JPS6132993B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coupling device between a carrier and a drive belt for moving printheads in, for example, a serial printer. A conventional coupling device between a carrier and a drive belt is shown in FIGS. 1 and 2. To explain the conventional coupling device with reference to the same figure, a carrier 5 that moves back and forth guided by guide bars 2 and 3 arranged parallel to the direction perpendicular to the traveling direction of the recording medium 1 carries a print head 4. are doing. A drive belt 6 that drives the carrier 5 is connected to the carrier 5 via a belt holder 7.
The belt 6 is connected and fixed to a belt holder 7 by a holder 8 having an opening 9 that engages with the teeth of the belt 6 and a set screw 10. 11 is a driver insertion hole provided in the carrier 5.

The conventional device described above has the following drawbacks.

1. The belt 6 is attached and detached by inserting a driver through the hole 11 of the carrier 5 and attaching and detaching the set screw 10 and the holder 8, so the set screw 10 and the holder 8 fall during attachment and detachment.

2. It is difficult to position the holder 8 at a predetermined position below the belt 6 and tighten the set screw 10 to the predetermined position while maintaining this position.

An object of the present invention is to eliminate the above-mentioned drawbacks of the conventional device and to simplify the attachment and detachment of the carrier and the drive belt.

In order to achieve the above object, the present invention moves the belt holder forward and backward using an operating member that can be operated outside the carrier, and connects the belt and the carrier by moving the belt holder either forward or backward. The present invention will be described below with reference to embodiments.

In FIGS. 3 and 4, a carrier 5 on which a print head 4 is mounted via bearings 13, 13 is attached to a belt assembly 14 on a guider 12 disposed perpendicularly to the traveling direction of the recording medium 1. Therefore, it is driven back and forth to record on the printing surface 1. The belt assembly 14 consists of a belt 6 and a holder 15.
5 is engaged with the teeth 23 of the belt 6 without slipping by the opening 9 meshing with the teeth 23 of the belt 6. The opening 16 of the holder 15 is connected to the belt engaging portion 27 of the carrier 5.
The belt 6 and the carrier 5 are engaged with each other and are securely engaged with each other without slipping by a belt holder 18 that is movable in the longitudinal direction and is pressed against the carrier 5 by a belt holder 18 which will be described later and can be moved back and forth in the longitudinal direction.

In addition to the mountain portion 17, the carrier 5 is provided with a holder guide portion 19 formed of a slope. The belt holder 18 is made of, for example, a sheet metal, and a belt pressing portion 20 and a pressing portion guide member 21 are provided at its tip (right end in FIG. 3) facing each other with the belt 6 in between. The belt pressing section 20 is located on the lower surface of the holder 15 , and the pressing section guide member 21 is located on the upper surface of the holder guiding section 19 . The contact surface of the guide member 21 is formed into a slope so as to match the shape (slope) of the guide portion 19. Figure 3 shows the guide member 21
runs on the guide portion 19, and the belt pressing portion 20 presses the belt 6 against the carrier 5 via the holder 15. That is, the lower opening 9 of the holder 15 tightly engages the teeth 23 of the belt 6, and the upper opening 16 of the holder 15 tightly engages the belt engaging part 27 of the carrier 5.
The belt 6 is tightly engaged with the peak 17 of the carrier 5, and the belt 6 is connected and fixed to the carrier 5 without play.

The rear end of the belt holder 18 protrudes to the outside of the carrier 5, and a notch 25 thereof is fitted into a shaft portion of a holder operating member 24 that protrudes to the outside of the carrier 5. The screw shaft 29 of the operating member 24 is loosely fitted into the hole 28 of the carrier 5, and the screw shaft 29 is screwed into a nut 31 inserted into the recess 30. A spring 26 is interposed between the rear end of the belt holder 18 and the operating member 24 to push the holder belt 18 to the right in FIG.

