The present application is based on, and claims priority from JP Application Serial Number 2019-137528, filed Jul. 26, 2019 and JP Application Serial Number 2019-212577, filed Nov. 25, 2019, the disclosures of which are hereby incorporated by reference herein in their entirety.

BACKGROUND

1. Technical Field

The present disclosure relates to a recording apparatus including a document reading unit that reads a document and that is provided above a recording unit that performs recording on a medium. In addition, the present disclosure relates to an opening/closing apparatus including an apparatus main body and an opening/closing body that can be opened and closed with respect to the apparatus main body.

2. Related Art

Some recording apparatuses typified by a printer are provided with a scanner unit on an upper portion of an apparatus main body including a recording portion that performs recording on a medium, and are configured as a multi-function machine including both a recording function for recording on a medium and a reading function for reading a document.

JP-A-2018-19341 describes an example of such a configuration. The image reading and recording apparatus described in JP-A-2018-19341 includes an image reading unit above an image recording unit. The image reading unit is attached to the image recording unit so as to pivot via an opening/closing mechanism.

The opening/closing mechanism holds the image reading unit in an open state. The opening/closing mechanism includes a stay having a cam surface and a rotor, and when the rotor rotates, the rotor is hooked on the cam surface, and the open state of the image reading unit is held.

In the configuration described in JP-A-2018-19341, the rotor rotates and is hooked on the cam surface, and when closing the image reading unit in an open state, it is necessary to slightly lift the image reading unit once and then close the image reading unit in order to unhook the rotor, and the operation is difficult to intuitively understand and is troublesome.

As a configuration for avoiding such a problem, as illustrated inFIG. 21, it is conceivable to adopt a configuration in which a shaft102, which is simple, is used in place of the rotor, the cam surface is formed in a simple arc shape, an elastically deformable portion101bis provided on the cam surface, and the cam surface is hooked on the shaft102by the elasticity of the elastically deformable portion101b.

Reference sign101denotes a stay, which is attached to the image reading unit. The shaft102is attached to the image recording unit, and is inserted into a cam groove101aformed on the stay101. A gear portion101cis formed on an outer peripheral portion of the stay, and the gear portion101cmeshes with a gear103. Rotational torque of the gear103is transmitted to a damper mechanism (not illustrated), and the speed at which the image reading unit closes is reduced.

The upper diagram inFIG. 21illustrates a state in which the image reading unit is closed, the lower diagram inFIG. 21illustrates a state in which the image reading unit is open, and the middle diagram inFIG. 21illustrates a state in which the image reading unit is half-open. From the upper diagram inFIG. 21illustrating the state in which the image reading unit is closed, when opening the image reading unit, the stay101rotates together with the image reading unit, and the shaft102relatively moves within the cam groove101a.

The width of the cam groove101abecomes narrower at the position of the elastically deformable portion101b, and when changing from the middle diagram inFIG. 21to the lower diagram, the shaft102deforms the elastically deformable portion101band increases a groove width. In the state illustrated in the lower diagram inFIG. 21, the open state of the image reading unit is held by the elastically deformable portion101bbeing hooked on the shaft102.

With the configuration as illustrated inFIG. 21, as in the image reading and recording apparatus described in JP-A-2018-19341, there is no need to temporarily lift the image reading unit slightly when closing the image reading unit in the open state, and the operation becomes intuitively easy to understand and simple.

However, when opening the image reading unit from the closed state, specifically, in the process of changing from the middle diagram inFIG. 21to the lower diagram, there is a possibility that the shaft102is lifted due to insufficient elastic deformation of the elastically deformable portion101b, that is, the image recording unit is lifted, and the image reading unit cannot be opened properly. Such a problem tends to occur particularly when the image recording unit is reduced in weight.

SUMMARY

According to an aspect of the present disclosure, a recording apparatus includes a recording unit that includes a recording portion that performs recording on a medium, a document reading unit that includes a reader that reads a document and that opens and closes an upper portion of the recording unit by pivoting at an upper portion of the recording unit, and a holder that holds the document reading unit in an open state. The holder includes a shaft provided on one of the recording unit and the document reading unit, and a groove forming member provided on another one of the recording unit and the document reading unit, in the groove forming member, a groove into which the shaft is inserted is formed, and the shaft moves relative to the groove with opening and closing of the document reading unit, in the groove, an elastically deformable portion configured to make a width of the groove narrower than a maximum diameter of the shaft and configured to elastically deform in a direction in which the width of the groove increases, and a holding portion that holds the document reading unit in an open state by holding the shaft by elasticity of the elastically deformable portion are provided, the shaft has a shape whose radial dimension changes along a circumferential direction and is provided so as to rotate, and the recording apparatus includes a rotation regulator that regulates rotation of the shaft such that the radial dimension of the shaft with respect to the width of the groove is equal to or less than a first dimension that is smaller than the maximum diameter when the shaft passes through the elastically deformable portion in a process of opening the document reading unit from a closed state.

