Abstract: A recording apparatus for performing a recording operation on recording paper includes a recording head for performing the recording operation on the recording paper, a carriage which carries the recording head, and is movable along a convey path of the recording paper, a conveying unit for conveying the recording paper, a drive source, and a lock pawl which is arranged along a moving path of the carriage and can transmit a drive force from the drive source to the conveying unit in accordance with movement of the carriage.

Abstract: For a paper feed operation, it is determined whether printing is being performed. When printing is not performed, the paper feed is enabled even in the on-line state, thereby omitting a vain key operation. Further, a line feed key and a paper discharge key are set as the same key and a paper discharge stop function is provided, thereby enabling the line feed of a large amount to be executed by a smaller number of key strokes.

Abstract: A controller for controlling feeding of paper in a printer in response to a plurality of feed control commands. The printer includes a detector for detecting the presence or absence of paper in the printer wherein a predetermined region remains on the paper at a point in time when the output of the detector switches from an indication of paper presence to an indication of paper absence. The printing control calculates an accumulated value of the paper feed amounts specified by the plurality of paper feed control commands when the commands are successively given. The printing control then predetermines the presence or absence of the printable region based upon an amount corresponding to the printable region and the accumulated value.

Abstract: A printing apparatus includes one detection switch which is operated according to the movements of a carriage and a paper bail unit. The detection signal outputted from the detection switch is used for a control to locate the carriage to an origin position thereof and a control for automatic paper supply. A CPU judges by which one of the carriage and the paper bail unit the detection switch is operated.

Abstract: A paper setting mechanism of a printer for setting a sheet of paper in position around a platen roller for printing desired information includes a paper bail assembly having at least one bail roller, which is pivotally supported and normally biased so as to cause the bail roller to be pressed against the platen roller. The paper bail assembly may be set in a set position in which the bail roller is pressed against the platen roller and it may also be set in a retracted position in which the bail roller is separated away from the platen roller. After insertion of paper, the platen roller is driven to rotate first in the normal direction over a first predetermined amount and then in the reversed direction over a second predetermined amount, which is smaller than the first predetermined amount, whereby the reversed rotation of the platen roller is utilized to cause the paper bail assembly to return to its set position automatically.

Abstract: A printing apparatus is disclosed which comprises a platen roller for feeding a cut paper sheet set on a hopper, a paper bail bar having paper bail rollers used in conjunction with the platen roller to secure the cut paper sheet against the platen roller, and a paper loading mechanism for loading the cut paper sheet by causing rotation of the platen roller at a predetermined angle. The paper loading mechanism includes a paper bail switch for checking whether the paper bail roller is in contact with the platen roller. When it is detected by the paper bail switch that the paper bail roller is released from the platen roller, the platen roller is rotated in the normal direction at a first predetermined angle. When, it is detected by the paper bail switch that the paper bail rollers are in contact with the platen roller, the platen roller is rotated in the reverse direction at a second predetermined angle.

Abstract: A document feed-in device for an electronic typewriter comprises a lower guide member for guiding a document towards a typing line on a platen cylinder and a plate or bar member for guiding the document beyond the typing line. The plate or bar member is carried by two movable levers for moving that member away from the platen cylinder and at the same time actuating a switch for signalling the presence of the document to the electronic control means of the machine, to cause rotation of the platen cylinder so that the document goes beyond the typing line by a predetermined distance such that the top edge of the document is moved into a region in which it is engaged by the plate or bar member to permit typing in a region immediately adjacent to the top edge of the document.

Abstract: A method and system for semiautomatically setting a sheet of paper in a typewriter, printer and the like is provided. In accordance with the present invention, when a manually operable auto-set lever is moved from a first setting position to a second setting position, pressure and bail rollers are moved away from a platen roller around which a sheet of paper is to be set. At the same time, a carriage is moved to a first predetermined position of its travelling path. After inserting the leading edge of the sheet, when the auto-set lever is returned to the first setting position from the second setting position, the platen roller is driven to rotate with the pressure rollers in pressure contact therewith to advance the sheet over a predetermined distance along its line-feed direction and thereafter the carriage is moved to a second predetermined position during which the bail rollers are moved to press the sheet against the platen roller thereby setting the sheet ready for typing or printing.

Abstract: In an advancing device for the motorized vertical displacement of a record carrier in an electrically driven office machine, which device includes an operating element mounted for movement in either one of two directions from a zero position, and members responsive to movement of the operating element in either one of its two directions for displacing such carrier in a respective vertical direction corresponding to the direction of movement of the operating element, the members are made to be responsive to movement of the operating element in at least one direction from the zero position for advancing the record carrier at a rate which increases as the extent of displacement of the operating element from the zero position increases.

Abstract: An apparatus which may be used, for example, for feeding a record medium in a printer. The apparatus includes a rotatable member having means thereon for connection to the platen of the printer, and also having teeth on the periphery thereof and a driving surface thereon. The apparatus also includes a rotatable driving unit having at least one driving member or camming lug thereon to engage the teeth and thereby incrementally rotate the rotatable member as the driving unit is rotated. The apparatus further includes a coupling means moveable between first and second positions whereby the coupling means is operatively disconnected from the driving unit and the rotatable member when the coupling means is in the first position, and whereby the coupling means when in the second position is effective to disconnect the camming lug from the teeth and to also operatively connect the driving unit with the driving surface to continuously rotate the rotatable member as the driving unit is rotated.

Abstract: Paper insertion apparatus for indexing a typewriter to a desired first line printing position is triggered using a position detector cooperating with an operator movable paper hold-down bail. When the paper bail is moved to a withdrawn position relative to the paper feed path, the detector produces a signal that causes a logic processor to access, from a dedicated storage location, a code indicating paper advancing increments corresponding to a desired first line printing position. The processor then commands an indexing drive to advance that number of increments. In a preferred implementation, the operator can condition the typewriter to receive a new first line code into storage by means of the keyboard.By so using the presence of the paper bail in a withdrawn position to input the operator's paper insertion request, problems of automatically clearing the path for the leading paper edge are averted and the natural association of the paper bail with paper handling is exploited.

Abstract: An indexing mechanism for a typewriter provides a signal controlled transfer to a fast paper advance rate, say for semi-automatic paper insertion, while storing the last operator-selected rate. Two cams are employed which influence, through a follower, the engagement point of a pawl of a pawl and ratchet platen drive. One cam is operator positionable to change the portion of its cam profile that is tracked by the follower and, attendantly, the paper advance rate. By arranging a signal-controlled actuator to deflect the positionable cam from operative engagement with the follower, the outer cam, which has a less prominent profile, is enabled to influence the pawl engagement point and provides high speed paper advance. Upon removal of the actuator signal the positionable cam is automatically returned to its operative position i.e., the last operator selected position.

Abstract: Improved apparatus for effecting semi-automatic insertion of paper into a typewriter concentrates operator interactions, (1) to condition the typewriter for a distance input selection and (2) to trigger indexing for paper insertion, so as to merely involve positioning of the paper bail. A detection of the paper bail at a predefined position withdrawn from the paper feed path conditions the typewriter to interpret keyboard actuations--preferably of the number keys--as representing desired first line distances e.g., the "2" key represents a first line one inch from the top of the sheet. And, in a presently preferred implementation, the number keys represent a fixed distance increment (three lines or approximately one half inch) multiplied by the key number.

Abstract: A printer includes a paper transport cylinder which is intermittently driven by a motor to automatically advance the paper by one line each time a line has been printed. In order to advance the paper before printing begins a manually actuable key is provided which, when depressed, couples the transport cylinder to the motor and actuates the motor. The transport cylinder is rotated while the key is depressed to rapidly advance the paper.