Manual presser foot lifting mechanism of sewing machine

Abstract

The utility model provides a manual presser foot lifting mechanism of a sewing machine, and belongs to the technical field of sewing machines. The manual presser foot lifting mechanism solves the problem that an existing manual presser foot lifting mechanism is poor in stability. According to the manual presser foot lifting mechanism of the sewing machine, the sewing machine comprises a machine shell and a pressing rod arranged in the machine shell in a penetrating mode, the lower end of the pressing rod is connected with a presser foot, the manual presser foot lifting mechanism comprises an ejector block fixedly connected to the pressing rod, a rotating shaft is arranged on the machine shell in a penetrating mode, the outer end of the rotating shaft is connected with a handle, and the inner end of the rotating shaft is connected with a protruding block. The handle rotates to drive the rotating shaft and the protruding block to rotate so that the protruding block can jack up the ejecting block, a sliding groove is formed in the machine shell, and the ejecting block is provided with a sliding part which can be embedded into the sliding groove and move up and down along the sliding groove. According to the manual presser foot lifting mechanism of the sewing machine, the stability of the manual presser foot lifting can be improved while the smoothness of the manual presser foot lifting is not affected.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a manual presser foot lifting mechanism of a sewing machine. Background Art

[0002] During normal sewing, the driving component of a conventional sewing machine drives the presser foot lifter assembly to move the presser foot lifter up and down. However, in a power outage or after a driving component failure, conventional sewing machines do not have a manual presser foot lifter mechanism. Therefore, in order to solve this problem, a structure as shown below has been developed.

[0003] For example, Chinese patent application [Authorization Announcement No.: CN205501597U] discloses a presser foot lifting device of a sewing machine, including a presser foot and a presser rod, one end of the presser rod is connected to the presser foot, and also includes a knee-controlled presser foot lifting mechanism, an electromagnet presser foot lifting mechanism and a manual presser foot lifting mechanism. The knee-controlled presser foot lifting mechanism includes a front crank and a rear crank, one end of the front crank is connected to one end of the rear crank by a connecting rod, and the other end of the rear crank is connected to a push rod. The front crank drives the presser rod to enable the presser foot to achieve a presser foot lifting action. The electromagnet presser foot lifting mechanism includes an electromagnet and a connecting rod, one end of the connecting rod is connected to the presser rod, and the electromagnet drives the connecting rod to enable the presser foot to achieve a presser foot lifting action. The manual presser foot lifting mechanism includes a protrusion that manually drives the presser foot to achieve the presser foot lifting action, a driving rod is provided on the protrusion, and a handle is provided at one end of the driving rod, and the protrusion abuts against the bottom surface of the front crank.

[0004] The above structure drives the protrusion by rotating the handle, and the rotation of the protrusion abuts against the bottom surface of the front crank, and pushes the front crank, the pressure rod and the presser foot to move upward synchronously, thereby realizing manual lifting of the presser foot. Since the front crank is lifted by the protrusion, the surface of the protrusion is an arc surface, and the front crank may shake in the left and right directions during the lifting process, resulting in an unstable lifting process and reducing the stability of the presser foot lifting mechanism. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems in the existing technology and propose a manual presser foot lifting mechanism for a sewing machine. The technical problem to be solved by the utility model is: how to solve the problem of poor stability of the existing manual presser foot lifting mechanism.

[0006] The purpose of this utility model can be achieved through the following technical solutions:

[0007] A manual presser foot lifting mechanism for a sewing machine, the sewing machine includes a casing and a pressure rod passed through the casing, the lower end of the pressure rod is connected to the presser foot, the manual presser foot lifting mechanism includes a top block fixed to the pressure rod, a rotating shaft is passed through the casing, the outer end of the rotating shaft is connected to a handle, the inner end of the rotating shaft is connected to a protrusion, the rotation of the handle drives the rotating shaft and the protrusion to rotate so that the protrusion lifts the top block, and is characterized in that a slide groove is provided on the casing, and the top block has a sliding part that can be embedded in the slide groove and move up and down along the slide groove.

[0008] Working principle: When the presser foot needs to be lifted manually, the handle located outside the casing is turned. The rotation of the handle drives the rotating shaft and the protrusion to rotate synchronously. The protrusion rotates to lift the top block, and the top block slides in the slide groove through the sliding part, so that the top block can only slide upward along the slide groove, thereby achieving stable lifting of the presser foot. When the presser foot needs to be lowered manually, the handle is rotated. The rotating handle drives the rotating shaft and the protrusion to rotate synchronously, the raised position of the protrusion rotates downward, and the sliding part of the top block also slides downward along the slide groove, making the presser foot more stable during the lowering process. Through the setting of the slide groove and the sliding part, the stability of manual presser foot lifting can be improved without affecting the smoothness of manual presser foot lifting.

