JPS6038185A - Carriage traverse feed apparatus of serial printer - Google Patents

Abstract

PURPOSE:To prevent the lowering the positional accuracy of a carriage by equalizing the spring constant due to the position of the carriage, by stretching wire ropes different in spring constant across the carriage and a driving drum. CONSTITUTION:A carriage 7 supporting guide shafts 7a, 7b in a freely slidable manner and a drive drum 10 provided out of the traverse feed range of the carriage 7 are connected by two kinds of wire ropes 8a, 8b different in spring constant and positional determination of the carriage 7 is controlled while the traverse feed of the carriage 7 is performed by said wire ropes. Two kinds of wire ropes 8a, 8b are selected so that the spring constant of the part present between the carriage 7 and the drive drum 10 becomes equal at both traverse feed terminal positions of the carriage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates firstly to the structure of a serial printer (carriage traversal), and more particularly to a carriage traversal structure using a rope system such as a wire rope as a power transmission means.

Conventionally, in this type of serial printer, a carriage equipped with a print head is slidably held on a guide shaft, and the carriage is moved horizontally using a stamping motor or servo motor as a drive source via a wire rope used in a rope system. In addition, the positioning was controlled.

In order to satisfy the carriage lateral feed position accuracy,
It is ideal for control that the spring constant of the rope system does not vary depending on the carriage position, and therefore the wire rope winding section of the drive source is usually located in the center of the carriage traversing section. .

However, if the drive motor and wire rope winding section are located in the center of the carriage transport section as described above, the mounting efficiency often decreases due to the arrangement structure, which poses a problem when downsizing the serial printer. was. To deal with this problem, as shown in Figures 1 and 2,
A structure has been adopted in which the drive motor and wire rope winding section are removed from the center and positioned at the left or right end.

In Fig. 1, reference numeral 1 denotes a drive motor as a drive source, which holds the carriage 2 slidably on the guide shafts 7) 2a and 2b, and moves the carriage 2 across the wire rope 3 constituting the rope system for positioning. It is. The path of the wire rope 3 is maintained by a plurality of guide pulleys 4. A drum 5 attached to the drive motor 1 has a spiral groove, and is adapted to move the carriage 2 while winding one side of the wire rope 3 and releasing the other in accordance with the rotation of the drive motor 1.

With this conventional structure, the spring constant of the rope system at the carriage position is higher when the carriage 2 is on the left side as shown in Figure 2, and is higher than when the carriage 2 is on the right side as shown in the figure. The fluctuations are too large, making it difficult to control the carriage traversal movement, and the carriage position accuracy is reduced.

By doing so, it is possible to eliminate the imbalance in the spring constant due to the carriage position, and to provide a carriage cross-feed system for a serial printer that can solve the above-mentioned drawbacks even if the drive source lobe winding section is not located in the center of the carriage feed section. That is. Specifically, a serial printer is used in which a carriage slidably held on a guide shaft and a power source are connected by a rope system, and the carriage is transversely conveyed and positioning is controlled via the rope system. In the carriage cross-feeding structure, the rope system has the same spring constant #1 in the portion between the gear ridge and the drive source at the end position of the carriage's traverse feed, and two types with different spring constants. It is an object of the present invention to provide a carriage cross-feeding structure for a serial printer characterized by being equipped with a rope.

The present invention will be explained below based on an embodiment shown in FIGS. 3 to 5.

6 in the figure is the drive motor as the drive source (guide shirt)
7a and 7b, and is connected to a carriage 7 on which a print head (not shown) is mounted, by two types of wire ropes ga and gb having different spring constants constituting a rope system, and through these wire ropes ga and gb. The carriage 7 is moved laterally and its positioning is controlled. These wire ropes 8a
, 8b are maintained in their path by a plurality of guide pulleys 9a, 9b, and 9c. In the figure, 1O is a drum having a spiral groove and winding the wire ropes 8a and 8b on one side and unwinding them on the other side while moving the carriage 7 laterally. Furthermore, l
la and llb are wire rope attachment parts.

Here, the distance between the carriage 7 and the guide pulleys 9a and 9C is the lateral feed i of the carriage 7, and the drive motor 6
and guide pulley 9a, guide pulley 9a and carriage 7
The spring constant of the wire rope 8a between kl #
kX, and the spring constants of the wire rope 8b between the drive motor 6 and the guide pulley 9c, between the guide pulley 9C and the guide pulley 9b, and between the guide pulley 9b and the carriage 7 are respectively '3. If we set '2゜k' (L-X) to , then Figure 4 (b)
The state shown in is reached. Wire ropes 8a having different spring constants so that the spring constants of the rope systems at X-ki 0 (first printing column) and X-ki L (last printing column) are the same for the lateral movement i If 8b is selected, the spring constants of at least the portions that are fed out from the drum IO at both the left and right end positions of the carriage 7's feeding section will be approximately the same. That is, although the spring constant is not constant over the entire transport section of the carriage 7, it becomes a substantially uniform spring constant as shown in FIG.

As explained above, according to the present invention, a rope system is formed by attaching 2ffl ropes having different spring constants to a carriage slidably held on a guide shaft and hanging it around a power source. At the same time, the spring constants of the two types of ropes are approximately the same at both end positions of the carriage's lateral movement, and the carriage's lateral movement and positioning control are performed. It is possible to obtain a uniform and stable spring constant of t'h over the entire transport section, to facilitate the lateral transport control of the carriage, and to improve the precision of carriage positioning.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the carriage traversal structure of a conventional serial printer; FIG. 2 is an explanatory diagram showing the relationship between the position of the carriage and the spring constant of the rope system in the conventional example of FIG. 1; 3 is a perspective view showing the carriage transverse feed structure of the serial printer according to the present invention, FIG. 4 0) is a system diagram of the spring constant in the embodiment of the present invention shown in FIG. is an explanatory diagram showing a modeled version of FIG. 3, and FIG. 5 is an explanatory diagram corresponding to FIG. 2 in one embodiment of the present invention. 1... Drive source [drive source] 2... Carriage 2
a, 2b... Guide shaft 3... Wire rope [rope system] 4... Guide pulley 5... Drum 6... Drive motor [drive source] 7... Carriage 7a,, 7b...
・Guide shafts 8a, 8b...wire ropes [ropes] 9a, 9b,
9c... Guide pulley 10... Drum 11a, l
lb...Wire rope attachment part Display patent application No. 147576 No. 2, Ql! 17) Name...A...2.2. No 1. Relationship with 211 cases of amendments, cross-transfer, structure 3, and persons making amendments Patent Applicant: 60゛ Representative: Tadahiro Sekimoto

Claims (1)

[Claims] A serial printer in which a carriage slidably held on a guide shaft and a power source are connected by a rope system, and the carriage is transversely conveyed and positioning is controlled via the rope system. In the carriage cross-travel structure, the above-mentioned rope system has two types of ropes that have the same spring constant or stirrup in the portion between the carriage and the drive source at the end position of the carriage cross-travel, and each have a different spring constant. A carriage cross-feed structure for a serial printer, characterized by comprising: