US3001629A

US3001629A - Margin stop for typewriter

Info

Publication number: US3001629A
Application number: US837178A
Authority: US
Inventors: Robert H Mimlitch
Original assignee: International Business Machines Corp
Current assignee: International Business Machines Corp
Priority date: 1959-08-31
Filing date: 1959-08-31
Publication date: 1961-09-26
Anticipated expiration: 1978-09-26
Also published as: GB894220A

Description

Sept. 26, 1961 R. H. MlMLlTCH MARGIN STOP FOR TYPEWRITER Filed Aug. 31, 1959 INVENTOR. ROBERT H. MIMLITCH ATTORNEY.

United States Patent 3,001,629 MARGIN STOP FOR TYPEWRITER Robert H. Mimlitch, Lexington, Ky., assignor to International Business Machines Corporation, New York, N.Y., a corporation of New York Filed Aug. 31, 1959, Ser. No. 837,178 3 Claims. (Cl. 197-63) This invention relates to typewriters, and more particularly to margin stops for limiting the travel of a typewriter carriage.

The conventional typewriter is provided with right and left margin stops which are engaged with a margin control lever for limiting movement of the typewriter carriage at the beginning and end of a line to be typed. The stops are movable to diiferent positions along a margin rack attached to the carriage so the stopping of the carriage may take place at any desired points. It is sometimes necessary that a typewriter be provided with a very long carriage, and that support brackets be connected to the margin rack on such a carriage at points spaced from each of its ends. Margin stops may be arranged on the outer end portions of the margins rack for limiting movement of the carriage when typing on wide record sheets. It is not possible, however, to move these stops inwardly past the supporting brackets and so, if the stops are to be effective, the sheet must be wider than the'distance between the supporting brackets.

By placing on the margin rack between the supporting brackets a stop which can be made selectively effective sides of the brackets are conventional margin stops 3 and 4 which are engageable with a margin control lever 5 for limiting movement of the carriage in either direction.

The control lever 5 and the mechanism associated therewith for stopping the carriage is like that shown and described in Patent 2,872,013 to B. W. Wittwer. It is sufiicient to state here that the lever is provided with an elongated slot 8 slidably receiving studs 9 (only one being shown herein) on a tab lever 10. As the carriage moves to the left in FIG. 1, an abutment portion 12 on the stop 4 engages a shoulder 14 on the control lever and moves the latter to the left until it engages a hook portion 15 on the tab lever, stopping movement of the carriage, When the carriage moves to the right, an abutment portion 16 on the stop 3 engages a projecting portion 18 on the control lever 5 and forces the latter to the right until the left end of the slot 8 engages the stud 9. The movement of the control lever on the studs causes various functions to take place but it is not necessary that they be discussed here.

Each of the stops 3 and 4 comprises a metal plate 20 which is bent to provide an end 21 slidably engaging the or ineffective, and using this with one of the other stops I to control carriage movement, it is possible to obtain a stopping of the carriage at margin points when typing on sheets of any width. The stop between the brackets may be generally like one of the other stops but having associated with it a member which may operate in one position to cam the margin control lever away from an abutment surface on the stop when the latter is made inefiective. By moving the cam member to another position, the abutment surface is engageable by the margin lever to stop the carriage.

top of the margin rack 1. At each side of the plate adjacent its end 21 is a flange 22 bent over to have sliding engagement with the side of the rack. The opposite end of the plate 20 has a flange 24 at each side bent over to engage the side of the rack, and these flanges extend below the rack a suflicient distance to engage the control lever 5. Arranged between the lower portions of the flanges 24 and connected thereto as by welding, is a block 25 having teeth which are engageable with the teeth 26 on the rack 1. Pressed from the plate 20 is a lip 28 supportingoue end of a spring 29 which extends between the open upper ends of the flanges 24 and slidably engages the top of the rack 1. The spring normally holds the end of the stop v carrying the block 25 in a raised position so the teeth An object of this invention is to provide animproved I margin stop for a typewriter.

Another object is to provide an improved margin stop which may be made either etfective or ineffective.

Still another object is to provide a margin stop having ,7

associated therewith a cam member which is movable either to a position for camming a stop element away from an abutment surface on the stop or to a position for exposing the abutment surface to the stop element.

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which disclose, by way of example, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

In the drawings:

FIG. 1 is a rear elevational view of a margin rack having one of the improved margin stops mounted there- FIG. 2 is an enlarged sectional view taken on the line 2-2 of FIG. 1.

FIG. 3 is an enlarged side elevational view of the improved margin stop in operative condition.

There is shown in FIG. 1 a margin rack 1 connected at points spaced from its ends to supporting brackets 2 which are attached to the carriage, not shown, of a typewriter. The carriage is somewhat longer than that ordinarily used to permit typing on Wide record sheets. Conon the block engage those on the rack. By applying a downward pressure to the top of the stop between its ends, the plate 20 swings about its end 21 and disengages the teeth on the block 25 from those on the rack permit-ting movement of the stop in either direction along the rack. It is not possible, however, to move the stops inwardlly beyond the brackets 2 and so another stop 30 is needed when typing on a sheet of paper not as wide as the distance between the brackets.