[0009] By arranging the sliding groove and the sliding portion of the top block, the stability of the top block moving up and down is improved, thereby improving the stability of the manual presser foot lifting mechanism.

[0010] In the manual presser foot lifting mechanism of the sewing machine, the groove walls of the sliding groove are two sliding walls arranged opposite to each other, the sliding portion is in the shape of an elongated strip, and the sliding portion has two guide walls fitted with the sliding walls.

[0011] When the sliding part slides along the sliding groove, the two guide walls of the sliding part slide in contact with the sliding wall, and the stability of the top block moving up and down is improved by limiting the top block in the lateral direction.

[0012] In the manual presser foot lifting mechanism of the above-mentioned sewing machine, a guide block is connected to the casing, the guide block is provided with the above-mentioned slide groove, the slide groove has an opening set downward, and the guide block has a horizontally arranged limit rod, and the limit rod is located below the opening.

[0013] By setting the guide block, there is no need to make major improvements to the original casing. Instead, parts can be directly added to facilitate processing. The setting of the limit rod prevents the top block from moving down the slide groove, thereby improving the stability of the top block sliding up and down.

[0014] In the manual presser foot lifting mechanism of the sewing machine, the protrusion is provided with a baffle, and the baffle can abut against the side wall of the sliding part.

[0015] The setting of the baffle limits the rotation of the handle, avoids the convex block from rotating to the position, and improves the stability of the manual presser foot lifting mechanism.

[0016] In the manual presser foot lifting mechanism of the sewing machine, the driving connecting rod is hinged to the machine shell, and the sewing machine further comprises a driving member capable of driving the driving connecting rod to move up and down.

[0017] By arranging the strip-shaped hole on the driving connecting rod and the pin connected to the top block, the pin on the top block can slide along the strip-shaped hole when the top block moves up and down, which can not only prevent the manual presser foot lifting mechanism from affecting the automatic presser foot lifting mechanism, but also further limit the up and down movement of the top block and improve the stability.

[0018] Compared with the prior art, the manual presser foot lifting mechanism of the sewing machine has the following advantages: when the presser foot needs to be manually lifted, the handle located outside the machine shell is rotated, the rotation of the handle drives the rotation of the shaft and the convex block, the convex block is rotated to lift the top block, the top block is slid in the sliding groove through the sliding part, and the top block can only slide upwards along the sliding groove, so that the presser foot is stably lifted, and the stability of the up and down movement of the top block is improved through the arrangement of the sliding groove and the sliding part of the top block, so that the stability of the manual presser foot lifting mechanism is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the structure schematic diagram of the utility model after assembly.

[0020] Figure 2 is the partial structure schematic diagram of the utility model after assembly.

[0021] Figure 3 is the partial exploded view of the utility model.

[0022] In the figure, 1, machine shell;11, guide block;11a, sliding groove;11b, sliding wall;11c, opening;11d, limiting rod;2, press rod;3, presser foot;4, top block;41, sliding part;42, guide wall;43, pin;5, shaft;6, handle;7, convex block;71, baffle;8, driving connecting rod;81, strip-shaped hole;9, driving member. DETAILED DESCRIPTION

[0023] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0024] For example Figure 1As shown, the manual presser foot lifting mechanism of the sewing machine comprises a machine shell 1 and a presser bar 2 arranged in the machine shell 1, and the lower end of the presser bar 2 is connected with a presser foot 3.

[0025] Specifically, as shown in the drawings, Figures 1-3 As shown, the manual presser foot lifting mechanism comprises a top block 4 fixedly connected with the presser bar 2, a rotating shaft 5 arranged in the machine shell 1, a handle 6 connected with the outer end of the rotating shaft 5, and a protruding block 7 connected with the inner end of the rotating shaft 5, and the rotation of the handle 6 drives the rotating shaft 5 and the protruding block 7 to rotate, so that the protruding block 7 lifts the top block 4, the machine shell 1 is provided with a sliding groove 11a, and the top block 4 is provided with a sliding part 41 capable of being embedded in the sliding groove 11a and moving up and down along the sliding groove 11a.

