JPH0620767Y2 - Guide interlocking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial field of application The present invention is, in a facsimile, a copying machine, etc., set a plurality of originals and feed them one by one, or set a plurality of recording papers and set one by one. More specifically, the present invention relates to a recording paper table for feeding (hereinafter referred to as a paper supply table), and more particularly, to a guide interlocking device that moves a pair of guides for guiding both side edges of a sheet such as an original or a recording paper symmetrically to match the sheet width.

2. Description of the Related Art Conventionally, as shown in FIG. 4, a pair of guides 3 that are symmetrically movable in the left and right directions are provided on a support base 2 on which a sheet 1 such as a document is placed, and the guides 3 guide both side edges of the sheet 1. The paper feed table configured as above is widely used. As a mechanism for moving the pair of guides 3 symmetrically, as shown in FIG. 5, rack members 4 and 4 having teeth 4a on the surfaces facing each other are attached to the guides 3 and 3, respectively. ，
The teeth 4a, 4a of 4 are meshed with a common pinion gear 6 rotatably held by a central support shaft 5. Here, the teeth 4a formed on the rack member 4 are the same as those of the normal rack member 4. It was formed over the entire thickness, in other words, the tooth groove 4b penetrated the rack member 4 vertically.

However, according to this configuration, the pair of guides 3 and 3 are
There is a problem that the assembling work for mounting the guides at symmetrical positions with respect to the center is troublesome, and the mounting positions of the pair of guides 3, 3 are sometimes misaligned.

The above problem occurs for the following reasons. That is, in order to assemble the guides, first, the guides 3 and 3 and the rack members 4 and 4 connected to the guides 3 are placed in the grooves formed on the support base 2, and the guides 3 and 3 are provided with end portions of the moving stroke ( Work in which the pinion gear 6 is inserted into the support shaft 5 from above while being positioned at the farthest position or the closest position), and at the same time, the teeth of the pinion gear 6 are passed through the tooth grooves 4b of the rack members 4, 4. However, at this time, it is necessary to hold the rack members 4 and 4 so that they do not move, and the assembling work is troublesome. If the rack members 4 and 4 are not pressed by hand when the pinion gear 6 is attached, the rack member 4 may move for some reason. Even in this state, the pinion gear 6 is inserted from above. Since it is possible to engage with the teeth of both rack members 4 and 4, the rack member 4 engages the pinion gear 6 at a position where the teeth of the rack member 4 are offset by one or two, and the left and right guides 3 and 3 are engaged. Sometimes it was asymmetrical to the center.

The present invention has been made in view of such conventional problems,
It is an object of the present invention to provide a guide interlocking device that can surely assemble a pair of guides at symmetrical positions.

Means for Solving the Problems In order to solve the above problems, the present invention provides a pair of rack members having teeth that mesh with a common pinion gear, except for a small number of tooth grooves at symmetrical positions. Although the tooth space has a shape closed on one side thereof, the small number of tooth spaces are configured to open on one side.

The present invention has the above-mentioned configuration, and when the pinion gear is moved in the tooth groove direction from the side where the tooth groove is closed to engage with the rack member, a small number of one side formed at symmetrical positions are formed. The pinion gear cannot be meshed with anything other than the tooth groove that is opened. Therefore, when the pinion gear can be meshed with the teeth of the rack member, the pinion gears are always meshed with the tooth grooves that are symmetrical to each other, and the pair of rack members are set at the correct positions. Therefore, each rack member can be accurately positioned and attached by simply engaging the pinion gear with each rack member.

Embodiments Embodiments of the present invention shown in the drawings will be described below.

FIG. 1 is an exploded perspective view of a paper feed table equipped with a guide interlocking device according to an embodiment of the present invention, and FIG. 2 is a plan view of the guide interlocking device of the present invention. In FIG. 1 and FIG.
Reference numeral 8 is a support table on which a sheet (not shown) such as a document is placed, 9 is a pair of guides, 10 is a rack member attached to each guide 9, 11 is a pinion gear, and 12 is a cover. The support base 8 has a groove 8 on its upper surface for movably mounting the guide 9.
a, a groove 8b for movably holding the rack members 10, 10 in parallel with each other, and a support shaft 8c provided at the center of the pair of grooves 8b, 8b. The support shaft 8 is provided with a pinion gear. 11 is held rotatably. Each rack member 10,1
0 is a tooth that meshes with the pinion gear 11 on the surfaces facing each other
It is provided with 0a and a tooth groove 10b. This tooth groove 10a and tooth groove 10b
Is formed on the lower surface side of each rack member 10, 10 except for the vicinity of the end portions. Therefore, as shown in an enlarged view in FIG. 3, the upper ends of the tooth spaces 10b are the non-gear portions 10c. It has a closed shape. However, the tooth grooves 10d formed at symmetrical positions at the ends of the rack members 10, 10 are formed so as to open on the upper surface of the rack members. here,
Tooth groove 10b formed so as to open on the upper surface of the rack member 10
The formation position and the number of are the minimum numbers at which the left and right rack members 10 and 10 are symmetrical to each other and the pinion gear 11 can be inserted from above and engaged with each other.

In assembling the rack interlocking device having the above-mentioned configuration, the pair of guides 9 and 9 and the rack members 10 and 10 fixed to the guides 9 and 9 are inserted into the grooves 8a and 8a on the support base 8, and the guides 9 and 9 are laterally moved. When opened, the ends of the rack members 10, 10 are opposed to each other as shown in FIG. Next, from the top, the pinion gear 11 whose teeth are tooth grooves 10d, 10d of the rack members 10, 10
It is pushed in while being inserted into and is fitted to the support shaft 8c. Thus, the pinion gear 11 is set at a position where it meshes with the teeth of the rack members 10, 10. At this time, since the upper surface of the other tooth groove 10b is closed by the non-gear portion 10c as described above, when the pinion gear 11 is pushed in, the tooth groove 10b cannot be pushed in, and therefore the pinion gear 11 is not pushed. Must be meshed with the tooth spaces 10d, 10d which are symmetrical to each other, and the pair of rack members 10, 10 and the guides 9, 9 fixed to the rack members 10, 10 are set at mutually symmetrical positions. In other words, by simply engaging the pinion gear and each rack member, each rack member can be accurately positioned and attached.

In the above embodiment, the tooth groove 10d opening on the upper surface of the rack member is formed at the end of each rack member, but this position can be changed as appropriate, and it is optional as long as it is a symmetrical position of the pair of rack members. Is. Further, in the above-described embodiment, the case where the tooth groove 10b whose one side is closed by the non-gear portion 10c is formed on the lower surface side of the rack member 10 is shown, but instead, the tooth groove is formed on the upper surface side of the rack member, The non-gear portion may be on the lower surface side.
In that case, the support shaft 8c of the support plate 8 should be moved first by the pinion gear.
After that, the rack member may be inserted into the groove 8b from above, and simultaneously engaged with the pinion gear.

EFFECTS OF THE INVENTION As is clear from the above description, according to the present invention, in a pair of rack members that mesh with a common pinion gear, other tooth grooves are provided on one side of the rack member, except for a small number of tooth grooves that are symmetrical to each other. Since the teeth of the closed shape are formed, when the pinion gear and each rack member are relatively moved in the tooth groove direction and meshed with each other, the teeth of the pinion gear are simply inserted into the insertable rack member. By simply inserting the rack member into the tooth groove, the pair of rack members can be accurately positioned and attached at predetermined symmetrical positions, which facilitates the assembling work and has the effect that the rack member can always be assembled at the correct position. ing.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a paper feed table having a guide interlocking device according to an embodiment of the present invention, FIG. 2 is a plan view of the guide interlocking device of the present invention, and FIG. 3 is one of rack members. FIG. 4 is a perspective view showing an enlarged part, FIG. 4 is a perspective view showing a general paper feed tray, and FIG. 5 is a plan view showing a conventional guide interlocking device. 8 ... Support base, 8a ... Groove, 8b ... Groove, 8c ... Spindle, 9 ... Guide, 10 ... Rack member, 10a ... Tooth, 10b
...... Tooth groove, 10c …… Non-gear part, 10d …… Tooth groove, 11 …… Pinion gear.

Claims (1)

[Scope of utility model registration request] 1. A pair of rack members, which are movably arranged in parallel to each other and have teeth on opposite surfaces, each of which is attached to a separate guide, and the pair of rack members. Having a common pinion gear that meshes with each other, the tooth groove formed in the pair of rack members has a shape in which other tooth grooves close one side thereof, except for a small number of tooth grooves at symmetrical positions. The guide interlocking device, wherein the small number of tooth spaces have a shape in which the one side is opened.