US3706366A

US3706366A - Repeat typing mechanism for power operated typewriters

Info

Publication number: US3706366A
Application number: US97076A
Authority: US
Inventors: Yukio Hishida; Nakai Toshio; Susumu Kuzuya
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 1969-12-16
Filing date: 1970-12-11
Publication date: 1972-12-19
Anticipated expiration: 1989-12-19

Abstract

A repeat typing mechanism for power operated typewriters comprising a snatch roll, pawl members detachably engaged therewith, actuating members rockable about a fixed shaft so as to hold said pawl members in a rockable state, key levers, and control levers actuated by said levers and provided with first and second bent lugs disposed substantially at right angles to each other, wherein the key lever can be successively depressed in two steps, and at the time of the first step depression of the key lever by the first bent lug and at the time of the second step depression thereof by cooperation of the first and second bent lugs, the upwardly extending engaging arm of the pawl member is directly actuated to cause the pawl member to be engaged with or disengaged from the snatch roll with the resulting operation of the actuating member, said first step depression leading to a non-repeat typing action and said second step depression to a repeat typing action.

Description

United States Patent Hishida et a1.

[451' Dec. 19,1972

1541 REPEAT TYPING MECHANISM FOR POWER OPERATED TYPEWRITERS [73] Assignee: Brother Kogyo Kabushiki Kaisha,

Nagoya-shi, Japan [22] Filed: Dec. 11, 1970 [21] Appl. No.: 97,076

.[30] Foreign Application Priority Data 1,929,975 10/1933 Hokanson.

2,600,200 6/1952 Brink ....197/17 2,620,056 12/1952 Kupper ....197/17 2,714,948 8/1955 Schremp et al. ....l97/l7 2,723,740 11/1955 Toeppen ..197/l7 Kennedy, Jr.- 197/17 Salto ..l97/l7 Primary Examiner-Robert E. Pulfrey Assistant Examiner-R. T. Rader Attorney-Flynn & Frishauf [57] ABSTRACT A repeat typing mechanism for power operated typewriters comprising a snatch roll, pawl members detachably engaged therewith, actuating members rockable about a fixed shaft so as to hold said pawl members in a rockable state, key'levers, and control levers actuated by said levers and provided with first and second bent lugs disposed substantially at right angles to each other, wherein the key lever can be successively depressed in two steps, and at the time of the first step depression of the key lever by the first bent lug and at the time of the second step depression thereof by cooperation of the first and second bent lugs, the upwardly extending engaging arm of the pawl member is directly actuated to cause the pawl member to be engaged with or disengaged from the snatch roll with the resulting operation of the actuating member, said first step depression leading to a non-repeat typing action and said second step depression to a repeat typing action.

4 Claims, 9 Drawing Figures PATENTED HEB 19 I972 3 7 05 5 saw u or 4 REPEAT TYPING MECHANISM FOR POWER OPERATED TYPEWRITERS BACKGROUND OF THE INVENTION the type key is depressed. A repeat typing mechanism of this type is disclosed in US. Pat. No. 3.342,295, issued on Sept. I9, 1967.

In general, the repeat typing mechanism of a power operated typewriter is so designed that while the type key is held at a deeper depressed position than in a nonrepeat typing action, the actuating member is repeatedly engaged with the snatch roll through the pawl members as intermediate means to cause the type bar to conduct repeat typing action.

In the known power operated typewriters, the intermediate means including the'pawl members for allowing the actuating member I to be engaged with the snatch roll is of so extremely complicated arrangement that the repeat typing mechanism has to be formed of a large number of parts, resulting in an intricate construction. Accordingly, said repeat typing mechanism as a whole unavoidably becomes bulky and heavy, and its assembly consumes a great deal of time and work, thus constituting a site of frequent failures.

With the prior art repeat typing mechanism, the timing at which the pawl member engages the snatch roll changes with the repeat and non-repeat typing actions, with the resulting variation in the extent of rotation of the type bar and the color density of printed letters. It has often been pointed out that the required striking force of the type bar for a repeat typing action is more weakened than in a non-repeat typing action, causing the clearness of the letter printed during the repeat typing action prominently to fade off. A further disadvantage of the conventional apparatus is that, even during the repeat typing action, the cycle of printing individual letters is conducted in an uneven period, with the resulting irregularities in the distinctiveness of letters printed.

