DD287228A5 - DEVICE FOR LIFTING AND TRANSPORTING COLOR AND CORRECTION TRANSMITTERS IN ELECTRONICALLY CONTROLLED WRITING MACHINES - Google Patents

Abstract

The invention relates to a space-saving color and correction tape device in an electronically controlled typewriter with a controllable in both directions stepper motor, which also zulaeszt a slight change of the correction tape. Erfindungsgemaesz provided by a stepper motor clutch gear is provided, which is einstückckig connected to an axially acting lift curve, which raises and lowers designed as a receiving part for ribbon cassette and correction tape coils cover plate. The clutch gear also has a radially acting stop, over whose trailing edge and a transport lever a correction tape transport mechanism is driven. In the other direction of rotation of the clutch gear this is braked by correction tape transport lever and stop, in this position the driving motor pinion a tooth gap of the clutch gear gegenuebersteht and an operative position for the ink ribbon is achieved. Via a slip clutch, a Richtgesperre and a gear transmission, the ribbon transport is secured. Fig. 6 {device; Lifting and transporting; Color and correction bands; Typewriters, electronic; Stepper motor, controllable; Direction of rotation, optional; Lift curve, acting axially; 3 breakpoints; friction clutch}

Description

For this 5 pages drawings

Field of application of the invention

The invention relates to a device for lifting and transporting dyeing and correction tapes in electronically controlled typewriters with a controllable in both directions stepper motor.

Characteristic of the known technical solutions

With the DE-PS 3341673 a device is known which by means of a stepping motor, a lifting cam, a friction clutch, a gear change gear, a directional link, a cable transmission, two ribbon forks and a light barrier raises the ribbon 'and transported.

The Korrekturbandhub and transport is performed in this device with the additional resources of a toothed segment with eccentric, a Bowden cable and a ratchet gear. Thus, on the one hand, a high technical effort is required to control and execute all functions, on the other hand, the reliability of different friction and drive torque between clutch, transmission and ribbon Kassetio depends. The non-positive transmission of the drive forces requires a relatively high engine torque (eg friction fit for change gearboxes and torques for Farbba ~ dhub with subsequent ribbon transport).

Tolerances of the series production and differences of the ribbon cassettes must be controlled by clearly differentiated spring, frictional and inertial forces, which must ultimately be applied by a correspondingly powerful motor. With the GM 83353755 another device of this type is known in which by means of curves and follower levers either the ribbon device or the correction belt device can be driven. Several cam tracks have been staggered radially in a base body.

Each of the curves has its own short rotation angle range. While a curve is in working position, the others have a rest. For each function, a separate follower lever with downstream gear is provided. This device has the disadvantage that, taking into account higher writing speeds, the necessary requirements for shock and jerk-free movement and flat curve rise or favorable transmission angle, the cam body in the radial dimension is relatively large and therefore also corresponding mass. The technical complexity of the ribbon transport gear is also relatively large because of the conversion of the rotary-swing rotary motion. Also, the intended step size variation is not entirely arbitrary, but depends on the previous step or the previous position of the Farbbandhub position.

The control of these steps must take into account the previous step and the position of the lift curve. In EP-PS 0191176 a device is described which rotates by means of a stepping motor depending on the direction of rotation a ribbon and a correction tape cartridge and transported both types of tape, so that the respective desired tape enters the writing position.

The control of the sequence of functions is done non-positively by means of a lift curve, acting as a force storage leaf spring and by reversing the direction of rotation.

After printing and lowering the ink ribbon in a visibility position, reverse rotation of ink ribbon transport must be prevented, and after correction, ink ribbon transport may be erroneously performed if the ink ribbon transport power requirement is not much higher than that for the correction tape driver , Both lead to an increased demand for drive energy.

