DE2010271C - Device for switching a print head for writing and printing units - Google Patents

Description

3 4

increases and after passing through a maximum like-shaped coupling lever 55 is with the

that falls away. Coupling member 17 connected.

The invention is described below with reference to the ratchet wheel 49 is also a bolt 59

Drawings explained in an exemplary embodiment. arranged eccentrically, which is in a

It shows the direction of movement of a sliding block movable in one plane

F i g. 1 is a diagrammatic representation of the guide groove 63 engaging with the sensor plate 61.

Writing mechanism with the print head, which is the output member of the drive 41, 49,51,59,61,

F i g. 2 shows a section through the slide plate 61 formed by the counterpart of the invention 63, 65 in the carriage 5

stood, guided in a longitudinally movable manner and has a toothing 65

F i g. 3 shows a section through the printing unit according to io, which is connected to a coupling member 17

F i g. 1 is constantly in engagement with pictorial individual parts of the inventive switching pinion 67,

object and £} _as coupling member 17 with switching pinion 67 is in the

F i g. 4 shows a horizontal section through the carriage 5 displaceable against the force of a spring 69

Printing unit according to Fig. 1 with the invention counter and rotatably mounted,

was standing. ₁₅ £) i _e mode of operation of the switching device 60 is

According to FIG. 1 is one on an axis 1 and one following: For the purpose of switching the main printing shaft 3 along a paper roller 4, the head can be moved from the normal to <* '". a toggle key is actuated - ie the stop lug 37 ger print head 7 with its circumference in rows of the coupling sleeve 36 released. The wrap spring 39 and columns arranged character types moving ao then closes, and which is arranged verbunlich with the shaft 41. The bushing 43 is connected to the circumferential bushing 35

In this embodiment the pressure has coupled. The ratchet wheel 49 is driven here head two sectors, which are the two halves of the and acted upon via the cam 53 of the Nockenfol print head correspond, the normal characters geelement 57, the clutch lever 55 in Ge (lower case) on one and the Umscha'.Tze- 35 is pivoted clockwise and the cup (Capital letters) on the other half anglief * 17 couples with the driving pin 12, are ordered. In the normal position of the Druckkoo- Here, the coupling member 13 of the gear 15 fes 7 is half with the normal row disengaged from the driving pin 12 and in the switching position half with the Um and on the shaft 9 against the action of the reset switching characters 19 moved in a starting position opposite 30 spring. The coupling process of the coupler Printing underlay 4. The print head 7 is here on management member 17 with the driving pin 12 must a shaft 9 is arranged, the lower end of which takes place in quickly, since at the same time as the rotation of the a movable carriage 11 is rotatably mounted. Ratchet wheel 49 the link plate 61 over the in his With this lower end of the shaft 9 a pin 59 engaging guide groove 63 is acted upon Merbolzen 12 firmly connected, which is alternately with 35. Since the curve of the cam 53 accordingly from one Coupling member 13 is formed on a gear 15 and and the sequence of movements of the scenes a further coupling member 17 can be coupled. Plate 61 is sinusoidal, is a safe coupling pass Gear 15 is guaranteed on the shaft 9 against the force process. During the toggle testers Spring 19 is arranged displaceably and meshes with the outlet facing the writer a toothed output member 21 of a differential 40 position pivoted by 180 ° and in the working position Lialhebelsystem for the rotary setting of the pressure compared to the pressure pad 4 is brought here head 7, which is arranged on the carriage 5. half of the printhead with the home position

Rotated by a drive pinion 23 on the main shaft 3 into the scribe's field of vision (see FIG. 2).
is via the gears 25, 27, the shaft 29 and after half a revolution of the shaft 41, the gear 31, the gear 33 is driven. This 45, the drive 41,49,51,59,61,63,65 stopped again-gear 33 is rotatable on a shaft 41 with a clutch lever 55 firmly connected in its output-mounted socket 35. The shaft 41 is in position and the driving pin 12 is again connected to a further bushing 43, which can be coupled to the bushing 35 via a wrap spring 39 that is coupled to the coupling member 13 of the gearwheel 15. The print head 7 can be controlled from the starting position with the stop lug 37 via the coupling sleeve 36 50 system via the differential lever (not shown). tion then discontinued. On return of the shift key

The shaft 41 is in a socket 45 of the carriage 5, the shaft 41 for a second half turn and released rotatably in a bearing block 47 on the carriage 5, the starting position now being restored stored. In this bearing block 47, a ratchet wheel 49 has come into working position. The switching process rotatable arranged, which follows with a on the shaft 41 55 exactly as described above, since the arranged drive pinion 51 constantly meshes. . Cam 53 symmetrical and acting on both sides.

