JPH0339276A - Carriage transverse feed mechanism in serial printer - Google Patents

Abstract

PURPOSE:To prevent the vibration of a carrier by providing a carrier conducting printing while reciprocating along a printing surface and a balancer fixed on an endless belt so as to invariably move in a direction reverse to the moving direction of the carrier. CONSTITUTION:A carrier 1 is fixed on an endless belt 4. A balancer 8 having a weight equal to the sum of the mass of the carrier 1 and that of the loaded matter is fixed on the belt 4 on the opposite position to the carrier 1. Where the sum of the mass of the carrier 1 and that of the loaded matter is (m), a force F1 applied to the carrier 1 is F1 = ma. A reaction force F2 acting to a printer body at this time is F2 = -F1. This reaction force F2 causes the printer to vibrate in a longitudinal direction. In this invention, the balancer 8 invariably has an acceleration -a, which is equal to the speed of the carrier 1. A force F3 to be applied to the balancer 8 is F3 = -ma, and a reaction force F4 = -F3 is applied to the printer body. As a result, the forces F2 and F4 act to the printer body. The resultant force F2 + F4 = -ma + ma = 0 results in a balanced state wherein no force is apparently applied to the printer body.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a carrier cross-feeding mechanism for a serial printer, and particularly to a serial printer in which the carrier is moved by a belt and the belt can be prevented from rolling. Carrier transfer 11! Regarding the pattern.

[Prior Art] FIG. 2 shows a carrier cross-feeding mechanism of a conventional serial printer.

As shown in FIG. 2, in the carrier cross-feeding mechanism of the conventional serial printer, the carrier 11 is connected to the shaft 10.
The circular endless belt 15 is guided by the motor 1.
The drive pulley 13 rotates by 2, and the idler pulley 14 rotates freely. A portion of the carrier 11 is fixed to an annular endless belt 15, and a drive pulley 13 is rotated by a motor 12, and the endless belt 15 is reciprocated to perform lateral feeding.

[Problem M to be Solved by the Invention] In the conventional carrier traversing mechanism described above, the carrier repeats reciprocating motion, which causes shaking. Moreover, as the printing speed of recent serial printers has increased and the inertia of the carrier has increased, the vibration is becoming larger. Furthermore, there was also the problem that the stand on which the printer was placed would shake or the printer body would move from side to side.

[Means for Solving the Problems] An object of the present invention is to solve the above-mentioned problems of the prior art, to eliminate vibration of the carrier even when printing at high speed, and to prevent lateral movement of the printer. To provide a carrier cross-feeding mechanism for a serial printer that can eliminate shaking of a printer table.

The carrier cross-feeding structure of the serial printer of the present invention includes a drive booby rotated by a motor, an idler pulley that rotates freely, an annular endless belt wrapped around the drive pulley and the idler pulley, and fixed to the endless belt. The carrier is equipped with a print head that prints while reciprocating along the print surface, and a balancer that is fixed to an endless belt and always moves in the opposite direction to the carrier. It is characterized by being configured.

[Example] Next, a carrier cross-feeding mechanism of a serial printer according to the present invention will be described with reference to the drawings.

FIGS. 1(a), (b), and (c) are a front view, a plan view, and a cross-sectional view taken along line A-A of an embodiment of a carrier cross-feeding mechanism of a serial printer according to the present invention, respectively. It is.

The carrier 1 is equipped with a print head, a ribbon cassette feed R structure, etc., and is guided by a shaft 2 and a slide rail 3. The @end belt 4 is stretched between a drive pulley 6 driven by a motor 5 and an idler pulley 7 that rotates freely.

The carrier 1 is fixed to this endless belt 4. Furthermore, a balancer 8 having a weight equal to the sum of the masses of the carrier 1 and the loaded object is fixed on the endless belt 4 at a position symmetrical to the position where the carrier 1 is fixed.

When carrier 1 moves with acceleration a, if the sum of the masses of carrier 1 and the loaded object is m, then the force F applied to carrier 1 is
becomes F1=ma. At this time, a reaction force F2 acts on the printer body. This reaction force F2, which is F2''-F, is the cause of shaking the printer from side to side.

According to the present invention, a balancer 8 having a mass m is attached to the endless belt 4. The balancer 8 always has an acceleration of -a, its speed is equal to the speed of the carrier 1, the force F3 applied to the balancer 8 is F3--ma, and the reaction force F-F3 is applied to the printer body. In the end, the printer itself has F.
2 and F4 are acting, and this resultant force is F2+F4−-m
a0ma-=O, and the forces are balanced. Therefore, the printer body can be said to be in a state where no blade is apparently engaged, and no shaking occurs.

[Effects of the Invention] As explained above, the carrier cross-feeding 1411 of the serial printer of the present invention always moves the balancer, whose weight is equal to the sum of the masses of the carrier and the carrier-loaded object, in the opposite direction to the carrier with the same acceleration as the carrier. By moving the carrier, the vibrations that occur when the carrier accelerates are canceled out. In other words, the balancer generates vibrations that are 180 degrees out of phase with the vibrations of the carrier, canceling out the vibrations of the carrier.As a result, the printer as a whole eliminates vibrations when the carrier is moved, and therefore the balancer generates vibrations that are 180 degrees out of phase with the vibrations of the carrier. This has the effect of eliminating table shaking.

[Brief explanation of drawings]

FIGS. 1(a), (b), and (c) are a front view, a plan view, and a cross section taken along the line 1-A, respectively, of an embodiment of a carrier cross-feeding mechanism of a serial printer according to the present invention. It is a diagram. FIGS. 2(a), 2(b), and 2(c) are a front view, a plan view, and a sectional view taken along the line B--B, respectively, of a carrier cross-feeding a-ellipse of a conventional serial printer. 1...Carrier 2...Shaft 3...Slide rail 4...Endless belt 5...Motor 6...Drive pulley 7...Idler pulley 8...Balancer 9...Balancer guide

Claims (1)

[Scope of Claims] A drive pulley rotated by a motor, an idler pulley that rotates freely, an annular endless belt stretched around the drive pulley and the idler pulley, and a print head fixed to the endless belt. The carrier is configured to include: a carrier that performs printing while reciprocating along the printing surface; and a balancer that is fixed to the endless belt and always moves in the opposite direction to the carrier. A serial printer carrier cross-feeding mechanism characterized by: