JPH03110572A - Driving force transfer structure - Google Patents

Abstract

PURPOSE:To securely transfer and stop both a forward and a backward rotary driving force from a driving source, arranged in an upper or lower unit, to driven parts in the upper and lower units without any delay by aligning the axis of rotation of a rotary member with the axes of opening movement of the upper and lower units. CONSTITUTION:This driving force transmission structure employs what is called a clamshell type structure wherein the upper unit 12 is coupled with the lower unit 14 pivotally so that the upper unit can be opened and moved vertically with a shaft 16, and the upper unit 12 can be opened and moved as shown by an arrow A. Here, the axis of rotation of timing pulleys 32 and 34 as rotary members are aligned with the shaft 16 coupling the upper unit 12 and lower unit 14, so a motor 18 can be coupled with rollers 22 and 23 in the upper and lower units through timing pulleys 32 and 34 in invariably constant position relation. Consequently, both the forward and backward rotary driving forces can securely be transferred and the rollers 22 and 36 can be rotated and stopped under the control of the motor 18 to enable the transfer and stopping without any delay.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a driving force transmission structure, and particularly to a driving force transmission structure used in a device in which an upper unit is pivotally connected to a lower unit so as to be able to open up and down. Regarding structure.

[Prior Art] A so-called Taram shell type device in which an upper unit is pivotally connected to a lower unit so as to be vertically open and movable is known in various fields.

For example, in an image recording device that performs image recording processing by conveying image recording material using nipping conveyance rollers, an upper unit and a lower unit can be separated and opened using the moving path of the image recording material as a boundary. This makes it easy to handle paper jams (so-called jam clearance) and maintain them.

Incidentally, in this kind of Talam shell type image recording apparatus, nipping conveyance rollers for conveying the image recording material are arranged in both the upper unit and the lower unit, and the rollers are used to convey the image recording material before and after exposure. It has become. Each of these conveyance rollers is connected to a motor and rotated. In this case, a single motor disposed in one unit (for example, the lower unit) rotates the nipping conveyance rollers of both units, so a means for transmitting the driving force is required.

For this reason, conventionally, as shown in FIG.
A drive gear 5 directly connected to the rotating shaft of a motor 52 in the
4 and a driven gear 58 connected to the nipping conveyance roller of the upper unit 56.

This intermediate gear 60 is attached to an arm 62 that has the rotating shaft of the drive gear 54 as a fulcrum, and is always connected to the drive gear 54.
are meshed with each other. A spring 64 is connected to the arm 62 and biases the intermediate gear 60 in a direction toward the driven gear 58. As a result, the intermediate gear 60 is kept flat by a pitch booster (not shown), and is moved toward the driven gear 58. They mesh together.

When the motor 52 is driven, this rotational driving force (rotational force in the direction of arrow B) is transmitted to the driven part in the lower unit 50 by the driving gear 54, and is also transmitted to the driven gear 58 via the intermediate gear 60. The signal is transmitted to the driven portion within the upper unit 56.

However, although such a driving force transmission structure has advantages such as no restrictions on the arrangement position of each gear or arm 62, it can transmit the rotational force of the motor 52 (drive gear 54) in the direction of arrow B, but The rotation in the direction is performed by the spring 64.
The arm 62 rotates against the urging force of the intermediate gear 60 and the driven gear 58, which disengages the intermediate gear 60 and the driven gear 58, resulting in a disadvantage that rotational driving force cannot be transmitted.

The driven gear 58 also rotates due to the inertial force of the driven part in the connected upper unit 56, but when the motor 52 is stopped to stop transmitting the driving force, the rotational force due to this inertia is The driven gear 58 and the intermediate gear 60 are disengaged from each other, and as a result, even though the motor 52 is stopped, the driven gear 58 continues to rotate and the driven part (driven gear 58 ) cannot be stopped instantaneously (overruns) and has poor braking performance. Therefore, it cannot be used when precise conveyance control is required.

On the other hand, there is also a driving force transmission structure using two intermediate gears 66 and 68, as shown in FIG. 3, in order to rotate the driven gear 58 in forward and reverse directions. In this driving force transmission structure, the intermediate gears 66, 68 are attached to a bifurcated arm 70 that has the rotating shaft of the driving gear 54 as a fulcrum, and are always meshed with the driving gear 54. A spring 64 is connected to one end of the bifurcated arm 70 and biases one intermediate gear 66 in a direction toward the driven gear 58, so that the intermediate gear 66 meshes with the driven gear 58. A solenoid 72 is connected to the other end of the bifurcated arm 70,
By operating against the biasing force of the spring 64,
One intermediate gear 66 is separated from the driven gear 58, and the other intermediate gear 68 meshes with the driven gear 58.

In this driving force transmission structure, the intermediate gear 66 is connected to the driven gear 58.
A state in which the intermediate gear 68 meshes with the driven gear 58 and a state in which the intermediate gear 68 meshes with the driven gear 58 are selected by operating the solenoid 72. As a result, rotation of the motor 52 in one direction causes the driven gear 5 to
8 can be rotated in both forward and reverse directions.

However, in this case, the pair of intermediate gears 66,68
Since the solenoid 72 and the solenoid 72 are essential, the number of parts increases. Also in this case, as described above, due to the rotation of the driven gear 58 due to inertia, even if the motor 52 is stopped, the driven part (driven gear 58) in the upper unit 56 cannot be stopped instantaneously ( (poor braking performance) and cannot be used in cases where precise conveyance control is required.

[Problems to be Solved by the Invention] The present invention takes the above facts into consideration, and the present invention transfers the rotational driving force in both the forward and reverse directions of the drive source disposed in either the upper unit or the lower unit to the rotational driving force in the upper unit or the lower unit. The object is to obtain a driving force transmission structure that can reliably transmit and stop driving force to a driven part without delay.

[Means for Solving the Problems] The driving force transmission structure according to the present invention is used in a device in which an upper unit is pivotally connected to a lower unit so as to be vertically open and movable, and includes For transmitting the rotational driving force of a driving source disposed in either one of the units to the driven parts in the upper unit and the lower unit by a rotating member connected to the driving source via a connecting member. The driving force transmission structure is characterized in that the rotational axis of the rotating member connected to the drive source is arranged to coincide with the axis of opening movement of the upper unit and the lower unit.

[Operation] In the driving force transmission structure configured as described above, the rotational axis of the rotating member is arranged to coincide with the axis of opening movement of the upper unit and the lower unit, so the upper unit is moved upwardly and downwardly with respect to the lower unit. Even when the upper unit is open to the lower unit, the relative position between the rotating member and the drive source, and the relative position between the rotating member and the driven part in the upper and lower units do not change. For this reason,
The drive source can always be connected to the driven part via the rotating member in a constant positional relationship.

Therefore, it is possible to reliably transmit the rotational driving force in both forward and reverse directions of the drive source of the driven part-2 in the upper and lower units, and it is also possible to start and stop the rotation of the driven part by controlling the drive source. , can be transmitted and stopped without delay.

[Embodiment] FIG. 1 shows a perspective view of the configuration of a driving force transmission structure according to an embodiment of the present invention.

A device 10 to which this driving force transmission structure is applied (for example,
The image recording apparatus (which performs image recording processing by conveying an image recording material using nipping conveyance rollers) is of a so-called Taram shell type in which an upper unit 12 is pivotally connected to a lower unit 14 by a shaft 16 so as to be able to open up and down. The upper unit 12 can be opened and moved in the six directions shown by the arrows.

A motor 18 as a drive source is arranged in the upper unit 12. The rotation shaft 20 of this motor 18 is connected to a roller 22 as a driven part arranged in the upper unit 12.
(nipping conveyance rollers for conveying image recording material) by a plurality of timing pulleys 24 and a timing belt 26 as connecting members. For this reason, roller 2
2 is transmitted with the driving force of the motor 18 and rotates.

Further, the rotating shaft 20 of the motor 18 is connected to a timing pulley 32 as a rotating member by a timing belt 28, 30 as a connecting member. The timing pulley 32 is attached to a shaft 16 that pivotally connects the upper unit 12 to the lower unit 14, and is rotatable relative to this shaft 16. That is, the rotation axis of the timing pulley 32 connected to the motor 18 is arranged to match the axis of opening movement of the upper unit 12 and lower unit 14, and when the motor 18 rotates, the timing pulley 32 rotates the shaft 16. Rotate around the center.

A timing boot IJ 34 as a rotating member is similarly arranged near the timing pulley 32. The timing pulley 34 is formed coaxially and integrally with the timing pulley 32, and therefore can rotate together with the timing pulley 32 relative to the shaft 16. That is, the rotational axis of the timing pulley 34 is also arranged to coincide with the axis of opening movement of the upper unit 12 and lower unit 14, and when the timing pulley 32 is rotated by the motor 18, the timing pulley 34 also rotates. This timing pulley 34 is connected to a plurality of rollers 36 (nipping conveyance rollers for conveying image recording material) as a driven part arranged in the lower unit 14, and a plurality of timing pulleys 38 and a timing belt 4 as a connecting member.
Connected by 0. Therefore, each roller 36 is rotated by being transmitted with driving force by the rotation of the timing pulley 34.

Next, the operation of this embodiment will be explained.

In the driving force transmission structure configured as described above, the rotational driving force of the motor 18 disposed in the upper unit 12 is transmitted to the roller 2 by a plurality of timing pulleys 24 and a timing belt 26.
2 and is transmitted by the timing boolean IJ32.34 to the roller 36 in the lower unit. Therefore, when the rotational direction of the motor 18 is changed, the rotational direction of each roller 22, 36 is also changed accordingly, and the rotation of the motor 18 in both forward and reverse directions can be reliably transmitted.

Kokote, timing pulley as a rotating member 32.34
Since the axis of rotation of is arranged to coincide with the axis 16 connecting the upper unit 12 and the lower unit 14 (i.e., the axis of opening movement), when the upper unit 12 is moved up and down with respect to the lower unit 14, Alternatively, even if the upper unit (12) is open to the lower unit 14, the relative positions of the timing pulley 32, the motor 18, and the rollers 22 in the upper unit 12, and the relative positions of the timing pulley 34 and each roller in the lower unit 14. The relative position with respect to 36 does not change. Therefore, the motor 18 can always be connected to the rollers 22, 36 in the upper and lower units via the timing pulleys 32, 34 in a constant positional relationship.

Therefore, the rotational driving force of the motor 18 in both forward and reverse directions can be reliably transmitted to the rollers 22.36 (driven parts) in the upper unit 12 and the lower unit 14, and the motor 18 can start and stop the rotation of the rollers 22.36. This can be done through control, allowing transmission and stopping without delay. Therefore, other control devices such as clutches and brakes for starting and stopping the rotation of the rollers 22, 36 are not required, and costs can also be reduced.

In this embodiment, a timing belt and a timing pulley are used as the connecting member and the rotating member, but the present invention is not limited to this. For example, a structure may be adopted in which a chain or wire is used as the connecting member, and a gear or pulley corresponding to the chain or wire is used as the rotating member. Further, a configuration may be adopted in which a gear is used as the connecting member and meshes with a gear as a rotating member. Even in these cases, the rotational driving force of the motor (drive source) in both forward and reverse directions can be transmitted and stopped reliably and without delay to the roller (driven part).

[Effects of the Invention] As explained above, the driving force transmission structure according to the present invention transfers the rotational driving force in both the forward and reverse directions of the drive source disposed in either the upper unit or the lower unit into the upper unit or the lower unit. It has the excellent effect of being able to reliably transmit and stop the transmission to the driven part without delay.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the configuration of a driving force transmission structure according to an embodiment of the present invention, and FIGS. 2 and 3 are schematic side views showing the configuration of a conventional driving force transmission structure. 12... Upper unit, 14... Lower unit, 16... Axis, 18... Motor (drive source), 22.36... Roller (driven part), 24.38...
・Timing pulley (connection member), 26.28.30
．． 40...Timing belt (connecting member), 32.34...Timing pulley (rotating member).

Claims (1)

[Claims] (1) Used in a device in which an upper unit is pivotally connected to a lower unit so as to be vertically open and movable, and the rotational driving force of a drive source disposed in either the upper unit or the lower unit is applied to the drive unit. A driving force transmission structure for transmitting a driving force to driven parts in the upper unit and the lower unit by a rotating member connected to a power source via a connecting member, the rotation of the rotating member connected to the driving source. A driving force transmission structure characterized in that an axis is arranged to coincide with an axis of opening movement of the upper unit and the lower unit.