JPS6241814Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field and Purpose This invention relates to a margin position detection device for detecting the left and right margin positions of a printer, and its purpose is to have a simple configuration and be inexpensive to manufacture. An object of the present invention is to provide a novel margin position detection device that can reliably detect each margin position.

Embodiment Hereinafter, an embodiment embodying this invention will be described with reference to the drawings. As shown in FIG. A platen 3 is rotatably mounted on the carriage 2. and,
Based on the pressing operation of a print key (not shown) provided in the front of the main body 1, a printing mechanism equipped with a petal-shaped type wheel, a printing hammer, etc. is driven, and predetermined type is printed on the printing paper on the platen 3. , the platen 3 is moved leftward together with the carriage 2 for each printing operation.

A margin rack 4 is fixed on the carriage 2 at the rear of the platen 3, and a number of teeth 4a are formed at a predetermined pitch on its lower edge. A pair of margin stops 5 and 6 for setting left and right margin positions are movably mounted on the margin rack 4, and each margin stopper 5 and 6 has an operation knob 7 provided with an index 7a. , an engagement piece 8 having a substantially triangular shape, three guide pieces 9, one engagement protrusion 10 that can be engaged with the teeth 4a of the rack, and a direction in which the engagement protrusion 10 is engaged with the margin rack 4. Each is provided with a leaf spring (not shown) for urging. Then, based on the pressing operation of the operating knob 7, each margin stopper 5, 6 is moved in the left-right direction while the engaging protrusion 10 is disengaged from the teeth 4a of the margin rack 4 against the spring force of the leaf spring. The movement can be adjusted as appropriate.

As shown in FIGS. 1 and 2, below the margin rack 4, a support shaft 11 is supported on the main body 1 so as to be movable in the left-right direction by three bearings 12a, 12b, and 12c. The support shaft 11 is biased rightward by the spring force of a compression spring 14 interposed between a stopper 13 fixed to its right end and a right bearing 12a. The retaining ring 15 fixed to the support shaft 11 allows the support shaft 11 to
movement to the right is restricted. A first support member 16 having a substantially U-shaped cross section is supported on the support shaft 11 between the left and center bearings 12b and 12c so as to be relatively movable in the left and right direction, and a pair of retaining rings 17
The relative movement position to the left is restricted by this. A carriage stopper 19 is fixed onto the first support member 16 by a pair of screws 18, and the upper edge of one side of the carriage stopper 19 is engaged with the inner edge of the engaging piece 8 of each of the margin stops 5, 6. The engaging portion 20 is provided in a protruding manner so as to be able to do so.

As shown in FIGS. 1-3, the central bearing 12
A second support member 21 having a substantially U-shaped cross section is supported on the support shaft 11 between the bearing 12a and the right bearing 12a by a pair of retaining rings 22 so as not to be relatively movable.
A detection element 23 consisting of a reed switch or the like is fixed to the bottom wall portion with a screw 24. A third support member 25 is inserted and supported by the support shaft 11 so as to be movable in the left-right direction along the guide wall 26 on the main body 1 so as to sandwich the left side of the central bearing 12b and the second support member 21. A detected object 27 made of a permanent magnet is attached to the lower surface of the right support portion 25a so as to face the detection element 23, and between the right end surface of the support portion 25a and one retaining ring 22. A compression spring 28 is wound around the support shaft 11 . Then, due to the spring force of the compression spring 28, the lower end 25b of the third support member 25 engages with the protrusion 26a of the guide wall 26, thereby causing the third support member 25 to engage with the projection 26a of the guide wall 26.
5 relative movement position to the left is restricted. Furthermore, the detection element 23 and the detected object 2
7 constitutes a detector 29, and when each margin stopper 5, 6 and the engagement portion 20 of the carriage stopper 19 are engaged, a deviation occurs in the opposing positional relationship between the detection element 23 and the detected object 27. That detector 29
A predetermined electrical signal is output from the terminal.

Next, the operation of the margin position detection device configured as described above will be explained.

First, before starting the printing operation, the left and right margin stoppers 5 and 6 are moved and adjusted left and right on the margin rack 4 by operating the operation knob 7 to set the left and right margin positions of the printing paper, respectively. Thereafter, the carriage 2 is moved to the right and a predetermined printing operation is started with the left margin stopper 5 on the margin rack 4 engaged with the engaging portion 20 of the carriage stopper 19. The carriage 2 is moved to the left one character pitch at a time during each printing operation, and when a predetermined number of characters have been printed on the printing paper, the engaging piece 8 of the right margin stopper 6 moves to the left by one character pitch.
It engages with the engagement portion 20 of 9. Based on this engagement,
The carriage stopper 19 is moved to the left together with the first support member 16, and due to the engagement between the retaining ring 17 and the first support member 16, the carriage stopper 19 is moved against the support shaft 11 against the spring force of the compression springs 14 and 28. The second support member 21 that supported the detection element 23 is integrally moved to the left, and the projection 26 of the guide wall 26 is moved as shown in FIG. 4a.
A predetermined amount of deviation occurs in the opposing positional relationship between the detected object 27 on the third support member 25 whose movement to the left is restricted at point a and the detection element 23 on the second support member 21 . Then, the right margin position is reliably detected according to the deviation, a predetermined electric signal is output from the detector 29, and based on the electric signal, the subsequent printing operation and advancement of the carriage 2 are invalidated. Then, the printing operation for one line from the left margin position to the right margin position is completed.

After this printing operation is completed, when the carriage return key (not shown) is pressed and the carriage 2 is moved to the right, the engagement piece 8 of the left margin stopper 5 is moved to the engagement of the carriage stopper 19. The first support member 16 is moved to the right together with the carriage stopper 19 based on the engagement, and the first support member 16 is brought into contact with the third support member 25. As shown in FIG. 4b, the third support member 25 that supported the detected object 27 against the spring force of the compression spring 28 is moved to the right, and the connection between the detected object 27 and the detection element 23 is moved to the right. A deviation occurs in the facing positional relationship. Then, the left margin position is reliably detected according to the deviation, a predetermined electric signal is output from the detector 29, the subsequent return operation of the carriage 2 is stopped, and the printing operation of a new printing line is continued. It can be performed.

Note that this invention is not limited to the above-mentioned embodiments; for example, the detection element 23 may be attached to the third support member 25, the detected object 27 may be attached to the second support member 21, etc. It is also possible to arbitrarily change the configuration of each part without departing from the spirit of this invention.

Effects As detailed above, this invention provides a pair of margin stops for setting the left and right margin positions on the carriage movably held in the main body; By supporting the detector consisting of the detection element and the object to be detected so that it can move in the same direction as the carriage movement direction, a separate detector is installed corresponding to each margin stopper in order to detect the left and right margin positions. There is no need to provide a , the structure is simple and can be manufactured at low cost, and the left and right margin positions can be reliably detected, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment embodying this invention, Fig. 2 is a plan view, Fig. 3 is a sectional view taken along line 3-3 in Fig. 1, and Fig. 4a is a cross-sectional view of the second embodiment. FIG. 4B is a front view of the main part showing the moving state of the detection element on the support member, and FIG. 4B is a front view showing the moving state of the detected object on the third support member. Main unit...1, Carriage...2, Platen...
3, Left margin stopper...5, Right margin stopper...6, Carriage stopper...1
9. Detection element...23, Detected object...27, Detector...29.

Claims (1)

[Claims for Utility Model Registration] A carriage 2 movably held in the main body 1 and on which a platen 3 is placed; a carriage 2 provided on the carriage 2 so as to be movably adjustable;
A pair of left and right margin stoppers 5 and 6 for setting left and right margin positions; and a pair of left and right margin stoppers 5 and 6 provided on the main body 1, when the carriage 2 reaches the left and right margin positions. The detection element 23 and the object to be detected 27 are respectively supported by the main body 1 so as to be movable in the same direction as the carriage movement direction. a detector 29 which outputs an electric signal when the two move relative to each other by a stopper 19; By configuring one of the detection bodies 27 to move and the other to move when the carriage 2 reaches the right margin position, an electric signal is sent from the detector 29 when the carriage 2 reaches the left or right margin position. A printer margin position detection device that outputs .