SUMMARY OF THE INVENTION It is accordingly an object of the present invention to provide a repeat typing mechanism for power operated typewriters wherein the pawl member engages the snatch roll at substantially the same timing, whether in a non-repeat or repeat typing action, enabling the type bar to be actuated always in the same condition and in consequence preventing the appearance of different shades of color in printed letters between the single and the repeat typing actions.

Another object of the invention is to provide a repeat typing mechanism for power operated typewriters capable of avoiding any change in the color density of letters printed even during the repeat typing itself.

Still another object of the invention is to provide a repeat typing mechanism for power operated typewriters which, as compared with the prior art apparatus, comprises a smaller number of component parts and in consequence is not only of more simple construction, more readily adjustable, substantially more compact and durable, but also requires less manufacturing cost.

A further object of the invention is to provide means wherein the decreased number of component parts driven by the snatch roll reduces their total weight, eliminates their erroneous action and permits their smooth, unfailing, quick operation, thereby enabling typing to be conducted faster and more reliably than has been possible with the prior art.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a left-hand cross sectional side view, showing theessential parts of a typewriter incorporating a repeat typing mechanism constituting oneembodiment of the present invention;

FIGS. 2 through 6 are views similar to that of FIG. 1 respectively indicating the operational states of the mechanism shown in FIG. 1; and

FIGS. 7, 8 and 9 present the type key and parts related thereto in an inoperative. state and first and second actuated positions respectively.

DETAILED DESCRIPTION OF THE INVENTION l Referring first to FIGS. 1 through 4 particularly illustrating a single type action, there is provided a power roll 11 (usually called a snatch roll) which extends across a typewriter frame and continuously rotates in a counterclockwise direction (as viewed from the figures) when driven by an electric motor (not shown) through an appropriate transmission system (not shown).

A support frame 13 forming part of the typewriter frame is disposed parallel to and slightly forward of the snatch roll 11 and supports a fixed shaft 14 to which there is pivoted an actuating member 12. The actuating rjnember 12 has a first or rear end arm 12a so projecting 1 and a second or forward end arm 12b projecting ownward from said shaft 14. F A type bar 15 is pivoted to a fixed shaft 16a secured to a type bar segment 16. The type bar 15 has at its exreme free end a type head 15a facing a platen 17 mounted on a carriage (not shown). The type bar 15 further has a driven arm 15b connected to the free end of the arm 12a of the actuating member 12 through a connecting link 21, a bell crank 20 pivoted to a support frame 18 through a fixed shaft 19 and a connecting link 22. Accordingly, the type bar 15 reciprocally rocks about the shaft according to the clockwise or counterclockwise reciprocation of the bell crank 20 as viewed from FIG. I, causing the type head 15a to perform the typing action of striking the platen 17. The type bar 15, bell crank 20 and connecting links 21 constitute a driven part. Holding means or tension spring 23 is stretched between a support frame 24 and the second arm 12b of the actuating member 12 and functions to urge the actuating member 12 clockwise. A stop 25 formed on the support frame 24 engages the second arm 12b and holds the actuating member 12 in its original position as shown in FIG. 1 against the force of the spring 23. A pivoted arm 26a which constitutes one end of a pawl member 26 and extends rearward is rotatably mounted on the first arm 12a of the actuating member 12 through a pivotal shaft 27. The control arm 26b constituting the other end of the pawl member 26 and extending substantially horizontally below the snatch roll 11 is provided with a stop 26c contacting the lower end 12c of the first arm12a so as to restrict the counterclockwise rotation of the pawl member 26 and also with a round cam surface 26d contacting the upper projecting end 28a of a disengaging means or screw 28 for disengaging the pawl member 26 inserted into the support frame 24 from below in a manner to be adjusted vertically. The engaging arm 26:: of the pawl member 26 extends upward from the center of said member 26 toward the rear side of the snatch roll 11,

and is provided at the end with a pawl nose 26f engageable the teeth of the snatch roll 11.

A spring 46 constituting another holding means is stretched between the engaging arm 26c and the first arm 12a of the actuating member 12, and normally urges the pawl member 26 counterclockwise, that is, in the direction in which the pawl nose 26f does not engage the snatch roll 1 luWhen the stop 26c contacts the lower end 12c of the actuating member 12, the pawl member 26 is brought back to its original positio shown in FIG. 1 against the force of the spring 46. Th pawl member 26 and actuating member 12 jointly con stitute actuating means for causing the snatch roll 1 and type bar to be associated with each other. 1

A crank lever 29 is rotatably fitted to a sub-frame 30 through a fixed shaft 31, and provided with downwardly extending operating arm 29a. Substan-. tially at the central part of the operating arm 29a is formed a stop 29b, to the lower end of which there is at-. tached a control lever 32 by means of a pivotal shaft 29c.

To the lower end of the control lever 32 there are attached a first horizontal bent lug 32a facing the engag1 ing upper rear side edge 26g of the engaging arm 26a of} said arm 26e immediately below said engaging upper' edge 26g. At the upper end of the control lever 32 is provided a spring holder 32c which concurrently acts as a stop for restricting the clockwise rotation of said lever 32.

Between the spring holder 32c and the spring holder 29d fitted to the crank lever 29 is stretched a spring 33 which normally urges the operating lever 32 clockwise to keep it in a normal position shown in FIG. 1 due to the spring holder 32c normally contacting the stop 29b of the crank lever 29.

A key lever 34 assumes an inverted L-shape, the horizontal portion of which extends in both forward and rearward directions above the snatch roll 11. At the rearward end (as viewed from the figures) of the horizontal portion of the key lever 34 is formed an upwardly bent section 340 which is fixed by a pivotal shaft 34b to the pivot section of the crank lever 29. The vertical portion of the key lever 34 is connected at the lower end by means of a pivotal shaft 38 to one end of a support crank link 37, the other end of which is rotatably fitted to a fixed shaft 36. At the forward end of the horizontal portion of the key lever 34 is provided a support arm 34c for holding a type key 35. The key lever 34 after section 34a insert including the bent section 34a, crank lever 29, support crank link 37 and

shafts

31, 36, 38 and 34b jointly constitute a quadric crank chain.

end of the bent section 34a of the key lever 34 and a member 30b forming the upper part of the sub-frame 30 is stretched a spring 39. Normally, the key lever 34 is upwardly displaced, that is, to its original position indicated in FIG. 1 so as to cause the upper end 34e of its bent section 34a to contact the stop 30a formed on the sub-frame 30 and also the support crank link 37 to contact a stop 41a provided on a key lever guide plate 41.

A rest member 42 serves to cause the key lever 34 to be depressed in two steps, and is rotatably fitted at one end to the bend of the support arm 340 of thekey lever 34 by means of a pivotal shaft 43,- the other end (the left side portion shown in the figures) assuming a slightly deformed heart-shape. The lower end of the rest member 42 constitutes an engaging section 42b capable of contacting a stop 44 placed on a sub-frame fixed to a guide plate 41, said stop 44 preferably consisting of cushioning material. At the upper end of the rest member 42 is disposed a stop 42a which is normally urged counterclockwise by a spring wound about a pivotal shaft 43 so as to contact the upper side of the horizontal arm 34f of the support arm 340, assuming a position shown in FIG. 7.

There will now be described the operation of a repeat typing mechanism for typewriters according to the present invention. FIGS. 1 and 7 present the positions of the component parts of said mechanism when the type key is not depressed. (Such unactuated state of the type key 35 is hereinafter referred to as a rest position.) When the type key 35 is depressed as shown in FIGS. 2 and 8 to cause the engaging surface 42b of the rest member 42 to contact the stop 44 (such state of the type key 35 is hereinafter referred to as "a first position), then the crank lever 29 swings counterclockwise about the fixed shaft 31 through the key lever 34 to urge the control lever 32 in the same direction about said shaft 31. The first bent lug 32a of the control lever 32 depresses the upper rear side edge 26g of the pawl member 26 to rock said member 26 clockwiseagainst the force of a spring 46 and bring the pawl nose 26f into the rotating field of the snatch roll 1l..Since the snatch roll 11 is kept rotating counterclockwise by an electric motor (not shown) through a transmission system (not shown), one of the teeth of the snatch roll 11 instantly engages the pawl nose 26f as shown in FIG. 2. With the rotation of the snatch roll 1 1,

