JPH0446931Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a sensor slit insertion mechanism used for positioning a print head in a printer.

<Prior art> The conventional sensor slit insertion mechanism is shown in Figure 6~
This will be explained based on FIG. 11. 1 is print head 2
This is the platen facing the Reference numeral 3 denotes a carriage that is slidably installed on a main shaft 4 and a subshaft 5, both ends of which pass through a frame (not shown).The cartridge 3 has a printing head 2 mounted on its upper surface and a sensor section 6 on its lower surface. It is provided.

The sensor section 6 has a hole 6a for inserting a sensor slit 7 (see Fig. 7), which has a structure in which a large number of translucent sections 7a are formed in a non-transparent black band-shaped film, and a sensor slit 7 (see Fig. 7). Translucent part 7 of lit 7
A fixed slit 6b facing a, a light emitting part 6c and a light receiving part 6d are provided (see FIG. 8),
A fixed slit 6 is provided between the light emitting part 6c and the light receiving part 6d.
Since there are two slits, b and sensor slit 7, only when the fixed slit 6b and the transparent part 7a of the sensor slit 7 come to opposing positions due to the movement of the carriage 3 (see FIG. 9), Light emitting part 6
The light that exits c passes through two slits and reaches the light receiving section 6d.
It is something that can be reached and recognized. A tension spring 8 is inserted into the end of the sensor slit 7 to prevent the sensor slit 7 from sagging, and is attached to a protruding sensor slit fixing point formed on the frame (not shown). 9 is engaged.

<Problems to be solved by the invention> However, in the conventional example described above, the main shaft 4, subshaft 5, and sensor slit fixing point 9 are independent from each other, so the respective axes of the main shaft 4 and subshaft 5 are The inclination of the sensor part 6 formed on the carriage 3 that slides on the plane passing therethrough may differ from the inclination in the length direction of the sensor slit. The fixed slit 6b and the transparent part 7a of the sensor slit 7 face each other, and the light receiving part 6d
The area where the light reaches (the shaded area in Figure 10) is significantly narrower than in the normal case (the shaded area in Figure 11), so even if the light reaches the printer, it is not recognized, causing the printer to malfunction. The point was hot.

The object of the present invention is to provide a sensor slit insertion mechanism that is free from malfunctions and has good assembly workability.

<Means for Solving the Problems> The present invention has a structure in which a holding part that is fixed on a plane passing through the axes of one end of the main shaft and the subshaft and holds one end of the sensor slit is fitted with the main shaft and the subshaft. a holding part that holds the other end of the sensor slit slidably inserted on a plane passing through the axes of the other ends of the main shaft and the subshaft; The main shaft, the subshaft, and the sensor slit are made up of a sliding type holder that can be moved in parallel and has a fitting part that fits into the shaft and the subshaft, and a tension spring that biases the sliding type holder in one direction. Both the holding parts are formed to correspond to the fixed holder and the slide holder so that the holding parts are parallel to each other.

<Effect> The above technical means works as follows.

Since the two holders holding both ends of the sensor slit exist on a plane passing through the axes of the main shaft and the subshaft, the sensor slit also exists on that plane.

<Example> An example of the present invention will be described based on FIGS. 1 to 5. 1 is a perspective view, FIG. 2 is a front view, FIG. 3 is an exploded perspective view, FIG. 4 is a schematic view of the sensor section, and FIG. 5 is a front view of the sensor slit.

First, the configuration will be explained. 21 is a frame made of synthetic resin, and the frame 21 has a bottom surface 22 and a bottom surface 21.
It consists of two side plates 23, 23 located at both ends of the bottom surface 21 and perpendicular to the bottom surface 21. 24 connects both ends to the side plate 2
The platen 24 is rotatably supported by notches 23a, 23a provided in the printers 3, 23, and the platen 24 faces a print head 26 mounted on a carriage 25. The carriage 25 has both ends attached to the side plate 2.
It is slidably provided on the main shaft 27 and subshaft 28 passed through the holes 23b, 23b, 23c, 23c, and a sensor slit 30, which will be described later, is provided on the lower surface as shown in FIG. hole 29a for inserting, fixed slit 2
A sensor section 29 having a light emitting section 9b, a light emitting section 29c, and a light receiving section 29d is formed perpendicularly to the lower surface. 3
In particular, as shown in FIG. 5, a large number of transparent parts 30b were formed perpendicularly to the length direction of the film on a non-transparent black strip-shaped film having holding holes 30a, 30a at both ends. The sensor slit 30 is connected to the sensor part 2.
9, the light transmitting portion 30b is detected. 31 is a rectangular plate-shaped sliding holder made of synthetic resin for holding one end of the sensor slit 30, and the main shaft 27 is inserted into the sliding holder 31 with the same width as the diameter of the main shaft 27. a long hole 32 for the subshaft 28 with the same width as the diameter of the subshaft 28;
8, a cylindrical protrusion 34 for insertion into the hole 30a provided at the end of the sensor slit 30, a hole 35 for the sensor slit 30 to pass through, and the hole 35. A rectangular convex portion 36 having one side in contact with , and an engagement piece 37 for engaging with a tension spring 39 described later are formed.
Note that the center line of the hole 32, the center line of the hole 33, and the protrusion 3
The center points of 4 are arranged on a straight line.
38 is a sensor slit presser for holding the sensor slit 30 inserted into the protrusion 34 so that it does not fall out;
8 is a rectangular plate having a hole 38a, and is fitted into the recess 36 with the protrusion 34 inserted into the hole 38a. Tension spring 39
The slide-type holder 31 is biased in one direction by engaging one end with the protrusion 23e of the side plate 23 and engaging the other end with the engagement piece 37 of the slide-type holder 31. 40 is a rectangular plate-shaped fixed holder made of synthetic resin for holding the other end of the sensor slit 30, and the fixed holder 40 has a hole having the same shape as the main shaft 27 and for inserting the main shaft 27 therethrough. A hole 41, a long hole 42 having the same width as the diameter of the subshaft 28, through which the subshaft 28 is inserted, and a cylindrical projection (not shown) to be inserted into the hole 30a provided at the end of the sensor slit 30. ), a hole 43 through which the sensor slit 30 passes, and a rectangular recess (not shown) that is in contact with the hole 43 on one side. That is, the fixed holder 40 has a shape in which the elongated hole 32 of the sliding holder 31 is replaced with a hole 41 and the engaging piece 37 is removed. Reference numeral 44 denotes a sensor slit holder. The sensor slit holder 44 has a hole 44a and is fitted into a recess in the same manner as the sensor slit holder 38.

Next, a method for inserting the sensor slit 30 into the printer will be explained. First, align the hole 41 of the fixed holder 40 with the main shaft 27,
The elongated hole 42 is aligned with the subshaft 28 and inserted at the same time. Next, insert the hole 30a formed at the end of the sensor slit 30 into a protrusion (not shown),
Press the sensor slit with the sensor slit presser foot 44 so that it does not fall out. (Insertion of the fixed holder 40 into the main shaft 27 and subshaft 28 and insertion of the sensor slit 30 into the fixed holder 40 may be done first.) Next, insert the sensor slit 30 into the fixed holder 40. Hold the unfixed end of the holder, pass it through the hole 43 of the fixed holder 40 and the hole 23d formed in the side plate 23 opposite to the hole 43, and then insert it into the sensor section 29 formed on the lower surface of the carriage 25. Through the hole 2 of the opposite side plate 23
3d and the hole 35 of the slide type holder 31 which has not yet been inserted. And the elongated hole 32 of the sliding holder 31
along with the main shaft 27, and the elongated hole 3.
3 to the subshaft and insert them at the same time. Furthermore, the hole 30a formed at the end of the sensor slit 30 is inserted into the protrusion 34, and the sensor slit holder 38 is pressed to prevent it from falling out. (Insertion of the sliding holder 31 into the main shaft 27 and subshaft 28 and sensor slit 30
Either of the two may be inserted into the sliding holder 31 first. ) Finally, tension spring 39
between the protrusion 23e of the side plate 23 and the sliding holder 3.
1, the sliding holder 31 slides and the sensor slit 30
Pull the end of the sensor slit 30 to eliminate slack and complete the insertion. At this time, the sliding type holder 31 and the fixed type holder 40 are reliably located on a plane passing through the respective axes of the main shaft 27 and the subshaft 28 due to their structure, so that the sensor slit 30 held by these
The inclination in the longitudinal direction also coincides with the plane. Further, the lower surface of the carriage 25 that slides on the main shaft 27 and the subshaft 28 is naturally parallel to the plane, and the sensor section 29 provided perpendicular to the lower surface is perpendicular to the plane. Therefore, the light-transmitting portion 30b of the sensor slit 30 whose longitudinal inclination coincides with the plane.
The inclinations of the fixed slits 29b in the sensor section 29 perpendicular to the plane coincide with each other. This is due to the structural properties of the above parts, so no matter what inclination the main shaft 27 and subshaft 28 have, simply by assembling them, the fixed slit 29b and the transparent part 30b of the sensor slit 30 will always face each other at the same inclination. Therefore, there is no misidentification due to insufficient amount of light reaching the device, and no malfunction occurs due to this.

It goes without saying that the same effect can be obtained whether the fixed holder or the sliding holder is attached to either the left or right side.

<Effects of the invention> As explained above, according to the invention, the sensor slit insertion mechanism is fixed on a plane passing through the axes of the main shaft and subshaft, and one end of the sensor slit is held. a holder, a sliding holder that is slidably inserted on a plane passing through the axes of the main shaft and the subshaft and holds the other end of the sensor slit, and a tension spring that biases the sliding holder in one direction. The sensor part is formed on a carriage that slides parallel to the axes of the main shaft and subshaft, and the sensor is held in a sensor holder inserted on a plane that passes through the axes of the main shaft and subshaft. Since the sensor slits and the sensor slits are always on the same plane without any adjustment during assembly, there are no malfunctions due to erroneous recognition of the sensor, and there are significant practical effects such as good assembly workability.

[Brief explanation of the drawing]

Figures 1 to 5 all show one embodiment of the present invention, with Figure 1 being a perspective view, Figure 2 being a front view, Figure 3 being an exploded perspective view, and Figure 4 being a schematic diagram of the sensor section. , 5th
The figure is a front view of the sensor slit, Figures 6 to 11.
All figures show conventional examples; Fig. 6 is a front view, Fig. 7 is a front view, and Fig. 7 is a front view.
The figure is a front view of the sensor slit, Figure 8 is a schematic diagram of the sensor section, Figure 9 is a diagram explaining the relationship between the fixed slit and the sensor slit, and Figure 10 shows the area where light reaches in an abnormal state. 11 are diagrams showing the area where light reaches in a normal state. 25...Carriage, 26...Print head, 2
7...Main shaft, 28...Subshaft,
29...sensor section, 30...sensor slit, 31...sliding holder, 39...tension spring, 40...fixed holder.

Claims (1)

[Scope of utility model registration request] In a printer that controls the position of the print head mounted on the carriage by detecting the light-transmitting part of the sensor slit with a sensor section installed on the carriage, it is possible to a fixed holder having a holding part that is fixed to and holds one end of the sensor slit, and a fitting part that fits with the main shaft and the subshaft; a parallel movable sliding holder comprising a holding part that is slidably inserted into the sensor slit and holds the other end of the sensor slit, and a fitting part that fits with the main shaft and the subshaft; and a tension spring biasing the main shaft, the subshaft, and the sensor slit are parallel to each other, and the holding portions are formed to correspond to the fixed holder and the slide holder. Sensor slit insertion mechanism for printers.