Furthermore, in DD-PS 206110 a belt transport device is described which drives by means of Drehrichtungsumschaltbarem motor both a character-proportional ribbon transport as well as a correction lever device via a pivot lever. The ribbon stroke is effected via an additional magnetically driven device. A correction tape transport device is also described in DD-PS 237 579, in which depending on ^ '! is reduced by the sensed winding diameter of the spent belt, the switching angle corresponding to the growing diameter. The incidence of a transport pawl is controlled in a ratchet gear of a sensing lever by a constant drive movement is decomposed with increasing degree of filling of the take-up reel in an increasing idle stroke and a removable Wirkhub. Disadvantages are the technical complexity and a necessary pivoting away of the spring-loaded feeler lever when changing the correction tape reel. A one-hand operation is not possible. Next finds a tightening pawl use the tightening of the correction tape use, which engages in a saw toothing of a coil plate and is pulled out with a start-up nose of a frame-fixed pin after a certain way from the teeth. The pawl and the teeth reach a tear-off point before the tensioning pawl falls back into the subsequent tooth.

The friction between the starting lug and the pin or pawl causes force peaks, which have an adverse effect on the Antriabsmoment the device.

In DD-PS 227657 a correction tape transport device is described, in which a balanced energy consumption is achieved, but similar similar unfriendly with a control lever scans the diameter of the take-up reel. In DD-PS 227656 it is proposed that a balanced drive energy u.a. to achieve by using a wrap spring as a coupling element in a correction band tensioning device. In the uncoupled state, wrap spring clutches have a residual torque that varies due to manufacturing influences. For mass production therefore a relatively high amount of security is required to drive power.

In DE-OS 3003890 also the use of a wrap spring, coupled with a tension spring proposed for the maintenance of the correction band. This also results in production-related disadvantages of wrap springs. The correction tape device according to DE-OS 3326237 realizes a relatively equal step for the entire tape roll using an effect-linked with a lever lever control lever. This device is also user-friendly.

Object of the invention

The aim of the invention is to avoid the most significant disadvantages of the known technical solutions and to provide a device for lifting and transporting the dyeing and correction tape, which requires a small footprint in addition to a flat design, can be produced with low technological effort, a low and has balanced energy requirements, manages for all functions with a single drive motor and in which the correction band can be easily changed.

Explanation of the essence of the invention

The invention has for its object to develop a dyeing and correction tape lifting and transporting device in which a stepping motor depending on the direction of rotation selectively drives the ribbon-stroke and the character-proportional ribbon transport or correction tape hub and the correction tape transport and thereby independent From the degree of filling of the correction tape coils performs a consistently large transport step and allows easy operation of the device.

According to the invention, a clutch gear drivable by the stepping motor is provided for this purpose, which is integrally connected to an axially acting lift curve which raises and lowers a cover plate designed as an at least part for ribbon cassette and correction ribbon coils.

Furthermore, the stepper motor drives via a gear transmission, which contains a directional lock, a frame fixedly mounted gear, which is operatively connected to a drive plate located in the cover plate and causes a sliding carrier ink ribbon transport in the cassette. In addition, a radially acting stop is arranged on the clutch gear, which drives a correction belt transport mechanism via a lever. Advantageously, the lifting curve consists of a homogeneous path, which reaches its maximum stroke after half a turn. While upon rotation of the clutch gear in a clockwise direction after a fixed predetermined partial stroke of the radially arranged stop cooperates with the lever for the correction tape device and the driving motor pinion faces in this position, a tooth gap of the clutch gear, the lift curve can fully counterclockwise rotate fully and reaches its maximum hub.

Thus, it is effected that with a single stroke curve with only one curved path in the one direction of rotation with a partial stroke, the color hand uplift and in the opposite direction with maximum stroke, the correction band-uplift. During the correction tape return stroke takes place by means of the radially acting path of the stop on the correction tape transport lever, the correction tape transport energy-saving, since the upscale ribbon cassette with cover plate serves as a force storage and so only a small engine power is required.

The transmission chain for the ink ribbon transport is divided into a frame-fixed gear transmission and a driver gear which is mounted in the cover plate and which performs a relative movement to the frame according to the oscillating movement of the cover plate. Due to the advantageous choice of the fulcrum of the cover plate for meshing engagement of the driver gear is no disadvantageous Achsabstandsänderung or change the backlash, but only a desired displacement along the toothing in the axial direction.