the tooth depresses the pawl nose 26f to cause the actuating member 12, together with the pawl member 26, to rock counterclockwise about the fixed shaft 14 against the force of the spring 23. The rotation of the actuating member 12 leads to the clockwise rotation of the bell crank 20 through the connecting link 22 and the counterclockwise rotation of the type bar 15 about the fixed shaft 16a through the connecting link 21. The snatch roll further continues to engage and depress the pawl nose 26f after the round cam surface 26d of the arm 26b engages the upper projecting end 28a of the screw 28, thus causing the pawl member to rock counterclockwise about the pivotal shaft 27 with respect to the actuating member 12. The round cam surface 26d being curved outwardly, facilitates its comtact with the upper projecting end 28a of the screw 28 as well as its function as a.fulcrum. The contact between the cam surface 26d and the upper projecting end 284 of the screw 28 can be properly defined by adjustment of the position of the screw 28, in the support frame 24. Further rotation of the snatch roll 11 removes the pawl nose 26f from the rotating field of the snatch roll 11. At

this point, the component parts of the repeat typing mechanisms are so arranged as to cause the type head 15a to contact the platen 17 most tightly for perfect typing.

When the pawl nose 26f is disengaged from the snatch roll teeth, the pawl member 26 and actuating member 12 are immediately brought back, as shown in FIG. 4, to the original-positions by the

springs

46 and 23 respectively and the type bar 15 is also quickly returned to the position shown in FIG. 1. If, in case the pawl member 26 and-actuating member 12 regain their original positions, the type key still remains depressed to the first position shown in FIG. 8, then the key lever 34 and crank lever 29 retain the positions shown in FIGS. 2 and 3, so that the first lug 32a of the control lever 32 is kept in the return passage of the pawl member 26 and actuating member 12. In their return, however, the underside of the first bent lug 32a is pushed up by the top edge of the engaging arm 26e to cause the control lever 32 to rotate, as shown in FIG. 4, counterclockwise about the shaft 29c, permitting the first bent lug 32a to be removed from the return passage of the pawl member 26 and actuating member 12, thereby permitting the pawl member 26-and the ac tuating member 12 to return to their original positions. Therefore, even when the type key 35 remains depressed to the first position, there is no possibility of the pawl member 26 again engaging the snatch roll 11. The shocks caused when the top edge of the engaging arm 26e contacts the underside of the first bent lug 32a are absorbed by the spring 33 so that the other component parts are saved from unnecessary impacts. When the type key 35 is released from its first position, the other component parts regain the positions shown in FIG. 1, finishing one cycle of a normal non-repeat type action.

There will now be described a repeat typing action. When the type key 35 is depressed, as shown in FIG. 9, while the pawl member 26 and actuating member 12 are being brought back to their original positions of FIG. 4 from the engaged state of FIG. 3, so as to rotate the rest member 42 clockwise against the force of the spring 45 and cause the underside of the horizontal sec tion 34f of the support arm 340 to contact the stop 44 and is kept in this position (hereinafter referred to as a second position), then the crank lever 29, as well as the control lever 32, rotates to a greater extent than in FIGS. 2 through 4 to cause the first bent lug 32a to be brought deep into the return passage of the pawl member 26 and actuating member 12 (FIG. 5). In their return, however, the underside of the first bent lug 32a is pushed up by the top edge of the engaging arm 26e of the pawl member 26 to rotate the control lever 32 so as to remove the lug 32a out of the passage of said return. This operation is the same as'when the type key 35 is depressed to the first position. In the case of a repeat typing action, however, just before the pawl member 26 and actuating member 12 fully regain their original positions, the lower end of the second bent lug 32b engages the lower rear side edge 26h of the engaging arm 26e. As a result, though the spring 46 still applies its force, the engaging arm 26e is immediately rotated clockwise by a cam action conducted by the two surfaces of the first and second

bent lugs

32a and 32b just before said arm 26e is brought back to its original position again to draw the pawl nose 26f into the rotating field of the snatch roll 11. Thus the pawl nose 26f again engages one of the snatch roll teeth as shown in FIG. 6, and as in a non-repeat typing action, the type bar 15 starts typing by the operation of the repeat typing mechanism including the pawl member 26 and actuating member 12. While the type key 35 holds the second position shown in FIG. 9, operation of FIGS. 3 to 5 is repeated to perform a repeat typing action. In the repeat typing action, the bottom end of the second bent lug 32b engages the lower rear side edge 26h of the engaging arm 26e. At this time the engaging point is close to the pivotal shaft 27, so that when. the pawl member 26 is rocked at said engaging point for engagement with the snatch roll 11, the pawl nose 26f remote from the pivotal shaft 27 is immediately urged for engagement with the snatch roll 11.

