l~ - ~ 5 ~ ` ~
, , ! : , .
~ ~L037~L04 ~. When it is desired to discontinue the continuous ~ ;
;: shift operation, as viewed in Figures 1 and 3, keylever 46 is depressed. Lock link 56 is urged to move downward until ;
: latching surface 74 is disengaged from shelf 70 by the , spring 60. ~ock link 56 is then biased to pivot upward to its rest position on keylever 46 by the spring 60 and key-. lever 46 is biased to pivot upward to its rest position on frame 18 by the spring 48. At this time, carriage 12 is conditioned to a lower shift position.
,....................................................................... ...
If, however, the power supply of the typewriter is shut o~f without disengaging the shift mechanism from its upper shit position, the present invention wlll beaome ;i eeative.
The present invention becomes effective when control ".; ~
knob 28 is manually rotated counterclockwise. Link 24 is ;
urged forward until switch bellcrank 20 moves switch button 22 i 'l to condition switch 16 to an open state. The forward movement ;il of link 24 also urges bellcrank 36 to pivot clockwise. Bell~ -crank finger 44 i9 then pivoted into contact with abutment edge 68 as illustrated in Figure 3. Continued pivotal move~
ment of bellcrank 36~progressively urges latching surface 74 to disengage~from shelf 70. Lock link 56 is then biased to ~ ? ~ ` .
pivot upward to its rest position on ~eylever 46 and key-; lever 46 is biased to pivot upward to its rest position on ~rame 18. Carriage 12 is now conditioned to a lower shift position and the typewriter is in an inoperative state.
i~i ~ A safeguard against actuation of the shift mechanism ~1 when the typewriter is in an inoperative state is provided for ..... ...
,l by the continued pivotal mov~ment of bellcrank 36. Continued `
:l 30 pivotal movement of bellcrank 36 positions bellarank finger 44 ~` under and into the operative path of lock link abutment 66.
Therefore, any downward movement of lock link 56 is blocked ~ .. 1 ., ( 6 . ~ , .. .
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.. `:
... -, ~ , ;` 103~iO~
. un.~il the control knob 28 is rotated clockwise and the i ; control link 24 pivots the finger 44 from under the abut- i~!;,,'~,' ~, ment 66.
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Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A release mechanism for a power operated type-writer having a frame, a platen supporting carriage shiftable on the frame between an upper position and a lower position, a keylever operatively connected to the carriage and supported on the frame for movement between a first position with the carriage in the lower position and a second position with the carriage in the upper position, an electrical switch operable between a closed state and an open state for energizing the typewriter, said release mechanism comprising:
locking means supported on the frame for locking the keylever in the second position;
control means supported on the frame for con-ditioning the electrical switch between the closed state and the open state; and means movably supported on the frame and respon-sive to said control means for releasing the keylever from the second position for movement to the first position for locat-ing the carriage in the lower position.
locking means supported on the frame for locking the keylever in the second position;
control means supported on the frame for con-ditioning the electrical switch between the closed state and the open state; and means movably supported on the frame and respon-sive to said control means for releasing the keylever from the second position for movement to the first position for locat-ing the carriage in the lower position.
2. A release mechanism as defined in claim 1 wherein said locking means includes a lock link pivotally supported on said keylever, said lock link includes a latching shelf and an abutment, said locking means further includes a shelf fixed to the frame for engagement by said latching shelf when the keylever is locked in the second position, and said responsive means includes a finger for contacting said abutment of said lock link and moving said lock link for releasing said latching shelf from said fixed shelf to release the keylever from the second position for movement to the first position for locating the carriage in the lower position.
3. A release mechanism as defined in claim 2 wherein said lock link includes a lug for engaging the key-lever to define an inoperative position of said lock link relative to the keylever, and a spring connected to said lock link for biasing said lock link to said inoperative position when said lock link is released by said finger of said res-ponsive means.
4. A release mechanism as defined in claim 1 wherein said control means includes an operable member and a control link connected to said operable member, said control link couples said electrical switch to said responsive means for conditioning said electrical switch from the closed state to the open state and for releasing the keylever from the second position for movement to the first position upon actuation of the operable member.
5. A release mechanism as defined in claim 2 wherein said responsive means includes locking means located in the path of said lock link for preventing depression of the keylever when said control means has conditioned the electrical switch in said open state.
6. A release mechanism as defined in claim 5 wherein said blocking means includes a surface on said finger for underlying said abutment of said lock link thereby preventing depression of the keylever.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US504413A US3920114A (en) | 1974-09-09 | 1974-09-09 | Release and blocking mechanism for power operated typewriters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1037404A true CA1037404A (en) | 1978-08-29 |
Family
ID=24006173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA234,710A Expired CA1037404A (en) | 1974-09-09 | 1975-09-03 | Release and blocking mechanism for power operated typewriters |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3920114A (en) |
| JP (1) | JPS5156321A (en) |
| CA (1) | CA1037404A (en) |
| FR (1) | FR2283784A1 (en) |
| GB (1) | GB1496409A (en) |
| IT (1) | IT1042391B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6020943Y2 (en) * | 1979-08-29 | 1985-06-22 | 三菱電機株式会社 | semiconductor equipment |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2304357A (en) * | 1937-09-14 | 1942-12-08 | Underwood Elliott Fisher Co | Typewriting machine |
| US2499053A (en) * | 1945-06-01 | 1950-02-28 | Buchel Robert | Automatic locking and releasing device for shift keys on typewriters |
| US2506703A (en) * | 1946-07-20 | 1950-05-09 | Marie F Chisholm | Key locking mechanism for keyboard controlled machines |
| US3349886A (en) * | 1965-12-02 | 1967-10-31 | Royal Typewriter Co Inc | Mechanism for locking the keyboard of electric typewriters or like machines |
| US3572488A (en) * | 1969-01-15 | 1971-03-30 | Marx & Co Louis | Shift and shift lock mechanism for typewriter |
| GB1243485A (en) * | 1969-07-15 | 1971-08-18 | Olivetti & Co Spa | Device for locking the carriage of an electric typewriter |
-
1974
- 1974-09-09 US US504413A patent/US3920114A/en not_active Expired - Lifetime
-
1975
- 1975-09-03 CA CA234,710A patent/CA1037404A/en not_active Expired
- 1975-09-08 JP JP50108121A patent/JPS5156321A/en active Granted
- 1975-09-08 FR FR7527510A patent/FR2283784A1/en active Granted
- 1975-09-09 GB GB37035/75A patent/GB1496409A/en not_active Expired
- 1975-09-09 IT IT27049/75A patent/IT1042391B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| US3920114A (en) | 1975-11-18 |
| FR2283784B1 (en) | 1978-04-07 |
| GB1496409A (en) | 1977-12-30 |
| IT1042391B (en) | 1980-01-30 |
| JPS5156321A (en) | 1976-05-18 |
| DE2539796B2 (en) | 1977-06-08 |
| FR2283784A1 (en) | 1976-04-02 |
| JPS5545036B2 (en) | 1980-11-15 |
| DE2539796A1 (en) | 1976-03-25 |
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