Thus, during the stroke in each lifting height of the teeth in engagement and a rotational movement transferable. A Richtgesperre ensures operatively connected to a directional lock the drive of the ink ribbon in one direction only, so that during the lowering of the bands and during the correction tape stroke no torque applied to the ink ribbon cassette. An intermediate slip clutch absorbs the rotational movement.

To relieve the drive motor, a game is provided between the directional barrier and the downstream gear, so that the ribbon transport only after a certain angle of rotation follows the ribbon stroke.

An existing in the clutch gear tooth gap allows further ribbon transport without having to lower the ribbon.

In the basic transmission position, the toothing of the clutch gear is engaged with the motor pinion, so that it is possible to start from this position without slipping in any direction of rotation.

Only on return stroke of the ink ribbon from the writing position, the clutch gear must start from the tooth gap, for which, however, a comparatively low friction torque between the clutch gear and friction wheel is sufficient. During the return stroke of the correction belt, this tooth gap is passed over without stopover and without slip, because in this movement interval, neither larger drive powers are necessary, nor appreciable accelerations occur. The over the radially acting curve driven correction tape transport helmet is always an equal drive movement to a provided with a pulley angle lever on. This in turn actuates a lever which engages on the one hand with an integrally formed leaf spring in an internal toothing of a coil plate and on the other hand is under the action of working as a force storage tension spring.

Together with a frame-fixed arranged leaf spring lever and reel form a Richtgesperre that gives the take-up reel for winding the spent and withdrawn by means of angle lever from the supply reel tape corresponding rotary motion.

The supply reel is under the action of a friction clutch operating as a friction, which reaches its limit force after a running against the force of a tensioning rotary motion, after reaching a stop.

embodiment

The device according to the invention will be explained in more detail below with reference to an exemplary embodiment. Showing:

Fig. 1: side view of the device from the right (Druckstellunp); Fig. 2: Detail of the ribbon driver; Flg. 3: Side view of the device from the left (basic position); Fig. 4: Detail with lift curve and clutch gear; Fig. 5: Detail of Richtrichtperres in ribbon drive; Fig. 6: top view of the device (printing position); FIG. 7: detail of the correction band device (basic position); FIG. Fig. 8: basic position of the clutch gear and the lift curve; Fig. 9: writing position of the lifting cam and the clutch gear Fig. 10: position of the lift curve and the clutch gear with raised correction belt device.

The drive of the device shown in Figure 1 consists of a switchable in its direction of rotation stepper motor 10, the frame-mounted in a bearing plate 9 in the print carriage a writing or similar office machine stores and the motor pinion 25 programmatically a friction wheel 20 and a clutch gear 21 drives.

When the motor pinion 25 in the clockwise direction, the friction wheel 20 and the clutch gear 21 follow the direction of rotation of the Motot ritzeis 25. In the opposite direction of rotation, the clutch gear 21 is stopped by a stop 33 and biased by a tension spring 32 correction tape transport lever 14 in a position in the the motor pinion 25 faces a tooth gap (Figure 6).

The clutch gear 21 and the friction wheel 20 are clamped by a compression spring 22 via the bearing plate 9, the bearing pin 19, the washer 23 and the lock washer 24 against each other. The clutch gear 21 has a toothed, resilient tongue 21.2 for better meshing and is made with the lifting cam 21.1 and the stop 33 in one piece from a homogeneous plastic material.

The lift curve 21.1 consists of an ascending and a descending part. Both cam parts are distributed on each 180 ° rotation angle. A roller 26 transmits the lifting movement of the lifting cam 21.1 on a cover plate 5, and brings the stored on her parts, ribbon cassette 2 and correction tape coils 4; 30, according to the desired function in an operative or basic position (Figure 3).

The friction wheel 20 drives a gear 11, in the inner toothing 11.1, which is designed as Feinvorzahnung, two leaf springs 27.1 of the clutch 27 engage (Fig. 5). The Innvenverzahnung 11.1 and the clutch 27 form a Richtgesperre that passes the rotational movement only in the ribbon drive direction. In the clutch 27 engages a pinion 1.2, which is in operative connection with a driver gear 13 (Figure 5, 6).