[0026] Working principle: when the presser foot 3 needs to be manually lifted, the handle 6 located outside the machine shell 1 is rotated, the rotation of the handle 6 drives the rotating shaft 5 and the protruding block 7 to rotate synchronously, the protruding block 7 is rotated to lift the top block 4, and the top block 4 is slid in the sliding groove 11a through the sliding part 41, so that the top block 4 can only slide upwards along the sliding groove 11a, thereby stably lifting the presser foot 3, when the presser foot 3 needs to be manually lowered, the handle 6 is rotated back, the rotated handle 6 drives the rotating shaft 5 and the protruding block 7 to rotate back synchronously, the protruding position of the protruding block 7 is rotated downward, and the sliding part 41 of the top block 4 also slides downward along the sliding groove 11a, so that the presser foot 3 is more stable during the downward movement, through the arrangement of the sliding groove 11a and the sliding part 41, the smoothness of manually lifting the presser foot 3 is not affected, and the stability of manually lifting the presser foot 3 is improved, through the arrangement of the sliding groove 11a and the sliding part 41 of the top block 4, the stability of the upward and downward movement of the top block 4 is improved, thereby improving the stability of the manual presser foot lifting mechanism.

[0027] As shown in the drawings, Figure 3 The groove wall of the sliding groove 11a is two sliding walls 11b arranged opposite to each other, the sliding part 41 is in a strip shape, the sliding part 41 is provided with two guide walls 42 abutting against the sliding walls 11b, the machine shell 1 is connected with a guide block 11, the guide block 11 is provided with the sliding groove 11a, the sliding groove 11a is provided with an opening 11c arranged downward, the guide block 11 is provided with a limiting rod 11d arranged transversely, the limiting rod 11d is located below the opening 11c, the protruding block 7 is provided with a baffle 71 capable of abutting against the side wall of the sliding part 41.

[0028] As shown in the drawings, Figure 1 and Figure 2 The machine shell 1 is hinged with a driving connecting rod 8, and the sewing machine further comprises a driving member 9 capable of driving the driving connecting rod 8 to move up and down, the lower end of the driving connecting rod 8 is provided with a strip-shaped hole 81, and the top block 4 is connected with a bolt 43 capable of being arranged in the strip-shaped hole 81, and the bolt 43 slides up and down along the strip-shaped hole 81 when the top block 4 moves up and down.

[0029] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A manual presser foot lifting mechanism for a sewing machine, the sewing machine comprising a housing (1) and a pressure rod (2) passing through the housing (1), the lower end of the pressure rod (2) being connected to a presser foot (3), the manual presser foot lifting mechanism comprising a top block (4) fixedly connected to the pressure rod (2), a rotating shaft (5) passing through the housing (1), the outer end of the rotating shaft (5) being connected to a handle (6), the inner end of the rotating shaft (5) being connected to a protrusion (7), the rotation of the handle (6) driving the rotating shaft (5) and the protrusion (7) to rotate so that the protrusion (7) lifts the top block (4), characterized in that The housing (1) is provided with a slide groove (11a), and the top block (4) is provided with a sliding portion (41) capable of being embedded in the slide groove (11a) and moving up and down along the slide groove (11a).

2. The manual presser foot lifting mechanism of a sewing machine according to claim 1, characterized in that: The groove wall of the sliding groove (11a) is two sliding walls (11b) arranged opposite to each other. The sliding portion (41) is in a long strip shape. The sliding portion (41) has two guide walls (42) that are in contact with the sliding walls (11b).

3. The manual presser foot lifting mechanism of a sewing machine according to claim 1 or 2, characterized in that: The casing (1) is connected to a guide block (11), the guide block (11) is provided with the above-mentioned slide groove (11a), the slide groove (11a) has an opening (11c) arranged downward, and the guide block (11) has a horizontally arranged limit rod (11d), and the limit rod (11d) is located below the opening (11c).

4. The manual presser foot lifting mechanism of a sewing machine according to claim 1 or 2, characterized in that: The convex block (7) is provided with a baffle (71), and the baffle (71) can abut against the side wall of the sliding portion (41).

5. The manual presser foot lifting mechanism of a sewing machine according to claim 1 or 2, characterized in that: A driving connecting rod (8) is hingedly connected to the casing (1). The sewing machine further comprises a driving member (9) capable of driving the driving connecting rod (8) to move up and down. A strip hole (81) is provided at the lower end of the driving connecting rod (8). A latch (43) capable of being inserted into the strip hole (81) is connected to the top block (4). When the top block (4) moves up and down, the latch (43) slides up and down along the strip hole (81).

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