Just before the pawl member 26 fully regains its original position after repeated actuation, the pawl nose 26f quickly engages the snatch roll teeth. Accordingly, the timing, duration and extent of engagement between the pawl member 26 and the snatch roll 11 are made substantially equal to those which take place in a non-repeat typing action thereby to apply the same magnitude of drive power to the type bar 15 in both typing actions, permitting typing to be made in a uniform shade of color.

Due to the very smooth engagement of the pawl member 26 with the first and second

bent lugs

32a and 32b in a repeat typing action, all the component parts of the repeat typing mechanism regularly perform exactly the same repetitive movements, enabling distinct typing to be conducted at an equal speed an in a uniform shade of color.

The foregoing embodiments relate to the case where the repeat typing mechanism includes a type bar. However, the present invention is also applicable in typewriters using a carriage spacing device and line feed device which have to be operated repetitively.

What we claim is:

l. A repeat typing mechanism for power operated typewriters comprising:

a. a frame;

b. a power driven snatch roll mounted on the frame so as to be continuously rotated in one direction;

c. a driven part actuated by the snatch roll;

d. an actuating member disposed transversally below the snatch roll and having its rear end operatively connected to the driven part;

e. a fixed shaft provided on the frame ahead of the snatch roll so as to have the actuating member rockably mounted about said shaft;

f. means for holding the actuating member normally in a rest position;

g. a pawl member provided with an engaging arm upwardly extending to the rear side of the snatch roll and having a pawl nose detachably engaged with the snatch roll, when not operated, maintained in a position disengaged from the snatch roll and, when operated, engaged therewith to cause the actuating member to rock against the force of the holding means, thereby actuating the driven part;

member so as to cause the pawl nose to engage the I snatch roll upon depression of the key lever and while said lever is held depressed to be pressed against the top edge of the actuating member ac- Y cording to a returning movement of the actuating member, thereby rotating the control lever; and

k. a second bent lug suspended from said one end of the control lever along the rear edge of the engaging arm substantially at right angles to the first bent lug so as to depress the engaging arm upon rotation of the control arm during the returning movement of the actuating member before the pawl member returns to its disengaged position and only while the key lever is maintained at the second position, causing the pawl nose immediately to engage the snatch roll and thereby permitting a repeat typing action while the key lever is maintained at the second position. 2. A repeat typing mechanism for power operated typewriters comprising:

a. a frame;

c. a driven part actuated by the snatch roll;

f. a three-armed pawl member comprised of an engaging arm upwardly extending to the rear side of the snatch roll and having a pawl nose detachably engaged with the snatch roll; a control arm extending substantially horizontally below the snatch roll and provided with a cam surface at the lower part and a pivoted arm extending toward the rear side of the mechanism and pivoted to the actuating member;

g. first holding means for holding the actuating member normally in a rest position;

h. second holding means for holding the pawl member in a normal position with respect to the actuating member so as to keep the pawl nose of the engaging arm disengaged from the snatch roll;

i.- a keylever substantially horizontally positioned transversally, above the snatch rollso as to be depressed to first and second positions;

j. a crankilever pivoted to the rear end of the key lever and mounted on the frame so as to rock according to the depression of the key lever;

k. a control lever rotatably supported at one end of the crank lever, normally maintained in a position disengaged from the engaged arm and, upon depression of the key lever, engaged with the engaging arm to rock the pawl member so as to cause the pawl nose of the engaging arm to engage the snatch roll a ainst the force of the second holding means, there y rocking the actuatlng member to actuate the driven part;

1. disengaging means mounted on the frame just below said cam surface of the control arm so as to disengage the pawl nose of the engaging arm from the snatch roll after the predetermined rocking movement of the actuating member;

m. a first bent lug horizontally attached to one end of the control lever facing the upper part of the pawl member so as to cause the pawl nose to engage the snatch roll upon depression of the key lever and, while said lever is held depressed, to be pressed against the top edge of the actuating member according to a returning movement of the actuating member, thereby rotating the control lever; and

n. a second bent lug suspended from said one end of the control lever along the rear edge of the engaging arm substantially at right angles to the first bent lug so as to depress the engaging arm upon rotation of the control lever during the returning movement of the actuating member before the pawl member returns to its normal disengaged position and only while the key lever is maintained at the second position, causing the pawl nose immediately to engage the snatch roll and thereby permitting a repeat typing action while the key lever is maintained at the secondposition.

3. A repeat typing mechanism according to claim 1 wherein said first bent lug and second bent lug are integrally formed with said control lever.

4. A repeat typing mechanism according to claim 2

Claims

1. A repeat typing mechanism for power operated typewriters comprising: a. a frame; b. a power driven snatch roll mounted on the frame so as to be continuously rotated in one direction; c. a driven part actuated by the snatch roll; d. an actuating member disposed transversally below the snatch roll and having its rear end operatively connected to the driven part; e. a fixed shaft provided on the frame ahead of the snatch roll so as to have the actuating member rockably mounted about said shaft; f. means for holding the actuating member normally in a rest position; g. a pawl member provided with an engaging arm upwardly extending to the rear side of the snatch roll and having a pawl nose detachably engaged with the snatch roll, when not operated, maintained in a position disengaged from the snatch roll and, when operated, engaged therewith to cause the actuating member to rock against the force of the holding means, thereby actuating the driven part; h. a key lever substantially horizontally positioned transversally above the snatch roll so as to be depressed to first and second positions; i. a control lever operatively connected to the key lever so as to cause the pawl nose to engage the snatch roll upon depression of the key lever; j. a first bent lug horizontally attached to one end of the control lever facing the upper part of the pawl member so as to cause the pawl nose to engage the snatch roll upon depression of the key lever and while said lever is held depressed to be pressed against the top edge of the actuating member according to a returning movement of the actuating member, thereby rotating the control lever; and k. a second bent lug suspended from said one end of the control lever along the rear edge of the engaging arm substantially at right angles to the first bent lug so as to depress the engaging arm upon rotation of the control arm during the returning movement of the actuating member before the pawl member returns to its disengaged position and only while the key lever is maintained at the second position, causing the pawl nose immediately to engage the snatch roll and thereby permitting a repeat typing action while the key lever is maintained at the second position.

2. A repeat typing mechanism for power operated typewriters comprising: a. a frame; b. a power driven snatch roll mounted on the frame so as to be continuously rotated in one direction; c. a driven part actuated by the snatch roll; d. an actuating member disposed transversally below the snatch roll and having its rear end operatively connected to the driven part; e. a fixed shaft provided on the frame ahead of the snatch roll so as to have the actuating member rockably mounted about said shaft; f. a three-armed pawl member comprised of an engaging arm upwardly extending to the rear side of the snaTch roll and having a pawl nose detachably engaged with the snatch roll, a control arm extending substantially horizontally below the snatch roll and provided with a cam surface at the lower part and a pivoted arm extending toward the rear side of the mechanism and pivoted to the actuating member; g. first holding means for holding the actuating member normally in a rest position; h. second holding means for holding the pawl member in a normal position with respect to the actuating member so as to keep the pawl nose of the engaging arm disengaged from the snatch roll; i. a key lever substantially horizontally positioned transversally, above the snatch roll so as to be depressed to first and second positions; j. a crank lever pivoted to the rear end of the key lever and mounted on the frame so as to rock according to the depression of the key lever; k. a control lever rotatably supported at one end of the crank lever, normally maintained in a position disengaged from the engaged arm and, upon depression of the key lever, engaged with the engaging arm to rock the pawl member so as to cause the pawl nose of the engaging arm to engage the snatch roll against the force of the second holding means, thereby rocking the actuating member to actuate the driven part; l. disengaging means mounted on the frame just below said cam surface of the control arm so as to disengage the pawl nose of the engaging arm from the snatch roll after the predetermined rocking movement of the actuating member; m. a first bent lug horizontally attached to one end of the control lever facing the upper part of the pawl member so as to cause the pawl nose to engage the snatch roll upon depression of the key lever and, while said lever is held depressed, to be pressed against the top edge of the actuating member according to a returning movement of the actuating member, thereby rotating the control lever; and n. a second bent lug suspended from said one end of the control lever along the rear edge of the engaging arm substantially at right angles to the first bent lug so as to depress the engaging arm upon rotation of the control lever during the returning movement of the actuating member before the pawl member returns to its normal disengaged position and only while the key lever is maintained at the second position, causing the pawl nose immediately to engage the snatch roll and thereby permitting a repeat typing action while the key lever is maintained at the second position.

4. A repeat typing mechanism according to claim 2 wherein said first bent lug and second bent lug are integrally formed with said control lever.