The driver gear 13 is mounted in the cover plate 5 and includes a driver 17 which is under the action of a compression spring 18 and secured against rotation, but is mounted axially displaceable. The resilient legs of the driver 17 are snap-guided in slots of the driver gear 13.

The driver 17 is formed for engagement with a sprocket 6 of the ink ribbon cassette 2.

The pinion 12 is entrained by the clutch 27, wherein between the Mitnehmeklauen 12.1 and the associated recesses 27.2 is a game, so that over a certain angle idle arises.

The cover plate 5 is rotatably attached by means of hinge pins 34 to the frame-fixed bearing plate 9 to bring according to the function of the ribbon 2.1 or the correction tape 3 in printing position or to allow the visibility of the font in a normal position.

The mode of action is described in more detail below.

In the basic position, the lifting cam 21.1 and the cover plate 5 is in the in Fig.3; 7 and 8 shown position. Programmatically, the motor pinion 25 of the stepping motor 10 rotates from the basic position counterclockwise to the position shown in Fig.6 and 9th

About the friction wheel 20, the gear 11 and the clutch 27, the rotational movement reaches the pinion 12. In this case, the clutch 27 runs empty until the driving claw 12.1 of the pinion 12 is detected by the end of the recess 27.2 of the clutch 27. Thus, an energy distribution is achieved in an advantageous manner, because at the beginning of An'.riebsbewegung not simultaneously take the lift curve 21.1 and the ribbon drive energy.

The pinion 12 drives the driver gear 13, which contains a against the action of a compression spring 18 axially displaceable driver 17. This driver 17 establishes a positive connection between the driver gear 13 and the sprocket wheel 6 of the ink ribbon cassette 2. Thus, the ribbon 2.1 is transported. When placing the ribbon cassette 2, the driver 17 deviates from the action of the compression spring 18 and snaps into the recess of the spiked wheel 6 after a maximum of one quarter turn (FIG. 2).

A locking spring 8 engages with two leaf springs in a fine toothing of the driving gear 13 and prevents a reverse rotation of the spiked. 6

Due to the blocking effect of the locking spring 8 acts during the reverse rotation, the clutch 27 with its leaf springs 27.1 as overrunning clutch, so that driver gear 13 and pinion 12 remain in position and the clutch 27 corresponding to the determined by the size of the recess 27.2 empty rotation angle only a small Reverse movement makes. The operative connection between the leaf springs 27.1 of the clutch 27 dissolves upon further reverse rotation, so that gear 11 and friction wheel 20 move positively with the motor pinion 25.

By Reuischuuß between the friction wheel 20 and the clutch gear 21, caused by the compression spring 22, the clutch gear 21 passes from the tooth gap in the normal position (Fig. 7 and 8). The resilient toothed tongue 21.1 facilitates the tooth engagement.

The Farbbandhub takes place from the basic position (Figure 3).

The roller 26 is located at the lowest point of the lift curve 21.1. While the motor pinion 25 rotates counterclockwise, the roller 26 and thus the cover plate 5 moves with the ribbon cassette 2 in the printing position according to the increase of the lift curve 21.1.

The lifting movement is terminated when the stop 33 formed on the clutch gear 21 reaches the end of the correction belt transport lever 14 (FIGS. 6 and 9). Since in this position the motor pinion 25 faces the tooth gap of the clutch gear 21, the positive engagement is interrupted.

With the same direction of rotation is now the ribbon transport, without the ink ribbon is lowered. This mode is chosen wild with fast character input, while slow input programmatically, the clutch gear 21 is returned to the home position and the ribbon of the lift curve 21.1 is lowered following. The clutch gear 21 performs at the ribbon stroke from a constant angle of rotation. This angle corresponds to the ι / nchron driven friction wheel 20 an economical minimum ribbon step, which can be arbitrarily increased to realize a Leichenproportional ribbon step.

While the pinion 12 is mounted on a vorgeesteest bearing pin 28, which is in engagement with the pinion 12

Due to the stroke of the cover plate 5, a relative movement between the two gears in the axial direction, namely approximately rectilinear. This makes it possible to transmit a torque in each phase of movement of the cover plate.

