JP2567596Y2 - Sheet positioning device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet positioning device for positioning a sheet such as a printing paper or an original when the sheet is set on a printing apparatus or the like.

[0002]

2. Description of the Related Art Generally, when a sheet such as a printing paper or an original is set on a printing apparatus or the like, the sheet must be positioned. That is, at least the left and right sides of the sheet are supported, and the sheet is supplied to a printing device or the like.

As a structure for positioning such a sheet-like material, a pair of left and right movable fences 21 is provided on a mounting table 20 on which the sheet-like material P is placed as shown in FIG. Is moved to support the left and right sides of the sheet material P.

However, the pair of fences 21 does not simply support the left and right sides of the sheet material P, but the center line C of the sheet material P, that is, the direction in which the sheet material P is taken into the printing apparatus. Center line C of sheet-like material P parallel to
The fence 21 is symmetrically moved so that the center line D of the mounting table 20 coincides with the center line D of the mounting table 20, and the position of the fence 21 supporting both the left and right sides of the sheet-like material P is changed as shown in FIG. It must be configured to be always equidistant (L = L ′) from the center line D.

Conventionally, an apparatus for positioning a sheet-like object on the mounting table 20 as described above has a pair of slits formed on a substrate 22 of the mounting table 20 as shown in FIGS.
Sliders are slidably attached to these slits, fences 21 are vertically provided on the respective sliders, racks 23 are provided on the back surfaces of the respective sliders, and pinions 24 are disposed between the respective racks 23 via pinions 24. It has a built-in structure.

[0006] Then, as shown in FIG.
Is slidably guided by a pair of guide pins 25 protruding from the rear surface of the substrate 22, and is pressed toward the rear surface of the substrate 22 by a coil spring 26 wound around the guide pins 25. That is, the elastic force of these springs 26 is used as the sliding resistance of the rack 23 so that the coil springs 26 press the racks 23 toward the substrate 22 and prevent the pair of fences 21 from being easily moved by external force due to vibration or the like. The pinion 24 is rotatably attached to a shaft 27 protruding from the rear surface of the substrate, and is secured by an E-ring 28. One end of the coil spring 26 is secured by a nut 29 at the tip of a guide pin 25. Have been.

[0007]

However, in the above-described conventional positioning device, since each of the racks 23 is pressed toward the board side, and the individual coil springs 26 are used at portions where sliding resistance is generated, each of the racks 23 is used. There is a problem in that the sliding resistance of the racks 23 differs depending on the mounting state of the coil spring 26, that is, the tightening condition of the nut 29, and the force required for moving the fence varies.

The coil spring 26 is attached to the guide pin 25 by using a nut 29. Since the coil spring 26 exerts an elastic force over the entire circumference, the rack 23 can be moved with respect to the guide pin 25 in any direction. Can be inclined, which causes a problem that the play of the rack 23 becomes large.

Furthermore, when adjusting the position of the fences 21, especially when the distance between the fences 21 is increased, the upper end of the fence 21 is often grasped and moved, and this operation causes the rack 23 to move together with the above-mentioned play. Is bent and the sliding resistance increases, causing a problem that these fences 21 do not move smoothly. In this state, if the fence 21 is operated carelessly and strongly, the fences 21 may be bent,
There is a problem that if the temperature is significant, it will be damaged.

Further, the conventional positioning mechanism has the disadvantage that the number of constituent parts is large and the number of steps in assembling is large.

In order to solve the above-mentioned problems, the present invention can move each rack provided on each fence without rattling, and can obtain a sufficient sliding resistance at the time of moving. It is an object of the present invention to provide a sheet-like object positioning device capable of reducing the number of parts and facilitating assembly.

[0012]

Next, means for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to the embodiment. The sheet positioning device 1 of the present invention includes a pinion 10 rotatably provided on a shaft 6 suspended from the back surface of a substrate 2 and a pair of guide pins 7 projecting from the back surface of the substrate. Guide slits 8b, 8b are formed on the plate surface so as to be slidably engaged with the rack 7. A pair of racks 8 are engaged with the pinion 10 to move in opposite directions along the back surface of the substrate. , 8 and a presser spring 11 for vertically pressing each rack against the back surface of the board, and a distance between a pair of fences 5 provided on each rack and perpendicular to the surface of the board. Is premised on the configuration of a sheet-like object positioning device that aligns the position of the sheet-like material side by making it adjustable according to the size of the sheet-like material placed between the pair of fences. Thus, in the present invention, the holding spring 11
Is made of a leaf spring, the center of which is attached to the shaft 6, and both ends are curved and formed in a substantially C-shape in the symmetrical inward direction and in the direction of the rear surface of the substrate, and are formed on the plate surface on the tip end side thereof. The guide pins 7, 7 are inserted into and engaged with the engagement holes 11b, 11b, and the plate surface on the tip end side is elastically pressed against the plate surface on which the guide slits of the rack are formed vertically. The rack is pressed against the back surface of the substrate.

The shaft 6 is inserted into a mounting hole 11a formed at the center of the pressing spring 11, and a retaining piece integrally projecting from the inner periphery of the mounting hole 11a is attached to the tip of the shaft 6. It may be configured to be engaged with and attached to the step 6a integrally formed on the outer periphery.

[0014]

A pair of racks 8 meshing with the pinion 10 simultaneously slide in opposite directions opposite to each other via a pinion 10 which is rotatable about a shaft 6 vertically provided on the surface of the substrate 2. A pair of fences 5, 5 provided on the racks 8, 8 and perpendicular to the surface of the substrate 2,
So that they are always at the same distance from each other. That is, both fences 5 and 5 move so as to be equidistant from the center line of the substrate 2. The racks 8, 8 are provided with an appropriate sliding resistance by a holding spring 11 whose center is attached to the shaft 6, so that the fences 5, 5 connected to the racks 8, 8 can be easily mounted. Do not move. As a result, the sheet-like material P such as printing paper placed on the substrate 2 is always supported by the fences 5 and 5 on the left and right sides, and the center line thereof is always aligned with the center of the substrate 2. Then, a constant supply state is provided to the printing apparatus and the like.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sheet positioning device 1 according to the present embodiment comprises:
As described in the related art, for example, it is provided on a printing apparatus or the like, and is provided on a mounting table on which printing paper, a document, or the like is mounted.

First, a pair of slits 3, 3 are formed in the substrate 2 of the mounting table as shown in FIG. These slits 3, 3 are arranged at predetermined intervals so that the center line in the longitudinal direction is straight, and each slit 3, 3 has:
Substantially block-shaped sliders 4 and 4 are slidably mounted respectively. Fences 5 and 5 are provided vertically on the upper surfaces of the sliders 4 and 4, that is, on the surface side of the substrate 2. Each of the fences 5, 5 is formed as a pair and is formed in a rectangular plate shape, and the base ends on the lower edge sides are bent inwardly to form attachment portions 5a. Fixed.

A shaft 6 and a pair of guide pins 7 are located on the back surface of the substrate 2 between the slits 3.
7 project in parallel. The shaft 6 is at a position on the longitudinal center line of each of the slits 3, 3, and is positioned at a center of each of the slits 3, 3 at the center of the substrate 2 so as to be cantilevered with respect to the back surface of the substrate 2. The guide pins 7 are disposed on both sides of the shaft 6 so as to be equidistant from the shaft 6.

Next, on the back surface of each of the sliders 4 and 4, that is, on the back surface side of the substrate 2, a pair of racks 8 and 8 each having a tooth row 8 c on one side are provided. The rack 8 is formed in a substantially plate shape, and is provided at its base end with a mounting piece 8a extending in a direction perpendicular to the direction of the teeth and fixed to the back surface of the slider 4. I have. The rack 8 has a guide slit 8b formed along the tooth row 8c and parallel to the tooth row 8c so as to be along the moving direction of the rack 8.

The racks 8 are mounted on the sliders 4 by engaging the guide slits 8b with the guide pins 7 so that the tooth rows 8c face each other, and guide the movement of the racks 8 when moving. It has become. The guide pins 7 engaging with the guide slits 8b of the respective racks 8 are provided with washers 9 respectively located on the front and rear surfaces of the rack 8 so as to sandwich the rack 8 to facilitate sliding.

The shaft 6 protruding from the back surface of the substrate 2
, A pinion 10 is rotatably mounted and meshes with the teeth 8c of each of the racks 8.

Next, as shown in FIG. 2, the pressing spring 11 is attached to the shaft 6 described above. The pressing spring 11 has a shape in which both ends of a plate-like member having elasticity are curved and each end is formed in a substantially C-shape, and a substantially H-shaped mounting is provided at the center of the plate surface. A hole 11a is bored, and a retaining piece is integrally formed on the inner periphery of the mounting hole 11a, and an engaging hole 11b is formed at each of both ends.

The pressing spring 11 engages the engaging holes 11 b of the curved portions at both ends with the guide pins 7, and pushes the mounting hole 11 a at the center into the tip of the shaft 6. And the above-mentioned removed piece on the inner periphery of the mounting hole 11a is attached to the shaft 6
Is fixed by being fitted into the step 6a formed at the tip of the. When attaching the holding spring 11, since both ends of the holding spring 11 are curved, elastic force is generated at both ends with respect to the center, and the center is opposed to the elastic force of both ends. The part is fixed to the shaft 6. The elastic force generated at both ends is urged to the racks 8 via the washers 9, and the racks 8 are constantly pressed against the back surface of the substrate 2 by the holding springs 11. State.

Accordingly, in the sheet positioning device 1 configured as described above, the sheet P such as printing paper is placed on the mounting table, and the positions of the left and right sides of the sheet P are aligned and supported. For this purpose, at least one of the fences 5 is moved so that the center line C of the sheet material P is shifted to the center line D of the mounting table.
To match. (See FIG. 3) During the movement of the fence 5, the racks 8, 8 fixed to the base ends of the fences 5, 5 slide by the same distance in opposite directions opposite to each other via the pinion 10. Therefore, both fences 5, 5 move so that they are always equidistant from the pinion 10. That is, both fences 5 and 5 move so as to be equidistant from the center line D of the mounting table. In addition, even if only one fence 5 is moved, the other fence 5 moves via the pinion 10, and the distance of each fence 5, 5 from the pinion 10 becomes equal.

Thus, the sheet material P such as printing paper placed on the mounting table is always placed with its center line C coinciding with the center line D of the mounting table. The supply state is constant.

Further, both racks 8 are held by holding springs 11.
Has an appropriate sliding resistance, and the fences 5, 5 do not easily move in a state where the sheet-like material P is supported by the fences 5, 5.

Further, the sheet positioning device 1
Then, instead of the E-ring which has been conventionally used as a retaining member for the pinion 10, the center portion of the pressing spring 11 is restricted in movement of the pinion 10 in the axial direction, and the retaining member 11 retains the retaining member 11. The structure also serves as a stopper for the pair of racks 8, 8, and the pressing resistance 11 is applied to the racks 8, 8, so that many parts are not required unlike the conventional case. ,
The holding spring 11 alone can prevent the pair of racks 8 and 8 and the pinion 10 from coming off, prevent backlash, provide sliding resistance to the racks 8 and 8, and can be easily attached, greatly reducing the number of assembly steps. Can be reduced.

Further, since the pressing spring 11 is formed of one member and the mounting position of the shaft 6 is uniquely determined by the fitting of the mounting hole 11a and the stepped portion 6a, any adjustment is made. A uniform pressing force can be applied to each of the racks 8, 8 without generating a stable sliding resistance, and the racks 8, 8 have an optimum sliding resistance.
Can be held down.

Further, since the pressing spring 11 is formed of a plate-like spring, the bending direction due to elasticity is limited. That is, in the present invention, the bending in the direction parallel to the moving direction of the racks 8, 8 does not occur. The racks 8, 8 bend only in the direction perpendicular to the direction of movement, and the elastic force is generated, so that the play of the racks 8, 8 is reduced, and the racks 8, 8 are bent or distorted when the fences 5, 5 are moved. Generation is suppressed.

[0029]

As described above, according to the sheet-like object positioning apparatus of the present invention, each of the racks 8, 8 is controlled by one presser spring 11 whose mounting position is uniquely determined.
Can be uniformly pressed, and a stable sliding resistance can be given to each of the racks 8, 8, and play of the racks 8, 8 at the time of movement can be suppressed. The effect that the fences 5, 5 can be moved lightly and smoothly can be obtained. The pressing spring 11 is formed of a leaf spring whose both ends are curved in a substantially C-shape inward in the symmetrical direction and in the direction of the back surface of the substrate. The rack is pressed against the back surface of the substrate so as to be vertically resilient, and the plate surfaces at both ends of the holding spring 11 are regulated by the engaging holes 11b, 11b and the guide pins 7, 7. Therefore, since the racks 8, 8 and the pressing spring 11 always press accurately at an intermediate position along the guide slits 8b, 8b of the both racks 8, 8, the stable elastic pressure close to the surface contact between the opposing plate surfaces is obtained. Even if external force is applied to the fence 5
It is possible to perform a stable and smooth operation of the fence 5 without causing the racks 8 integral with the rack 8 to move blind.
In addition, since the holding spring 11 is curved and formed in a substantially C-shape from the mounting position at the center to the free end thereof and is sufficiently long, the holding spring 11 and the rack 8 have processing errors and assembly errors. Also, the force with which the holding spring 11 presses the rack 8 hardly changes and does not affect the sliding resistance of the rack 8, so that the sliding of the rack can be made smooth and the fine adjustment movement of the fence 5 is performed. It will be easier.

The mounting hole 1 formed in the holding spring 11
The retaining piece 11 is integrally mounted on the inner periphery of 1a, and the retaining spring 11 is attached so that the retaining piece is engaged with the step 6a on the outer periphery of the tip of the shaft 6 suspended from the surface of the substrate. if,
The mounting position of the presser spring is uniquely determined, and there is no need to adjust the spring pressure for each rack. In addition, this presser spring also serves as a pinion retainer, reducing the number of parts and greatly reducing the number of assembly steps. It has the effect of being able to reduce.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a sheet positioning device according to the present invention;

FIG. 2 is a side sectional view of the positioning device according to the embodiment.

FIG. 3 is a perspective view of the positioning device in a state where a sheet-like material is placed.

FIG. 4 is an explanatory view of a positioning device according to the related art.

FIG. 5 is a perspective view of a positioning device according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Positioning device 2 ... Substrate 3 ... Slit 5 ... Fence 5a ... Base end (attachment part) 6 ... Shaft 7 ... Guide pin 8 ... Rack 10 ... Pinion 11 ... Holding spring 11b ... Engagement hole P ... Sheet-like material

Claims (2)

(57) [Scope of request for utility model registration] 1. A shaft (6) suspended from a back surface of a substrate (2).
A pinion (10) rotatably provided on the substrate and the substrate
Slides on a pair of guide pins (7, 7) protruding from the back of
Guide slits (8b, 8b) that freely engage on the plate surface
A pair of racks (8, 8) formed and engaged with and interlocked with the pinion (10) and moved in opposite directions along the back surface of the substrate, and pressing the racks against the back surface of the substrate; ; and a pressure spring (11) for the distance between fence (5,5) one <br/> pair that Do perpendicular to the surface of the substrate provided in each rack, the pair of fences
In the sheet positioning device for adjusting the position of the side of the sheet by adjusting the size of the sheet according to the size of the sheet placed therebetween, the holding spring (11) is a leaf spring; A central part is attached to the shaft (6), and both ends are directed inward and symmetrically.
Is formed into a substantially C-shape in the direction of the back of the substrate,
Engagement holes (11b, 11b) formed in the plate surface on the end side
The guide pins (7, 7) are inserted and engaged,
A guide slit of the rack is formed on the plate surface on the tip end side.
And press the rack against the back surface of the substrate.
Positioning of a sheet, characterized in that to press the. 2. The pressing spring (11) is formed at a central portion thereof.
The shaft (6) is inserted into the mounting hole (11a).
And projecting integrally with the inner periphery of the mounting hole (11a).
The removed piece is integrally formed on the outer periphery of the tip of the shaft (6).
2. A sheet positioning device according to claim 1, wherein said positioning device is engaged with said stepped portion .