JPS60192670A - Printer - Google Patents

Abstract

PURPOSE:To provide a printer with low noise, by a construction wherein an elastic material such as a rubber is adhered to a platen-supporting bushing on the surface thereof brought into contact with a chassis part. CONSTITUTION:The elastic material 9 such as a rubber is adhered to the supporting bushing 10 for a platen 8 on the surface thereof brought into contact with the chassis part 11, leaving no gap between the bushing 10 and the chassis part 11, thereby functioning as a shock absorber on collision. Accordingly, even where a sharp force is exerted in the direction perpendicular to the center axis of the platen 8 due to discontinuous torque generated in a stepping motor 14 when a knob 13 is manually rotated in setting a paper, the bushing 10 and the chassis part 11 are prevented from colliding against each other by the elastic material 9 provided therebetween, so that the generation of noise is suppressed.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a printer that feeds a line of paper by rotating a platen with a step motor [Technical Background of the Invention and Problems thereof] The printer was as shown in FIGS. 1 and 2. That is, a platen 1 that rotates during line feeding, a chassis 3 that supports this grana/1 via a pusher L2, a gear 4 fixed to the shaft of the platen 1, and a platen 1 that rotates when setting paper in the printer. A knob 5 fixed to the shaft of the platen 1 for manually rotating the platen 1, a step motor 6 that rotates the platen 1 during line feeding and holds the platen 1 from rotating except during line feeding, and a step motor 6. The idler that transmits the torque of
It consisted of gear 7.

In a printer with this configuration, when setting paper, the knob 5
is manually rotated to wind up the paper onto the platen 1. At this time, the step motor 6 is operated as shown in FIG. Generates a holding torque that is discontinuous and whose direction changes. Considering the area before and after this discontinuity point, the holding torque is in the direction of returning manual rotation before it, but changes to the direction of advancing rotation after the discontinuity point, so 10 rotations of the platen are intermittent. Furthermore, due to the intermittent transmission torque acting between the gear 4 and the idler gear 7, the platen 1 has a steep rise in the direction perpendicular to its rotation axis in synchronization with the discontinuity point of the holding torque of the step motor 6. Power works.

The pusher S2 is fitted into the groove of the seven palms 3, but for the purpose of maintenance etc., the bushing 2 must be moved from the state shown in FIG. Rotate the platen 90 degrees around the axis of rotation and remove it from the chassis 3.The fit between the bushing 2 and the chassis 3 is loose, and there is a slight gap between them, so the holding torque of the step motor 6 may not be sufficient when setting the paper. When it becomes continuous, there is a point at which a sharp force acting in the direction perpendicular to the rotational axis of the platen 1 causes the platen S2 and the chassis 3 to collide and generate noise.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems and provides a low-noise printer.

[Summary of the invention]

The present invention is a printer in which an elastic material such as rubber is attached to the contact surface of the platen support pusher with the chassis to eliminate the gap between the pusher and the chassis and function as a buffer against collisions.

[Effect of invention]

This makes it possible to reduce the noise generated when the platen knob is manually rotated when setting paper.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 4 is a perspective view showing an embodiment of the printer according to the present invention. In the figure, 8 is a platen, 9 is an elastic rubber, 10 is a bushing, 11 is a chassis, 12 is a gear fixed to the shaft of the platen 8, 13 is a knob fixed to the shaft of the platen 8,
14 is a step motor.

15 is an idler gear. Figure 5 shows B - in Figure 4.
B' is a sectional view in the direction of vision loss.

With this configuration, when setting paper, when the knob 13 is manually rotated, even if a steep force is applied in a direction perpendicular to the center axis of the platen 8 due to discontinuous torque generated in the step motor 14, the bush 10 The bushing 10 and the chassis 1 are connected by the elastic rubber 9 located between the chassis 11.
1 collision is prevented, noise generation is reduced.

The elastic rubber 9 also has the effect of not transmitting vibrations generated in the platen of an impact type printer to the chassis.

Although the above embodiments are explained using elastic rubber, many other elastic bodies can be used.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional printer, Fig. 2 is a sectional view taken along the plane A-A' in Fig. 1 and viewed in the ancestral direction, and Fig. 3 is the static torque of the step motor. FIG. 4 is a perspective view showing an embodiment of the printer according to the present invention, and FIG. 5 is a cross-sectional view taken along the plane B-B' in FIG. 4 and viewed in the ancestral direction. In the diagram, 1... platen, 2... bush. 3... Chassis, 4... Gears. 5...knob, 6...step motor. 7... Idler gear, 8... Platen. 9... Elastic comb, 10... Bush. 11...Chassis, 12...Gear. 13...knob, 14...step motor. 15...Idler gear. Agent Patent attorney Kensuke Chika (and 1 other person)

Claims (1)

[Claims] A printer in which a grating is rotated by a step motor to feed the lath, and has nine bushings in which an elastic material such as rubber is pasted on the contact surface between the platen/support bushing and the shear 7.