The stop 30 may be designed to cooperate with either of the stops 3 and '4. As shown herein, it cooperates with the stop 4 and limits movement of the carriage to the right in FIG. 1. Stop 30 is like stops 3 and 4 in that it includes a plate 20 having an end 21 engaging the top of the rack, and

flanges

22, 24 engaging the sides of the rack. It also includes a block 25 connected between the flanges 24 and having teeth which are normally held in engagement with the rack teeth 26 by a spring 29. In addition to this, there is provided a member 32 having

finger portions

33 and 34 slidably engaging opposite sides of the rack 1 and connected to each other by a strap portion 36 extending over the top of the rack. The finger portion 33 lies in the same plane as the flange 24 at the rear side of the rack and has its free end located close to the edge of the flange as shown in FIG. 3. Member 32 is also provided with an arm portion 38 extending along the rear side of the rack, and this arm is oflset slightly from the finger 33 so it passes along the side of the flange 24. On the upper edge of the arm 38 at its left end is a projecting portion 39 which is bent forwardly to overlie the rack 1, and the end 40 of this portion is bent upwardly so an operator may grasp it to manipulate the The right end of the member 32 is shaped at 42 to provide a surface about which the member may rock on a corner of the flange 22. A spring element 44 is held at one end between the plate 20 and the lip 28 and acts at its other end against the lower surface of the projecting portion 39 on the arm 38. This spring normally rocks the member 32 about flange 22 to the position shown in FIG. 3. In such position, the finger 33 lies.

abovethe lower ends of flanges '24 so they are exposed to the control lever 5. Stop 30 is then eflective to limit movement of the carriage in one direction- When the operator presses downwardly on the left end of arm 38, the member 32 rocks to a position in whieh the-lower edgeof finger 33 is in line with the lower end of'fian ge 24. For holding the member in this position, a detenting portion 45 on the arm 38 engages the lower edge of one of the flanges 24, as shown in FIG. 2. Stop 30' is. then ineffective since the finger 33 prevents engagement of the control lever with the lower ends of the flanges 24 and the block 25 forming the abutment portion of the. stop 30.

When the carriage moves to the right in FIG.1 with the. stop member 32 held in its blocking position, the finger 33 acts against the control lever 5 to cam. it and the tab lever downwardlly out of the path of stop 30. The carriage may then continue moving .until'the control lever 5 is engaged by the abutment portion ion the stop 3; Control lever 5 and tab lever 10 are also cammed down wardlly by stop 34) when the carriage moves in the opposite direction. To make stop 30 effective, the operator presses rearwardlly on the upwarlly 'bent portion 40 of the arm 38 to release the detenting portion 45 from the flange 24. Spring 44 then rocks the member 32 upwardly to the position shown in FIG. 3 so the abutment portion of the stop is exposed to the control lever.

While there has been shown in this application one form which the invention may assume in practice, it will be understood that it may be modified and embodied in various other forms without departing from the spirit of the invention.

What is claimed is:

1. The combination with a typewriter carriage and a rack fixed to said carriage, of a stop movable to difierent positions along said rack and adjustable to be'eithereffective or ineffective in actuating a control lever for stopping said carriage,'said stop rcompn'sing a stopmember slid ably mounted on said rack and having an abutment portion engageable with said control lever during movement of'said carriage for actuating said lever, teeth on said stop member cooperating with teeth on said rack for holding said stop member in the position to which it is moved, and a member pivotally mounted on said rack and movable along the latter with said stop member, said pivotally mounted member arranged to pivot between v 4 i v a first position exposing said abutment portion for engagement with said control lever and a second position in front of said abutment portion for deflecting said control lever out of its path.

2. The combination with a typewriter carriage of a margin stop adapted to cooperate with a control lever and adjustable to be either effective or inefiective in actuatingsaid'control lever for stopping said typewriter carriage comprising, in combination, a stop member'mounted on said typewriter carriage and having an abutment portion in a position to engage said control lever during movement of said carriage, a member pivotally mounted on. said carriage and movable between a first position exposing said abutment portion for engagement with said control lever and a second position in front of said abutment portion for deflecting said control lever out ofits path, a spring normally holding said pivotally mounted member in said first position, and detent means operating on movement of said pivotally mounted member to said second position for holding it in such position.

, 3'. The combination with a typewriter carriage of stop 'mcchanisms adapted to cooperate with a control lever for stopping said typewriter carriage at right and left margin points separated from each other any desired distance comprising, in combination, a margin rack,.support ing brackets connected between said carriageand said rack at points spaced inwardly from the ends of the latter, stop members adjustably mounted on the portions of said rack outside said supporting, brackets, each of said stop members having an abutment portion with a surface facing the other member, saidsurfaces engageable with said control lever during movement of said carriage for eflFectingv a stopping. of the latter, a third stop member adjustably mounted on the portion of said rack between said brackets, said third stop member having an abutment portion with a surface facing one of said first mentioned stop members and engageable with said control lever for actuating the latter, and a member pivotally mounted on said rack and movable between a first position exposing the surface onthe abutment portion of said third stop member for engagement with said control lever. and a second position in front of the abutment portion on said stop member for deflecting said control lever out of its path.

References Cited the file of this patent UNITED STATES PATENTS