In the above configuration, when the operating member 24 is rotated in one direction, the operating member 24 retreats in the direction of arrow A by the action of the screw. As a result, the spring 26 is expanded from its compressed state, and the force pushing the belt holder 18 to the right in FIG. 3 is eliminated. When the operating member 24 is further retreated from the position where the pressing force of the spring 26 against the belt holder 18 is released, the belt holder 18 can be retreated by hand. The pressing part guide member 21 is separated from the holder guide part 19. As a result, the pressing force exerted by the belt pressing section 20 on the belt 6 is released, the connection between the belt 6 and the carrier 5 is substantially released, and the belt 6 can be removed from the carrier 5.

When connecting the belt 6 to the carrier 5, the operating member 24 is rotated in the opposite direction to the above while the upper opening 16 of the holder 15 is engaged with the peak 17 of the carrier 5, and the operating member 24 is rotated in the direction opposite to arrow A. advance in the direction. As a result, the spring 26 is compressed and the belt holder 18 is moved to the right in FIG. 3 by the spring 26. At this time, the pressing portion guide member 21 rides on the holder guide portion 19 and comes into sliding contact with the holder guide portion 19 . As a result, the belt holder 18 is displaced upward, and the belt pressing section 20 presses the belt 6 against the carrier 5 via the holder 15, so that the belt 6 is connected and fixed to the carrier 5.

FIGS. 5 and 6 show a second embodiment. In this example, the holder 15 in the first example is removed, and the belt 6 is directly pressed against the carrier 5 by the belt holder 18. In the figure, the carrier 5 is formed with similar teeth 32 that mesh with the teeth 23 of the belt 6. The holder guide portion 19 of the carrier 5 has a slope in the opposite direction to that in the first embodiment, and the pressing portion guide member 21 also has a slope in the opposite direction. Further, the pressing portion guide member 21 is arranged on an extension of the belt pressing portion 20. Further, the operating member 24 has its screw shaft 29
is screwed into a screw hole 32 provided in the carrier 5.

In this example, the direction in which the belt 6 is pressed by the belt holder 18 is opposite to that in the first example;
This has the same effect as the first embodiment.

According to the present invention, the belt holder can be connected and disconnected from the carrier by operating the belt holder using the holder operating member protruding from the outside of the carrier, so that the operation can be performed simply and easily. There is.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional carrier-belt coupling device, and FIG. 2 is an enlarged exploded perspective view of the main parts. FIG. 3 is a longitudinal sectional view showing a first embodiment of a carrier-belt coupling device according to the present invention, and FIG. 4 is an enlarged perspective view of the belt and holder in the same embodiment. FIG. 5 shows the second embodiment of the present invention.
FIG. 6 is a longitudinal cross-sectional view showing an embodiment of the present invention, and FIG. 6 is an enlarged perspective view of main parts in the embodiment. 1 is a recording surface, 4 is a print head, 5 is a carrier, 6 is a drive belt, 18 is a belt holder, 1
9 is a holder guide part, 20 is a belt pressing part, 24 is a pressing part guide member, and 24 is a holder operating member.

Claims (1)

[Scope of Claims] 1. A printer in which a carrier carrying a print head is moved back and forth along a printing position by a drive belt, and prints during this movement, comprising: a holder guide portion and a belt engaging portion formed on the carrier; and a belt pressing part that presses the belt against the belt engaging part, and a pressing member that is slidably provided along the holder guide part, and that the sliding contact displaces the belt pressing part in the direction of pressing the belt engaging part. a belt holder having a section guide member at one end and whose other end protrudes outside the carrier; a holder operating member passing through the other end of the belt holder and attached to the carrier so as to be movable forward and backward; A carrier and a drive belt, characterized in that a spring is provided between the outer end of the member and the belt holder and presses the belt holder in a direction in which the belt pressing part presses the belt engaging part. Coupling device. 2. A device for connecting a printer carrier and a drive belt according to claim 1, wherein at least one of the holder guide portion of the carrier and the pressing portion guide member of the belt holder is sloped.