The ratchet wheel 49 has a double-sided action is formed.

the cam 53 on, which is connected to a carriage 5 The invention can be rotated by using mounted clutch lever 55 arranged known means also for the segment switching Cam follower element 57 cooperates. The fork-60 uses willows.

1 sheet of drawings

Claims (1)

1 2 Character types in rows and columns with the same Claims: rather distributed "are arranged with the printhead from the center in the area of each sector 1 device for switching from oppositely arranged starting positions differential adjustment a pressure pad can be brought into working position 5 bar. Ren sectors of a print head mounted on an earth of a rotatable By the German patent 107J59I and carrier shaft for the USA. -Patentschrift 2 919 002 are switchover and printing works on which character types dir <yr. for a spherical printhead in rows and columns with equal distribution, the surface of which is arranged in two halves, the printhead being divided from the middle in the io, with one half normal characters and area of each sector arranged from the other half the changeover gear position can be set differentially in the same distribution, is marked. When pressed a. Shift key characterized in that the print head rotates 180 ° so that the shaft (9) carrying the print head is releasable from the type, so that the coupling mechanism (13, 15) controlled by the code elements is the same As with the normal part (left for the duration of the switching process position, only that the starting position of the spherical element can be positively coupled via a coupling element (17) with a head by 180 from that in the normal shifting drive element (61, 67). the one triggered by a shift key, the print head is switched over continuously running rotary movement of an ao guided by a roller that can be acted upon Drive (41, 49, 51, 59,61,61,65) in a sinus steel band, one end of which is at one type: n- shaped retrieving rotary motion. Carrier carriage and with the other end on one 2. Device according to claim 1, characterized lie denotes a Typentiagerwelle associated disc, that the drive (41, 49, is fastened ^E;. Ne spiral spring is constantly the disc 51, 59, 61, 63, 65) as a cross-crank mechanism 35 in such a way effective that the steel band is constantly tensioned and is over one of a switching. This type of switching is less suitable for higher adjustment button controllable coupling (35, 36, 37, 39, 43) with speeds, since the pressure exerts a rotating drive part (33, 35) coupling head when it moves into the switching position the bar is. Starting position slightly overturned. The imprint 3. Device according to Ansj: also 1 or 2, that can only occur after a certain time, if characterized in that the drive (41, 49, the print head has calmed down, especially with very (4) movable carriage (5) is arranged. switching processes takes a lot of time, which the first 4. Apparatus according to claim 1, thereby considerably impairing the performance of the machine,
indicates that the coupling member (17) has cutouts (18) overlying 35 through the German Offenlegungsschrift 1 809 831, which has become known with an advantageous embodiment of the above invention arranged in the carrier shaft (9), in which the latch bolt ( 12) with the help of a double-sided normal and toggle characters acting as desired cam (53) and one of which can be overridden without the need for a special coupling lever (55) that can be coupled 40 rer work cycle of the machine. Here, the dead times are reduced, but that 5. Device after one of the preceding over-throwing of the print head when setting in Claims, characterized in that one of the starting positions cannot be reversed here either Avoid running drive parts (33, 35) over the coupling. In addition, the reset time of the pressure (36, 37, 39) with a 45 head mounted on the shaft (41) in the starting position of the force of the Bushing (43) of the drive (41, 49, 51, 59, 61, 63, return spring dependent. 65) can be coupled, on which a drive pinion (51) The object of the invention is to provide a is stored, the gearing of which with an internal switching device for a print head to sheep gearing of a rotatable fen in a bearing block, which is as simple as possible in structure, the top (47) mounted ratchet wheel (49) meshes that the 50 guided delay times and overshoot -Switching wheel (49) avoids the cam (53 and an eccentric) and has a controlled positive, seated bolt (59) that the pinus-shaped movement of the printhead in one of the zen (59) in a direction transverse to the direction of movement of a switching position enables
slide plate (61) movable in one plane This object is achieved according to the invention by running guide groove (63), and that 55 is achieved by the fact that the shaft carrying the print head has a toothing (65) releasable from the type setting mechanism via a coupling plate (61), which is constantly in positive engagement with a coupling member with an output member for the duration of the switching process via a connected switching pinion (67) with a coupling member (17) part. Sig can be coupled, the one by a shift key 60 triggered, continuously running rotary movement of a drive into a sinusoidal rotary motion reshaped. This measure makes the switchover of the type carrier very reliable. The invention relates to a device for changing the setting mechanism for the individual types switch from opposite to a printing document in Ar- 65 here separated during the switchover and Brits position bringable sectors of a instead of a drive is switched on, which the End of a rotatable carrier shaft mounted pressure type carrier issued a movement whose speed Koofes for writing and printing units, on which speed is slow at first according to a sinusoidal curve