The correction tape stroke takes place after rotation of the motor pinion 25 in a clockwise direction until the lifting cam 21.1 its vertex

reached (Fig. 10). The cover plate 5 is raised again by means of roller 26 in its highest position, so that the

Correction tape 3 reaches the impression position. After correction correction, the stepping motor 10 drives in the same direction Direction of rotation, the clutch gear 21 and the lift curve 21.1 and thus the correction tape 3 get back into the Basic position (Fig.8). The device for the transport of the corralctural ligament is shown graphically in FIG. The correction tape transport can be done with rotation of the motor pinion 25 in a clockwise direction. The stop 33 forming

radial curve gives the correction tape transport lever 14 a swinging motion. During a correction function this will happen

Clutch gear 21 in two half steps (each 180 °) once counterclockwise to. The basic position is shown in Fig.7. From this position, the clutch gear 21 moves half a turn. Thereafter, the correction deduction takes place. While

the second half turn after the correction deduction, the stop 33 deflects the Koirekturband transport lever 14 and this vibrates after leaving the stop 33 back.

The croaker belt transport lever 14 moves with its actuating limb 14.2 an angle fork 35, the hinged

a bearing pin 36 is arranged in the right bearing bridge 5.2.

The bearing bridge 5.2 and with it the angle lever 35 lead as Toil the cover plate 5 is a vertical relative movement to Bearing plate 9 off. This results in the point of contact between the correction tape transport lever 14 and the angle lever 35 during

the pivoting movement also a relative displacement. Therefore, the angle lever 35 has a molded cylinder 35.1, which secures the engagement in any relative position to the actuating limb 14.2.

The Winkelhebol 35 is on the one hand with a lever 44 in operative connection and on the other hand carries a guide roller 37, the Guide the correction tape 3 is used. When the correction belt transport lever 14 is driven, the bell crank 35 and lever 44 move synchronously. The Lever 44 is under the action of a tension spring 45 and engages with a molded leaf spring 33.2 in a finely toothed Internal ring gear of the reel plate 41. Together with a leaf spring 5.4, the lever 44 and the coil plate 41 act as directional locking mechanism. In a vibrating drive movement of the correction transport lever 14, the reel plate 41 threatens against Clockwise by a certain angle. The reel disc 41 has a receptacle for a rotationally secured entrainment

a correction tape coil 4. The correction tape 3 leading to this take-up reel comes νσ ι a supply reel 30, which has a mechanism for Verreklurbandstraffung and wraps successively the pulleys 29,37 and 38. Depending on

Position of the angle lever 35 is the exposed, not fqaspiilte tape length different sizes. It is different

The path of the guide roller 37. If the angle lever 31 moves ir basic position, tape must be deducted from the supply reel, since the take-up reel clockwise, tion is locked by the gei illfeste leaf spring 5.4. Swing

Angle lever 35 back to the normal position, so drives the previously cocked lever 44 with its molded Leaf spring 44.2 by the force of the tension spring 45 to the rake reel disc 41 and winds the released correction tape. 3 With increasing winding diameter of the take-up reel, the correction tape reel 4, the required swing angle of the Levers 44 lower. Due to the constant drive angle of the correction tape transport lever 14 always in din same

deflected position, but no longer reaches its starting position with increasing winding diameter, so that increasingly air between angle lever 35 and approach 44.1 arises in the basic position.

In this way, the tape to be wound up according to the correction tape transport step always remains the same size and the Rotation angle of the correction tape reel 4 decreases with increasing winding diameter. The correction tape reel 4 can be changed in an advantageous manner, with a handle, without an additional lever

must be pressed.

The correction band-tightening on the left reel disc 40 consists of a slip clutch and a tension spring 43. Die Carriage coupling is tuned so that it can not be overcome by the tension spring 45, while the tension spring 43 a

has lower tensile force than the tension spring 45.

In detail, the slip clutch consists of the left reel disc 40 with a fine internal toothing 40.1 and a Friction spring 42 with two molded leaf springs 42.2. The tension spring 43 is on the one hand on the pin 42.1 and on the other hand in a spring hook 5.3, which is part of the bearing bridge 5.1,

hooked.

The correction tape supply reel 30 is secured against rotation on the left reel disc 40 and rotatably mounted on the Bearing bridge 5.1 arranged. If correction tape 3 is withdrawn from the supply reel 30, then initially the friction spring 42 also rotates with the reel plate 40

counterclockwise against the force of the tension spring 43 until the pin 42.1 abuts a stoppgest stop 5.5.

Upon further train on correction tape 3, the force of the friction spring 42 is overcome and there is a relative movement

between reel plate 40 and friction spring 42nd

After the transport step, the force of the tension spring 43 acts as a clamping force on the correction tape. 3 During the correction tape stroke or correction tape transport, the motor pinion 25 rotates clockwise and the Gears of the ribbon transport gear run with empty, since the clutch 27 acts as a freewheel in this direction of rotation and

no movement transfers.

Claims (11)

1. A device for lifting and transporting dyeing and correction tapes in electronically controlled typewriters with a controllable in both directions stepper motor, with a friction clutch with which either the ribbon device or the correction belt device is driven, characterized in that a recording as the Ribbon cassette and the correction tape coils serving cover plate (5) of an axially acting stroke curve (21.1) with only one curved path by means of a roller (26) in the one direction of rotation to the ribbon printing position and in the other direction of rotation to the correction ribbon printing position can be raised by a motor-driven, with the lifting cam (21.1) effect connected clutch gear (21) in the first direction of rotation with a stop (33) on a correction belt transport lever (14) abuts while a simultaneously driven friction wheel (20) via a. Gear transmission (11 / 12,13), a clutch (27) and a driver (17), the ink ribbon (2.1) transports, and in the second direction of rotation, the stop (33) forming a radial curve in conjunction with the correction tape transport lever (14 ) drives the correction tape transport mechanism (35; 37; 45; 44; 41; 4). 2. Device for lifting and transporting dyeing and correction tapes according to claim 1, characterized in that in a bearing plate (9) mounted correction tape transport lever (14) with a pivotally mounted in a bearing bracket (5.2) mounted angle lever (35) is operatively connected, which carries a guide roller (37) and with one arm under the action of a tension spring (45) stationary lever (44) actuated, and in that a leaf spring (44.2) in operative connection with a sprocket of the reel disc (41) and one with the cover plate (5) fixedly connected leaf spring (5.4) drives a rotation secured with the reel disc (41) connected correction tape reel (4) in the winding, and that the reel disc (40) of the supply reel (30) via a with an internal gear (40.1) operatively connected friction spring (42) with the in the bearing bridge (5.1) fixedly mounted tension spring (43) is coupled and a pin (42.1) with a stop (5.5) cooperates. 3. Apparatus according to claim 1, characterized in that the coupling gear (21), the lifting cam (21.1) and the stop (33) are made in one piece. 4. Apparatus according to claim 1, characterized in that the coupling (27) with the recess (27.2) to the driving claw (12.1) of the pinion (12) has a torsional backlash. 5. Apparatus according to claim 1, characterized in that the pinion (12) and the driver gear (13) are mutually approximately linearly axially displaceable. 6. Apparatus according to claim 1 and 2, characterized in that the correction band-transport lever (14) on one on the angle lever (35) integrally formed cylinder (35.1) rests. 7. Device according to claims 1 and 2, characterized in that the lever (44) with a projection (44.1), the leaf spring (44.2) and a spring hook (44.3) is integrally formed from a spring-resistant plastic material. 8. Device according to claims 1 and 2, characterized in that the leaf spring (5.4) made of plastic material integrally formed on the bearing bridge (5.2) is formed. 9. Device according to claims 1 and 2, characterized in that the friction spring (42) with two leaf spring arms and a pin (42.1) consists integrally of a plastic material and the internal toothing (40.1) is a fine tip teeth. 10. Device according to claims 1 and 2, characterized in that the force of the tension spring (45) is at least twice as large as the force of the tension spring (43). 11. Device according to claim 2, characterized in that the corrective band Transpo tmechanismus essentially with angle lever (35), umlon roller (37), lever (44) with leaf spring (44.2), with the cover plate (5) fixedly connected leaf spring (5.4), reel disc (41), tension spring (45) of a separate drive is moved.