JPS6221807Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Technical field of the invention The invention relates to a gap adjustment mechanism for a cam and a cam follower that feed paper during paper change operations in thermal printers, etc., and in particular, a cam that facilitates fine adjustment of the gap. and the cam follower gap adjustment mechanism.

(b) Prior Art and Problems When the printing of the line being printed is completed in printers such as thermal printers and discharge breakdown printers, the printing paper must be rearranged. During this line feed operation, the printing head must be lifted off the platen surface using a cam attached to the line feed motor shaft and a cam follower that meshes with the cam to reduce the frictional load during paper feeding. The amount by which the printing head floats is determined by the amount of gap between the cam and the cam follower. A schematic configuration diagram of such a conventional cam and cam follower gap adjustment mechanism is shown in FIG. In the figure, 1 is a cam attached to a camshaft 2 connected to a drive source (not shown), 3 is a cam follower that meshes with the cam 1, and the cam follower 3 is composed of a roller support plate 31 and a roller 32 attached to the tip. Reference numeral 4 designates a connecting plate to which the cam follower 3 is attached and lifts the print head above the platen, and 5 designates a tightening screw for the cam follower 3.

When the printing of the line being printed is completed, the printing paper is fed in a predetermined direction in order to perform a line feed. It is necessary to float the head so that it does not come into contact with the printing paper. Therefore, a drive source (not shown) connected to the camshaft 2 is operated to rotate the cam 1.
The rotation of the cam follower 3 operates and lifts the print head above the platen surface via the connecting plate 4 connected to the print head. Therefore, it is necessary to reduce the frictional load during feeding of printing paper as much as possible to prevent damage to the printing paper. Therefore, the gap G between the cam 1 and the cam follower 3 is adjusted by loosening the tightening screw 5 and moving the roller support plate 31 in the direction of arrow A or B. However, gap G
It is very difficult to adjust the adjustment using the two tightening screws 5, resulting in a problem of poor work efficiency.

(c) Purpose of the invention In view of the above-mentioned conventional problems, the object of the present invention is to provide an adjustment mechanism with good workability that can easily adjust the gap between the cam and the cam follower.

(d) Structure of the invention In order to achieve the above-mentioned object, the present invention is a gap adjustment mechanism for a cam follower consisting of a cam, a roller that contacts the cam, and a support member that supports the roller. Screw the adjustable base end onto the connecting plate with the tightening screw, and screw the other end into the U
This is achieved by folding back into a shape of a letter, supporting the roller at the tip of the folded back, and attaching an adjustment screw to the opposing surface of the U-shaped fold to finely adjust the gap therebetween.

(e) Embodiments of the invention Preferred embodiments of the cam and cam follower gap adjustment mechanism according to the invention will be described in detail below with reference to the drawings.

FIG. 2 is a schematic configuration diagram for explaining one embodiment of the present invention. In Fig. 2, the gap adjustment mechanism for the cam and cam follower of this invention is the same as in Fig. 1, and includes a cam, a cam shaft, a cam follower, and a connecting plate that lifts the print head above the platen, but the cam follower has been improved. Has characteristics. Therefore, the parts other than the cam follower are given the same reference numerals as in FIG. 1, and the explanation of these parts will be omitted here. The cam follower 7 that characterizes the present invention includes a roller support plate 71 whose tip is folded back into a U-shape, a roller 72 attached to the folded end of the roller support plate 71, and an opposing surface of the folded end to which the roller 72 is attached. A screw hole 73 is bored on the side, and an adjustment screw 74 is attached to the screw hole 73.

A roller 72 is attached to the tip of a roller support plate 71 whose tip is formed into a U-shape, and a screw hole 73 is bored on the opposite side of the U-shaped folded end to which the roller 72 is attached. Adjustment screw 7 for fine adjustment in hole 73
4 is screwed in to define the gap to a predetermined dimension G against the U-shaped elasticity. By the way, when it is necessary to adjust the gap G between the cam 1 and the roller 72 of the cam follower 7, the adjustment screw 74 can be rotated left and right with a screwdriver or the like to maintain the optimum gap G. This gap adjustment can be done by roughly adjusting and fixing the roller support plate 71 to the connecting plate 4 with the tightening screw 5 in advance, and then gently rotating the adjusting screw 74, so that an extremely accurate gap G can be achieved.
Fine adjustments can be made easily.

In this embodiment, an example of the amount of floating of the printing head has been described in detail, but the present invention is not limited to the amount of floating of the printing head, but can also be applied to adjusting the contact gap of a micro switch or other contact points.

(f) Effect of the invention As is clear from the above explanation, the cam and cam follower gap adjustment mechanism according to the invention is superior to the conventional method of loosening the tightening screw and adjusting the roller gap via the roller support plate. Compared to this, the roller gap can be adjusted directly with the adjustment screw, which has the advantage of making the gap adjustment easier and more accurate.
It is extremely advantageous when applied to gap adjustment between various contact points.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram for explaining a conventional cam and cam follower gap adjustment mechanism, and FIG. 2 is a schematic configuration diagram for explaining an embodiment of the cam and cam follower gap adjustment mechanism according to the present invention. be. In the figure, 1 is a cam, 2 is a camshaft, 3 and 7 are cam followers, 4 is a connecting plate, 5 is a tightening screw,
31 and 71 are roller support plates, 32 and 72
73 represents a roller, 73 represents a screw hole, and 74 represents an adjustment screw.

Claims (1)

[Scope of utility model registration request] A cam follower gap adjustment mechanism consisting of a cam, a roller that contacts the cam, and a roller support member that supports the roller, the adjustable base end of the roller support member being screwed onto a connecting plate with a tightening screw. , folding the other end into a U-shape and supporting the roller on the folded tip;
A gap adjustment mechanism for a cam and a cam follower, characterized in that an adjustment screw for finely adjusting the gap therebetween is attached to the U-shaped folded opposing surface portion.